WO2024012197A1 - Protection switching apparatus and open-circuit protection method - Google Patents

Abstract

Embodiments of the present application provide a protection switching apparatus and an open-circuit protection method. The apparatus comprises a port switch and a coupling light splitter. In a first preset state, the port switch is used for receiving first signal light from a first node device and transmitting the first signal light to the coupling light splitter, the coupling light splitter splits the first signal light into second signal light and third signal light, and the port switch is used for sending the second signal light to a second node device and sending the third signal light to child node devices. In a second preset state, the port switch is used for receiving first signal light from the second node device and transmitting the first signal light to the coupling light splitter, the coupling light splitter splits the first signal light into second signal light and third signal light, and the port switch is used for sending the third signal light to the first node device and sending the second signal light to the child node devices. By using the protection switching apparatus provided in the embodiments of the present application, the cost of the protection switching mechanism for optical fiber links can be reduced, and the applicability thereof can be improved.

Description

A protection switching device and circuit breaking protection method

This application claims priority to the Chinese patent application submitted to the State Intellectual Property Office of China on July 12, 2022, with application number 202210815776.3 and application title "A protection switching device and circuit breaking protection method", the entire content of which is incorporated by reference. in this application.

Technical field

The present application relates to the field of optical communication technology, and in particular to a protection switching device and a circuit break protection method.

Background technique

Traditional metropolitan wavelength division still uses the point-to-point communication architecture of long-distance wavelength division. Multiplexed signals containing multiple wavelengths are sent to leaf nodes through aggregation nodes. Each leaf node downloads or uploads the required wavelength signals through bifurcation multiplexing equipment. This networking method requires high-cost node equipment. The point-to-multipoint metropolitan ring network architecture based on the principle of passive optical network has high system reliability, low networking and maintenance costs, and is expected to solve the contradiction between metropolitan area network system capacity and networking cost. The optical fiber links of the metropolitan area network span a large distance, and the external environment is complex and changeable. Link breaks often occur due to road construction, natural disasters, etc. Therefore, in order to ensure the stability of the business, a An efficient and reliable protection switching mechanism, when a fiber link fails, rapid protection switching can be performed to restore services in the shortest possible time without affecting the user experience.

The existing point-to-multipoint ring network protection switching mechanism for optical fiber links is mainly implemented through 1:1 backup through optical splitters with a fixed split ratio, which is not conducive to the power budget of the entire network and equipment redundancy, resulting in The system cost is higher.

Contents of the invention

The embodiment of the present application discloses a protection switching device and a circuit break protection method. The protection switching device has a simple structure and low cost. The use of the protection switching device can reduce the cost of the protection switching mechanism of optical fiber links and improve its applicability.

The first aspect of the embodiment of the present application discloses a protection switching device, which includes a port switch and a coupling optical splitter. The port switch is connected to the coupling optical splitter. The port switch is respectively connected to a first node device, a second node device and a sub-node device. connected; in the first preset state, the port switch is used to receive the first signal light from the first node device and transmit the first signal light to the coupling optical splitter, and the coupling optical splitter is used to split the first signal light into a third the second signal light and the third signal light, and send the second signal light and the third signal light to the port switch. The port switch is used to send the second signal light to the second node device and send the third signal to the child node device. Light; in the second preset state, the port switch is used to receive the first signal light from the second node device and transmit the first signal light to the coupling optical splitter, and the coupling optical splitter is used to split the first signal light into the third the second signal light and the third signal light, and send the second signal light and the third signal light to the port switch. The port switch is used to send the third signal light to the first node device and send the second signal to the child node device. Light.

It should be understood that in the above protection switching device, the protection switching device can be implemented by a port switch based on a spatial optical path and a passive coupling splitter. The protection switching device has a simple structure and low cost. Using the protection switching device can reduce Reduce the cost of the protection switching mechanism of optical fiber links and improve its applicability. Moreover, in the first preset state, the port switch is used to receive the first signal light from the first node device, and the coupling optical splitter is used to split the first signal light into the second signal light and the third signal light, and the port switch The port switch is used to send the second signal light to the second node device and send the third signal light to the child node device; in the second preset state, the port switch is used to receive the first signal light from the second node device, by coupling The optical splitter splits the first signal light into the second signal light and the third signal light, and the port switch is used to send the second signal light to the sub-node device and the third signal light to the first node device; through the above method, It can be realized that in the second preset state, that is, when the communication link fails, the second node device communicates with the sub-node device on the right side of the broken fiber node, which can ensure the stability of the business, and, in the first In the preset state, the ratio of the third signal light sent to the child node device to the second signal light sent to the second node device is equal to the ratio of the second signal light sent to the child node device in the second preset state to the ratio of the second signal light sent to the child node device in the second preset state. The ratio of the third signal light of the first node device is the reciprocal of each other; that is, it can be understood that in the first preset state, the optical power ratio of the transceiver and light module in the child node device and the backbone fiber is the same as that in the second preset state. Under this condition, the ratio of the optical power of the receiving and receiving optical modules in the sub-node equipment to that of the backbone optical fiber is the reciprocal of each other, which can make the number of connectable sub-node equipment in the optical communication system larger.

In a possible implementation, the port switch includes a first port, a second port, a third port, a fourth port, a fifth port and a sixth port, and the coupling optical splitter includes a seventh port, an eighth port and a sixth port. Nine ports, the fourth port is connected to the seventh port, the fifth port is connected to the eighth port, and the sixth port is connected to the ninth port; in the first default state, the port switch is used to receive data through the first port The first signal light is emitted to the coupling optical splitter through the fourth port, the second signal light is received through the fifth port and the second signal light is emitted to the second node device through the second port, and the second signal light is received through the sixth port. three signal lights and transmit the third signal light to the sub-node device through the third port; in the second preset state, the port switch is used to receive the first signal light through the second port and transmit the third signal light to the coupling splitter through the fourth port. A signal light, receiving the third signal light through the sixth port and transmitting the third signal light to the first node device through the first port, receiving the second signal light through the fifth port and transmitting the second signal light to the child node device through the third port. signal light.

It should be understood that the above protection switching device can realize flexible configuration of the coupler light direction and light splitting ratio in the single-fiber unidirectional point-to-multipoint ring network architecture, that is, the light splitting ratio can be reversed accordingly after the communication direction is changed. It is conducive to the optimization of the ring network link power budget to support the connection of more sub-node devices.

In another possible implementation, the port switch includes an optical path turning lens group; in the second preset state, the optical path turning lens group is used to disconnect the first port and the fourth port and establish the connection between the first port and the fourth port. Connect the sixth port, disconnect the second port from the fifth port and establish the connection between the second port and the fourth port, disconnect the third port from the sixth port and establish the connection between the third port and the fifth port connect.

In another possible implementation, the port switch includes an optical path turning lens group; in the first preset state, the optical path turning lens group is used to establish a connection between the first port and the fourth port, and to establish a connection between the second port and the third port. A five-port connection establishes a connection between the third port and the sixth port.

In another possible implementation, the port switch includes a first port, a second port, a third port, a fourth port, a fifth port, a sixth port and a seventh port, and the coupling optical splitter includes an eighth port, The ninth port, the tenth port and the eleventh port, the fourth port is connected to the eighth port, the fifth port is connected to the ninth port, the sixth port is connected to the tenth port, the seventh port is connected to the eleventh port The ports are connected; in the first preset state, the port switch is used to receive the first signal light through the first port and transmit the first signal light to the coupling splitter through the fourth port, and to receive the second signal light through the fifth port and The second signal light is emitted to the second node device through the second port, the third signal light is received through the sixth port, and the third signal light is emitted to the sub-node device through the third port; in the second preset state, the port switch uses receiving the first signal light through the second port and transmitting the first signal light to the coupling splitter through the sixth port, receiving the third signal light through the fourth port and transmitting the third signal light to the first node device through the first port, Receive the second signal light through the seventh port and transmit the second signal light to the sub-node device through the third port.

It should be understood that the above protection switching device can realize flexible configuration of the coupler light direction and light splitting ratio in the single-fiber unidirectional point-to-multipoint ring network architecture, that is, the light splitting ratio can be reversed accordingly after the communication direction is changed. It is conducive to the optimization of the ring network link power budget to support the connection of more sub-node devices.

In another possible implementation, the port switch includes an optical path turning lens group; in the second preset state, the light path turning lens group is used to disconnect the second port from the fifth port and establish the connection between the second port and the fifth port. Connect the sixth port, disconnect the third port from the sixth port and establish the connection between the third port and the seventh port.

In another possible implementation, the port switch includes an optical path turning lens group; in the first preset state, the optical path turning lens group is used to establish a connection between the first port and the fourth port, and to establish a connection between the second port and the third port. A five-port connection establishes a connection between the third port and the sixth port.

In yet another possible implementation, the port switch includes a first port, a second port, a third port, a fourth port, a fifth port, a sixth port, a seventh port and an eighth port, and the coupling optical splitter includes The ninth port, the tenth port, the eleventh port and the twelfth port, the fifth port is connected to the ninth port, the sixth port is connected to the tenth port, the seventh port is connected to the eleventh port, and the seventh port is connected to the eleventh port. The eight ports are connected to the twelfth port; in the first preset state, the port switch is used to receive the first signal light through the first port and transmit the first signal light to the coupling splitter through the fifth port, and through the sixth port Receive the second signal light and transmit the second signal light to the second node device through the second port, receive the third signal light through the seventh port and transmit the third signal light to the child node device through the third port; in the second preset In this state, the port switch is configured to receive the first signal light through the second port and transmit the first signal light to the coupling optical splitter through the seventh port, and to receive the third signal light through the fifth port and to the first node device through the first port. The third signal light is emitted, the second signal light is received through the eighth port, and the second signal light is transmitted to the sub-node device through the fourth port.

It should be understood that the above protection switching device can realize flexible configuration of the coupler light direction and light splitting ratio in the single-fiber unidirectional point-to-multipoint ring network architecture, that is, the light splitting ratio can be reversed accordingly after the communication direction is changed. It is conducive to the optimization of the ring network link power budget to support the connection of more sub-node devices.

In yet another possible implementation, the port switch includes an optical path turning lens set or an optical switch; in the second preset state, the light path turning lens set or optical switch is used to disconnect the second port from the sixth port. and disconnecting the third port from the seventh port and establishing a connection from the second port to the seventh port.

In another possible implementation, the port switch includes an optical path turning lens set or an optical switch; in the first preset state, the light path turning lens set or optical switch is used to establish a connection between the first port and the fifth port, The connection between the second port and the sixth port is established, and the connection between the third port and the seventh port is established.

In yet another possible implementation, in the first preset state, there is an optical connection between the sub-node device and the first node device; 2. In the default state, there is no optical connection between the child node device and the first node device.

In yet another possible implementation, the sub-node device includes a first light-receiving module and a second light-receiving module; in the first preset state, there is an optical connection between the first light-receiving module and the first node device, and There is no optical connection with the second node device; there is no optical connection between the second light-receiving module and the first node device; in the second preset state, there is no optical connection between the first light-receiving module and the first node device. There is an optical connection and there is no optical connection with the second node device; there is no optical connection between the second receiving and receiving light module and the first node device but there is an optical connection with the second node device.

The second aspect of the embodiment of the present application discloses a protection switching device, which includes a port switch and a coupling optical splitter. The port switch is connected to the coupling optical splitter. The port switch is respectively connected to the first node device, the second node device and the sub-node. The devices are connected, and the sub-node device includes a first light-receiving module and a second light-receiving module; the port switch is used to receive the first signal light from the first node device and transmit the first signal light to the coupling optical splitter. The coupling optical splitter is used to splitting the first signal light into a second signal light and a third signal light, and sending the second signal light and the third signal light to the port switch, and the port switch is used to send the second signal light to the second node device, and sends the third signal light to the first receiving and receiving light module in the child node device; the port switch is used to receive the fourth signal light from the second node device, and transmit the fourth signal light to the coupling optical splitter, and the coupling optical splitter is used to The fourth signal light is split into a fifth signal light and a sixth signal light, and the fifth signal light and the sixth signal light are sent to the port switch. The port switch is used to send the sixth signal light to the first node device and to The second light-receiving module in the child node device sends the fifth signal light, wherein the optical power ratio of the second signal light and the third signal light is a first ratio, and the optical power ratio of the sixth signal light and the fifth signal light is a third ratio. Two ratios, the first ratio and the second ratio are reciprocals of each other.

It should be understood that in the above protection switching device, the protection switching device can be implemented by a port switch based on a spatial optical path and a passive coupling splitter. The protection switching device has a simple structure and low cost. Using the protection switching device can reduce Reduce the cost of the protection switching mechanism of optical fiber links and improve its applicability. Furthermore, the port switch is used to receive the first signal light from the first node device, the coupling optical splitter is used to split the first signal light into the second signal light and the third signal light, and the port switch is used to provide the second signal light to the second node device. Send the second signal light, and send the third signal light to the first receiving and receiving light module in the child node device; the port switch is used to receive the fourth signal light from the second node device, and the coupling splitter is used to split the fourth signal light into the fifth signal light and the sixth signal light, and the port switch is used to send the fifth signal light to the second receiving and transmitting light module in the child node device, and to send the sixth signal light to the first node device; through the above method, it can be realized In the event of a communication link failure, the second node device communicates with the sub-node device on the right side of the fiber-broken node to ensure the stability of the business. Moreover, the second node device is sent to the first transceiver module in the sub-node device. The ratio of the third signal light to the second signal light sent to the second node device is equal to the ratio of the fifth signal light sent to the second transceiver light module in the child node device to the sixth signal light sent to the first node device. Reciprocal; that is, it can be understood as the reciprocal of the ratio of the optical power of the first receiving and transmitting module in the sub-node device to the backbone fiber and the optical power of the second receiving and transmitting module in the sub-node device to the backbone fiber, which enables optical communication. The number of sub-node devices that can be connected in the system is greater.

In a possible implementation, the port switch includes a first port, a second port, a third port, a fourth port, a fifth port, a sixth port, a seventh port and an eighth port, and the coupling optical splitter includes a third port. The ninth port, the tenth port, the eleventh port and the twelfth port, the fifth port is connected to the ninth port, the sixth port is connected to the tenth port, the seventh port is connected to the eleventh port, the eighth port The port is connected to the twelfth port; the port switch is used to receive the first signal light through the first port and transmit the first signal light to the coupling splitter through the fifth port, and to receive the second signal light through the sixth port and pass the second signal light through the second port. The port transmits the second signal light to the second node device, receives the third signal light through the seventh port, and transmits the third signal light to the first receiving and receiving light module in the sub-node device through the third port; the port switch is used to pass the second port Receive the fourth signal light and transmit the fourth signal light to the coupling splitter through the seventh port, receive the sixth signal light through the fifth port and transmit the sixth signal light to the first node device through the first port, and receive through the eighth port The fifth signal light is emitted to the second receiving and receiving light module in the child node device through the fourth port.

In yet another possible implementation, the port switch includes a first optical path turning lens group; the first optical path turning lens group is used to establish a connection between the second port and the sixth port to facilitate the transmission of the second signal light, and to establish The connection between the third port and the seventh port is to facilitate the transmission of the third signal light; the first optical path turning lens group is also used to establish the connection between the second port and the seventh port to facilitate the transmission of the fourth signal light.

In yet another possible implementation, the port switch is configured to receive the first signal light through the first port and transmit the first signal light to the coupling optical splitter through the fifth port, receive the second signal light through the sixth port and transmit the second signal light through the fifth port. The two ports transmit the second signal light to the second node device, receive the third signal light through the seventh port, and transmit the third signal light to the first receiving and receiving light module in the sub-node device through the third port; the port switch is used to pass the first The port receives the fourth signal light and transmits the fourth signal light to the coupling optical splitter through the fifth port, receives the fifth signal light through the sixth port and transmits the fifth signal light to the second node device through the second port, and passes the seventh port Receive the sixth signal light and transmit the sixth signal light to the second receiving and receiving light module in the sub-node device through the fourth port.

In yet another possible implementation, the port switch includes a second optical path turning lens group; the second optical path turning lens group is used to disconnect the fourth signal light at the second port and the seventh port and establish the fifth signal The light is connected to the second port and the sixth port, and the fifth signal light is disconnected The connection between the fourth port and the eighth port is established and the connection of the sixth signal light between the fourth port and the seventh port is established.

In yet another possible implementation, the port switch is configured to receive the first signal light through the second port and transmit the first signal light to the coupling optical splitter through the sixth port, receive the second signal light through the eighth port and transmit the first signal light through the eighth port. One port transmits the second signal light to the first node device, receives the third signal light through the fifth port, and transmits the third signal light to the first receiving and receiving light module in the sub-node device through the third port; the port switch is used to pass the second signal light through the second port. The port receives the fourth signal light and transmits the fourth signal light to the coupling optical splitter through the seventh port, receives the fifth signal light through the fifth port and transmits the fifth signal light to the first node device through the first port, and passes the eighth port Receive the sixth signal light and transmit the sixth signal light to the second receiving and receiving light module in the sub-node device through the fourth port.

In yet another possible implementation, the port switch includes a third optical path turning lens group; the third optical path turning lens group is used to disconnect the first signal light at the first port and the fifth port, and establish the second The connection of the signal light at the first port and the eighth port is used to disconnect the third signal light at the third port and the seventh port, and to establish the connection between the third signal light at the third port and the fifth port.

The third aspect of the embodiment of the present application discloses a circuit break protection method. The circuit break protection method is suitable for an optical communication system. The optical communication system includes a port switch, a coupling splitter, a first node device, a second node device and a sub-node device. The method The method includes: determining that the optical communication system is in a first preset state; receiving the first signal light from the first node device through the port switch, and transmitting the first signal light to the coupling optical splitter; and transmitting the first signal light through the coupling optical splitter. Split the light into a second signal light and a third signal light, and send the second signal light and the third signal light to the port switch; send the second signal light to the second node device through the port switch, and send it to the sub-node device. The third signal light; determines that the optical communication system is in the second preset state; receives the first signal light from the second node device through the port switch, and transmits the first signal light to the coupling optical splitter; transmits the third signal light through the coupling optical splitter A signal light is split into a second signal light and a third signal light, and the second signal light and the third signal light are sent to the port switch; the third signal light is sent to the first node device through the port switch, and to the sub-switch. The node device sends the second signal light.

In a possible implementation, the port switch includes a first port, a second port, a third port, a fourth port, a fifth port and a sixth port, and the coupling optical splitter includes a seventh port, an eighth port and a sixth port. Nine ports; the fourth port is connected to the seventh port, the fifth port is connected to the eighth port, and the sixth port is connected to the ninth port.

In yet another possible implementation, the method includes: when determining that the optical communication system is in the first preset state, receiving the first signal light through the first port in the port switch and coupling the light through the fourth port. The device emits the first signal light, receives the second signal light through the fifth port and transmits the second signal light to the second node device through the second port, receives the third signal light through the sixth port and transmits the third signal light to the child node device through the third port. Emitting the third signal light; when it is determined that the optical communication system is in the second preset state, receiving the first signal light through the second port in the port switch and transmitting the first signal light to the coupling optical splitter through the fourth port. The six ports receive the third signal light and transmit the third signal light to the first node device through the first port, and receive the second signal light through the fifth port and transmit the second signal light to the child node device through the third port.

In yet another possible implementation, the port switch includes an optical path turning lens group; when it is determined that the optical communication system is in the second preset state, the connection between the first port and the fourth port is disconnected and established through the optical path turning lens group. The connection between the first port and the sixth port, the connection between the second port and the fifth port is disconnected and the connection between the second port and the fourth port is established, the connection between the third port and the sixth port is disconnected and the connection between the third port and the fourth port is established. Fifth port connection.

In another possible implementation, the port switch includes an optical path turning lens group; when it is determined that the optical communication system is in the first preset state, a connection between the first port and the fourth port is established through the optical path turning lens group, and a third port is established. The connection between the second port and the fifth port establishes the connection between the third port and the sixth port.

In yet another possible implementation, the port switch includes a first port, a second port, a third port, a fourth port, a fifth port, a sixth port and a seventh port, and the coupling optical splitter includes an eighth port, The ninth port, the tenth port and the eleventh port; the fourth port is connected to the eighth port, the fifth port is connected to the ninth port, the sixth port is connected to the tenth port, the seventh port is connected to the eleventh port port is connected.

In yet another possible implementation, the method further includes: when determining that the optical communication system is in the first preset state, receiving the first signal light through the first port in the port switch and coupling it to the port through the fourth port. The optical splitter emits the first signal light, receives the second signal light through the fifth port and transmits the second signal light to the second node device through the second port, receives the third signal light through the sixth port and transmits the third signal light to the sub-node through the third port. The device emits the third signal light; when it is determined that the optical communication system is in the second preset state, the first signal light is received through the second port in the port switch and the first signal light is emitted to the coupling splitter through the sixth port. The fourth port receives the third signal light and transmits the third signal light to the first node device through the first port, and the seventh port receives the second signal light and transmits the second signal light to the child node device through the third port.

In yet another possible implementation, the port switch includes an optical path turning lens group; when it is determined that the optical communication system is in the second preset state, the connection between the second port and the fifth port is disconnected and established through the optical path turning lens group. The connection between the second port and the sixth port is disconnected, and the connection between the third port and the sixth port is disconnected and the connection between the third port and the seventh port is established.

In another possible implementation, the port switch includes an optical path turning lens group; when it is determined that the optical communication system is in the first preset state, a connection between the first port and the fourth port is established through the optical path turning lens group, and a third port is established. The connection between the second port and the fifth port establishes the connection between the third port and the sixth port.

In yet another possible implementation, the port switch includes a first port, a second port, a third port, a fourth port, a fifth port, a sixth port, a seventh port and an eighth port, and the coupling optical splitter includes The ninth port, the tenth port, the eleventh port and the twelfth port; the fifth port is connected to the ninth port, the sixth port is connected to the tenth port, the seventh port is connected to the eleventh port, and the seventh port is connected to the eleventh port. Port eight is connected to port twelve.

In yet another possible implementation, the method includes: when determining that the optical communication system is in the first preset state, receiving the first signal light through the first port in the port switch and coupling and splitting the light through the fifth port. The device emits the first signal light, receives the second signal light through the sixth port and transmits the second signal light to the second node device through the second port, receives the third signal light through the seventh port and transmits the third signal light to the sub-node device through the third port. Emitting the third signal light; when it is determined that the optical communication system is in the second preset state, receiving the first signal light through the second port in the port switch and transmitting the first signal light to the coupling optical splitter through the seventh port. The five-port receives the third signal light and transmits the third signal light to the first node device through the first port, and receives the second signal light through the eighth port and transmits the second signal light to the sub-node device through the fourth port.

In yet another possible implementation, the port switch includes an optical path turning lens group or an optical switch; when it is determined that the optical communication system is in the second preset state, the second port is disconnected from the second port through the optical path turning lens group or the optical switch. Connect the six ports and disconnect the third port and the seventh port and establish the connection between the second port and the seventh port.

In another possible implementation, the port switch includes an optical path turning lens group or an optical switch; when it is determined that the optical communication system is in the first preset state, the first port and the fifth port are established through the optical path turning lens group or the optical switch. The port connection establishes the connection between the second port and the sixth port, and establishes the connection between the third port and the seventh port.

In yet another possible implementation, when it is determined that the optical communication system is in the first preset state, there is an optical connection between the sub-node device and the first node device; when it is determined that the optical communication system is in the second preset state, There is no optical connection between the child node device and the first node device.

In yet another possible implementation, the child node device includes a first light-receiving module and a second light-receiving module; when it is determined that the optical communication system is in the first preset state, the first light-receiving module and the first node device There is an optical connection between the second node device and the second node device; there is no optical connection between the second transceiver module and the first node device; when it is determined that the optical communication system is in the second preset state, the first transceiver module There is no optical connection between the optical module and the first node device and no optical connection with the second node device; there is no optical connection between the second receiving and receiving optical module and the first node device and there is no optical connection with the second node device. An optical connection exists.

In yet another possible implementation, determining that the optical communication system is in the first preset state includes: the controller in the optical communication system detects that the communication link has not failed; determining that the optical communication system is in the second preset state includes: : A controller in an optical communication system detects a communication link failure.

The fourth aspect of the embodiment of the present application discloses a circuit break protection method. The circuit break protection method is suitable for an optical communication system. The optical communication system includes a port switch, a coupling splitter, a first node device, a second node device and a sub-node device. The sub-node device The node device includes a first light-receiving module and a second light-receiving module. The method includes: receiving the first signal light from the first node device through the port switch, and transmitting the first signal light to the coupling optical splitter; Split the first signal light into the second signal light and the third signal light, and send the second signal light and the third signal light to the port switch; send the second signal light to the second node device through the port switch, and Send the third signal light to the first receiving and receiving light module in the child node device; receive the fourth signal light from the second node device through the port switch, and transmit the fourth signal light to the coupling optical splitter; use the coupling optical splitter to transmit the third signal light The four-signal light is split into a fifth signal light and a sixth signal light, and the fifth signal light and the sixth signal light are sent to the port switch; the port switch is used to send the sixth signal light to the first node device, and to The second light-receiving module in the child node device sends the fifth signal light, wherein the optical power ratio of the second signal light and the third signal light is a first ratio, and the optical power ratio of the sixth signal light and the fifth signal light is a third ratio. Two ratios, the first ratio and the second ratio are reciprocals of each other.

In a possible implementation, the port switch includes a first port, a second port, a third port, a fourth port, a fifth port, a sixth port, a seventh port and an eighth port, and the coupling optical splitter includes a third port. Nine ports, tenth ports, eleventh ports and twelfth ports; the fifth port is connected to the ninth port, the sixth port is connected to the tenth port, the seventh port is connected to the eleventh port, the eighth port The port is connected to port 12.

In yet another possible implementation, the method includes: receiving the first signal light through the first port in the port switch, transmitting the first signal light to the coupling optical splitter through the fifth port, and receiving the first signal light through the sixth port. two signal lights and transmitting the second signal light to the second node device through the second port, receiving the third signal light through the seventh port and transmitting the third signal light to the first receiving and receiving light module in the child node device through the third port; by The second port in the port switch receives the fourth signal light and transmits the fourth signal light to the coupling optical splitter through the seventh port. The five ports receive the sixth signal light and transmit the sixth signal light to the first node device through the first port, receive the fifth signal light through the eighth port and transmit the fifth signal light to the second receiving and receiving light module in the child node device through the fourth port. signal light.

In yet another possible implementation, the port switch includes a first optical path turning lens group; establishing a connection between the second port and the sixth port through the first optical path turning lens group to facilitate transmission of the second signal light, and establishing a third optical path turning lens group. The connection between the third port and the seventh port is to facilitate the transmission of the third signal light; the connection between the second port and the seventh port is established through the first optical path turning lens group to facilitate the transmission of the fourth signal light.

In yet another possible implementation, the method includes: receiving the first signal light through the first port in the port switch, transmitting the first signal light to the coupling optical splitter through the fifth port, and receiving the first signal light through the sixth port. two signal lights and transmitting the second signal light to the second node device through the second port, receiving the third signal light through the seventh port and transmitting the third signal light to the first receiving and receiving light module in the child node device through the third port; by The first port in the port switch receives the fourth signal light and transmits the fourth signal light to the coupling optical splitter through the fifth port, receives the fifth signal light through the sixth port and transmits the fifth signal light to the second node device through the second port. The signal light receives the sixth signal light through the seventh port and transmits the sixth signal light to the second receiving and receiving light module in the sub-node device through the fourth port.

In yet another possible implementation, the port switch includes a second optical path turning lens group; the connection between the fourth signal light at the second port and the seventh port is disconnected through the second optical path turning lens group and the fifth signal light is established. At the connection between the second port and the sixth port, the connection between the fifth signal light at the fourth port and the eighth port is disconnected and the connection between the sixth signal light at the fourth port and the seventh port is established.

In yet another possible implementation, the method includes: receiving the first signal light through the second port in the port switch, transmitting the first signal light to the coupling optical splitter through the sixth port, and receiving the first signal light through the eighth port. two signal lights and transmitting the second signal light to the first node device through the first port, receiving the third signal light through the fifth port and transmitting the third signal light to the first receiving and receiving light module in the child node device through the third port; by The second port in the port switch receives the fourth signal light and transmits the fourth signal light to the coupling optical splitter through the seventh port, receives the fifth signal light through the fifth port and transmits the fifth signal light to the first node device through the first port. The signal light receives the sixth signal light through the eighth port and transmits the sixth signal light to the second receiving and receiving light module in the sub-node device through the fourth port.

In yet another possible implementation, the port switch includes a third optical path turning lens group; the third optical path turning lens group disconnects the first signal light at the first port and the fifth port, and establishes the second signal The light is connected between the first port and the eighth port, the connection between the third signal light at the third port and the seventh port is disconnected, and the connection between the third signal light at the third port and the fifth port is established.

In the circuit break protection method provided by the embodiments of the present application, the protection switching device can be implemented by a port switch based on a spatial optical path and a passive coupling splitter. The protection switching process can be achieved by mechanically moving spatial optical elements. Related technologies It is relatively mature, has small spatial optical path insertion loss and high extinction ratio, and can achieve fast and low-cost protection switching.

In summary, the optical communication system and circuit break protection method provided by this application may be able to ensure the stability of the business, and are simple to implement and low in cost.

Description of drawings

The drawings used in the embodiments of this application are introduced below.

Figure 1 is a first structural schematic diagram of an optical communication system provided by an embodiment of the present application;

Figure 2 is a schematic diagram of a protection switching device provided by an embodiment of the present application;

Figure 3A is a schematic diagram of a specific structure of a protection switching device provided by an embodiment of the present application;

Figure 3B and Figure 3C are schematic diagrams of the connection relationship between ports in a port switch provided by an embodiment of the present application;

Figures 4 and 5 are schematic diagrams of optical path connections provided by embodiments of the present application;

Figure 6A is a schematic diagram of another specific structure of a protection switching device provided by an embodiment of the present application;

Figures 6B to 6E are schematic diagrams of connection relationships between ports in yet another port switch provided by an embodiment of the present application;

Figures 7 and 8 are schematic diagrams of yet another optical path connection provided by embodiments of the present application;

Figure 9A is a second structural schematic diagram of an optical communication system provided by an embodiment of the present application;

Figure 9B and Figure 9C are schematic diagrams of yet another signal optical transmission provided by embodiments of the present application;

Figure 10A is a schematic diagram of another specific structure of a protection switching device provided by an embodiment of the present application;

Figures 10B to 10F are schematic diagrams of the connection relationship between ports in yet another port switch provided by an embodiment of the present application;

Figures 11-13 are schematic diagrams of yet another optical path connection provided by embodiments of the present application;

Figure 14A is a third structural schematic diagram of an optical communication system provided by an embodiment of the present application;

Figure 14B and Figure 14C are schematic diagrams of another signal optical transmission provided by the embodiment of the present application;

Figure 15A is a schematic diagram of another specific structure of a protection switching device provided by an embodiment of the present application;

Figures 15B to 15F are schematic diagrams of the connection relationship between ports in another port switch provided by an embodiment of the present application;

Figures 16-18 are schematic diagrams of yet another optical path connection provided by embodiments of the present application;

Figure 19A is a fourth structural schematic diagram of an optical communication system provided by an embodiment of the present application;

Figure 19B and Figure 19C are schematic diagrams of another signal optical transmission provided by the embodiment of the present application;

Figure 20A is a schematic diagram of another specific structure of a protection switching device provided by an embodiment of the present application;

Figures 20B to 20G are schematic diagrams of the connection relationship between ports in another port switch provided by an embodiment of the present application;

Figure 21 is a schematic diagram of another optical path connection provided by an embodiment of the present application;

Figure 22 is a flow chart of a circuit break protection method provided by an embodiment of the present application;

Figure 23 is a flow chart of yet another circuit break protection method provided by an embodiment of the present application.

Detailed ways

The embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

The optical fiber links of the metropolitan area network span a large distance and the external environment is complex and changeable. Link fiber breaks often occur due to road construction, natural disasters and other reasons. Therefore, in order to ensure the stability of the business, a An efficient and reliable protection switching mechanism. When a fiber link fails, rapid protection switching can be performed to restore services in the shortest possible time without affecting the user experience. Currently, optical branches with a fixed split ratio can be used to restore services. The router performs 1:1 backup to implement protection switching, but this is not conducive to the power budget of the entire network and equipment redundancy, resulting in high system costs.

Therefore, the technical problem to be solved by this application is to propose a protection switching device with a simple structure and low cost. Using this protection switching device can reduce the cost of the protection switching mechanism of the optical fiber link and improve its applicability.

Example 1:

Please refer to Figure 1. Figure 1 is a first structural schematic diagram of an optical communication system 100 provided by an embodiment of the present application. As shown in Figure 1, the optical communication system 100 includes a first node device 10, a second node device 20, Child node device 301, child node device 302, child node device 303, child node device 30N and optical fiber 40; wherein, the first node device 10, child node device 301, child node device 302, child node device 303, child node device 30N , the second node devices 20 are connected to the ring network through optical fibers 40. Among them, each sub-node device includes a transceiver and light module. The first node device 10 and the second node device 20 may be optical line terminal (OLT) devices, and the sub-node devices 301, 302, 303 and 30N may be optical network units ( optical network unit (ONU). It should be noted that, under the structure shown in Figure 1, in the first preset state, there is an optical connection between each sub-node device and the first node device 10; in the second preset state, at least one sub-node device There is no optical connection between the node device and the first node device 10 . For example, in the first preset state, there are optical connections between the child node device 301, the child node device 302, the child node device 303, and the child node device 30N and the first node device 10. For example, in the second preset state, if the optical fiber between the sub-node device 301 and the sub-node device 302 is broken, then the connections between the sub-node device 302, the sub-node device 303, the sub-node device 30N and the first node device 10 There is no optical connection. It should be understood that the so-called first preset state is a state in which the communication link is normal, and the second preset state is a state in which the communication link fails. Among them, a protection switching device can be deployed in each sub-node device. It should be noted that the protection switching device can be deployed in the sub-node device or independently deployed in the optical communication system. The embodiments of this application are not limited. The use of this protection switching device can ensure the stability of communication services in the second preset state, and the protection switching device includes a port switch and a coupling splitter, which can reduce the cost of the protection switching mechanism of the optical fiber link and improve its applicability .

The above describes the architecture of the optical communication system 100. Next, the specific structure of the protection switching device will be described.

Under the structure of an optical communication system 100 shown in Figure 1, as shown in Figure 2, Figure 2 is a schematic diagram of a protection switching device 50 provided by an embodiment of the present application. The protection switching device 50 is in each sub-node device. The functions played are the same. For description, the protection switching device 50 is deployed in the sub-node device 301 as an example. The protection switching device 50 includes a port switch 501 and a coupling splitter 502. The port switch 501 is connected to the first The node device 10 is connected to the sub-node device 301, and the port switch 501 is connected to a backbone optical fiber that leads to the second node device 20.

In specific implementation, in the first preset state, the port switch 501 is used to receive the first signal light from the first node device 10 and transmit the first signal light to the coupling optical splitter 502 . The coupling splitter 502 is used to split the first signal light into the second signal light and the third signal light, and send the second signal light and the third signal light to the port switch 501 . The port switch 501 is configured to send the second signal light to the second node device 20 and send the third signal light to the child node device. It should be noted that the port switch 501 sending the third signal light to the child node device may mean that the port switch 501 sends the third signal light to the transceiver light module in the child node device.

In the second preset state, the port switch 501 is configured to receive the first signal light from the second node device 20 and transmit the first signal light to the coupling splitter 502 . The coupling splitter 502 is used to split the first signal light into the second signal light and the third signal light, and send the second signal light and the third signal light to the port switch 501 . The port switch 501 is used to send the third signal light to the first node device 10, and to The child node device sends the second signal light. It should be noted that the port switch 501 sending the second signal light to the child node device may mean that the port switch 501 sends the second signal light to the transceiver light module in the child node device.

It should be noted that the first node device 10 and the second node device 20 can serve as master and backup for each other. That is to say, the first node device 10 and the sub-node devices construct a main path for optical signal transmission, while the second node device 20 and the sub-node devices construct a backup path for optical signal transmission. In actual use, the optical communication system 100 will preferentially use the main path for signal light transmission.

It should be noted that in the first preset state, the splitting ratio of the second signal light and the third signal light sent by the port switch 501 is the first ratio, for example, 9:1. In the second preset state, the splitting ratio of the third signal light and the second signal light sent by the port switch 501 is a second ratio, for example, 1:9, where the first ratio and the second ratio are reciprocals of each other.

By way of example, a protection switching device 50 is deployed in each sub-node device. During downlink communication, in the first preset state, the first node device 10 sends the first signal light with the central wavelength λ1 to the child node device 301, and the child node device 301 receives the first signal light through the port switch 501, and transmitted to the coupling splitter 502, which splits the first signal light into the second signal light and the third signal light, and sends the second signal light and the third signal light to the port switch 501, which switches The transmitter 501 is used to send the second signal light to the child node device 302, and to send the third signal light to the transceiver and light module in the child node device 301. The child node device 302 receives the second signal light through the port switch 501 and transmits it to the coupling optical splitter 502. The coupling optical splitter 502 splits the second signal light into a fourth signal light and a fifth signal light, and converts the fourth signal light into a fourth signal light and a fifth signal light. The light and the fifth signal light are sent to the port switch 501, which is used to send the fourth signal light to the child node device 303, and to send the fifth signal light to the transceiver light module in the child node device 302. By analogy, the fourth signal light is transmitted from the sub-node device 303 to the sub-node device 30N. At each sub-node device, a part of the signal power is split through a coupling splitter to the receiving and transmitting light module of the sub-node device to complete the downlink communication, and the remaining The lower signal power continues to be transmitted to the next child node device. Among them, the ratio of the power of the fifth signal light and the fourth signal light increases sequentially compared with the ratio of the power of the third signal light and the second signal light. It should be noted that from the child node device 301 to the child node device 302 until the direction of the sub-node device 30N, the ratio of the power of the optical signal in the light-transmitting module in the sub-node device to the power of the optical signal in the trunk fiber gradually increases. For example, the power of the optical signal in the light-receiving module in the sub-node device 301 The ratio of the power to the power of the optical signal of the backbone fiber is 1:9; the ratio of the power of the optical signal in the light-receiving module in the sub-node device 302 to the power of the optical signal of the backbone fiber is 2:8; in the sub-node device 303 The ratio of the power of the optical signal in the light-receiving module to the power of the optical signal in the backbone fiber is 3:7. By analogy, the power of the optical signal in the light-receiving module in the sub-node device 30N is equal to the power of the optical signal in the backbone fiber. The ratio is 9:1.

In the second preset state, for example, if the optical fiber between the sub-node device 301 and the sub-node device 302 is broken, the communication service between the first node device 10 and the sub-node device 302 is interrupted. At this time, the second The node device 20 starts to work. The second node device 20 sends the first signal light with the center wavelength λ1 to the child node device 30N. The child node device 30N receives the first signal light through the port switch 501 and transmits it to the coupling splitter 502. The coupling splitter 502 splits the first signal light into the second signal light and the third signal light, and sends the second signal light and the third signal light to the port switch 501 in the sub-node device 30N. The port switch 501 is used to send the second signal light to the child node device 30 (N-1), and send the third signal light to the transceiver and light module in the child node device 30N. The sub-node device 30 (N-1) receives the second signal light through the port switch 501 and transmits it to the coupling splitter 502, which splits the second signal light into the fourth signal light and the fifth signal light, and sends the fourth signal light and the fifth signal light to the port switch 501 in the child node device 30 (N-1), which is used to send the fourth signal to the child node device 30 (N-2). light, and sends the fifth signal light to the transceiver light module in the child node device 30(N-1). By analogy, the fourth signal light is transmitted from the sub-node device 30 (N-2) to the sub-node device 302. At each sub-node device, a part of the signal power is split through a coupling splitter to the receiving and transmitting light module of the sub-node device. Downlink communication, while the remaining signal power continues to be transmitted to the next child node device. Among them, the ratio of the power of the fifth signal light and the fourth signal light increases sequentially compared with the ratio of the power of the third signal light and the second signal light. It should be noted that from the sub-node device 30N to the sub-node device 30(N-1) until the child node device 303 to the child node device 302, the ratio of the power of the optical signal in the receiving and receiving light module in the child node device to the power of the optical signal of the backbone fiber gradually increases, for example, the child node device 30N The ratio of the power of the optical signal in the middle receiving and receiving light module to the power of the optical signal in the backbone optical fiber is 1:9; the power of the optical signal in the receiving and receiving light module in the sub-node device 30 (N-1) and the optical signal in the backbone optical fiber The power ratio of The ratio of the power of the optical signal in the optical fiber to the power of the optical signal in the backbone fiber is 8:2. It should be noted that in the second preset state, the first node device 10 can still send the first signal light with a central wavelength of λ ₁ to the child node device 301, and the child node device 301 receives the first signal light through the port switch 501. The signal light is transmitted to the coupling splitter 502, which splits a part of the signal power to the receiving and transmitting light module of the sub-node device to complete downlink communication.

The situation of downlink communication has been described above. The situation of uplink communication is as follows: in the first preset state, the port switch 501 is used to receive the second signal light and the third signal light from the sub-node device, and convert the second signal light into and the third signal light are sent to the coupling splitter 502. The coupling splitter 502 couples the second signal light and the third signal light into the first signal light, and transmits the first signal light to the port switch 501. The port switch 501 used to optically transmit the first signal to the first node device 10; in the second preset state, the port switch 501 is used to receive the third signal light and the second signal light from the sub-node device, and sends the third signal light and the second signal light to the coupling splitter 502, the coupling splitter 502 couples the third signal light and the second signal light into the first signal light, and transmits the first signal light to the port switch 501 , and the port switch 501 is used to transmit the first signal light to the second node device 20 . Exemplarily, in the first preset state, for example, from the sub-node device 30N to the sub-node device 303 to the sub-node device 302 to the sub-node device 301, the signal light emitted from the transceiver and light-emitting modules in each sub-node device passes through The coupling splitter combines the optical fiber into the trunk fiber and transmits it to the first node device 10 . In the second preset state, the signal light emitted from the transceiver and luminous modules in each child node device, for example, from the child node device 302, the child node device 303 to the child node device 30N is combined through the coupling splitter. The backbone optical fiber is transmitted to the second node device 20.

It should be noted that determining that the optical communication system is in the first preset state or the second preset state can be achieved by a controller in the optical communication system. It should be added that the controller can be a controller already in the optical communication system. The reuse of some controllers can also be used to add new controllers in the optical communication system. The control can be implemented specifically as a frame-type componentized system or as a system-on-a-chip (SOC) composed of a single integrated chip, which is not specifically limited in this application.

Further, please refer to FIG. 3A. FIG. 3A is a schematic structural diagram of a protection switching device provided by an embodiment of the present application. The protection switching device 50 includes a port switch 501 and a coupling splitter 502. The port switch 501 includes a first port 1, a second port 2, a third port 3, a fourth port 4, a fifth port 5 and a sixth port 6. , the coupling splitter 502 includes a seventh port 7 , an eighth port 8 and a ninth port 9 . The fourth port 4 is connected to the seventh port 7 , the fifth port 5 is connected to the eighth port 8 , and the sixth port 6 is connected to the ninth port 9 . Among them, the protection switching device 50 plays the same role in each sub-node device. Taking the protection switching device deployed in the sub-node device 301 as an example, the first port is connected to the first node device 10, and the second port is connected to the first node device 10. It is connected to the backbone optical fiber, which leads to the second node device 20, and the third port is connected to the sub-node device 301. Specifically, the third port can be connected to the receiving and transmitting light module in the sub-node device 301. When protection switching devices are deployed in other sub-node devices, the connection of ports can be analogous to that of the sub-node device 301, which will not be described in detail in the embodiment of this application.

For specific implementation, please refer to Figure 3B. Figure 3B is a schematic diagram of the connection relationship between ports in a port switch provided by an embodiment of the present application. As shown in FIG. 3B , in the first preset state, the first port 1 is connected to the fourth port 4 , the second port 2 is connected to the fifth port 5 , and the third port 3 is connected to the sixth port 6 . The port switch 501 is used to receive the first signal light through the first port 1 and transmit the first signal light to the coupling splitter 502 through the fourth port 4. The coupling splitter 502 is used to split the first signal light into the second signal light. and the third signal light, and sends the second signal light and the third signal light to the fifth port 5 and the sixth port 6 of the port switch 501 respectively. The port switch 501 receives the second signal light through the fifth port 5 and The second signal light is emitted to the second node device 20 through the second port 2 , the third signal light is received through the sixth port 6 , and the third signal light is emitted to the child node device through the third port 3 . Wherein, the first signal light comes from the first node device 10 .

Please refer to Figure 3C. Figure 3C is a schematic diagram of the connection relationship between ports in another port switch provided by an embodiment of the present application. In the second preset state, the first port 1 and the sixth port 6 are connected. The second port 2 is connected to the fourth port 4, and the third port 3 is connected to the fifth port 5. In the second preset state, the port switch 501 is used to receive the first signal light through the second port 2 and transmit the first signal light to the coupling optical splitter 502 through the fourth port 4. The coupling optical splitter 502 is used to convert the first signal light to the coupling optical splitter 502. The signal light is split into a second signal light and a third signal light, and the second signal light and the third signal light are respectively sent to the fifth port 5 and the sixth port 6 of the port switch 501, and the port switch 501 passes through the sixth port. Port 6 receives the third signal light and transmits the third signal light to the first node device 10 through the first port 1. The fifth port 5 receives the second signal light and transmits the second signal light to the child node device through the third port 3. . Wherein, the first signal light comes from the second node device 20 .

The above describes the downlink communication situation in the first preset state and the second preset state. The uplink communication situation is specifically as follows: In the first preset state, the port switch 501 is used to receive from the third port 3 through the third port 3. The third signal light of the child node device is transmitted to the sixth port 6, and the second signal light is received through the second port 2 and transmitted to the fifth port 5. The coupling splitter 502 passes the eighth port 8 and the ninth port 9 respectively. Receive the second signal light and the third signal light, couple the second signal light and the third signal light into the first signal light, and transmit them to the port switch 501. The port switch 501 receives the first signal through the fourth port 4. The light is transmitted to the first port 1, and the port switch 501 sends the first signal light to the first node device 10 through the first port 1. In the second preset state, the port switch 501 is configured to receive the second signal light from the sub-node device through the third port 3 and transmit it to the fifth port 5, and to receive the third signal light through the first port 1 and transmit it. To the sixth port 6, the coupling splitter 502 receives the second signal light and the third signal light through the eighth port 8 and the ninth port 9 respectively, and couples the second signal light and the third signal light into the first signal light, and transmitted to the port switch 501. The port switch 501 receives the first signal light through the fourth port 4 and transmits it to the second port 2. The port switch 501 sends the first signal light to the second node device 20 through the second port 2. .

In the above implementation, the protection switching device can be implemented by a port switch based on a spatial optical path and a passive coupling splitter. The protection switching device has a simple structure and low cost. Using the protection switching device can reduce the protection of optical fiber links. Reduce the cost of the switching mechanism and improve its applicability.

The structure of the port switch 501 will be further described below in conjunction with the foregoing content.

In a possible implementation, the port switch 501 includes an optical path turning lens group. In the second preset state, the optical path turning lens group is used to disconnect the first port 1 and the fourth port 4 and establish the first port. The connection between port 1 and the sixth port 6, the connection between the second port 2 and the fifth port 5 is disconnected and the connection between the second port 2 and the fourth port 4 is established, and the connection between the third port 3 and the sixth port 6 is disconnected. And establish a connection between the third port 3 and the fifth port 5.

For example, the light path turning lens set may include two movable optical components, for example, the two movable optical components are a four-prism 5011 and a four-prism 5012. Please refer to Figure 4. Figure 4 is a schematic diagram of an optical path connection provided by an embodiment of the present application. As shown in (a) of Figure 4, in the first preset state, the four-sided prism 5011 and the four-sided prism 5012 are connected from the first port 1, the second port 2, the third port 3, the fourth port 4, and the fifth port. 5 and the sixth port 6 are moved away without affecting the direction of the spatial optical path. The first port 1, the second port 2, and the third port 3 establish optical paths with the fourth port 4, the fifth port 5, and the sixth port 6 respectively. Connection; As shown in (b) of Figure 4, in the second preset state, the four-sided prism 5011 and the four-sided prism 5012 are connected at the first port 1, the second port 2, the third port 3, the fourth port 4, and the fourth port 4. Between the fifth port 5 and the sixth port 6, the direction of the spatial optical path changes relative to the direction of the spatial optical path in the first preset state. At this time, the first port 1 and the sixth port 6 establish an optical path connection, and the second port 2 establishes an optical path connection with the fourth port 4, and the third port 3 establishes an optical path connection with the fifth port 5. Among them, in the second preset state, the port switch 501 is used to receive the first signal light through the second port 2. The first signal light is deflected by the square prism 5011 and then sent to the coupling splitter 502 through the fourth port 4. ; The port switch 501 receives the third signal light through the sixth port 6. The third signal light is reflected twice by the square prism 5012 and then deflected by the square prism 5011 and sent to the first port 1 of the port switch 501. Port The switch 501 transmits the third signal light to the first node device 10 through the first port 1; the port switch 501 receives the second signal light through the fifth port 5. The second signal light is deflected by the quadrangular prism 5011 and then switched to the port. The port switch 501 transmits the second signal light to the sub-node device through the third port 3. It should be noted that the connection relationship between the ports in the port switch 501 in Figure 4(a) corresponds to Figure 3B; the connection relationship between the ports in the port switch 501 in Figure 4(b) corresponds to Corresponds to Figure 3C.

For example, the optical path turning lens group may include a fixed optical component and a movable optical component. For example, the fixed optical component is a reflector 5014 and the movable optical component is a prism 5013. For specific implementation, please refer to Figure 5 , which is a schematic diagram of another optical path connection provided by an embodiment of the present application. As shown in (a) of Figure 5, in the first preset state, the reflector 5014 is at the first port 1, the second port 2, the third port 3, the fourth port 4, the fifth port 5 and the sixth port. Between ports 6, the quadrangular prism 5013 moves away from the first port 1, the second port 2, the third port 3 and the fourth port 4, the fifth port 5 and the sixth port 6 without affecting the direction of the spatial optical path. , the first port 1, the second port 2, and the third port 3 establish optical path connections with the fourth port 4, the fifth port 5, and the sixth port 6 respectively; as shown in (b) in Figure 5, in the second default In this state, the reflector 5014 and the square prism 5013 are between the first port 1, the second port 2, the third port 3, the fourth port 4, the fifth port 5 and the sixth port 6, and the direction of the spatial optical path is relative to The direction of the spatial optical path in the first preset state changes. At this time, the first port 1 establishes an optical path connection with the sixth port 6, the second port 2 establishes an optical path connection with the fourth port 4, and the third port 3 establishes an optical path connection with the fifth port. Port 5 establishes an optical path connection. Among them, in the second preset state, the port switch 501 is used to receive the first signal light through the second port 2. The first signal light is deflected by the square prism 5013 and then sent to the coupling splitter 502 through the fourth port 4. ; The port switch 501 receives the third signal light through the sixth port 6. The third signal light is reflected to the reflector 5014 through the square prism 5013, then reflected to the square prism 5013 through the reflector 5014, and then deflected through the square prism 5013. To the first port 1 of the port switch 501, the port switch 501 transmits the third signal light to the first node device 10 through the first port 1; the port switch 501 receives the second signal light through the fifth port 5. The signal light is deflected by the square prism 5013 and then sent to the third port 3 of the port switch 501. The port switch 501 transmits the second signal light to the child node device through the third port 3. It should be noted that the connection relationship between the ports in the port switch 501 in Figure 5(a) corresponds to Figure 3B; the connection relationship between the ports in the port switch 501 in Figure 5(b) corresponds to Corresponds to Figure 3C.

In yet another possible implementation, the port switch 501 includes an optical path turning lens group. In the first preset state, the optical path turning lens group is used to establish a connection between the first port 1 and the fourth port 4, and to establish a second The connection between port 2 and the fifth port 5 establishes the connection between the third port and the sixth port.

It should be noted that the foregoing description of the structure of the port switch 501 is only exemplary. In actual implementation, the port switch 501 can also be implemented using a 3*3 optical switch or other structures. This is not the case in the embodiment of this application. limited.

It should be understood that the port switch 501 can realize optical path connection through an optical path turning lens group or an optical switch, that is, the protection switching process can be realized by mechanically moving spatial optical elements. The technology involved is relatively mature, and the spatial optical path insertion loss is small and extinction is low. than high.

Example 2:

Further, please refer to FIG. 6A , which is a schematic diagram of another specific structure of a protection switching device 50 provided by an embodiment of the present application. The protection switching device 50 includes a port switch 501 and a coupling splitter 502. The port switch 501 includes a first port 1, a second port Port 2, third port 3, fourth port 4, fifth port 5, sixth port 6 and seventh port 7. The coupling splitter 502 includes an eighth port 8, a ninth port 9, a tenth port 10 and a tenth port. One port 11, the fourth port 4 is connected to the eighth port 8, the fifth port 5 is connected to the ninth port 9, the sixth port 6 is connected to the tenth port 10, the seventh port 7 is connected to the eleventh port 11 connected. The protection switching device 50 plays the same role in each sub-node device. Taking the protection switching device deployed in the sub-node device 301 as an example, the first port 1 is connected to the first node device 10, and the second port 1 is connected to the first node device 10. Port 2 is connected to the backbone optical fiber, which leads to the second node device 20. The third port 3 is connected to the sub-node device 301. Specifically, the third port 3 can be connected to the receiving and receiving module in the sub-node device 301. connect. When protection switching devices are deployed in other sub-node devices, the connection of ports can be analogous to that of the sub-node device 301, which will not be described in detail in the embodiment of this application.

In the specific implementation, please refer to Figure 6B. Figure 6B is a schematic diagram of the connection relationship between ports in another port switch provided by an embodiment of the present application. In the first preset state, the first port 1 and the fourth port 4 phases are connected, the second port 2 is connected to the fifth port 5, and the third port 3 is connected to the sixth port 6. In the first preset state, the port switch 501 is used to receive the first signal light through the first port 1 and transmit the first signal light to the coupling optical splitter 502 through the fourth port 4. The coupling optical splitter 502 is used to convert the first signal light to the coupling optical splitter 502. The signal light is split into a second signal light and a third signal light, and the second signal light and the third signal light are respectively sent to the fifth port 5 and the sixth port 6 of the port switch 501, and the port switch 501 passes through the fifth port. Port 5 receives the second signal light and transmits the second signal light to the second node device 20 through the second port 2, and receives the third signal light through the sixth port 6 and transmits the third signal light to the child node device through the third port 3. . Wherein, the first signal light comes from the first node device 10 .

Please refer to Figure 6C. Figure 6C is a schematic diagram of the connection relationship between ports in another port switch provided by an embodiment of the present application. In the second preset state, the first port 1 and the fourth port 4 are connected. The second port 2 is connected to the sixth port 6, and the third port 3 is connected to the seventh port 7. In the second preset state, the port switch 501 is used to receive the first signal light through the second port 2 and transmit the first signal light to the coupling optical splitter 502 through the sixth port 6. The coupling optical splitter 502 is used to convert the first signal light to the coupling optical splitter 502. The signal light is split into a second signal light and a third signal light, and the second signal light and the third signal light are respectively sent to the seventh port 7 and the fourth port 4 of the port switch 501. The port switch 501 passes through the fourth port. Port 4 receives the third signal light and transmits the third signal light to the first node device 10 through the first port 1. The seventh port 7 receives the second signal light and transmits the second signal light to the child node device through the third port 3. . Wherein, the first signal light comes from the second node device 20 .

In the second preset state, in addition to the connection relationship between the ports in the port switch 501 as shown in Figure 6C, it can also be as shown in Figure 6D and Figure 6E, specifically as follows:

Please refer to Figure 6D. Figure 6D is a schematic diagram of the connection relationship between ports in another port switch provided by an embodiment of the present application. In the second preset state, the first port 1 and the fourth port 4 are connected. The second port 2 is connected to the seventh port 7 , and the third port 3 is connected to the sixth port 6 . In the second preset state, the port switch 501 is used to receive the first signal light through the second port 2 and transmit the first signal light through the seventh port 7 to the coupling optical splitter 502. The coupling optical splitter 502 is used to convert the first signal light to the coupling optical splitter 502. The signal light is split into a second signal light and a third signal light, and the second signal light and the third signal light are respectively sent to the sixth port 6 and the fourth port 4 of the port switch 501. The port switch 501 passes through the fourth port. Port 4 receives the third signal light and transmits the third signal light to the first node device 10 through the first port 1, and receives the second signal light through the sixth port 6 and transmits the second signal light to the child node device through the third port 3. . Wherein, the first signal light comes from the second node device 20 .

Please refer to Figure 6E. Figure 6E is a schematic diagram of the connection relationship between ports in another port switch provided by an embodiment of the present application. In the second preset state, the first port 1 and the seventh port 7 are connected. The second port 2 is connected to the fifth port 5, and the third port 3 is connected to the fourth port 4. In the second preset state, the port switch 501 is used to receive the first signal light through the second port 2 and transmit the first signal light to the coupling optical splitter 502 through the fifth port 5. The coupling optical splitter 502 is used to convert the first signal light to the coupling optical splitter 502. The signal light is split into a second signal light and a third signal light, and the second signal light and the third signal light are respectively sent to the fourth port 4 and the seventh port 7 of the port switch 501, and the port switch 501 passes through the seventh port. Port 7 receives the third signal light and transmits the third signal light to the first node device 10 through the first port 1. The fourth port 4 receives the second signal light and transmits the second signal light to the child node device through the third port 3. . Wherein, the first signal light comes from the second node device 20 .

It should be understood that in the second preset state, the connection relationship between the ports in the port switch 501 is only explained as an example. Of course, there are other connection relationships between the ports, which are not limited by the embodiment of the present application.

The structure of the port switch 501 will be further described below in conjunction with the foregoing content.

In a possible implementation, the port switch 501 includes an optical path turning lens group. In the second preset state, the optical path turning lens group is used to disconnect the second port 2 and the fifth port 5 and establish a second The connection between port 2 and the sixth port 6 is disconnected, the connection between the third port 3 and the sixth port 6 is disconnected, and the connection between the third port 3 and the seventh port 7 is established.

For example, the light path turning lens group may include a movable optical component, for example, the movable optical component is a square prism 5015. For specific implementation, please refer to Figure 7 , which is a schematic diagram of another optical path connection provided by an embodiment of the present application. As shown in (a) of Figure 7, in the first preset state, the quadrangular prism 5015 is connected from the first port 1, the second port 2, the third port 3, the fourth port 4, the fifth port 5, and the sixth port 5015. Port 6 and seventh port 7 are moved away from each other without affecting the direction of the spatial optical path. The first port 1, the second port 2, and the third port 3 are respectively established with the fourth port 4, the fifth port 5, and the sixth port 6. Optical path connection; as shown in (b) in Figure 7, in the second preset state, The square prism 5015 is between the first port 1, the second port 2, the third port 3, the fourth port 4, the fifth port 5, the sixth port 6 and the seventh port 7. The direction of the spatial optical path is relative to the first port. The direction of the spatial optical path in the default state changes. At this time, the first port 1 and the fourth port 4 establish an optical path connection, the second port 2 and the sixth port 6 establish an optical path connection, and the third port 3 and the seventh port 7 establish an optical path connection. Establish optical path connection. Among them, in the second preset state, the port switch 501 is used to receive the first signal light through the second port 2. The first signal light is deflected by the square prism 5015 and then sent to the coupling splitter 502 through the sixth port 6. ; The port switch 501 receives the third signal light through the fourth port 4, and the third signal light does not pass through the square prism 5015, and the port switch 501 transmits the third signal light to the first node device 10 through the first port 1; Port switch The switch 501 receives the second signal light through the seventh port 7. The second signal light is deflected by the quadrangular prism 5015 and then sent to the third port 3 of the port switch 501. The port switch 501 transmits the signal light to the sub-node device through the third port 3. Emit the second signal light. It should be noted that the connection relationship between the ports in the port switch 501 in Figure 7(a) corresponds to Figure 6B; the connection relationship between the ports in the port switch 501 in Figure 7(b) corresponds to Corresponds to Figure 6C.

For example, the optical path turning lens group may include a movable optical component. For example, the movable optical component 5016 is composed of a four-sided prism 50161 and a four-sided prism 50162. For specific implementation, please refer to Figure 8 , which is a schematic diagram of another optical path connection provided by an embodiment of the present application. As shown in (a) of FIG. 8 , in the first preset state, the optical component 5016 switches from the first port 1 , the second port 2 , the third port 3 , the fourth port 4 , the fifth port 5 , and the sixth port 5016 . Port 6 and seventh port 7 are moved away from each other without affecting the direction of the spatial optical path. The first port 1, the second port 2, and the third port 3 are respectively established with the fourth port 4, the fifth port 5, and the sixth port 6. Optical path connection; As shown in (b) of Figure 8, in the second preset state, the optical component 5016 is connected to the first port 1, the second port 2, the third port 3, the fourth port 4, and the fifth port 5. , between the sixth port 6 and the seventh port 7, the direction of the spatial optical path changes relative to the direction of the spatial optical path in the first preset state. At this time, the first port 1 and the fourth port 4 establish an optical path connection. The second port 2 establishes an optical path connection with the sixth port 6, and the third port 3 establishes an optical path connection with the seventh port 7. Among them, in the second preset state, the port switch 501 is used to receive the first signal light through the second port 2. The first signal light is reflected twice by the square prism 50161 and then passes through the sixth port 6 to the coupling beam splitter 502. Send; the port switch 501 receives the third signal light through the fourth port 4, and the third signal light does not pass through the square prism 5015, and the port switch 501 transmits the third signal light to the first node device 10 through the first port 1; port The switch 501 receives the second signal light through the seventh port 7. The second signal light is reflected twice by the square prism 50162 and sent to the third port 3 of the port switch 501. The port switch 501 transmits to the child node through the third port 3. The device emits a second signal light. It should be noted that the connection relationship between the ports in the port switch 501 in Figure 8(a) corresponds to Figure 6B; the connection relationship between the ports in the port switch 501 in Figure 8(b) corresponds to Corresponds to Figure 6C.

In yet another possible implementation, the port switch 501 includes an optical path turning lens group; in the first preset state, the optical path turning lens group is used to establish a connection between the first port 1 and the fourth port 4, and to establish a second The connection between port 2 and the fifth port 5 establishes the connection between the third port 3 and the sixth port 6.

It should be noted that the foregoing description of the structure of the port switch 501 is only exemplary. In actual implementation, the port switch 501 can also be implemented using a 3×4 optical switch or other structures. This is not the case in the embodiment of this application. limited.

It should be understood that the port switch 501 can realize optical path connection through an optical path turning lens group or an optical switch, that is, the protection switching process can be realized by mechanically moving spatial optical elements. The technology involved is relatively mature, and the spatial optical path insertion loss is small and extinction is low. than high.

Example 3:

Please refer to Figure 9A. Figure 9A is a second structural schematic diagram of an optical communication system 100 provided by an embodiment of the present application. As shown in Figure 9A, the optical communication system 100 includes a first node device 10, a second node device 20, Child node device 301, child node device 302, child node device 303, child node device 30N and optical fiber 40; wherein, the first node device 10, child node device 301, child node device 302, child node device 303, child node device 30N , the second node devices 20 are connected to the ring network through optical fibers 40. Each sub-node device includes two light-receiving and transmitting modules, namely a main light-receiving module and a backup light-emitting module. The first node device 10 and the second node device 20 may be OLT devices, and the child node devices 301, 302, 303, and 30N may be ONUs. Among them, a protection switching device can be deployed in each sub-node device. It should be noted that the protection switching device can be deployed in the sub-node device or independently deployed in the optical communication system. The embodiments of this application are not limited. The use of this protection switching device can ensure the stability of communication services in the second preset state, and the protection switching device includes a port switch and a coupling splitter, which can reduce the cost of the protection switching mechanism of the optical fiber link and improve its applicability .

It should be noted that, under the structure shown in Figure 9A, each sub-node device includes a main receiving and lighting module and a backup receiving and lighting module. Among them, the main light-receiving module can be understood as the first light-receiving module, and the backup light-receiving module can be understood as the second light-receiving module. Please refer to Figure 9B. Figure 9B is a schematic diagram of another signal optical transmission provided by an embodiment of the present application. In the first preset state, there is an optical connection between the first receiving and receiving light module and the first node device 10 and with the first node device 10. There is no optical connection between the two node devices 20; there is no optical connection between the second light-transmitting module and the first node device 10; it can be understood that in the first preset state, the main light-transmitting module and the first node device There is an optical connection between 10, and There is no optical connection between the main transceiver and light-emitting module and the second node device 20; there is no optical connection between the backup transceiver and light-emitting module and the first node device 10, and there is no optical connection between the backup transceiver and light-emitting module and the second node device 20. There may or may not be an optical connection. When there is an optical connection, no optical signal is transmitted between the two. Please refer to FIG. 9C. FIG. 9C is a schematic diagram of another signal optical transmission provided by an embodiment of the present application. In the second preset state, between the first receiving and receiving light module in at least one child node device and the first node device 10 There is no optical connection between the second node device 10 and the second node device 20; there is no optical connection between the second receiving and receiving module in the at least one child node device and the first node device 10 and no optical connection with the second node device 10. There is an optical connection between 20; it can be understood that in the second preset state, there is no optical connection between the main transceiver and light-emitting module in at least one child node device and the first node device 10, and the main transceiver and light-emitting module and the first node device 10 There is no optical connection between the second node devices 20; there is no optical connection between the backup light-emitting module in the at least one child node device and the first node device 10, and there is no optical connection between the backup light-emitting module and the second node device 20. There is an optical connection between them. For example, in the second default state, there is no optical connection between the main transceiver and light-emitting module in the child node device 303 and the first node device 10, and there is no optical connection between the main transceiver and light-emitting module and the second node device 20. There is no optical connection between them; there is no optical connection between the backup light-emitting module in the child node device 303 and the first node device 10, and there is an optical connection between the backup light-emitting module and the second node device 20. To sum up, the main transceiver and light-emitting module in the child node device is used for optical communication with the first node device 10 in the first preset state, and the backup transceiver and light-emitting module in the child node device is used to perform optical communication with the first node device 10 in the second preset state. Optical communication is performed with the second node device 20 in the set state.

It should be noted that the main difference in structure between the optical communication system 100 shown in FIG. 9A and the optical communication system 100 shown in FIG. 1 is that in the optical communication system 100 shown in FIG. 9A, two sub-node devices are configured. The receiving and transmitting light modules are respectively the main receiving and transmitting light module and the backup receiving and transmitting light module. The main receiving and transmitting light module is used for optical communication with the first node device 10 in the first preset state, and the backup receiving and transmitting light module is used for performing optical communication with the first node device 10 in the first preset state. Optical communication is performed with the second node device 20 in the second preset state; in the optical communication system 100 shown in Figure 1, each sub-node device has only one receiving and receiving module, and the one receiving and receiving module is used for Optical communication is performed with the first node device 10 in the first preset state, or optical communication is performed with the second node device 20 in the second preset state.

The above describes the architecture of the optical communication system 100. Next, the specific structure of the protection switching device will be described.

Under the structure of an optical communication system 100 shown in Figure 9A, as shown in Figure 2, Figure 2 is a schematic diagram of a protection switching device 50 provided by an embodiment of the present application. The protection switching device 50 is in each sub-node device. The functions played are the same. For description, the protection switching device 50 is deployed in the sub-node device 301 as an example. The protection switching device 50 includes a port switch 501 and a coupling splitter 502. The port switch 501 is connected to the first The node device 10 is connected to the sub-node device 301, and the port switch 501 is connected to a backbone optical fiber that leads to the second node device 20. The specific implementation may refer to the above description. It should be noted that in the first preset state, the port switch 501 is used to send the second signal light to the second node device 20 and to the main receiving and receiving light module in the child node device. Send the third signal light; in the second preset state, the port switch 501 is used to send the third signal light to the first node device 10 and send the second signal light to the backup light-emitting module in the child node device. The specific uplink communication situation can also refer to the above description. It should be noted that in the first preset state, the port switch 501 is used to receive the second signal light and the third signal light from the main receiving and receiving light module of the child node device. ; In the second preset state, the port switch 501 is used to receive the third signal light and the second signal light from the backup light-emitting module of the sub-node device.

Further, please refer to FIG. 10A , which is a schematic diagram of another specific structure of a protection switching device 50 provided by an embodiment of the present application. The protection switching device 50 includes a port switch 501 and a coupling splitter 502. The port switch 501 includes a first port 1, a second port 2, a third port 3, a fourth port 4, a fifth port 5 and a sixth port 6. , seventh port 7 and eighth port 8, the coupling splitter 502 includes a ninth port 9, a tenth port 10, an eleventh port 11 and a twelfth port 12, the fifth port 5 is connected to the ninth port 9, The sixth port 6 is connected to the tenth port 10 , the seventh port 7 is connected to the eleventh port 11 , and the eighth port 8 is connected to the twelfth port 12 . Among them, taking the protection switching device deployed in the sub-node device 301 as an example, the first port 1 is connected to the first node device 10, the second port 2 is connected to the backbone optical fiber, and the backbone optical fiber leads to the second node device 20. The third port 3 is connected to the main transceiver and light-emitting module of the sub-node device 301, and the fourth port 4 is connected to the backup transceiver and light-emitting module of the sub-node device 301. When protection switching devices are deployed in other sub-node devices, the connection of ports can be analogous to that of the sub-node device 301, which will not be described in detail in the embodiment of this application.

In the specific implementation, please refer to Figure 10B. Figure 10B is a schematic diagram of the connection relationship between ports in another port switch provided by an embodiment of the present application. In the first preset state, the first port 1 and the fifth port 5 are connected, the second port 2 is connected to the sixth port 6, and the third port 3 is connected to the seventh port 7. In the first preset state, the port switch 501 receives the first signal light through the first port 1 and transmits the first signal light through the fifth port 5 to the coupling optical splitter 502. The coupling optical splitter 502 is used to convert the first signal light Split the light into the second signal light and the third signal light, and send the second signal light and the third signal light to the sixth port 6 and the seventh port 7 of the port switch 501 respectively, and the port switch 501 passes the sixth port 6 The second signal light is received and transmitted to the second node device 20 through the second port 2 , the third signal light is received through the seventh port 7 and the third signal light is transmitted to the child node device through the third port 3 . Wherein, the first signal light comes from the first node device 10 . It should be noted that the port switch 501 transmits the third signal light to the sub-node device through the third port 3. Specifically, it means that the port switch 501 transmits the third signal to the main receiving and receiving light module of the sub-node device through the third port 3. Light.

Please refer to Figure 10C. Figure 10C is a schematic diagram of the connection relationship between ports in another port switch provided by an embodiment of the present application. In the second preset state, the first port 1 is connected to the fifth port 5 , the second port 2 is connected to the seventh port 7 , and the fourth port 4 is connected to the eighth port 8 . In the second preset state, the port switch 501 receives the first signal light through the second port 2 and transmits the first signal light through the seventh port 7 to the coupling optical splitter 502. The coupling optical splitter 502 is used to convert the first signal light The light is split into a second signal light and a third signal light, and the second signal light and the third signal light are sent to the eighth port 8 and the fifth port 5 of the port switch 501 respectively. The port switch 501 passes through the fifth port 5 The third signal light is received and transmitted to the first node device 10 through the first port 1 , the second signal light is received through the eighth port 8 and the second signal light is transmitted to the child node device through the fourth port 4 . Wherein, the first signal light comes from the second node device 20 . It should be noted that the port switch 501 transmits the second signal light to the sub-node device through the fourth port 4. Specifically, it means that the port switch 501 transmits the second signal to the backup light-emitting module of the sub-node device through the fourth port 4. Light.

In the second preset state, in addition to the connection relationship between the ports in the port switch 501 as shown in Figure 10C, it can also be as shown in Figure 10D, Figure 10E and Figure 10F, as follows:

Please refer to Figure 10D. Figure 10D is a schematic diagram of the connection relationship between ports in another port switch provided by an embodiment of the present application. In the second preset state, the first port 1 and the seventh port 7 are in phase. The second port 2 is connected to the fifth port 5, and the fourth port 4 is connected to the sixth port 6. In the second preset state, the port switch 501 receives the first signal light through the second port 2 and transmits the first signal light through the fifth port 5 to the coupling optical splitter 502. The coupling optical splitter 502 is used to convert the first signal light Split the light into the second signal light and the third signal light, and send the second signal light and the third signal light to the sixth port 6 and the seventh port 7 of the port switch 501 respectively, and the port switch 501 passes the seventh port 7 The third signal light is received and transmitted to the first node device 10 through the first port 1 , the second signal light is received through the sixth port 6 and the second signal light is transmitted to the child node device through the fourth port 4 . Wherein, the first signal light comes from the second node device 20 . It should be noted that the port switch 501 transmits the second signal light to the sub-node device through the fourth port 4. Specifically, it may mean that the port switch 501 transmits the second signal light to the backup light-emitting module of the sub-node device through the fourth port 4. signal light.

Please refer to Figure 10E. Figure 10E is a schematic diagram of the connection relationship between ports in another port switch provided by an embodiment of the present application. In the second preset state, the first port 1 and the sixth port 6 are in phase. The second port 2 is connected to the eighth port 8, and the fourth port 4 is connected to the seventh port 7. In the second preset state, the port switch 501 receives the first signal light through the second port 2 and transmits the first signal light through the eighth port 8 to the coupling optical splitter 502. The coupling optical splitter 502 is used to convert the first signal light Split the light into the second signal light and the third signal light, and send the second signal light and the third signal light to the seventh port 7 and the sixth port 6 of the port switch 501 respectively, and the port switch 501 passes the sixth port 6 The third signal light is received and transmitted to the first node device 10 through the first port 1 , the second signal light is received through the seventh port 7 and the second signal light is transmitted to the child node device through the fourth port 4 . Wherein, the first signal light comes from the second node device 20 . It should be noted that the port switch 501 transmits the second signal light to the sub-node device through the fourth port 4. Specifically, it may mean that the port switch 501 transmits the second signal light to the backup light-emitting module of the sub-node device through the fourth port 4. signal light.

Please refer to Figure 10F. Figure 10F is a schematic diagram of the connection relationship between ports in another port switch provided by an embodiment of the present application. In the second preset state, the first port 1 and the eighth port 8 are in phase. The second port 2 is connected to the sixth port 6, and the fourth port 4 is connected to the fifth port 5. In the second preset state, the port switch 501 receives the first signal light through the second port 2 and transmits the first signal light through the sixth port 6 to the coupling optical splitter 502. The coupling optical splitter 502 is used to convert the first signal light Split the light into the second signal light and the third signal light, and send the second signal light and the third signal light to the fifth port 5 and the eighth port 8 of the port switch 501 respectively, and the port switch 501 passes the eighth port 8 The third signal light is received and transmitted to the first node device 10 through the first port 1 , the second signal light is received through the fifth port 5 and the second signal light is transmitted to the child node device through the fourth port 4 . Wherein, the first signal light comes from the second node device 20 . It should be noted that the port switch 501 transmits the second signal light to the sub-node device through the fourth port 4. Specifically, it means that the port switch 501 transmits the second signal to the backup light-emitting module of the sub-node device through the fourth port 4. Light.

It should be understood that in the second preset state, the connection relationship between the ports in the port switch 501 is only explained as an example. Of course, there are other connection relationships between the ports, which are not limited by the embodiment of the present application.

In the above implementation, the protection switching device can be implemented by a port switch based on a spatial optical path and a passive coupling splitter. The protection switching device has a simple structure and low cost. Using the protection switching device can reduce the protection of optical fiber links. Reduce the cost of the switching mechanism and improve its applicability.

The structure of the port switch 501 will be further described below in conjunction with the foregoing content.

In a possible implementation, the port switch 501 includes an optical path turning lens set or an optical switch; in the second preset state, the light path turning lens set or optical switch is used to disconnect the second port 2 and the sixth port 6 connection and disconnection of the third port 3 and the seventh port 7 and establishment of a connection between the second port 2 and the seventh port 7 .

By way of example, the port switch 501 includes an optical switch 5017, which may be 2×2. For specific implementation, please refer to Figure 11, which is a schematic diagram of another optical path connection provided by an embodiment of the present application; as shown in (a) in Figure 11, in the first preset state, the optical switch 5017 is used to Establishing an optical connection between the second port 2 and the sixth port 6; used to establish an optical connection between the third port 3 and the seventh port 7 Connection; As shown in (b) of Figure 11, in the second preset state, the optical switch 5017 is used to establish an optical connection between the second port 2 and the seventh port 7; optionally, the optical switch 5017 It can also be used to establish an optical connection between the third port 3 and the sixth port 6. It should be noted that the connection relationship between the ports in the port switch 501 in (a) of Figure 11 corresponds to that of Figure 10B; the connection relationship between the ports in the port switch 501 in (b) of Figure 11 corresponds to Corresponds to Figure 10C.

For example, the optical path turning lens group may include a movable optical component, for example, the movable optical component is a square prism 5018. For specific implementation, please refer to Figure 12, which is a schematic diagram of another optical path connection provided by an embodiment of the present application; as shown in (a) of Figure 12, in the first preset state, the four-sided prism 5018 moves from The first port 1, the second port 2, the third port 3, the fourth port 4, the fifth port 5, the sixth port 6, the seventh port 7 and the eighth port 8 are moved away from each other without affecting the direction of the spatial optical path. The first port 1, the second port 2, the third port 3, and the fourth port 4 establish optical path connections with the fifth port 5, the sixth port 6, the seventh port 7, and the eighth port 8 respectively; as shown in Figure 12(b) ), in the second default state, the square prism 5018 is at the first port 1, the second port 2, the third port 3, the fourth port 4, the fifth port 5, the sixth port 6, and the seventh port. Between 7 and the eighth port 8, the direction of the spatial optical path changes relative to the direction of the spatial optical path in the first preset state. At this time, the first port 1 and the fifth port 5 establish an optical path connection, and the second port 2 and the fifth port 5 establish an optical path connection. The seventh port 7 establishes an optical path connection, and the fourth port 4 and the eighth port 8 establish an optical path connection. Among them, in the second preset state, the port switch 501 is used to receive the first signal light through the second port 2. The first signal light is deflected by the square prism 5018 and then sent to the coupling splitter 502 through the seventh port 7. ; The port switch 501 receives the third signal light through the fifth port 5, and the third signal light does not pass through the square prism 5018, and the port switch 501 transmits the third signal light to the first node device 10 through the first port 1; Port switching The switch 501 receives the second signal light through the eighth port 8, and the second signal light does not pass through the square prism 5018. The port switch 501 transmits the second signal light to the child node device through the fourth port 4. Among them, the light input from the third port 3 passes through the square prism 5018 to achieve optical path deviation and then deviates from all output ports, that is, it is not output from any port. It should be noted that the connection relationship between the ports in the port switch 501 in (a) of Figure 12 corresponds to that of Figure 10B; the connection relationship between the ports in the port switch 501 in (b) of Figure 12 corresponds to Corresponds to Figure 10C.

For example, the optical path turning lens group may include a movable optical component, for example, the movable optical component is a square prism 5019. In the specific implementation, please refer to Figure 13, which is a schematic diagram of another optical path connection provided by an embodiment of the present application; as shown in (a) of Figure 13, in the first preset state, the four-sided prism 5019 starts from the first The first port 1, the second port 2, the third port 3, the fourth port 4, the fifth port 5, the sixth port 6, the seventh port 7 and the eighth port 8 are moved away from each other without affecting the direction of the spatial optical path. The first port 1, the second port 2, the third port 3, and the fourth port 4 establish optical path connections with the fifth port 5, the sixth port 6, the seventh port 7, and the eighth port 8 respectively; as shown in Figure 13(b) ), in the second default state, the square prism 5019 is at the first port 1, the second port 2, the third port 3, the fourth port 4, the fifth port 5, the sixth port 6, and the seventh port. Between 7 and the eighth port 8, the direction of the spatial optical path changes relative to the spatial optical path in the first preset state. At this time, the first port 1 and the fifth port 5 establish an optical path connection, and the second port 2 and the seventh port Port 7 establishes an optical path connection, and the fourth port 4 and the eighth port 8 establish an optical path connection. Among them, in the second preset state, the port switch 501 is used to receive the first signal light through the second port 2. The first signal light is reflected twice by the square prism 5019 and sent to the coupling splitter 502 through the seventh port 7. ; The port switch 501 receives the third signal light through the fifth port 5, and the third signal light does not pass through the square prism 5019, and the port switch 501 transmits the third signal light to the first node device 10 through the first port 1; Port switch The switch 501 receives the second signal light through the eighth port 8, and the second signal light does not pass through the square prism 5019. The port switch 501 transmits the second signal light to the child node device through the fourth port 4. Among them, the light input from the third port 3 passes through the square prism 5019 to achieve optical path deviation and then deviates from all output ports, that is, it is not output from any port. It should be noted that the connection relationship between the ports in the port switch 501 in (a) of Figure 13 corresponds to that of Figure 10B; the connection relationship between the ports in the port switch 501 in (b) of Figure 13 corresponds to Corresponds to Figure 10C.

In another possible implementation, the port switch 501 includes an optical path turning lens set or an optical switch; in the first preset state, the light path turning lens set or optical switch is used to establish the first port 1 and the fifth port 5 The connection is established, the connection between the second port 2 and the sixth port 6 is established, and the connection between the third port 3 and the seventh port 7 is established.

It should be noted that the foregoing description of the structure of the port switch 501 is only exemplary. In actual implementation, the port switch 501 can also be implemented using a 4*4 optical switch or other structures. This is not the case in the embodiment of this application. limited.

It should be understood that the port switch 501 can realize optical path connection through an optical path turning lens group or an optical switch, that is, the protection switching process can be realized by mechanically moving spatial optical elements. The technology involved is relatively mature, and the spatial optical path insertion loss is small and extinction is low. than high.

Example 4:

Please refer to Figure 14A. Figure 14A is a third structural schematic diagram of an optical communication system 100 provided by an embodiment of the present application. As shown in Figure 14A, the optical communication system 100 includes a first node device 10, a second node device 20, Child node device 301, child node device 302, child node device 303, child node device 30N and optical fiber 40; wherein, the first node device 10, child node device 301, child node device 302, child node device 303, child node device 30N , the second node devices 20 are connected to the ring network through optical fibers 40. Among them, in each sub-node device Both include two light-receiving and transmitting modules, namely light-receiving and transmitting module 1 and light-receiving and transmitting module 2. The first node device 10 and the second node device 20 may be OLT devices, and the child node devices 301, 302, 303, and 30N may be ONUs. Among them, a protection switching device can be deployed in each sub-node device. It should be noted that the protection switching device can be deployed in the sub-node device or independently deployed in the optical communication system. The embodiments of this application are not limited. The use of this protection switching device can ensure the stability of communication services in the second preset state, and the protection switching device includes a port switch and a coupling splitter, which can reduce the cost of the protection switching mechanism of the optical fiber link and improve its applicability .

It should be noted that the main difference in structure between the optical communication system 100 shown in FIG. 9A and the optical communication system 100 shown in FIG. 14A is that, no matter in the first preset state or the second preset state, the structure shown in FIG. 9A In the optical communication system 100 shown, each sub-node device only communicates with the first node device 10 or the second node device 20, and only one of the two receiving and receiving light modules in the sub-node device works. In the first preset state, each sub-node device in the optical communication system 100 shown in FIG. 14A can communicate with the first node device 10 and the second node device 20 at the same time, and two of the sub-node devices receive and receive light. Modules are working.

The above describes the architecture of the optical communication system 100. Next, the specific structure of the protection switching device will be described.

Under the structure of an optical communication system 100 shown in Figure 14A, as shown in Figure 2, Figure 2 is a schematic diagram of a protection switching device 50 provided by an embodiment of the present application. The protection switching device 50 is in each sub-node device. The functions played are the same. For description, the protection switching device 50 is deployed in the sub-node device 301 as an example. The protection switching device 50 includes a port switch 501 and a coupling splitter 502. The port switch 501 is connected to the first The node device 10 is connected to the sub-node device 301, and the port switch 501 is connected to a backbone optical fiber that leads to the second node device 20. The sub-node device includes a first light-receiving module and a second light-receiving module. It can be understood that each sub-node device includes two light-receiving modules, which are respectively light-receiving module 1 and light-receiving module 2 .

In specific implementation, the port switch 501 is used to receive the first signal light from the first node device 10 and transmit the first signal light to the coupling optical splitter 502 . The coupling splitter 502 is used to split the first signal light into the second signal light and the third signal light, and send the second signal light and the third signal light to the port switch 501 . The port switch 501 is used to send the second signal light to the second node device 20, and to send the third signal light to the first receiving and receiving light module in the child node device.

The port switch 501 is configured to receive the fourth signal light from the second node device 20 and transmit the fourth signal light to the coupling splitter 502 . The coupling splitter 502 is used to split the fourth signal light into a fifth signal light and a sixth signal light. And the fifth signal light and the sixth signal light are sent to the port switch 501. The port switch 501 is used to send the sixth signal light to the first node device 10, and to send the fifth signal light to the second receiving and receiving light module in the child node device, where the optical power ratio of the second signal light to the third signal light is is the first ratio, the optical power ratio of the sixth signal light and the fifth signal light is the second ratio, and the first ratio and the second ratio are reciprocals of each other. It should be noted that the first signal light and the fourth signal light have different wavelengths.

As an example, a protection switching device is deployed in each sub-node device. Please refer to Figure 14B. Figure 14B is a schematic diagram of another signal optical transmission provided by an embodiment of the present application. In the first preset state, during downlink communication, the first node device 10 sends a central wavelength of The first signal light of λ1 is received by the sub-node device 301 through the port switch 501 and transmitted to the coupling splitter 502. The coupling splitter 502 splits the first signal light into a second signal light and a third signal. light, and sends the second signal light and the third signal light to the port switch 501. The port switch 501 is used to send the second signal light to the child node device 302, and to the first receiving and receiving light in the child node device 301. The module sends the third signal light. The child node device 302 receives the second signal light through the port switch 501 and transmits it to the coupling optical splitter 502. The coupling optical splitter 502 splits the second signal light into a fourteenth signal light and a fifteenth signal light, and splits the second signal light into a fourteenth signal light and a fifteenth signal light. The fourteenth signal light and the fifteenth signal light are sent to the port switch 501. The port switch 501 is used to send the fourteenth signal light to the sub-node device 303, and to the first receiving and receiving light module in the sub-node device 302. The fifteenth signal light. By analogy, the fourteenth signal light is transmitted from the sub-node device 303 to the sub-node device 30N. At each sub-node device, a portion of the signal power is split through a coupling splitter to the first receiving and receiving light module of the sub-node device to complete downlink communication. , and the remaining signal power continues to be transmitted to the next child node device. Among them, the ratio of the power of the fifteenth signal light and the fourteenth signal light increases sequentially compared with the ratio of the power of the third signal light and the second signal light. It should be noted that from the sub-node device 301 to the sub-node device 301 From the node device 302 to the direction of the child node device 30N, the ratio of the power of the optical signal in the light-transmitting module 1 in the child node device to the power of the optical signal in the trunk fiber gradually increases. For example, the power of the optical signal in the light-receiving module 1 in the child node device 301 gradually increases. The ratio of the power of the optical signal to the power of the optical signal of the backbone fiber is 1:9; the ratio of the power of the optical signal in the light-receiving module 1 in the sub-node device 302 to the power of the optical signal of the backbone fiber is 2:8; The ratio of the power of the optical signal in the light-receiving module 1 in the sub-node device 303 to the power of the optical signal in the trunk fiber is 3:7. By analogy, the power of the optical signal in the light-receiving module 1 in the sub-node device 30N is The power ratio of the optical signals in the backbone fiber is 9:1. At this time, the second node device 20 sends the fourth signal light with a center wavelength of λ ₂ to the child node device 30N. The child node device 30N receives the fourth signal light through the port switch 501 and transmits it to the coupling splitter 502. The optical splitter 502 splits the fourth signal light into the fifth signal light and the sixth signal light, and sends the fifth signal light and the sixth signal light to the port switch 501 , which is used to transmit the signal light to the sub-node device 30 (N-1) Send the sixth signal light, and send the fifth signal light to the second light-receiving module in the child node device 30N. The child node device 30 (N-1) receives the sixth signal light through the port switch 501 and transmits it to the coupling splitter 502, which splits the sixth signal light into a seventh signal light and an eighth signal light, And send the seventh signal light and the eighth signal light to the port switch 501, which is used to send the seventh signal light to the sub-node device 30(N-2), and to the sub-node device 30(N-2). The second light-receiving module in 1) sends the eighth signal light. By analogy, the seventh signal light travels from the child node device 30 (N-3) to the child node device 303 to the child node device 302 to the child node device 301, and a portion of the signal power is split through the coupling splitter at each child node device. The second receiving and transmitting light module of the sub-node device completes downlink communication, and the remaining signal power continues to be transmitted to the next sub-node device. Among them, the ratio of the power of the eighth signal light and the seventh signal light increases sequentially compared with the ratio of the power of the sixth signal light and the fifth signal light. It should be noted that from the sub-node device 30N to the sub-node device 30(N-1) until the direction from the child node device 302 to the child node device 301, the ratio of the power of the optical signal in the receiving and receiving module 2 of the child node device to the power of the optical signal of the backbone fiber gradually increases, for example, the child node The ratio of the power of the optical signal in the light-receiving module 2 in the device 30N to the power of the optical signal in the backbone fiber is 1:9; the power of the optical signal in the light-receiving module 2 in the sub-node device 30(N-1) is The ratio of the power of the optical signal of the optical fiber is 2:8; and by analogy, the ratio of the power of the optical signal in the receiving and receiving module 2 of the sub-node device 302 to the power of the optical signal of the trunk fiber is 8:2. The sub-node device The ratio of the power of the optical signal in the receiving and receiving optical module 2 in 301 to the power of the optical signal of the backbone optical fiber is 9:1.

Please refer to Figure 14C. Figure 14C is a schematic diagram of another signal optical transmission provided by an embodiment of the present application. In the second preset state, during downlink communication, for example, between the child node device 301 and the child node device 302 If the optical fiber is broken, the communication service between the first node device 10 and the child node device 302 is interrupted. At this time, the second node device 20 sends the fourth signal light with a center wavelength of λ ₂ to the child node device 30N. The transmission direction of the four-signal light is from the sub-node device 30N to the sub-node device 303 to the sub-node device 302. For details, please refer to the above description and will not be described again here. The first node device 10 sends the first signal light with the center wavelength λ1 to the child node device 301. The child node device 301 receives the first signal light through the port switch 501 and transmits it to the coupling optical splitter 502. The coupling optical splitter 502 Split the first signal light into the second signal light and the third signal light, send the second signal light and the third signal light to the port switch 501, and send the third signal light to the first receiving and receiving light module in the child node device 301. Three signal lights, but due to fiber breakage between the sub-node device 302 and the sub-node device 301, the second signal light cannot be sent to the sub-node device 302.

The above describes the situation of downlink communication. The situation of uplink communication is as follows: the port switch 501 is used to receive the second signal light and the third signal light from the first receiving and receiving light module in the sub-node device, and combine the second signal light and the third signal light. The three signal lights are sent to the coupling splitter 502. The coupling splitter 502 couples the second signal light and the third signal light into the first signal light, and transmits the first signal light to the port switch 501. The port switch 501 is used for Transmit the first signal light to the first node device 10; the port switch 501 is used to receive the fifth signal light and the sixth signal light from the second receiving and receiving light module in the child node device, and convert the fifth signal light and the sixth signal light The light is sent to the coupling splitter 502. The coupling splitter 502 couples the fifth signal light and the sixth signal light into a fourth signal light, and transmits the fourth signal light to the port switch 501. The port switch 501 is used to convert the fourth signal light. Four signals are optically transmitted to the second node device 20 . For example, during uplink communication, the signal light emitted from the receiving and transmitting light module 1 in each sub-node device is combined into the trunk optical fiber through the coupling splitter 502 and transmitted to the first node device 10; The signal light emitted by the receiving and receiving light module 2 is combined into the trunk optical fiber through the coupling splitter 502 and transmitted to the second node device 20 .

Further, please refer to FIG. 15A , which is a schematic diagram of another specific structure of a protection switching device 50 provided by an embodiment of the present application. The protection switching device 50 includes a port switch 501 and a coupling splitter 502. The port switch 501 includes a first port 1, a second port 2, a third port 3, a fourth port 4, a fifth port 5 and a sixth port 6. , seventh port 7 and eighth port 8, the coupling splitter 502 includes a ninth port 9, a tenth port 10, an eleventh port 11 and a twelfth port 12, where the fifth port 5 is in phase with the ninth port 9 The sixth port 6 is connected to the tenth port 10, the seventh port 7 is connected to the eleventh port 11, and the eighth port 8 is connected to the twelfth port 12. Among them, taking the protection switching device deployed in the sub-node device 301 as an example, the first port 1 is connected to the first node device 10, the second port 2 is connected to the backbone optical fiber, and the backbone optical fiber leads to the second node device 20. The third port 3 is connected to the first light-transmitting module of the child node device 301 , for example, the light-transmitting module 1 , and the fourth port 4 is connected to the second light-transmitting module of the child node device 301 , for example, the light-transmitting module 2 . When protection switching devices are deployed in other sub-node devices, the connection of ports can be analogous to that of the sub-node device 301, which will not be described in detail in the embodiment of this application.

In the specific implementation, please refer to Figure 15B. Figure 15B is a schematic diagram of the connection relationship between ports in another port switch provided by an embodiment of the present application. The first port 1 and the fifth port 5 are connected, and the second port 2 It is connected to the sixth port 6, and the third port 3 is connected to the seventh port 7. The port switch 501 is used to receive the first signal light through the first port 1 and transmit the first signal light to the coupling splitter 502 through the fifth port 5. The coupling splitter 502 is used to split the first signal light into the second signal light. and the third signal light, and sends the second signal light and the third signal light to the sixth port 6 and the seventh port 7 of the port switch 501 respectively. The port switch 501 receives the second signal light through the sixth port 6 and The second signal light is emitted to the second node device 20 through the second port 2, the third signal light is received through the seventh port 7, and the third signal light is emitted to the first receiving and receiving light module in the child node device through the third port 3. As shown in FIG. 15B , the process of receiving the transmission of the first signal light through the first port 1 may be called a forward transmission process.

Please refer to Figure 15C. Figure 15C is a schematic diagram of the connection relationship between ports in another port switch provided by an embodiment of the present application. The first port 1 is connected to the fifth port 5, and the second port 2 is connected to the seventh port. 7 is connected, and the fourth port 4 is connected to the eighth port 8. The port switch 501 is configured to receive the fourth signal light through the second port 2 and transmit the fourth signal light to the coupling optical splitter 502 through the seventh port 7. The coupling optical splitter 502 is used to split the fourth signal light into the fifth signal light. and the sixth signal light, and sends the fifth signal light and the sixth signal light to the eighth port 8 and the fifth port 5 of the port switch 501 respectively. The port switch 501 receives the sixth signal light through the fifth port 5 and The sixth signal light is emitted to the first node device 10 through the first port 1, the fifth signal light is received through the eighth port 8, and the fifth signal light is emitted to the second receiving and receiving light module in the child node device through the fourth port 4. As shown in FIG. 15C , the process of receiving the transmission of the fourth signal light through the second port 2 may be called a reverse transmission process.

In the case of reverse transmission, in addition to the connection relationship between the ports in the port switch 501 as shown in Figure 15C, it can also be shown in Figure 15D, Figure 15E, and Figure 15F, as follows:

Please refer to Figure 15D. Figure 15D is a schematic diagram of the connection relationship between ports in another port switch provided by an embodiment of the present application. The first port 1 is connected to the seventh port 7, and the second port 2 is connected to the fifth port. 5 are connected, and the fourth port 4 is connected to the sixth port 6. The port switch 501 is configured to receive the fourth signal light through the second port 2 and transmit the fourth signal light to the coupling optical splitter 502 through the fifth port 5. The coupling optical splitter 502 is used to split the fourth signal light into the fifth signal light. and the sixth signal light, and sends the fifth signal light and the sixth signal light to the sixth port 6 and the seventh port 7 of the port switch 501 respectively. The port switch 501 receives the sixth signal light through the seventh port 7 and The sixth signal light is emitted to the first node device 10 through the first port 1, the fifth signal light is received through the sixth port 6, and the fifth signal light is emitted to the second receiving and receiving light module in the child node device through the fourth port 4.

Please refer to Figure 15E. Figure 15E is a schematic diagram of the connection relationship between ports in another port switch provided by an embodiment of the present application. The first port 1 is connected to the eighth port 8, and the second port 2 is connected to the sixth port. 6 phases are connected, and the fourth port 4 is connected to the fifth port 5. The port switch 501 is configured to receive the fourth signal light through the second port 2 and transmit the fourth signal light to the coupling optical splitter 502 through the sixth port 6. The coupling optical splitter 502 is used to split the fourth signal light into the fifth signal light. and the sixth signal light, and sends the fifth signal light and the sixth signal light to the fifth port 5 and the eighth port 8 of the port switch 501 respectively. The port switch 501 receives the sixth signal light through the eighth port 8 and The sixth signal light is emitted to the first node device 10 through the first port 1, the fifth signal light is received through the fifth port 5, and the fifth signal light is emitted to the second receiving and receiving light module in the child node device through the fourth port 4.

Please refer to Figure 15F. Figure 15F is a schematic diagram of the connection relationship between ports in another port switch provided by an embodiment of the present application. The first port 1 is connected to the sixth port 6, and the second port 2 is connected to the eighth port. 8 is connected, and the fourth port 4 is connected to the seventh port 7. The port switch 501 is configured to receive the fourth signal light through the second port 2 and transmit the fourth signal light to the coupling optical splitter 502 through the eighth port 8. The coupling optical splitter 502 is used to split the fourth signal light into the fifth signal light. and the sixth signal light, and sends the fifth signal light and the sixth signal light to the seventh port 7 and the sixth port 6 of the port switch 501 respectively. The port switch 501 receives the sixth signal light through the sixth port 6 and The sixth signal light is emitted to the first node device 10 through the first port 1, the fifth signal light is received through the seventh port 7, and the fifth signal light is emitted to the second receiving and receiving light module in the child node device through the fourth port 4.

It should be understood that during reverse transmission, the connection relationship between the ports in the port switch 501 is only explained as an example. Of course, there are also connection relationships between other ports, which are not limited by the embodiment of the present application.

In the above implementation, the protection switching device can be implemented by a port switch based on a spatial optical path and a passive coupling splitter. The protection switching device has a simple structure and low cost. Using the protection switching device can reduce the protection of optical fiber links. Reduce the cost of the switching mechanism and improve its applicability. Moreover, through the architecture shown in Figure 14A, waste of resources can be avoided.

The structure of the port switch 501 will be further described below in conjunction with the foregoing content.

In a possible implementation, the port switch includes a first optical path turning lens group; the first optical path turning lens group is used to establish a connection between the second port 2 and the sixth port 6 to facilitate the transmission of the second signal light, and Establish a connection between the third port 3 and the seventh port 7 to facilitate the transmission of the third signal light; the first optical path turning lens group is also used to establish a connection between the second port 2 and the seventh port 7 to facilitate the transmission of the fourth signal light. .

Exemplarily, the first optical path turning lens group may include a quadrangular prism 701, wherein S ₁ and S ₂ of the quadrangular prism 701 are transmitted to the second signal light and the third signal light, and S ₁ and S of the quadrangular prism 701 ₂ faces the fourth signal light reflection. For specific implementation, please refer to Figure 16, which is a schematic diagram of another optical path connection provided by an embodiment of the present application. As shown in (a) of FIG. 16 , the first port 1 is connected to the fifth port 5 , the second port 2 is connected to the sixth port 6 , and the third port 3 is connected to the seventh port 7 . The port switch 501 is used to receive the first signal light through the first port 1 and transmit the first signal light to the coupling splitter 502 through the fifth port 5, where the first signal light does not pass through the square prism 701. The port switch 501 The second signal light is received through the sixth port 6. The second signal light is transmitted through the S ₁ surface of the square prism 701 and sent to the second port 2 of the port switch 501. The port switch 501 transmits the signal light to the second port through the second port 2. The node device 20 emits the second signal light, and the port switch 501 receives the third signal light through the seventh port 7. The third signal light is transmitted through the S ₁ surface of the square prism 701 and is sent to the port switch. The port switch 501 transmits the third signal light to the first receiving and receiving light module in the child node device through the third port 3. As shown in (b) of FIG. 16 , the first port 1 is connected to the fifth port 5 , the second port 2 is connected to the seventh port 7 , and the fourth port 4 is connected to the eighth port 8 . The port switch 501 is used to receive the fourth signal light through the second port 2. The fourth signal light is reflected twice through the S ₁ and S ₂ surfaces of the quadrangular prism 701 to the seventh port 7 of the port switch 501. The port switch 501 emits the fourth signal light to the coupling splitter 502 through the seventh port 7, and the port switch 501 receives the sixth signal light through the fifth port 5. The sixth signal light does not pass through the square prism 701, and the port switch 501 passes through the first Port 1 emits the sixth signal light to the first node device 10 , and the port switch 501 receives the fifth signal light through the eighth port 8 . The fifth signal light does not pass through the square prism 701 , and the port switch 501 transmits the fifth signal light to the first node device 10 through the fourth port 4 . The second light-receiving module in the child node device emits fifth signal light. It should be noted that the connection relationship between the ports in the port switch 501 in (a) of Figure 16 corresponds to that of Figure 15B; the connection relationship between the ports in the port switch 501 in (b) of Figure 16 corresponds to Corresponds to Figure 15C.

For example, the first optical path turning lens group may include a filter plate 702, wherein the filter plate 702 is transparent to the second signal light and the third signal light, and the filter plate 702 is reflective to the fourth signal light. For specific implementation, please refer to Figure 17, which is a schematic diagram of another optical path connection provided by an embodiment of the present application. As shown in FIG. 17 , the second port 2 is connected to the sixth port 6 , and the third port 3 is connected to the seventh port 7 . The port switch 501 is configured to receive the first signal light through the first port 1 and transmit the first signal light to the coupling splitter 502 through the fifth port 5, wherein the first signal light does not pass through the filter 702. The port switch 501 The second signal light is received through the sixth port 6. The second signal light is transmitted through the filter 702 and sent to the second port 2 of the port switch 501. The port switch 501 transmits to the second node device 20 through the second port 2. For the second signal light, the port switch 50150 receives the third signal light through the seventh port 7. The third signal light is transmitted through the filter 702 and sent to the third port 3 of the port switch 501. The port switch 501 passes through the third port 7. Port 3 emits the third signal light to the first receiving and receiving light module in the child node device. As shown in Figure 17, the second port 2 is connected to the seventh port 7. Specifically, the port switch 501 is configured to receive the fourth signal light through the second port 2. The fourth signal light is reflected to the seventh port 7 of the port switch 501 through the filter 702, and the port switch 501 passes through the seventh port 7. The fourth signal light is emitted to the coupling splitter 502. The port switch 501 receives the sixth signal light through the fifth port 5. The sixth signal light does not pass through the filter 702. The port switch 501 transmits the signal light to the first node through the first port 1. The device 10 emits the sixth signal light, and the port switch 501 receives the fifth signal light through the eighth port 8. The fifth signal light does not pass through the filter 702. The port switch 501 transmits the second signal light to the sub-node device through the fourth port 4. The receiving and receiving light module emits the fifth signal light. It should be noted that the connection relationship between the ports in the port switch 501 in Figure 17 corresponds to Figure 15B and Figure 15C.

For example, the first optical path turning lens group may include a four-port circulator 703, where the light passing direction of the four ports C ₁ -C ₄ of the four-port circulator 703 is C ₁ →C ₂ →C ₃ →C ₄ , the four ports C ₁ , C ₂ , C ₃ , and C ₄ are respectively connected to the sixth port, the second port, the seventh port, and the third port of the port switch 501 . For specific implementation, please refer to Figure 18, which is a schematic diagram of another optical path connection provided by an embodiment of the present application. As shown in FIG. 18 , the second port 2 is connected to the sixth port 6 , and the third port 3 is connected to the seventh port 7 . Specifically, the port switch 501 is configured to receive the first signal light through the first port 1 and transmit the first signal light to the coupling splitter 502 through the fifth port 5 , wherein the first signal light does not pass through the four-port circulator 703 , the port switch 501 receives the second signal light through the sixth port 6, and the second signal light is sent to the second port 2 of the port switch 501 through the four-port circulator 703, and the port switch 501 transmits the signal light to the third port through the second port 2. The two-node device 20 emits the second signal light, and the port switch 50150 receives the third signal light through the seventh port 7. The third signal light is sent to the third port 3 of the port switch 501 through the four-port circulator 703. The port switch The controller 501 transmits the third signal light to the first receiving and receiving light module in the child node device through the third port. As shown in Figure 18, the second port 2 is connected to the seventh port 7. Specifically, the port switch 501 is configured to receive the fourth signal light through the second port 2, and the fourth signal light is sent to the seventh port 7 of the port switch 501 through the four-port circulator 703, and the port switch 501 passes through the seventh port. Port 7 emits the fourth signal light to the coupling splitter 502, and the port switch 501 receives the sixth signal light through the fifth port 5. The sixth signal light does not pass through the four-port circulator 703, and the port switch 501 passes through the first port 1. The sixth signal light is emitted to the first node device 10. The port switch 501 receives the fifth signal light through the eighth port 8. The fifth signal light does not pass through the four-port circulator 703. The port switch 501 transmits the fifth signal light to the first node device 10 through the fourth port 4. The second light-receiving module in the child node device emits fifth signal light. It should be noted that the connection relationship between the ports in the port switch 501 in Figure 18 corresponds to Figures 15B and 15C.

It should be noted that the foregoing description of the structure of the port switch 501 is only exemplary. In actual implementation, the port switch 501 can also be implemented using a 4*4 optical switch or other structures. This is not the case in the embodiment of this application. limited.

It should be understood that the port switch 501 can realize optical path connection through an optical path turning lens group or an optical switch, that is, the protection switching process can be realized by mechanically moving spatial optical elements. The technology involved is relatively mature, and the spatial optical path insertion loss is small and extinction is low. than high.

Example 5:

Please refer to Figure 19A. Figure 19A is a fourth structural schematic diagram of an optical communication system 100 provided by an embodiment of the present application. As shown in Figure 19A, the optical communication system 100 includes a first node device 10, a second node device 20, Sub-node equipment 301, sub-node equipment 302, sub-node equipment 303, sub-node equipment 30N and optical fiber 40; wherein, the first node equipment 10, sub-node equipment 301, sub-node equipment 302, sub-node The point device 303, the sub-node device 30N, and the second node device 20 are connected to the ring network through the optical fiber 40. A connection is established between the first node device 10 and the second node device 20, where each sub-node device includes two light-transmitting modules, namely the light-transmitting module 1 and the light-transmitting module 2. The first node device 10 and the second node device 20 may be OLT devices, and the child node devices 301, 302, 303, and 30N may be ONUs. Among them, a protection switching device can be deployed in each sub-node device. It should be noted that the protection switching device can be deployed in the sub-node device or independently deployed in the optical communication system. The embodiments of this application are not limited. The use of this protection switching device can ensure the stability of communication services, and the protection switching device includes a port switch and a coupling optical splitter, which can reduce the cost of the protection switching mechanism of optical fiber links and improve its applicability.

It should be noted that the main difference in structure between the optical communication system 100 shown in FIG. 19A and the optical communication system 100 shown in FIG. 14A is that in the optical communication system 100 shown in FIG. 19A , in the first preset state and the second In the default state, regardless of forward transmission or reverse transmission, each sub-node device can communicate with the first node device 10 and the second node device 20 at the same time, and the two transceiver and light-emitting modules in the sub-node device work at the same time. In the optical communication system 100 shown in Figure 14A, in the second preset state, each sub-node device can only communicate with the first node device 10 or the second node device 20, and two of the sub-node devices receive and receive light. Only one transceiver module in the module works. Among them, the direction in which the first node device 10 sends the first signal light to the child node device 301 is called forward transmission, and the direction in which the second node device 20 sends the fourth signal light to the child node device 30N is called reverse transmission.

The above describes the architecture of the optical communication system 100. Next, the specific structure of the protection switching device will be described.

Under the structure of an optical communication system 100 shown in Figure 19A, as shown in Figure 2, Figure 2 is a schematic diagram of a protection switching device 50 provided by an embodiment of the present application. The protection switching device 50 is in each sub-node device. The functions played are the same. For description, the protection switching device 50 is deployed in the sub-node device 301 as an example. The protection switching device 50 includes a port switch 501 and a coupling splitter 502. The port switch 501 is connected to the first The node device 10 is connected to the sub-node device 301, and the port switch 501 is connected to a backbone optical fiber that leads to the second node device 20. The sub-node device includes a first light-receiving module and a second light-receiving module. It can be understood that each sub-node device includes two light-receiving modules, which are respectively light-receiving module 1 and light-receiving module 2 .

In specific implementation, the port switch 501 is used to receive the first signal light from the first node device 10 and transmit the first signal light to the coupling optical splitter 502. The coupling optical splitter 502 is used to split the first signal light into a third optical signal. The second signal light and the third signal light are sent to the port switch 501. The port switch 501 is used to send the second signal light to the second node device 20 and to the child node device. The first receiving and receiving light module sends the third signal light.

The port switch 501 is used to receive the fourth signal light from the second node device 20 and transmit the fourth signal light to the coupling optical splitter 502. The coupling optical splitter 502 is used to split the fourth signal light into a fifth signal light and The sixth signal light is sent to the port switch 501, and the port switch 501 is used to send the sixth signal light to the first node device 10, and to the second transceiver of the child node device. The optical module sends the fifth signal light, wherein the optical power ratio of the second signal light and the third signal light is a first ratio, the optical power ratio of the sixth signal light and the fifth signal light is a second ratio, and the first ratio is equal to The second proportions are reciprocal to each other.

Exemplarily, in the first preset state, during downlink communication, please refer to Figure 19B. Figure 19B is a schematic diagram of yet another signal light transmission proposed by an embodiment of the present application. For the signal light transmission, please refer to the above-mentioned Figure 14B. The relevant descriptions in will not be repeated here. In the second preset state, during downlink communication, please refer to Figure 19C. Figure 19C is a schematic diagram of another signal optical transmission provided by an embodiment of the present application, for example, between the child node device 301 and the child node device 302. When the optical fiber is broken, the first node device 10 sends the first signal light with a central wavelength of λ ₁ in two directions. The first node device 10 can send the first signal light with a central wavelength of λ ₁ to the child node device 301. The transmission direction of the first signal light is from the first node device 10 to the sub-node device 301. At the sub-node device 301, a part of the signal power is split through the coupling splitter 502 to the receiving and transmitting module 1 of the sub-node device to complete downlink communication, and At the same time, the first node device 10 can send the first signal light with a central wavelength of λ ₁ to the child node device 302 through the second node device 20. The transmission direction of the first signal light is from the child node device 30N to the child node device 303 to the child node device 302. The node device 302 splits a portion of the signal power at each sub-node device through the coupling splitter 502 to the light-transmitting module 1 of the sub-node device to complete downlink communication. At this time, the second node device 20 sends the fourth signal light with a central wavelength of λ ₂ in two directions. The second node device 20 sends the fourth signal light with a central wavelength of λ _2. The transmission direction of the fourth signal light is given by From the node device 30N to the child node device 303 to the child node device 302, a part of the signal power is split out through the coupling splitter 502 at each child node device to the transceiver and light module 2 of the child node device to complete downlink communication, and the remaining signal power is Then continue to transmit to the next child node device; at the same time, the second node device 20 can send the fourth signal light with a central wavelength of λ ₂ to the child node device 301 via the first node device 10, and the child node device 301 splits the light through coupling. The transmitter 502 distributes a part of the signal power to the transceiver and light module 2 of the sub-node device 301 to complete downlink communication. In summary, the transceiver and optical module 1 in each sub-node device is used to receive the first signal light with a central wavelength of λ ₁ from the first node device 10 and to send uplink signals to the first node device 10; the transceiver and transceiver modules in each sub-node device are The optical module 2 is used to receive the fourth signal light with a central wavelength of λ ₂ from the second node device 20 and to send an uplink signal to the second node device 20 .

It should be noted that in the second preset state, for example, the optical fiber between the sub-node device 301 and the sub-node device 302 is broken. For the left side of the fiber break point, for example, the sub-node device 301, the sub-node device 301 receives the first signal light from the first node device 10 through the port switch 501 and transmits it to the coupling optical splitter 502. The coupling optical splitter 502 The first signal light is split into a second signal light and a third signal light, and the second signal light and the third signal light are sent to the port switch 501, which is used to send the second signal light to the sub-node device 302. signal light, and sends the third signal light to the light-transmitting module 1 in the child node device 301. However, due to fiber breakage between the sub-node device 302 and the sub-node device 301, the second signal light cannot be sent to the sub-node device 302. Correspondingly, the child node device 301 receives the fourth signal light from the second node device 20 through the port switch 501 and transmits it to the coupling optical splitter 502, which splits the fourth signal light into a fifth signal light and a The sixth signal light is sent to the port switch 501, and the port switch 501 is used to send the fifth signal light to the sub-node device 302, and to the transceiver in the sub-node device 301. The optical module 2 sends the sixth signal light. However, due to fiber breakage between the child node device 302 and the child node device 301, the fifth signal light cannot be sent to the child node device 302. Wherein, the ratio of the power of the third signal light and the second signal light is the same as the ratio of the power of the sixth signal light and the fifth signal light, for example, 1:9, which can be understood as: in the second preset In this state, for the sub-node device on the left side of the fiber break point, the splitting ratio of the first signal light and the fourth signal light is the same, that is, the power ratio of the optical signals of the light-receiving module 1 and the backbone fiber in the sub-node device 301 , is the same as the power ratio of the optical signals of the receiving and receiving optical module 2 and the trunk optical fiber.

In the second preset state, for the right side of the fiber break point, for example, the sub-node device 30N, the sub-node device 30N receives the first signal light from the first node device 10 through the port switch 501 and transmits it to the coupling optical splitter. 502. The coupling splitter 502 is used to split the first signal light into the second signal light and the third signal light, and send the second signal light and the third signal light to the port switch 501 respectively. The port switch 501 is used to The second signal light is emitted to the sub-node device 30(N-1), and the third signal light is emitted to the light-receiving and receiving module 1 in the sub-node device 30N. Correspondingly, the sub-node device 30N receives the fourth signal light from the second node device 20 through the port switch 501 and transmits it to the coupling optical splitter 502. The coupling optical splitter 502 is used to split the fourth signal light into a fifth signal light and The sixth signal light is sent to the port switch 501 respectively, and the port switch 501 is used to transmit the fifth signal light to the child node device 30 (N-1), and to the child node device 30 (N-1). The light-receiving module 2 in the device 30N emits the sixth signal light. Wherein, the ratio of the power of the third signal light and the second signal light is the same as the ratio of the power of the sixth signal light and the fifth signal light, for example, 1:9, which can be understood as: in the second preset In this state, for the sub-node device on the right side of the fiber break point, the splitting ratio of the first signal light and the fourth signal light is the same, that is, the power ratio of the optical signals of the light-receiving module 1 and the trunk fiber in the sub-node device 30N , is the same as the power ratio of the optical signals of the receiving and receiving optical module 2 and the trunk optical fiber. For example, in the second preset state, the power ratio of the optical signals of the light-transmitting module 1 and the backbone fiber in the leaf node 30 (N-1) is the same as the power ratio of the optical signals of the light-transmitting module 2 and the backbone fiber, for example is 2:8; the power ratio of the optical signals of the light-transmitting module 1 and the trunk fiber in the leaf node 30 (N-2) is the same as the power ratio of the optical signals of the light-transmitting module 2 and the trunk fiber, for example, 3:7; By analogy, the power ratio of the optical signals of the light-transmitting module 1 and the trunk fiber in the leaf node 303 is the same as the power ratio of the optical signals of the light-transmitting module 2 and the trunk fiber, for example, 7:3; the light-receiving module in the leaf node 302 The power ratio of the optical signal between 1 and the trunk optical fiber is the same as the power ratio of the optical signal between the receiving and receiving optical module 2 and the trunk optical fiber, for example, 8:2.

Further, please refer to FIG. 20A , which is a schematic diagram of another specific structure of a protection switching device 50 provided by an embodiment of the present application. The protection switching device 50 includes a port switch 501 and a coupling splitter 502. The port switch 501 includes a first port 1, a second port 2, a third port 3, a fourth port 4, a fifth port 5 and a sixth port 6. , seventh port 7 and eighth port 8, the coupling splitter 502 includes a ninth port 9, a tenth port 10, an eleventh port 11 and a twelfth port 12, where the fifth port 5 is in phase with the ninth port 9 The sixth port 6 is connected to the tenth port 10, the seventh port 7 is connected to the eleventh port 11, and the eighth port 8 is connected to the twelfth port 12. Among them, taking the protection switching device deployed in the sub-node device 301 as an example, the first port 1 is connected to the first node device 10, the second port 2 is connected to the backbone optical fiber, and the backbone optical fiber leads to the second node device 20. The third port 3 is connected to the first light-transmitting module of the child node device 301 , for example, the light-transmitting module 1 , and the fourth port 4 is connected to the second light-transmitting module of the child node device 301 , for example, the light-transmitting module 2 . When protection switching devices are deployed in other sub-node devices, the connection of ports can be analogous to that of the sub-node device 301, which will not be described in detail in the embodiment of this application.

In the specific implementation, please refer to Figure 20B. Figure 20B is a schematic diagram of the connection relationship between ports in another port switch provided by an embodiment of the present application. The first port 1 and the fifth port 5 are connected, and the second port 2 It is connected to the sixth port 6, and the third port 3 is connected to the seventh port 7. The port switch 501 is used to receive the first signal light through the first port 1 and transmit the first signal light to the coupling optical splitter 502 through the fifth port 5. The coupling optical splitter 502 is used to split the first signal light into the second signal light. and the third signal light, and sends the second signal light and the third signal light to the sixth port 6 and the seventh port 7 of the port switch 501 respectively. The port switch 501 receives the second signal light through the sixth port 6 and The second signal light is emitted to the second node device 20 through the second port 2, the third signal light is received through the seventh port 7, and the third signal light is emitted to the first receiving and receiving light module in the child node device through the third port 3. Wherein, the first signal light comes from the first node device 10 .

Please refer to Figure 20C. Figure 20C is a schematic diagram of the connection relationship between ports in another port switch provided by an embodiment of the present application. The first port 1 and the fifth port 5 are connected, and the second port 2 and the seventh port are connected. 7-phase connection, the fourth port 4 and the eighth port 8 are connected. port The switch 501 is used to receive the fourth signal light through the second port 2 and transmit the fourth signal light to the coupling optical splitter 502 through the seventh port 7. The coupling optical splitter 502 is used to split the fourth signal light into a fifth signal light and a The sixth signal light is sent to the eighth port 8 and the fifth port 5 of the port switch 501 respectively. The port switch 501 receives the sixth signal light through the fifth port 5 and passes through the sixth signal light. The first port 1 emits the sixth signal light to the first node device 10 , receives the fifth signal light through the eighth port 8 , and emits the fifth signal light through the fourth port 4 to the second receiving and receiving light module in the child node device. Among them, the fourth signal light comes from the second node device 20 .

The above-mentioned FIG. 20B and FIG. 20C show that in the first preset state, the first node device 10 sends the first signal light, the transmission situation of the first signal light, and the second node device 20 sends the fourth signal light. , the transmission situation of the fourth signal light. Next, please refer to Figure 20D and Figure 20E. Figure 20D and Figure 20E are schematic diagrams of the connection relationship between ports in another port switch provided by an embodiment of the present application. Figure 20D and Figure 20E show that in the second In the default state, the transmission situation of the first signal light on the left side of the fiber-broken node, and the transmission situation of the fourth signal light on the left side of the fiber-broken node.

Please refer to Figure 20D. Figure 20D is a schematic diagram of the connection relationship between ports in another port switch provided by an embodiment of the present application. The first port 1 and the fifth port 5 are connected, and the second port 2 and the sixth port are connected. 6 phases are connected, and the third port 3 and the seventh port 7 are connected. The port switch 501 is used to receive the first signal light through the first port 1 and transmit the first signal light to the coupling splitter 502 through the fifth port 5. The coupling splitter 502 is used to split the first signal light into the second signal light. and the third signal light, and sends the second signal light and the third signal light to the sixth port 6 and the seventh port 7 of the port switch 501 respectively. The port switch 501 receives the second signal light through the sixth port 6 and The second signal light is emitted to the second node device 20 through the second port 2, the third signal light is received through the seventh port 7, and the third signal light is emitted to the first receiving and receiving light module in the child node device through the third port 3. Wherein, the first signal light comes from the first node device 10 . For example, as shown in FIG. 19C , the first node device 10 sends the first signal light to the child node device 301 .

Please refer to Figure 20E. Figure 20E is a schematic diagram of the connection relationship between ports in another port switch provided by an embodiment of the present application. The first port 1 and the fifth port 5 are connected, and the second port 2 and the sixth port are connected. 6 phases are connected, and the fourth port 4 and the seventh port 7 are connected. The port switch 501 is used to receive the fourth signal light through the first port 1 and to transmit the fourth signal light to the coupling optical splitter 502 through the fifth port 5. The coupling optical splitter 502 is used to split the fourth signal light into the fifth signal light. and the sixth signal light, and sends the fifth signal light and the sixth signal light to the sixth port 6 and the seventh port 7 of the port switch 501 respectively, and receives the fifth signal light through the sixth port 6 and passes through the second port. 2. Emit the fifth signal light to the second node device 20, receive the sixth signal light through the seventh port 7, and transmit the sixth signal light to the second receiving and receiving light module in the child node device through the fourth port 4. Among them, the fourth signal light comes from the second node device 20 . For example, as shown in FIG. 19C , the second node device 20 sends the fourth signal light to the child node device 301 through the first node device 10 .

The above-mentioned FIG. 20D and FIG. 20E show that, in the second preset state, the port connection state of the first signal light on the left side of the fiber-broken node and the port connection state of the fourth signal light on the left side of the fiber-broken node. Next, please refer to Figure 20F and Figure 20G. Figure 20F and Figure 20G are schematic diagrams of the connection relationship between ports in another port switch provided by an embodiment of the present application. Figure 20F and Figure 20G show that in the second In the preset state, the transmission situation of the first signal light on the right side of the fiber-broken node, and the transmission situation of the fourth signal light on the right side of the fiber-broken node.

Please refer to Figure 20F. Figure 20F is a schematic diagram of the connection relationship between ports in another port switch provided by an embodiment of the present application. The first port 1 and the eighth port 8 are connected, and the second port 2 and the sixth port are connected. 6-phase connection, the third port 3 and the fifth port 5 are connected. The port switch 501 is used to receive the first signal light through the second port 2 and transmit the first signal light to the coupling splitter 502 through the sixth port 6. The coupling splitter 502 is used to split the first signal light into the second signal light. and the third signal light, and sends the second signal light and the third signal light to the eighth port 8 and the fifth port 5 of the port switch 501 respectively. The port switch 501 receives the second signal light through the eighth port 8 and The second signal light is emitted to the first node device 10 through the first port 1, the third signal light is received through the fifth port 5, and the third signal light is emitted to the first receiving and receiving light module in the child node device through the third port 3; wherein , the first signal light comes from the first node device 10 . For example, as shown in FIG. 19C , the first node device 10 sends the first signal light to the child node device 30N through the second node device 20 .

Please refer to Figure 20G. Figure 20G is a schematic diagram of the connection relationship between ports in another port switch provided by an embodiment of the present application. The first port 1 and the fifth port 5 are connected, and the second port 2 and the seventh port are connected. 7-phase connection, the fourth port 4 and the eighth port 8 are connected. The port switch 501 is configured to receive the fourth signal light through the second port 2 and transmit the fourth signal light to the coupling optical splitter 502 through the seventh port 7. The coupling optical splitter 502 is used to split the fourth signal light into the fifth signal light. and the sixth signal light, and sends the fifth signal light and the sixth signal light to the fifth port 5 and the eighth port 8 of the port switch 501 respectively. The port switch 501 receives the fifth signal light through the fifth port 5 and The fifth signal light is emitted to the first node device 10 through the first port 1, the sixth signal light is received through the eighth port 8, and the sixth signal light is emitted to the second receiving and receiving light module in the child node device through the fourth port 4. Among them, the fourth signal light comes from the second node device 20 . For example, as shown in FIG. 19C , the second node device 20 sends the fourth signal light to the child node device 30N.

In the above implementation, the protection switching device can be implemented by a port switch based on a spatial optical path and a passive coupling splitter. The protection switching device has a simple structure and low cost. Using the protection switching device can reduce the protection of optical fiber links. Reduce the cost of the switching mechanism and improve its applicability. Moreover, through the architecture shown in Figure 19A, business traffic can be increased.

The structure of the port switch 501 will be further described below in conjunction with the foregoing content.

In a possible implementation, the above-mentioned port switch 501 includes a first optical path turning lens group. The first optical path turning lens group is used to establish a connection between the second port 2 and the sixth port 6 to facilitate the transmission of the second signal light. , and establish a connection between the third port 3 and the seventh port 7 to facilitate the transmission of the third signal light; the first optical path turning lens group is also used to establish a connection between the second port 2 and the seventh port 7 to facilitate the transmission of the fourth signal light. transmission.

Exemplarily, the first optical path turning lens group includes a filter plate 704 that transmits the second signal light and the third signal light and reflects the fourth signal light. For specific implementation, please refer to Figure 21, which is a schematic diagram of another optical path connection provided by an embodiment of the present application. As shown in (a) of FIG. 21 , the first port 1 is connected to the fifth port 5 , the second port 2 is connected to the sixth port 6 , and the third port 3 is connected to the seventh port 7 . Specifically, the port switch 501 is used to receive the first signal light through the first port 1 and transmit the first signal light to the coupling splitter 502 through the fifth port 5, wherein the first signal light does not pass through the filter 704, port The switch 501 receives the second signal light through the sixth port 6. The second signal light is transmitted through the filter 704 and sent to the second port 2 of the port switch 501. The port switch 501 transmits the signal light to the second node through the second port 2. The device 20 emits the second signal light, and the port switch 501 receives the third signal light through the seventh port 7. The third signal light is transmitted through the filter 704 and sent to the third port 3 of the port switch 501. The port switch 501 The third signal light is emitted to the first receiving and receiving light module in the sub-node device through the third port 3. As shown in (b) of FIG. 21 , the first port 1 is connected to the fifth port 5 , the second port 2 is connected to the seventh port 7 , and the fourth port 4 is connected to the eighth port 8 . Specifically, the port switch 501 is configured to receive the fourth signal light through the second port 2. The fourth signal light is reflected to the seventh port 7 of the port switch 501 through the filter 704, and the port switch 501 passes through the seventh port 7. The fourth signal light is emitted to the coupling splitter 502. The port switch 501 receives the sixth signal light through the fifth port 5. The sixth signal light does not pass through the filter 704. The port switch 501 transmits the signal light to the first node through the first port 1. The device 10 emits the sixth signal light, and the port switch 501 receives the fifth signal light through the eighth port 8. The fifth signal light does not pass through the filter 704. The port switch 501 transmits the second signal light to the sub-node device through the fourth port 4. The receiving and receiving light module emits the fifth signal light. It should be noted that the connection relationship between the ports in (a) and (b) of Figure 21 above corresponds to Figures 20B and 20C.

In a possible implementation, the above-mentioned port switch 501 includes a second optical path turning lens group. The second optical path turning lens group is used to disconnect and establish the connection between the fourth signal light at the second port 2 and the seventh port 7. The fifth signal light is connected at the second port 2 and the sixth port 6, the connection between the fifth signal light at the fourth port 4 and the eighth port 8 is disconnected, and the sixth signal light is established at the fourth port 4 and the seventh port. 7 connections.

Exemplarily, the second optical path turning lens group includes a filter plate 705 that transmits the third signal light and reflects the sixth signal light. For specific implementation, please refer to Figure 21, which is a schematic diagram of another optical path connection provided by an embodiment of the present application. As shown in (c) of FIG. 21 , the first port 1 is connected to the fifth port 5 , the second port 2 is connected to the sixth port 6 , and the third port 3 is connected to the seventh port 7 . The port switch 501 is configured to receive the first signal light through the first port 1 and transmit the first signal light to the coupling splitter 502 through the fifth port 5, wherein the first signal light does not pass through the filter 705. The port switch 501 The second signal light is received through the sixth port 6, and the second signal light does not pass through the filter 705. The port switch 501 sends the second signal light through the sixth port 6 to the second port 2 of the port switch 501. The port switch The switch 501 transmits the second signal light to the second node device 20 through the second port 2, the port switch 501 receives the third signal light through the seventh port 7, and the third signal light is transmitted through the filter 705 and sent to the port switch Through the third port 3 of 501, the port switch 501 transmits the third signal light to the first receiving and receiving light module in the child node device through the third port 3. As shown in (d) of FIG. 21 , the first port 1 and the fifth port 5 are connected, the second port 2 and the sixth port 6 are connected, and the fourth port 4 and the seventh port 7 are connected. The port switch 501 is configured to receive the fourth signal light through the first port 1 and transmit the fourth signal light to the coupling splitter 502 through the fifth port 5, wherein the fourth signal light does not pass through the filter 705. The port switch 501 The fifth signal light is received through the sixth port 6. The second signal light does not pass through the filter 705. The port switch 501 transmits the fifth signal light to the second node device 20 through the second port 2. The port switch 501 passes through the seventh port. Port 7 receives the sixth signal light, and the sixth signal light is reflected to the fourth port 4 through the filter 705. The port switch 501 transmits the sixth signal light to the second receiving and receiving light module in the child node device through the fourth port 4. Therefore, as known from (b) in Figure 21 , the fourth signal light received by the port switch 501 from the second port 2 is transmitted to the seventh port 7 through the first optical path turning lens group, as known from (d) in Figure 21 , the port switch 501 receives the fifth signal light from the sixth port 6 and transmits it to the second port 2. Therefore, the second optical path turning lens group is used to disconnect the fourth signal light at the second port 2 and the seventh port 7. And establish a connection between the fifth signal light at the second port 2 and the sixth port 6; as known from (b) in Figure 21, the port switch 501 transmits the fifth signal light received from the eighth port 8 to the fourth port 4 , as known from (d) in Figure 21, the port switch 501 receives the sixth signal light from the seventh port 7 and transmits it to the fourth port 4 through the second optical path turning lens group; therefore, the second optical path turning lens group is used to break Open the connection between the fifth signal light at the fourth port 4 and the eighth port 8 and establish the connection between the sixth signal light at the fourth port 4 and the seventh port 7 . It should be noted that the connection methods of the ports in (c) and (d) of Figure 21 above correspond to Figures 20D and 20E.

In yet another possible implementation, the above-mentioned port switch 501 includes a third optical path turning lens group, and the third optical path turning lens group is used to disconnect the first signal light at the first port 1 and the fifth port 5, and establish a connection between the second signal light at the first port 1 and the eighth port 8 The connection is used to disconnect the third signal light at the third port 3 and the seventh port 7 and establish the connection between the third signal light at the third port 3 and the fifth port 5 .

Exemplarily, the third optical path turning lens group includes a filter plate 706, a filter plate 707 and a filter plate 708. The filter plate 706 reflects the second signal light, reflects the third signal light, transmits the fifth signal light, and filters The plate 707 transmits the first signal light and reflects the fourth signal light. The filter plate 708 reflects the second signal light and transmits the sixth signal light. Please refer to Figure 21, which is a schematic diagram of yet another optical path connection provided by an embodiment of the present application. As shown in (e) of FIG. 21 , the first port 1 is connected to the eighth port 8 , the second port 2 is connected to the sixth port 6 , and the third port 3 is connected to the fifth port 5 . The port switch 501 is used to receive the first signal light through the second port 2, and the first signal light is transmitted to the sixth port 6 through the filter 707. The port switch 501 is used to couple the optical splitter 502 through the sixth port 6. The first signal light is emitted, and the port switch 501 is used to receive the second signal light through the eighth port 8. The second signal light is reflected by the filter 708 to the filter 706 and then reflected to the first port 1. The port switch 501 passes The first port 1 emits the second signal light to the first node device 10. The port switch 501 receives the third signal light through the fifth port 5. The third signal light is reflected to the third port 3 through the filter 706. The port switch 501 501 transmits the third signal light to the first receiving and receiving light module in the sub-node device through the third port 3; as shown in (f) in Figure 21, the first port 1 and the fifth port 5 are connected, and the second port 2 and the fifth port 5 are connected. The seventh port 7 is connected to each other, and the fourth port 4 and the eighth port 8 are connected to each other. The port switch 501 is used to receive the fourth signal light through the second port 2. The fourth signal light is reflected to the seventh port 7 through the filter 707. The port switch 501 is used to transmit to the coupling splitter 502 through the seventh port 7. The fourth signal light, the port switch 501 receives the fifth signal light through the fifth port 5, and the fifth signal light is transmitted to the first port 1 through the filter 706. The port switch 501 is used to transmit the signal light to the first node through the first port 1. The device 10 emits the fifth signal light, and the port switch 501 is used to receive the sixth signal light through the eighth port 8. The sixth signal light is transmitted to the fourth port 4 through the filter 708, and the port switch 501 is used to pass through the fourth port. 4. Send the sixth signal light to the second receiving and receiving light module in the child node device. Therefore, as known from (a) in Figure 21, the port switch 501 receives the first signal light from the first port 1 and transmits it to the fifth port 5. As known from (e) in Figure 21, the port switch 501 uses After receiving the second signal light through the eighth port 8, the second signal light is reflected by the filter 708 to the filter 706 and then reflected to the first port 1. Therefore, the third optical path turning lens group is used to cut off the first signal light. The connection between the first port 1 and the fifth port 5, and establishes the connection of the second signal light between the first port 1 and the eighth port 8; as known from (a) in Figure 21, the port switch 501 switches from the seventh port 7 receives the third signal light and transmits it to the third port 3. As known from (e) in Figure 21, the port switch 501 is used to receive the third signal light through the fifth port 5, and the third signal light passes through the filter. 706 is reflected to the third port 3. Therefore, the third optical path turning lens group is used to disconnect the third signal light at the third port 3 and the seventh port 7, and establish the connection between the third signal light at the third port 3 and the seventh port 7. Five port 5 connections. It should be noted that the connection methods of the ports in (e) and (f) of Figure 21 above correspond to Figures 20F and 20G.

It should be noted that the foregoing description of the structure of the port switch 501 is only exemplary. In actual implementation, the port switch 501 can also be implemented using a 4*4 optical switch or other structures. This is not the case in the embodiment of this application. limited.

It should be understood that the port switch 501 can realize optical path connection through the optical path turning lens group, that is, the protection switching process can be realized by mechanically moving spatial optical elements. The technology involved is relatively mature, and the spatial optical path insertion loss is small and the extinction ratio is high.

Please refer to Figure 22. Figure 22 is a circuit break protection method provided by an embodiment of the present application. The method includes but is not limited to the following steps:

Step S2201: Determine that the optical communication system is in a first preset state.

Specifically, the first preset state may mean that the communication link is normal; it may be determined by the controller of the optical communication system that the optical communication system is in the first preset state. What needs to be added here is that the controller can be a reuse of an existing controller in the optical communication system, or it can be a new controller in the optical communication system. The control can be implemented specifically as a frame-type componentized system or as a system-on-a-chip (SOC) composed of a single integrated chip, which is not specifically limited in this application.

Step S2202: Receive the first signal light from the first node device through the port switch, and transmit the first signal light to the coupling optical splitter.

In a possible implementation, under the architecture of the optical communication system 100 shown in Figure 1, when the port switch is shown in Figure 3A or Figure 6A, the first port of the port switch receives the signal from the first node device. The first signal light is emitted to the coupling splitter 502 through the fourth port.

In a possible implementation, under the architecture of the optical communication system 100 shown in Figure 9A, when the port switch, as shown in Figure 10A, receives the first signal from the first node device through the first port of the port switch The light is emitted to the coupling splitter 502 through the fifth port.

Step S2203: Split the first signal light into a second signal light and a third signal light through a coupling splitter, and send the second signal light and the third signal light to the port switch.

In a possible implementation, under the architecture of the optical communication system 100 shown in Figure 1, when the port switch is shown in Figure 3A or Figure 6A, After splitting the first signal light into the second signal light and the third signal light through the coupling splitter, the second signal light and the third signal light are sent to the fifth port and the sixth port of the port switch.

In yet another possible implementation, under the architecture of the optical communication system 100 shown in Figure 9A, when the port switch is shown in Figure 10A, the first signal light is split into the second signal light and the second signal light through the coupling splitter. After three signal lights, the second signal light and the third signal light are sent to the sixth port and the seventh port of the port switch.

Step S2204: Send the second signal light to the second node device through the port switch, and send the third signal light to the child node device.

In a possible implementation, under the architecture of the optical communication system 100 shown in Figure 1, when the port switch is shown in Figure 3A or Figure 6A, the second signal light is received through the fifth port of the port switch and passed through The second port emits the second signal light to the second node device, receives the third signal light through the sixth port of the port switch, and emits the third signal light to the sub-node device through the third port.

In a possible implementation, under the architecture of the optical communication system 100 shown in Figure 9A, when the port switch is shown in Figure 10A, the second signal light is received through the sixth port of the port switch and passed through the second port. The second signal light is emitted to the second node device, the third signal light is received through the seventh port of the port switch, and the third signal light is emitted to the child node device through the third port.

Step S2205: Determine that the optical communication system is in the second preset state.

Specifically, the second preset state may refer to a failure of the communication link; it may be determined by the controller of the optical communication system that the optical communication system is in the second preset state.

Step S2206: Receive the first signal light from the second node device through the port switch, and transmit the first signal light to the coupling optical splitter.

In a possible implementation, under the architecture of the optical communication system 100 shown in Figure 1, when the port switch is shown in Figure 3A, the port switch 501 is used to receive the first signal light through the second port and pass the first signal light through the second port. The four-port emits the first signal light to the coupling splitter 502.

In yet another possible implementation, under the architecture of the optical communication system 100 shown in Figure 1, when the port switch is as shown in Figure 6A, the port switch 501 is used to receive the first signal light through the second port and pass The sixth port emits the first signal light to the coupling splitter 502. Of course, there are other port connection methods. For details, please refer to the relevant descriptions in Figure 6D and Figure 6E.

In a possible implementation, under the architecture of the optical communication system 100 shown in Figure 9A, when the port switch is shown in Figure 10A, the first signal light is received through the second port in the port switch 501 and passed through the third port. The seven ports emit the first signal light to the coupling splitter 502. Of course, there are other port connection methods. For details, please refer to the relevant descriptions in Figure 10D, Figure 10E and Figure 10F.

Step S2207: Split the first signal light into the second signal light and the third signal light through the coupling splitter, and send the second signal light and the third signal light to the port switch.

In a possible implementation, under the architecture of the optical communication system 100 shown in Figure 1, when the port switch is shown in Figure 3A, the first signal light is split into the second signal light and the third signal light through the coupling splitter. After the signal light, the second signal light and the third signal light are sent to the fifth port and the sixth port of the port switch.

In yet another possible implementation, under the architecture of the optical communication system 100 shown in Figure 1, when the port switch is shown in Figure 6A, the first signal light is split into the second signal light and the second signal light through the coupling splitter. After the three signal lights, the second signal light and the third signal light are sent to the seventh port and the fourth port of the port switch. Of course, there are other port connection methods. For details, please refer to the relevant descriptions in Figure 6D and Figure 6E .

In a possible implementation, under the architecture of the optical communication system 100 shown in Figure 9A, when the port switch is shown in Figure 10A, the first signal light is split into the second signal light and the third signal light through the coupling splitter. After the signal light, the second signal light and the third signal light are sent to the eighth port and the fifth port of the port switch. Of course, there are other port connection methods. For details, please refer to Figure 10D, Figure 10E and Figure 10F related descriptions.

Step S2208: Send the third signal light to the first node device through the port switch, and send the second signal light to the child node device.

Specifically, in one possible implementation, under the architecture of the optical communication system 100 shown in Figure 1, when the port switch is as shown in Figure 3A, the third signal light is received through the sixth port of the port switch and passed through The first port emits third signal light to the first node device, receives the second signal light through the fifth port, and emits the second signal light to the child node device through the third port.

In another possible implementation, under the architecture of the optical communication system 100 shown in Figure 1, when the port switch is shown in Figure 6A, the third signal light is received through the fourth port of the port switch and passed through the first The port emits the third signal light to the first node device, receives the second signal light through the seventh port, and emits the second signal light to the sub-node device through the third port. Of course, there are other port connection methods. For details, please refer to Figure 6D and related descriptions in Figure 6E.

In a possible implementation, under the architecture of the optical communication system 100 shown in Figure 9A, when the port switch is shown in Figure 10A, the third signal light is received through the fifth port of the port switch and passed through the first port. Transmitting the third signal light to the first node device, receiving the second signal light through the eighth port and transmitting the second signal light to the sub-node device through the fourth port. Of course, there are other port connection methods. For details, please refer to Figure 10D , related descriptions in Figure 10E and Figure 10F.

In the method described in Figure 22, the protection switching device can be implemented through a port switch based on a spatial optical path and a passive coupling splitter. The protection switching device has a simple structure and low cost. Using this protection switching device can reduce the cost of optical fiber. Reduce the cost of the link protection switching mechanism and improve its applicability.

Please refer to Figure 23. Figure 23 is a circuit break protection method provided by an embodiment of the present application. The method includes but is not limited to the following steps:

Step S2301: Receive the first signal light from the first node device through the port switch, and transmit the first signal light to the coupling optical splitter.

In a possible implementation, under the architecture of the optical communication system 100 shown in Figure 14A, when the port switch is shown in Figure 15A, the port switch 501 is used to receive the first signal light through the first port and pass the first signal light through the first port. The five-port emits the first signal light to the coupling splitter 502.

In yet another possible implementation, under the architecture of the optical communication system 100 shown in Figure 19A, when the port switch is as shown in Figure 20A, the port switch 501 is used to receive the first signal light through the first port and pass The fifth port emits the first signal light to the coupling splitter 502 .

Step S2302: Split the first signal light into the second signal light and the third signal light through the coupling splitter, and send the second signal light and the third signal light to the port switch.

In a possible implementation, under the architecture of the optical communication system 100 shown in Figure 14A, when the port switch is shown in Figure 15A, the first signal light is split into the second signal light and the third signal light through the coupling splitter. After the signal light, the second signal light and the third signal light are sent to the sixth port and the seventh port of the port switch.

In yet another possible implementation, under the architecture of the optical communication system 100 shown in Figure 19A, when the port switch is shown in Figure 20A, the first signal light is split into the second signal light and the second signal light through the coupling splitter. After the three signal lights, the second signal light and the third signal light are sent to the sixth port and the seventh port of the port switch.

Step S2303: Send the second signal light to the second node device through the port switch, and send the third signal light to the first receiving and receiving light module in the child node device.

In a possible implementation, under the architecture of the optical communication system 100 shown in Figure 14A, when the port switch is shown in Figure 15A, the second signal light is received through the sixth port of the port switch and transmitted to the second port through the second port. The second node device emits the second signal light, receives the third signal light through the seventh port, and emits the third signal light through the third port to the first receiving and receiving light module in the child node device.

In yet another possible implementation, under the architecture of the optical communication system 100 shown in Figure 19A, when the port switch is shown in Figure 20A, the second signal light is received through the sixth port of the port switch and passed through the second port. The second signal light is emitted to the second node device, the third signal light is received through the seventh port, and the third signal light is emitted to the first receiving and receiving light module in the child node device through the third port.

Step S2304: Receive the fourth signal light from the second node device through the port switch, and transmit the fourth signal light to the coupling optical splitter.

In a possible implementation, under the architecture of the optical communication system 100 shown in Figure 14A, when the port switch is shown in Figure 15A, the port switch 501 is used to receive the fourth signal light through the second port and pass it through the third port. The seven-port emits the fourth signal light to the coupling splitter 502.

In a possible implementation, under the architecture of the optical communication system 100 shown in Figure 19A, when the port switch is as shown in Figure 20A, the port switch 501 is used to receive the fourth signal light through the second port and pass the fourth signal light through the second port. The seven-port emits the fourth signal light to the coupling splitter 502.

Step S2305: Split the fourth signal light into the fifth signal light and the sixth signal light through the coupling splitter, and send the fifth signal light and the sixth signal light to the port switch.

In a possible implementation, under the architecture of the optical communication system 100 shown in Figure 14A, when the port switch is shown in Figure 15A, the fourth signal light is split into the fifth signal light and the sixth signal light through the coupling splitter. signal light, and sends the fifth signal light and the sixth signal light to the eighth port and the fifth port of the port switch.

In yet another possible implementation, under the architecture of the optical communication system 100 shown in Figure 19A, when the port switch is shown in Figure 20A, the fourth signal light is split into the fifth signal light and the fifth signal light through the coupling splitter. six signal lights, and sends the fifth signal light and the sixth signal light to the eighth port and the fifth port of the port switch.

Step S2306: Send the sixth signal light to the first node device through the port switch, and send the fifth signal light to the second receiving and receiving light module in the child node device.

Specifically, the optical power ratio between the second signal light and the third signal light is a first ratio, the optical power ratio between the sixth signal light and the fifth signal light is a second ratio, and the first ratio and the second ratio are reciprocals of each other.

In a possible implementation, under the architecture of the optical communication system 100 shown in Figure 14A, when the port switch is shown in Figure 15A, the port switch receives the sixth signal light through the fifth port and transmits it to the first port through the fifth port. The first node device emits the sixth signal light, receives the fifth signal light through the eighth port, and transmits the fifth signal light to the second receiving and receiving light module in the child node device through the fourth port.

In yet another possible implementation, under the architecture of the optical communication system 100 shown in Figure 19A, when the port switch is shown in Figure 20A, The port switch receives the sixth signal light through the fifth port and transmits the sixth signal light to the first node device through the first port, receives the fifth signal light through the eighth port, and transmits and receives the second signal light to the child node device through the fourth port. The optical module emits fifth signal light.

In the method described in Figure 23, the protection switching device can be implemented through a port switch based on a spatial optical path and a passive coupling splitter. The protection switching device has a simple structure and low cost. Using this protection switching device can reduce the cost of optical fiber. Reduce the cost of the link protection switching mechanism and improve its applicability.

It can be understood that the processor in the embodiment of the present application can be a central processing unit (Central Processing Unit, CPU), or other general-purpose processor, digital signal processor (Digital Signal Processor, DSP), or application specific integrated circuit. (Application Specific Integrated Circuit, ASIC), Field Programmable Gate Array (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. A general-purpose processor can be a microprocessor or any conventional processor.

The method steps in the embodiments of the present application can be implemented by hardware or by a processor executing software instructions. Software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory In memory, register, hard disk, mobile hard disk, CD-ROM or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor such that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and storage media may be located in an ASIC. Additionally, the ASIC can be located in the base station or terminal. Of course, the processor and the storage medium may also exist as discrete components in the base station or terminal.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are executed in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, a network device, a user equipment, or other programmable device. The computer program or instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer program or instructions may be transmitted from a website, computer, A server or data center transmits via wired or wireless means to another website site, computer, server, or data center. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center that integrates one or more available media. The available media may be magnetic media, such as floppy disks, hard disks, and tapes; optical media, such as digital video optical disks; or semiconductor media, such as solid-state hard drives. The computer-readable storage medium may be volatile or nonvolatile storage media, or may include both volatile and nonvolatile types of storage media.

In the various embodiments of this application, if there is no special explanation or logical conflict, the terms and/or descriptions between different embodiments are consistent and can be referenced to each other. The technical features in different embodiments are based on their inherent Logical relationships can be combined to form new embodiments.

In the description of this application, words such as "first", "second", "S2201", or "S2202" are only used for the purpose of distinguishing descriptions and making context easier. The different sequence numbers themselves do not have specific technical meanings. , cannot be understood as indicating or implying the relative importance, nor can it be understood as indicating or implying the execution order of operations. The execution order of each process should be determined by its function and internal logic.

The term "and/or" in this application is just an association relationship describing related objects, indicating that there can be three relationships. For example, "A and/or B" can mean: A exists alone, A and B exist simultaneously, alone There are three cases of B, where A and B can be singular or plural. In addition, the character "/" in this article indicates that the related objects are an "or" relationship.

In this application, "transmission" may include the following three situations: sending of data, receiving of data, or sending of data and receiving of data. In this application, "data" may include service data and/or signaling data.

The terms "comprising" or "having" and any variations thereof in this application are intended to cover non-exclusive inclusions, for example, a process/method that includes a series of steps, or a system/product/equipment that includes a series of units, and is not necessarily limited to clarity. may include other steps or elements not expressly listed or inherent to the process/method/product/apparatus.

In the description of this application, the number of nouns means "singular noun or plural noun", that is, "one or more", unless otherwise specified. "At least one" means one or more. "Including at least one of the following: A, B, C." means it can include A, or B, or C, or A and B, or A and C, or B and C, or A, B and C. Among them, A, B, and C can be single or multiple.

Claims (19)

A protection switching device, characterized in that it includes a port switch and a coupling optical splitter. The port switch is connected to the coupling optical splitter. The port switch is connected to a first node device, a second node device and a sub-node respectively. Devices are connected; In the first preset state, the port switch is used to receive the first signal light from the first node device and transmit the first signal light to the coupling optical splitter, and the coupling optical splitter is used to The first signal light is split into a second signal light and a third signal light, and the second signal light and the third signal light are sent to the port switch, where the port switch is used to The second node device sends the second signal light and sends the third signal light to the child node device; In the second preset state, the port switch is used to receive the first signal light from the second node device and transmit the first signal light to the coupling optical splitter. The device is used to split the first signal light into the second signal light and the third signal light, and send the second signal light and the third signal light to the port switch, the The port switch is configured to send the third signal light to the first node device and send the second signal light to the child node device. The device according to claim 1, wherein the port switch includes a first port, a second port, a third port, a fourth port, a fifth port and a sixth port, and the coupling optical splitter includes a third port. Seven ports, an eighth port and a ninth port, the fourth port is connected to the seventh port, the fifth port is connected to the eighth port, the sixth port is connected to the ninth port connected; In the first preset state, the port switch is configured to receive the first signal light through the first port and transmit the first signal light to the coupling optical splitter through the fourth port, The second signal light is received through the fifth port and transmitted to the second node device through the second port. The third signal light is received through the sixth port and transmitted through The third port emits the third signal light to the sub-node device; In the second preset state, the port switch is configured to receive the first signal light through the second port and transmit the first signal light to the coupling splitter through the fourth port, The third signal light is received through the sixth port and transmitted to the first node device through the first port. The second signal light is received through the fifth port and transmitted through The third port emits the second signal light to the child node device. The device according to claim 2, wherein the port switch includes an optical path turning lens set; In the second preset state, the optical path turning lens set is used to disconnect the first port from the fourth port and establish a connection from the first port to the sixth port. Open the connection between the second port and the fifth port and establish the connection between the second port and the fourth port, disconnect the connection between the third port and the sixth port and establish the third port. The connection between the third port and the fifth port. The device according to claim 1, wherein the port switch includes a first port, a second port, a third port, a fourth port, a fifth port, a sixth port and a seventh port, and the coupling The optical splitter includes an eighth port, a ninth port, a tenth port and an eleventh port, the fourth port is connected to the eighth port, the fifth port is connected to the ninth port, the The sixth port is connected to the tenth port, and the seventh port is connected to the eleventh port; In the first preset state, the port switch is configured to receive the first signal light through the first port and transmit the first signal light to the coupling optical splitter through the fourth port, The second signal light is received through the fifth port and transmitted to the second node device through the second port. The third signal light is received through the sixth port and transmitted through The third port emits the third signal light to the sub-node device; In the second preset state, the port switch is configured to receive the first signal light through the second port and transmit the first signal light to the coupling optical splitter through the sixth port, The third signal light is received through the fourth port and transmitted to the first node device through the first port. The second signal light is received through the seventh port and transmitted through The third port emits the second signal light to the child node device. The device according to claim 1, wherein the port switch includes a first port, a second port, a third port, a fourth port, a fifth port, a sixth port, a seventh port and an eighth port. , the coupling optical splitter includes a ninth port, a tenth port, an eleventh port and a twelfth port, the fifth port is connected to the ninth port, the sixth port is connected to the tenth port are connected, the seventh port is connected to the eleventh port, and the eighth port is connected to the twelfth port; In the first preset state, the port switch is configured to receive the first signal light through the first port and pass the fifth signal light through the first port. The port emits the first signal light to the coupling optical splitter, receives the second signal light through the sixth port, and emits the second signal light to the second node device through the second port, Receive the third signal light through the seventh port and transmit the third signal light to the child node device through the third port; In the second preset state, the port switch is configured to receive the first signal light through the second port and transmit the first signal light to the coupling splitter through the seventh port, The third signal light is received through the fifth port and transmitted to the first node device through the first port. The second signal light is received through the eighth port and transmitted through The fourth port emits the second signal light to the child node device. A protection switching device, characterized in that it includes a port switch and a coupling optical splitter. The port switch is connected to the coupling optical splitter. The port switch is respectively connected to a first node device, a second node device and a sub-unit. Node devices are connected, and the sub-node devices include a first light-receiving module and a second light-receiving module; The port switch is used to receive the first signal light from the first node device and transmit the first signal light to the coupling optical splitter, and the coupling optical splitter is used to split the first signal light into a second signal light and a third signal light, and send the second signal light and the third signal light to the port switch, where the port switch is used to send the second signal light to the second node device. the second signal light, and sends the third signal light to the first transceiver and light module in the child node device; The port switch is used to receive the fourth signal light from the second node device and transmit the fourth signal light to the coupling optical splitter, and the coupling optical splitter is used to split the fourth signal light. into fifth signal light and sixth signal light, and send the fifth signal light and the sixth signal light to the port switch, the port switch is used to send the the sixth signal light, and sends the fifth signal light to the second receiving and receiving light module in the child node device, wherein the optical power ratio of the second signal light and the third signal light is a first ratio, and the The optical power ratio of the sixth signal light and the fifth signal light is a second ratio, and the first ratio and the second ratio are reciprocals of each other. The device of claim 6, wherein the port switch includes a first port, a second port, a third port, a fourth port, a fifth port, a sixth port, a seventh port and an eighth port. , the coupling optical splitter includes a ninth port, a tenth port, an eleventh port and a twelfth port, the fifth port is connected to the ninth port, the sixth port is connected to the tenth port are connected, the seventh port is connected to the eleventh port, and the eighth port is connected to the twelfth port; The port switch is configured to receive the first signal light through the first port, transmit the first signal light to the coupling splitter through the fifth port, and receive the first signal light through the sixth port. Two signal lights are emitted to the second node device through the second port, and the third signal light is received through the seventh port and sent to the child node through the third port. The first light-receiving module in the device emits the third signal light; The port switch is configured to receive the fourth signal light through the second port and transmit the fourth signal light to the coupling splitter through the seventh port, and receive the fourth signal light through the fifth port. Six signal lights are emitted to the first node device through the first port, and the fifth signal light is received through the eighth port and sent to the child node through the fourth port. The second light-receiving module in the device emits the fifth signal light. The device according to claim 7, wherein the port switch includes a first optical path turning lens group; The first optical path turning lens group is used to establish a connection between the second port and the sixth port to facilitate the transmission of the second signal light, and to establish a connection between the third port and the seventh port. To facilitate the transmission of the third signal light; The first optical path turning lens group is also used to establish a connection between the second port and the seventh port to facilitate the transmission of the fourth signal light. The device according to claim 7 or 8, characterized in that, The port switch is configured to receive the first signal light through the first port, transmit the first signal light to the coupling splitter through the fifth port, and receive the first signal light through the sixth port. Two signal lights are emitted to the second node device through the second port, and the third signal light is received through the seventh port and sent to the child node through the third port. The first light-receiving module in the device emits the third signal light; The port switch is configured to receive the fourth signal light through the first port and transmit the fourth signal light to the coupling splitter through the fifth port, and receive the fourth signal light through the sixth port. Five signal lights are sent to the second node device through the second port. The fifth signal light is emitted, the sixth signal light is received through the seventh port, and the sixth signal light is transmitted to the second receiving and receiving light module in the child node device through the fourth port. The device according to any one of claims 7-9, characterized in that, The port switch is configured to receive the first signal light through the second port, transmit the first signal light to the coupling optical splitter through the sixth port, and receive the first signal light through the eighth port. Two signal lights are emitted to the first node device through the first port, and the third signal light is received through the fifth port and sent to the child node through the third port. The first light-receiving module in the device emits the third signal light; The port switch is configured to receive the fourth signal light through the second port and transmit the fourth signal light to the coupling splitter through the seventh port, and receive the fourth signal light through the fifth port. Five signal lights are emitted to the first node device through the first port, and the sixth signal light is received through the eighth port and sent to the child node through the fourth port. The second light-receiving module in the device emits the sixth signal light. A circuit break protection method, characterized in that the circuit break protection method is suitable for an optical communication system. The optical communication system includes a port switch, a coupling optical splitter, a first node device, a second node device and a sub-node device, and the Methods include: Determining that the optical communication system is in a first preset state; Receive the first signal light from the first node device through the port switch and transmit the first signal light to the coupling optical splitter; Split the first signal light into a second signal light and a third signal light through the coupling splitter, and send the second signal light and the third signal light to the port switch; Send the second signal light to the second node device through the port switch, and send the third signal light to the child node device; Determining that the optical communication system is in a second preset state; Receive the first signal light from the second node device through the port switch and transmit the first signal light to the coupling optical splitter; The first signal light is split into the second signal light and the third signal light through the coupling splitter, and the second signal light and the third signal light are sent to the port switch device; The third signal light is sent to the first node device through the port switch, and the second signal light is sent to the child node device. The method according to claim 11, wherein the port switch includes a first port, a second port, a third port, a fourth port, a fifth port and a sixth port, and the coupling optical splitter includes a third port. Seven ports, an eighth port and a ninth port, wherein the fourth port is connected to the seventh port, the fifth port is connected to the eighth port, and the sixth port is connected to the Nine ports are connected; When it is determined that the optical communication system is in the first preset state, the first signal light is received through the first port in the port switch and transmitted to the coupling optical splitter through the fourth port. Emitting the first signal light, receiving the second signal light through the fifth port and transmitting the second signal light to the second node device through the second port, receiving the second signal light through the sixth port The third signal light is emitted to the sub-node device through the third port; When it is determined that the optical communication system is in the second preset state, the first signal light is received through the second port in the port switch and transmitted to the coupling optical splitter through the fourth port. Emitting the first signal light, receiving the third signal light through the sixth port and transmitting the third signal light to the first node device through the first port, receiving the third signal light through the fifth port The second signal light is emitted to the sub-node device through the third port. The method according to claim 12, characterized in that the port switch includes an optical path turning lens set; When it is determined that the optical communication system is in the second preset state, the connection between the first port and the fourth port is disconnected through the optical path turning lens group and the connection between the first port and the third port is established. Six-port connection, disconnect the second port from the fifth port and establish a connection between the second port and the fourth port, disconnect the third port from the sixth port Connect and establish a connection between the third port and the fifth port. The method of claim 11, wherein the port switch includes a first port, a second port, a third port, a fourth port, a fifth port, a sixth port and a seventh port, and the coupling The optical splitter includes an eighth port, a ninth port, a tenth port and an eleventh port, wherein the fourth port is connected to the eighth port, and the fifth port is connected to the ninth port, The sixth port is connected to the tenth port, and the seventh port is connected to the eleventh port; When it is determined that the optical communication system is in the first preset state, the first signal light is received through the first port in the port switch and transmitted to the coupling optical splitter through the fourth port. Emitting the first signal light, receiving the second signal light through the fifth port and transmitting the second signal light to the second node device through the second port, receiving the second signal light through the sixth port The third signal light is emitted to the sub-node device through the third port; When it is determined that the optical communication system is in the second preset state, the first signal light is received through the second port in the port switch and transmitted to the coupling optical splitter through the sixth port. Emitting the first signal light, receiving the third signal light through the fourth port and transmitting the third signal light to the first node device through the first port, receiving the third signal light through the seventh port The second signal light is emitted to the sub-node device through the third port. The method of claim 11, wherein the port switch includes a first port, a second port, a third port, a fourth port, a fifth port, a sixth port, a seventh port and an eighth port. , the coupling optical splitter includes a ninth port, a tenth port, an eleventh port and a twelfth port, wherein the fifth port is connected to the ninth port, and the sixth port is connected to the Ten ports are connected, the seventh port is connected to the eleventh port, and the eighth port is connected to the twelfth port; When it is determined that the optical communication system is in the first preset state, the first signal light is received through the first port in the port switch and transmitted to the coupling optical splitter through the fifth port. Emitting the first signal light, receiving the second signal light through the sixth port and transmitting the second signal light to the second node device through the second port, receiving the second signal light through the seventh port The third signal light is emitted to the sub-node device through the third port; When it is determined that the optical communication system is in the second preset state, the first signal light is received through the second port in the port switch and transmitted to the coupling optical splitter through the seventh port. Emitting the first signal light, receiving the third signal light through the fifth port and transmitting the third signal light to the first node device through the first port, receiving the third signal light through the eighth port The second signal light is emitted to the sub-node device through the fourth port. A circuit break protection method, characterized in that the circuit break protection method is suitable for an optical communication system. The optical communication system includes a port switch, a coupling optical splitter, a first node device, a second node device and a sub-node device, and the The child node device includes a first light-receiving module and a second light-receiving module, and the method includes: Receive the first signal light from the first node device through the port switch and transmit the first signal light to the coupling optical splitter; Split the first signal light into a second signal light and a third signal light through the coupling splitter, and send the second signal light and the third signal light to the port switch; Send the second signal light to the second node device through the port switch, and send the third signal light to the first transceiver and light module in the child node device; Receive the fourth signal light from the second node device through the port switch, and transmit the fourth signal light to the coupling optical splitter; Split the fourth signal light into fifth signal light and sixth signal light through the coupling splitter, and send the fifth signal light and the sixth signal light to the port switch; The sixth signal light is sent to the first node device through the port switch, and the fifth signal light is sent to the second transceiver and light module in the child node device, wherein the second signal light The optical power ratio between the sixth signal light and the fifth signal light is a first ratio, the optical power ratio between the sixth signal light and the fifth signal light is a second ratio, and the first ratio and the second ratio are reciprocals of each other. The method of claim 16, wherein the port switch includes a first port, a second port, a third port, a fourth port, a fifth port, a sixth port, a seventh port and an eighth port. , the coupling optical splitter includes a ninth port, a tenth port, an eleventh port and a twelfth port; wherein the fifth port is connected to the ninth port, and the sixth port is connected to the Ten ports are connected, the seventh port is connected to the eleventh port, and the eighth port is connected to the twelfth port; the method includes: The first signal light is received through the first port in the port switch and transmitted to the coupling splitter through the fifth port. The first signal light is received through the sixth port. The second signal light is emitted to the second node device through the second port, and the third signal light is received through the seventh port and sent to the sub-unit through the third port. The first light-receiving module in the node device emits the third signal light; The fourth signal light is received through the second port in the port switch and transmitted to the coupling splitter through the seventh port. The fourth signal light is received through the fifth port. The sixth signal light is emitted to the first node device through the first port, and the fifth signal light is received through the eighth port and sent to the sub-unit through the fourth port. The second light-receiving module in the node device emits the fifth signal light. The method according to claim 17, characterized in that the method includes: The first signal light is received through the first port in the port switch and transmitted to the coupling splitter through the fifth port. The first signal light is received through the sixth port. The second signal light is emitted to the second node device through the second port, and the third signal light is received through the seventh port and sent to the sub-unit through the third port. The first light-receiving module in the node device emits the third signal light; The fourth signal light is received through the first port in the port switch and transmitted to the coupling optical splitter through the fifth port. The fourth signal light is received through the sixth port. The fifth signal light is emitted to the second node device through the second port, and the sixth signal light is received through the seventh port and sent to the sub-unit through the fourth port. The second light-receiving module in the node device emits the sixth signal light. The method according to claim 17 or 18, characterized in that the method includes: The first signal light is received through the second port in the port switch and transmitted to the coupling splitter through the sixth port. The first signal light is received through the eighth port. The second signal light is emitted to the first node device through the first port, and the third signal light is received through the fifth port and sent to the sub-unit through the third port. The first light-receiving module in the node device emits the third signal light; The fourth signal light is received through the second port in the port switch and transmitted to the coupling splitter through the seventh port. The fourth signal light is received through the fifth port. The fifth signal light is transmitted to the first node device through the first port, and the sixth signal light is received through the eighth port and sent to the sub-unit through the fourth port. The second light-receiving module in the node device emits the sixth signal light.