WO2025246528A1 - Optical cross-connect device and optical switching network - Google Patents

Abstract

The embodiments of the present application relate to the technical field of optical communications. Provided are an optical cross-connect device and an optical switching network. The optical cross-connect device can determine the position of a reflection point in an output optical fiber link, with the detection efficiency being high and the consumed time being short. One service optical output port in the optical cross-connect device is connected to one output optical fiber link, and a first detection optical assembly is connected to a first detection optical port; and a scanning control unit controls the first detection optical port to couple to the service optical output port, and controls the first detection optical assembly to output a first transmitting optical signal. The first transmitting optical signal is transmitted to the output optical fiber link by means of the first detection optical port and the service optical output port, which are coupled to each other; the first transmitting optical signal becomes a first detection optical signal after being transmitted by means of the output optical fiber link; the first detection optical signal comprises a first reflected signal, and is used for determining the peak and position of the first reflected signal; and the first reflected signal is output on the basis of at least one reflection point in the output optical fiber link.

Description

Optical cross-connect equipment and optical switching network

This application claims priority to Chinese patent application filed on May 31, 2024, with application number 202410708376.1 and title "Optical cross-connect device and optical switching network", the entire contents of which are incorporated herein by reference.

Technical Field

This application relates to the field of optical communication technology, and in particular to an optical cross-connect device and an optical switching network.

Background Technology

An optical switching network includes optical cross-connect (OXC) devices, which have multiple service optical input ports and multiple service optical output ports. The optical switching network also includes multiple service optical transmitting components and multiple service optical receiving components. Each service optical transmitting component is connected to a service optical input port via an input fiber optic link, and each service optical receiving component is connected to a service optical output port via an output fiber optic link.

The input or output fiber optic link comprises multiple link devices connected by optical fibers. These link devices include fiber optic distribution frames, and are connected to the optical fibers via fiber optic connectors. Link devices are typically located outdoors, and their performance is easily affected by the surrounding environment. For example, in harsh environments, frequent plugging and unplugging of fiber optic connectors can cause them to become dirty or loose, leading to reflection points in the input or output fiber optic link. This, in turn, increases the bit error rate of the service optical signal received by the service optical receiving component.

Currently, when the bit error rate of the service optical signal received by the service optical receiving component increases, the usual method for detecting reflection points in the input or output fiber optic links is for maintenance personnel to go to the location of the service optical receiving or transmitting component and use testing equipment to inspect the input or output fiber optic links to determine the location of reflection points. However, this detection method is inefficient and time-consuming.

Summary of the Invention

Embodiments of this application provide an optical cross-connect device and an optical switching network that can determine the location of reflection points in input or output optical fiber links with high detection efficiency and short detection time.

In a first aspect, an optical cross-connect device is provided. The optical cross-connect device includes multiple service optical output ports, one of which is connected to an output optical fiber link. The optical cross-connect device further includes a scanning control unit, a first detection optical port, and a first detection optical component. The first detection optical component is connected to the first detection optical port and the scanning control unit. The scanning control unit is used to control the coupling between the first detection optical port and the service optical output port, and to output a first control signal to the first detection optical component. The first detection optical component is used to output a first transmit optical signal according to the first control signal. The first transmit optical signal is transmitted to the output optical fiber link through the coupled first detection optical port and the service optical output port. The first transmit optical signal becomes a first detection optical signal after transmission through the output optical fiber link. The first detection optical signal includes a first reflection signal. The first detection optical signal is used to determine the peak value and position of the first reflection signal. The first reflection signal is output based on at least one reflection point in the output optical fiber link. In this optical cross-connect device, a first detection optical signal is used to determine the peak value and position of a first reflected signal. The first detection optical signal can be in the opposite direction to the transmission direction of the first transmitted optical signal. The first reflected signal can be formed by reflecting the first transmitted optical signal from a reflection point in the output optical fiber link. Alternatively, the first detection optical signal can be in the same direction as the transmission direction of the first transmitted optical signal. The first reflected signal is output by a reflection cavity formed by the first detection optical component and at least two reflection points in the output optical fiber link. The first reflected signal can include multiple peak values and positions. Based on the peak values and positions of the reflected signal, the position of the reflection point in the output optical fiber link can be determined. This detection method is highly efficient and time-saving.

Optionally, the first detection optical component is further configured to receive a first detection optical signal and determine the peak value and position of a first reflected signal based on the first detection optical signal. The first reflected signal is formed by the reflection of the first transmitted optical signal by a reflection point in the output optical fiber link. In this optional configuration, the first detection optical component receives the first detection optical signal. The first transmitted optical signal, which is scattered and then transmitted in the reverse direction during transmission in the output optical fiber link, is the first detection optical signal. The transmission directions of the first detection optical signal and the first transmitted optical signal are opposite. Specifically, the first reflected signal is formed by the reflection of the first transmitted optical signal by a reflection point in the output optical fiber link. The first reflected signal may include multiple peak values and positions, and one peak value and position of the first reflected signal represents the reflection intensity and position of a reflection point in the output optical fiber link. Furthermore, based on the reflection intensity, it can be determined which reflection points on the output optical fiber link will have a significant impact on the bit error rate of the optical signal received by the service optical receiving component.

Optionally, the optical cross-connect device further includes multiple service optical input ports and a second detection optical port, with one service optical input port connected to an input optical fiber link, and a first detection optical component connected to the second detection optical port; the scanning control unit is further configured to control the coupling between the second detection optical port and the service optical input port, and output a second control signal to the first detection optical component; the first detection optical component is further configured to output a second transmit optical signal according to the second control signal, the second transmit optical signal being transmitted to the input optical fiber link through the coupled second detection optical port and the service optical input port, and the second transmit optical signal becoming a second detection optical signal after transmission through the input optical fiber link, the second detection optical signal including a second reflection signal, the second reflection signal being formed by the reflection of the second transmit optical signal by a reflection point in the input optical fiber link; the first detection optical component is further configured to receive the second detection optical signal and determine the peak value and position of the second reflection signal based on the second detection optical signal. In this optional method, the first detection optical component is used to output the second transmitted optical signal and receive the second detection optical signal. The peak value and position of the second reflected signal are determined based on the second detection optical signal. The second transmitted optical signal is the second detection optical signal that is scattered and transmitted in the reverse direction during transmission in the input optical fiber link. The transmission direction of the second detection optical signal is opposite to that of the second transmitted optical signal. The second reflected signal is formed by the reflection of the second transmitted optical signal by a reflection point in the input optical fiber link. The second reflected signal may include multiple peak values and positions, and one peak value and position of the second reflected signal represents the reflection intensity and position of a reflection point in the input optical fiber link. Based on the reflection intensity, it can be determined which reflection points on the input optical fiber link will have a significant impact on the bit error rate of the optical signal received by the service optical receiving component.

Optionally, the optical cross-connect device further includes an optical switch; a first detection optical component is connected to a first end of the optical switch, a first detection optical port is connected to a second end of the optical switch, a second detection optical port is connected to a third end of the optical switch, and a control end of the optical switch is connected to a scan control unit; the scan control unit is further configured to output a first switch control signal to the optical switch; the optical switch is configured to connect the first end of the optical switch to the second end of the optical switch according to the first control signal; the scan control unit is further configured to output a second switch control signal to the optical switch; the optical switch is configured to connect the first end of the optical switch to the third end of the optical switch according to the second switch control signal. In this optional configuration, through the cooperation of the optical switch and the first detection optical component, it is possible to use one first detection optical component to output a first transmit optical signal to the output optical fiber link and to output a second transmit optical signal to the input optical fiber link.

Optionally, the first detection optical component includes a first sub-detection optical component and a second sub-detection optical component. The first sub-detection optical component is connected to a first detection optical port, and the second sub-detection optical component is connected to a second detection optical port. The first sub-detection optical component is used to output a first transmit optical signal according to a first control signal; the second sub-detection optical component is used to output a second transmit optical signal according to a second control signal. In this optional configuration, the first sub-detection optical component outputs the first transmit optical signal to the output fiber optic link, and the second sub-detection optical component outputs the second transmit optical signal to the input fiber optic link.

Optionally, one of the multiple service optical input ports is used as the first detection optical port, and one of the multiple service optical output ports is used as the second detection optical port. In this optional configuration, the first detection optical port occupies one service optical input port, and the second detection optical port occupies one service optical input port.

Optionally, the optical cross-connect device further includes a first monitoring optical transmission port and a second monitoring optical transmission port. The first monitoring optical transmission port is located on the same side as multiple service optical input ports, and the second monitoring optical transmission port is located on the same side as multiple service optical output ports. The first monitoring optical transmission port serves as the first detection optical port, and the second monitoring optical transmission port serves as the second detection optical port. In this optional configuration, the first detection optical port occupies the first monitoring optical transmission port but does not occupy the service optical input ports, and the second detection optical port occupies the second monitoring optical transmission port but does not occupy the service optical input ports. This reduces the impact of setting up the first detection optical component on the number of service optical input ports and service optical output ports.

Optionally, the optical cross-connect device also includes an optical cross-connect device and a first fiber array unit and a second fiber array unit disposed on both sides of the optical cross-connect device; the first fiber array unit includes multiple service optical input ports and a first detection optical port, and the second fiber array unit includes multiple service optical output ports and a second detection optical port.

Optionally, the first detection optical component is also used to determine the location and insertion loss value of the insertion loss point in the output optical fiber link based on the first detection optical signal.

Optionally, the first detection optical component includes: a signal generator, an electro-optic modulator, a photoelectric converter, a signal processor, and an optical transmission device. A first end of the optical transmission device is connected to the electro-optic modulator, a second end of the optical transmission device is connected to the first detection optical port, and a third end of the optical transmission device is connected to the photoelectric converter. The signal generator is used to output a first transmitted electrical signal. The electro-optic modulator is used to output a first transmitted optical signal based on the first transmitted electrical signal. The optical transmission device is used to receive the first transmitted optical signal through its first end and transmit the first transmitted optical signal to the first detection optical port through its second end. The optical transmission device is also used to receive a first detection optical signal through the first detection optical port and transmit the first detection optical signal to the photoelectric converter through its third end. The photoelectric converter is used to output a first detection electrical signal based on the first detection optical signal. The signal processor is used to determine the peak value and position of the first reflected signal based on the first detection electrical signal.

Optionally, the first transmitted electrical signal includes a first detection sequence, wherein the first detection sequence includes any of the following: a linear frequency modulated signal, a constant envelope zero autocorrelation signal, and a step frequency signal.

Optionally, optical transmission devices include duplexers or loopers.

Optionally, the first detection optical signal is transmitted to the service optical receiving component, and the first reflected signal is output by a reflective cavity formed by at least two reflection points in the first detection optical component and the output optical fiber link. In this optional method, the service optical receiving component receives the first detection optical signal. After the first detection optical component outputs a first transmitted optical signal, the first transmitted optical signal is transmitted to the service optical receiving component through the output optical fiber link. All optical signals received by the service optical receiving component are referred to as the first detection optical signal. The first detection optical signal and the first transmitted optical signal have the same transmission direction. The first reflected signal is output by a reflective cavity formed by at least two reflection points in the first detection optical component and the output optical fiber link. The first reflected signal may include multiple peaks and positions, and one peak and position of the first reflected signal represents the reflection intensity and position of the reflective cavity formed by two reflection points in the first detection optical component and the output optical fiber link. Based on the reflection intensity, it can be determined which reflection points on the output optical fiber link will have a significant impact on the bit error rate of the optical signal received by the service optical receiving component.

Optionally, the optical cross-connect device further includes multiple service optical input ports, a second detection optical port, and a second detection optical component. One service optical input port is connected to an input optical fiber link, and the second detection optical component is connected to the second detection optical port. The second detection optical component is used to receive the second detection optical signal transmitted to the second detection optical component through the input optical fiber link via the coupled second detection optical port and the service optical input port. Based on the second detection optical signal, the peak value and position of the second reflection signal are determined. The second detection optical signal includes the second reflection signal, which is output by a reflection cavity formed by at least two reflection points in the second detection optical component and the input optical fiber link. In this optional method, the second detection optical signal is formed by the second transmission optical signal output by the service optical transmission component being transmitted to the second detection optical component through the input optical fiber link. The second detection optical component receives the second detection optical signal, and the transmission direction of the second detection optical signal is consistent with that of the second transmission optical signal. The second reflection signal is output by a reflection cavity formed by at least two reflection points in the second detection optical component and the input optical fiber link. The second reflection signal may include multiple peaks and positions, and one peak and position of the second reflection signal represents the reflection intensity and position of the reflection cavity formed by two reflection points in the second detection optical component and the input optical fiber link. Based on the reflection intensity, it can be determined which reflection points on the input optical fiber link will have a significant impact on the bit error rate of the optical signal received by the service optical receiving component.

Optionally, one of the multiple service optical input ports serves as the first detection optical port, and one of the multiple service optical output ports serves as the second detection optical port; the scanning control unit is also used to control the coupling between the second detection optical port and the service optical input port. In this optional configuration, the first detection optical port occupies one service optical input port, and the second detection optical port occupies one service optical input port.

Optionally, the optical cross-connect device also includes an optical cross-connect device and a first fiber array unit and a second fiber array unit disposed on both sides of the optical cross-connect device; the first fiber array unit includes multiple service optical input ports and a first detection optical port, and the second fiber array unit includes multiple service optical output ports and a second detection optical port.

Optionally, the optical cross-connect device further includes a monitoring optical transmit port and a monitoring optical receive port, with the monitoring optical transmit port serving as the first detection optical port and the monitoring optical receive port serving as the second detection optical port. In this optional configuration, the first detection optical port occupies the monitoring optical transmit port but not the service optical input port, and the second detection optical port occupies the monitoring optical receive port but not the service optical input port. This reduces the impact of configuring the first and second detection optical components on the number of service optical input ports and service optical output ports.

Optionally, the optical cross-connect device further includes an optical cross-connect device and a first fiber array unit and a second fiber array unit disposed on both sides of the optical cross-connect device; the first fiber array unit includes multiple service optical input ports, a first detection optical port and a second detection optical port, and the second fiber array unit includes multiple service optical output ports; each of the multiple service optical input ports is coupled to the second detection optical port through the optical cross-connect device; or, the first fiber array unit includes multiple service optical input ports and a first detection optical port, and the second fiber array unit includes multiple service optical output ports and a second detection optical port, each of the multiple service optical output ports is coupled to the second detection optical port through the optical cross-connect device.

Optionally, the first detection optical component includes: a signal generator and an electro-optic modulator; the signal generator is used to output a first transmitted electrical signal; the electro-optic modulator is used to output a first transmitted optical signal according to the first transmitted electrical signal.

Optionally, the first transmitted electrical signal includes a second detection sequence, or the first transmitted electrical signal includes a second detection sequence and a first service electrical signal, wherein the byte containing the second detection sequence is different from the byte containing the first service electrical signal, or the second detection sequence is a modulation signal of the first service electrical signal; wherein the second detection sequence includes any of the following: a linear frequency modulation signal, a constant envelope zero autocorrelation signal, or a step frequency signal.

Optionally, the first detection optical component further includes a first reflection component and an isolator disposed between the electro-optic modulator and the first reflection component. The first reflection component serves as one of at least two reflection points. In this optional configuration, a peak value and position of the first reflection signal represent the reflection intensity and position of the reflection cavity formed by the first detection optical component and the two reflection points in the output optical fiber link. When the first detection optical component also includes a first reflection component, one of the two reflection points is the first reflection component, and the other reflection point is the reflection point in the output optical fiber link, thereby achieving precise positioning of the reflection point in the output optical fiber link.

Optionally, the first reflective component includes a reflective film, or a polarizing beam splitter and a reflective film, or a coupler and a looper.

Optionally, the second detection optical component includes: a photoelectric converter and a signal processor; the photoelectric converter is used to receive the second detection optical signal and output a second detection electrical signal based on the second detection optical signal; the signal processor is used to determine the peak value and position of the second reflected signal based on the second detection electrical signal.

Optionally, the second transmitted electrical signal includes a second detection sequence, or the second transmitted electrical signal includes a second detection sequence and a second service electrical signal; wherein, the second detection sequence includes any of the following: a linear frequency modulated signal, a constant envelope zero autocorrelation signal, and a step frequency signal; the second transmitted optical signal corresponding to the second transmitted electrical signal is transmitted to the second detection optical component through the input optical fiber link to become the second detection optical signal.

Optionally, the second detection optical component further includes a second reflection component, which serves as one of at least two reflection points. In this optional configuration, a peak value and position of the second reflection signal represent the reflection intensity and position of the reflection cavity formed by the second detection optical component and the two reflection points in the input fiber optic link. When the second detection optical component also includes a second reflection component, one of the two reflection points is the second reflection component, and the other reflection point is the reflection point in the input fiber optic link, thereby achieving precise positioning of the reflection point in the input fiber optic link.

Optionally, the second reflective component includes a reflective film, or a polarizing beam splitter and a reflective film, or a coupler and a circulator.

In a second aspect, an optical switching network is provided, comprising multiple service optical receiving components and an optical cross-connect device as described in any of the first aspects above; one service optical receiving component is connected to a service optical output port via an output optical fiber link.

Optionally, the optical switching network also includes a controller, which is connected to the service optical receiving component and the optical cross-connect device respectively; the controller is used to output a first scan control signal to the optical cross-connect device, the first scan control signal is used to control the scan control unit to couple each of the multiple service optical output ports to the first detection optical port in a time-division manner, and the first scan control signal is also used to control the scan control unit to output a first control signal to the first detection optical component in a time-division manner.

Thirdly, an optical cross-connect device is provided, comprising multiple service optical input ports, one of which is connected to an input optical fiber link; the optical cross-connect device further comprises: a second detection optical port and a second detection optical component, the second detection optical component being connected to the second detection optical port; the second detection optical component is used to receive a second detection optical signal transmitted to the second detection optical component through the coupled second detection optical port and the service optical input port from the input optical fiber link, and to determine the peak value and position of a second reflection signal based on the second detection optical signal; wherein the second detection optical signal includes a second reflection signal, the second reflection signal being output based on at least one reflection point in the input optical fiber link.

Optionally, the optical cross-connect device further includes a scanning control unit connected to the second detection optical component. The scanning control unit is used to control the coupling of the second detection optical port with the service optical input port and to output a second control signal to the second detection optical component. The second detection optical component is also used to output a second transmit optical signal according to the second control signal. The second transmit optical signal is transmitted to the input optical fiber link through the coupled second detection optical port and the service input port. After being transmitted through the input optical fiber link, the second transmit optical signal becomes the second detection optical signal. The second reflection signal is formed by the reflection of the second transmit optical signal by a reflection point in the input optical fiber link.

Optionally, the second detection optical signal is formed by transmitting the second transmission optical signal output by the service optical transmission component to the second detection optical component through the input optical fiber link; the second reflection signal is output by the reflection cavity formed by at least two reflection points in the second detection optical component and the input optical fiber link.

The technical effects of any of the possible implementations of the second to third aspects can be found in the technical effects of the different implementations of the first aspect mentioned above, and will not be repeated here.

Attached Figure Description

Figure 1 is a schematic diagram of the structure of an optical switching network provided in an embodiment of this application;

Figure 2 is a schematic diagram of the structure of an optical switching network provided in another embodiment of this application;

Figure 3 is a waveform diagram of the optical x-domain reflectometer provided in an embodiment of this application;

Figure 4 is a schematic diagram of the structure of the optical cross-connect device provided in an embodiment of this application;

Figure 5 is a structural schematic diagram of an optical cross-connect device provided in another embodiment of this application;

Figure 6 is a schematic diagram of the structure of an optical cross-connect device provided in another embodiment of this application;

Figure 7 is a schematic diagram of the structure of an optical cross-connect device provided in another embodiment of this application;

Figure 8 is a schematic diagram of the detection optical component in the optical cross-connect device provided in an embodiment of this application;

Figure 9 is a schematic diagram of the structure of an optical switching network provided in another embodiment of this application;

Figure 10 is a waveform diagram of optical x-domain analysis provided in an embodiment of this application;

Figure 11 is a schematic diagram of the structure of an optical cross-connect device provided in another embodiment of this application;

Figure 12 is a schematic diagram of the structure of an optical cross-connect device provided in another embodiment of this application;

Figure 13 is a structural schematic diagram of an optical cross-connect device provided in another embodiment of this application;

Figure 14 is a schematic diagram of the detection optical component in an optical cross-connect device provided in another embodiment of this application;

Figure 15 is a schematic diagram of the structure of the detection optical component in an optical cross-connect device provided in another embodiment of this application;

Figure 16 is a schematic diagram of the structure of the detection optical component in an optical cross-connect device provided in another embodiment of this application;

Figure 17 is a schematic diagram of the detection optical component in an optical cross-connect device provided in another embodiment of this application;

Figure 18 is a schematic diagram of the structure of the detection optical component in an optical cross-connect device provided in another embodiment of this application;

Figure 19 is a schematic diagram of the detection optical component in an optical cross-connect device provided in another embodiment of this application;

Figure 20 is a schematic diagram of the detection optical component in an optical cross-connect device provided in another embodiment of this application;

Figure 21 is a schematic diagram of the structure of the detection optical component in an optical cross-connect device provided in another embodiment of this application;

Figure 22 is a schematic diagram of the structure of the detection optical component in an optical cross-connect device provided in another embodiment of this application.

Detailed Implementation

The technical solutions in the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

Unless otherwise defined, all technical terms used herein have the same meaning as those known to one of ordinary skill in the art. In the embodiments of this application, "at least one" means one or more, and "more than one" means two or more. "And/or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and/or B can mean: A exists alone, A and B exist simultaneously, or B exists alone, where A and B can be singular or plural. The character "/" generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can mean: a, b, c, a and b, a and c, b and c, or a, b, and c, where a, b, and c can be single or multiple. In addition, in the embodiments of this application, the words "first," "second," etc., do not limit the quantity or order.

Furthermore, in the embodiments of this application, directional terms such as "upper" and "lower" are defined relative to the orientation in which the components are schematically placed in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the orientation in which the components are placed in the accompanying drawings.

In the embodiments of this application, the words "exemplary" or "for example" are used to indicate that they are examples, illustrations, or descriptions. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design options. Specifically, the use of the words "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

The embodiments of this application will now be described in detail with reference to the accompanying drawings.

Referring to Figure 1, an embodiment of this application provides a structural schematic diagram of an optical switching network 100. The optical switching network 100 includes an optical cross-connect (OXC) device 10, multiple service optical input ports (service optical input port _i1 , service optical input port _i2 ...service optical input port in as shown in Figure 1) and multiple service optical output _ports (service optical input port _o1 , service optical input port _o2 ...service optical input port on as shown in Figure 1). The optical switching network 100 also includes multiple service optical transmitting components 20 (service optical transmitting component _20-1 , service optical transmitting component 20-2...service optical transmitting component 20-n as shown in Figure 1) and multiple service optical receiving components 30 (service optical receiving component 30-1, service optical receiving component 30-2...service optical receiving component 30-n as shown in Figure 1). One service optical transmitting component 20 is connected to a service optical input port through an input optical fiber link, and one service optical receiving component 30 is connected to a service optical output port through an output optical fiber link.

For example, referring to FIG1, the optical cross-connect device 10 specifically includes an optical cross-connect device 11, and fiber array units (FAUs) 12 and 13 respectively disposed at both ends of the optical cross-connect device 11. The fiber array unit 12 includes multiple service optical input ports, and the fiber array unit 13 includes multiple service optical output ports.

Referring to Figure 1, the input fiber optic link includes multiple link devices connected by optical fibers. These link devices include fiber optic distribution frames 101 and 102, etc., and are connected to the optical fibers via fiber optic connectors. The link devices are typically located outdoors, and their performance is easily affected by the surrounding environment. For example, in poor environmental conditions and when fiber optic connectors are plugged and unplugged, they often become dirty or loose, leading to reflection points in the input fiber optic link. This results in an increased bit error rate for the service optical signal received by the service optical receiving component 30 via the input fiber optic link.

The output fiber optic link includes multiple link devices connected by optical fibers, such as fiber optic distribution frames 103 and 104. These link devices are connected to the optical fibers via fiber optic connectors. These link devices are typically located outdoors, and their performance is easily affected by the surrounding environment. For example, in harsh environments, frequent plugging and unplugging of fiber optic connectors can cause them to become dirty or loose, leading to reflection points in the output fiber optic link. This results in an increased bit error rate for the service optical signal received by the service optical receiving component 30 via the output fiber optic link.

Currently, when the bit error rate of the service optical signal received by the service optical receiving component 30 increases, the usual method for detecting whether there are reflection points in the input or output optical fiber links is for maintenance personnel to go to the location of the service optical transmitting component 20 or the service optical receiving component 30 and use detection equipment to inspect the input or output optical fiber links to determine the location of the reflection points. However, this detection method is inefficient and time-consuming.

Therefore, embodiments of this application provide an optical cross-connect device that can be installed in the optical switching network shown in FIG1. The optical cross-connect device can detect reflection points in the input or output optical fiber links with high detection efficiency and short detection time.

Referring to Figure 2, an embodiment of this application provides a schematic diagram of the structure of an optical switching network 200. The optical switching network 200 includes multiple service optical receiving components 30 (service optical receiving component 30-1, service optical receiving component 30-2...service optical receiving component 30-n as shown in Figure 2) and an optical cross-connect device 40. The optical cross-connect device 40 includes multiple service optical output ports (service optical input port _o1 , service optical input port _o2 ...service optical input port o _n as shown in Figure 2), and each service optical output port is connected to an output optical fiber link 60.

In Figure 2, a service optical receiver 30 is connected to a service optical output port via an output optical fiber link 60. Specifically, service optical receiver 30-1 is connected to service optical output port _o1 via output optical fiber link 60-1, service optical receiver 30-2 is connected to service optical output port _o2 via output optical fiber link 60-2, and service optical receiver 30-n is connected to service optical output port o _n via output optical fiber link 60-n.

For example, the output fiber optic link 60-1 includes multiple link devices for fiber optic connections, including fiber optic distribution frames 103 and 104 as shown in Figure 1. The left side of fiber optic distribution frame 103 is connected to the fiber optic cable via fiber optic connector C5, and the right side of fiber optic distribution frame 103 is connected to the fiber optic cable via fiber optic connector C6. The left side of fiber optic distribution frame 104 is connected to the fiber optic cable via fiber optic connector C7, and the right side of fiber optic distribution frame 104 is connected to the fiber optic cable via fiber optic connector C8. Therefore, the output fiber optic link 60-1 includes fiber optic connectors C5, C6, C7, and C8.

Referring to Figure 2, the optical cross-connect device 40 further includes: a scanning control unit 46, a detection optical port _d1 (also referred to as a first detection optical port), and a detection optical component 41 (referred to as a first detection optical component, sometimes also referred to as a second detection optical component). The detection optical component 41 is connected to the detection optical port _d1 and to the scanning control unit 46. For example, the detection optical component 41 is integrated into the optical cross-connect device 40, and the detection optical component 41 and the optical cross-connect device 40 are a single unit.

The scanning control unit 46 is used to control the coupling between the detection optical port _d1 and the service optical output port, and to output a first control signal to the detection optical component 41.

The detection optical component 41 is used to output a transmit optical signal Oa (also referred to as the first transmit optical signal) according to the first control signal. The transmit optical signal Oa is transmitted to the output optical fiber link 60 through the coupled detection optical port _d1 and the service optical output port. The transmit optical signal Oa becomes a detection optical signal Oa1 (also referred to as the first detection optical signal) after being transmitted through the output optical fiber link 60. The detection optical signal Oa1 includes a first reflection signal. The detection optical signal Oa1 is used to determine the peak value and position of the first reflection signal. The first reflection signal is output based on at least one reflection point in the output optical fiber link 60.

Specifically, in the optical cross-connect device 40 shown in Figure 2, the detection optical component 41 outputs a transmitted optical signal Oa. The transmitted optical signal Oa is scattered during transmission in the output optical fiber link 60 and then transmitted in the reverse direction to form a detection optical signal Oa1. The detection optical signal Oa1 includes a first reflected optical signal, which is formed by the reflection of the transmitted optical signal Oa by the reflection point in the output optical fiber link 60. The transmission direction of the detection optical signal Oa1 is opposite to that of the transmitted optical signal Oa, and the transmission direction of the first reflected signal is also opposite to that of the transmitted optical signal Oa. The detection optical component 41 is also used to receive the detection optical signal Oa1 and determine the peak value and position of the first reflected signal based on the detection optical signal Oa1.

For example, the detected optical signal Oa1 is used to determine the optical x-domain reflectionometry (OxDR) waveform, and then to determine the peak value and position of the first reflected signal. The horizontal axis of the OxDR waveform represents distance, and the vertical axis represents intensity. When the OxDR waveform includes m peaks, the first reflected signal includes m peak values and positions, where m is a positive integer greater than or equal to 1. Specifically, a peak in the OxDR waveform is formed by the reflection of the transmitted optical signal Oa by a reflection point in the output fiber optic link 60. The intensity value and distance corresponding to the top of a peak represent a peak value and position of the first reflected signal, and the peak value and position of the first reflected signal represent the reflection intensity and position of a reflection point in the output fiber optic link 60. The greater the reflection intensity of a reflection point, the greater its impact on the bit error rate of the service optical signal received by the service optical receiving component 30.

For example, the scanning control unit 46 couples the detection optical port _d1 with the service optical output port _o1 . The detection optical component 41 outputs a transmit optical signal Oa according to the first control signal. The transmit optical signal Oa is transmitted to the output optical fiber link 60-1 through the coupled detection optical port _d1 and the service optical output port _o1. The transmit optical signal Oa is scattered and then transmitted in the reverse direction in the output optical fiber link 60-1, which is the detection optical signal Oa1. The detection optical component 41 is also used to receive the detection optical signal Oa1 and determine the peak value and position of the first reflected signal formed by the reflection of the transmit optical signal Oa by at least one reflection point in the output optical fiber link 60-1 based on the detection optical signal Oa1.

The detection optical component 41 determines an OxDR waveform based on the detected optical signal Oa1, as shown in Figure 3. The OxDR waveform in Figure 3 includes two peaks, representing the two peak values and positions of the first reflected signal formed by the reflection of the transmitted optical signal Oa from two reflection points in the output fiber optic link 60-1. For example, based on the peaks in Figure 3, one peak and position of the first reflected signal is (A1, B1), and the other peak and position is (A2, B2). Furthermore, knowing that the distance represented by the horizontal axis of the OxDR waveform is the product of time and the speed of light divided by 2, it can be determined that the distance from one reflection point in the output fiber optic link 60-1 to the detection optical component 41 is B1, with a reflection intensity of A1, and the distance from the other reflection point in the output fiber optic link 60-1 to the detection optical component 41 is B2, with a reflection intensity of A2. The reflection intensity of the reflection point specifically represents the return loss of the reflection point.

For example, if the distance between a reflection point in the output fiber optic link 60-1 and the detection optical component 41 is known to be B1, and the distance between another reflection point in the output fiber optic link 60-1 and the detection optical component 41 is B2, it can be known from the fact that the distance between the fiber optic connector C5 and the detection optical component 41 in the output fiber optic link 60-1 is B1, and the distance between the fiber optic connector C7 and the detection optical component 41 in the output fiber optic link 60-1 is B2, then the reflection points in the output fiber optic link 60-1 are specifically the reflection points formed by dirt or looseness of the fiber optic connectors C5 and C7.

In some embodiments, the detection optical component 41 is further configured to determine the location and insertion loss value of the insertion loss point in the output optical fiber link 60-1 based on the detection optical signal Oa1.

For example, when the detection optical component 41 determines an OxDR waveform as shown in Figure 3 based on the detection optical signal Oa1, the steep drop in the OxDR waveform in Figure 3 is caused by the insertion loss point in the output optical fiber link 60-1. Furthermore, the OxDR waveform in Figure 3 includes two steep drops; one of these drops is caused by an insertion loss point in the output optical fiber link 60-1. Based on the distance and magnitude of the steep drop in the OxDR waveform, the location and magnitude of the insertion loss point in the output optical fiber link 60-1 can be determined.

Similarly, when the scanning control unit 46 controls the coupling of the detection optical port _d1 with the service optical output port _o2 , the detection optical component 41 outputs a transmit optical signal Oa according to the first control signal. The transmit optical signal Oa is transmitted to the output optical fiber link 60-2 through the coupled detection optical port _d1 and the service optical output port _o2. The transmit optical signal Oa will be scattered and then transmitted in the reverse direction in the output optical fiber link 60-2, which is the detection optical signal Oa1. The detection optical component 41 is also used to receive the detection optical signal Oa1 and determine the peak value and position of the first reflected signal formed by the reflection of the transmit optical signal Oa by at least one reflection point in the output optical fiber link 60-2 based on the detection optical signal Oa1.

When the scanning control unit 46 controls the coupling of the detection optical port _d1 with the service optical output port _on , the detection optical component 41 outputs a transmit optical signal Oa according to the first control signal. The transmit optical signal Oa is transmitted to the output optical fiber link 60-n through the coupled detection optical port _d1 and the service optical output port on _. The transmit optical signal Oa will be scattered and then transmitted in the reverse direction in the output optical fiber link 60-n, which is the detection optical signal Oa1. The detection optical component 41 is also used to receive the detection optical signal Oa1 and determine the peak value and position of the first reflected signal formed by the reflection of the transmit optical signal Oa by at least one reflection point in the output optical fiber link 60-n based on the detection optical signal Oa1.

In the optical cross-connect device 40, the scanning control unit 46 controls the coupling of the detection optical port _d1 with the service optical output port and outputs a first control signal to the detection optical component 41. The detection optical component 41 outputs a transmit optical signal Oa according to the first control signal. The transmit optical signal Oa is transmitted to the output optical fiber link 60 through the coupled detection optical port _d1 and the service optical output port. After transmission through the output optical fiber link 60, the transmit optical signal Oa becomes a detection optical signal Oa1, which is used to determine the peak value and position of the first reflected signal. The first reflected signal is output based on at least one reflection point in the output optical fiber link 60. In the example shown in Figure 2, specifically, the detection optical component 41 outputs a transmitted optical signal Oa. The transmitted optical signal Oa, during its transmission in the output optical fiber link 60, undergoes scattering and is then transmitted in the reverse direction, forming a detection optical signal Oa1. The detection optical component 41 receives the detection optical signal Oa1 and, based on Oa1, determines the peak value and position of a first reflected signal formed by the reflection of the transmitted optical signal Oa from at least one reflection point in the output optical fiber link 60. The first reflected signal may include multiple peak values and positions, and a single peak value and position of the first reflected signal represents the reflection intensity and position of a reflection point in the output optical fiber link 60. Furthermore, based on the reflection intensity, it can be determined which reflection points on the output optical fiber link 60 will have a significant impact on the bit error rate of the optical signal received by the service optical receiving component 30. Using the detection optical signal Oa1 to determine the position of reflection points in the output optical fiber link 60 is a highly efficient and time-saving detection method.

For example, as shown in FIG2, the optical switching network 200 further includes multiple service optical transmission components 20 (service optical transmission component 20-1, service optical transmission component 20-2...service optical transmission component 20-n as shown in FIG2), and the optical cross-connect device 40 further includes multiple service optical input ports (service optical input port _i1 , service optical input port _i2 ...service optical input port in _FIG2 ), and one service optical input port is connected to an input optical fiber link 50.

In Figure 2, a service optical transmission component 20 is connected to a service optical input port via an input fiber optic link 50. Specifically, service optical transmission component 20-1 is connected to service optical input port _i1 via input fiber optic link 50-1, service optical transmission component 20-2 is connected to service optical input port _i2 via input fiber optic link 50-2, and service optical transmission component 20-n is connected to service optical input port in via input fiber optic link 50- _n .

For example, the input fiber optic link 50-1 includes multiple link devices for fiber optic connections. These link devices include fiber optic distribution frames 101 and 102, as shown in Figure 1. The left side of fiber optic distribution frame 101 is connected to the fiber optic cable via fiber optic connector C1, the right side of fiber optic distribution frame 101 is connected to the fiber optic cable via fiber optic connector C2, the left side of fiber optic distribution frame 102 is connected to the fiber optic cable via fiber optic connector C3, and the right side of fiber optic distribution frame 102 is connected to the fiber optic cable via fiber optic connector C4. Therefore, the input fiber optic link 50-1 includes fiber optic connectors C1, C2, C3, and C4.

Referring to FIG2, the optical cross-connect device 40 further includes: a detection optical port _d2 (also referred to as the second detection optical port) and a detection optical component 41 (also referred to as the first detection optical component and the second detection optical component), the detection optical component 41 being connected to the detection optical port _d2 .

The detection optical component 41 is used to receive the detection optical signal Ob1 (also referred to as the second detection optical signal) transmitted from the input optical fiber link 50 to the detection optical component 41 through the coupled detection optical port _d2 and the service optical input port, and to determine the peak value and position of the second reflection signal based on the detection optical signal Ob1; wherein, the detection optical signal Ob1 includes the second reflection signal, and the second reflection signal is output based on at least one reflection point in the input optical fiber link 50.

Specifically, in the optical cross-connect device 40 shown in Figure 2, the optical cross-connect device 40 also includes a scanning control unit 46, which is connected to the detection optical component 41. The scanning control unit 46 is used to control the coupling of the detection optical port _d2 with the service optical input port and to output a second control signal to the detection optical component 41. The detection optical component 41 is also used to output a transmit optical signal Ob (also referred to as the second transmit optical signal) according to the second control signal. The transmit optical signal Ob is transmitted to the input optical fiber link 50 through the coupled detection optical port _d2 and the service input port. After the transmit optical signal Ob is transmitted through the input optical fiber link 50, it becomes the detection optical signal Ob1. Specifically, the transmit optical signal Ob will be scattered and then transmitted in the reverse direction during transmission in the input optical fiber link 50. The detection optical signal Ob1 includes a second reflection signal, which is formed by the reflection of the transmit optical signal Ob by the reflection point in the input optical fiber link 50. The detection optical component 41 is also used to receive the detection optical signal Ob1 and determine the peak value and position of the second reflection signal based on the detection optical signal Ob1.

For example, the detected optical signal Ob1 is used to determine the optical x-domain reflectionometry (OxDR) waveform, and then to determine the peak value and position of the second reflected signal. The horizontal axis of the OxDR waveform represents distance, and the vertical axis represents intensity. When the OxDR waveform includes m peaks, the second reflected signal includes m peak values and positions, where m is a positive integer greater than or equal to 1. Specifically, a peak in the OxDR waveform is formed by the reflection of the transmitted optical signal Ob by a reflection point in the input fiber optic link 50. The intensity value and distance corresponding to the top of a peak represent a peak value and position of the reflected signal, and the peak value and position of the reflected signal represent the reflection intensity and position of a reflection point in the input fiber optic link 50. The greater the reflection intensity of a reflection point, the greater its impact on the bit error rate of the service optical signal received by the service optical receiving component 30.

For example, the scanning control unit 46 controls the coupling of the detection optical port _d2 with the service optical input port _i1 . The detection optical component 41 outputs a transmit optical signal Ob according to the second control signal. The transmit optical signal Ob is transmitted to the input optical fiber link 50-1 through the coupled detection optical port _d2 and service optical input port _i1. The transmit optical signal Ob will be scattered and then transmitted in the reverse direction in the input optical fiber link 50-1, which is the detection optical signal Ob1. The detection optical component 41 is also used to receive the detection optical signal Ob1, and to determine the peak value and position of the second reflected signal formed by the reflection of the transmit optical signal Ob by at least one reflection point in the input optical fiber link 50-1 based on the detection optical signal Ob1.

Assuming the OxDR waveform determined by the detection optical component 41 based on the detection optical signal Ob1 is also shown in Figure 3, it can be known that the distance between one reflection point in the input optical fiber link 50-1 and the detection optical component 41 is B1, and the distance between another reflection point in the input optical fiber link 50-1 and the detection optical component 41 is B2. Based on the distance between the fiber optic connector C3 in the input optical fiber link 50-1 and the detection optical component 41 being B1, and the distance between the fiber optic connector C1 in the input optical fiber link 50-1 and the detection optical component 41 being B2, it can be known that the reflection points in the input optical fiber link 50-1 are specifically the reflection points formed by dirt or looseness of the fiber optic connectors C1 and C3.

Similarly, when the detection control unit 46 controls the coupling of the detection optical port _d2 with the service optical input port _i2 , the detection optical component 41 outputs a transmit optical signal Ob according to the second control signal. The transmit optical signal Ob is transmitted to the input optical fiber link 50-2 through the coupled detection optical port _d2 and the service optical input port _i2. The transmit optical signal Ob will be scattered and then transmitted in the reverse direction in the input optical fiber link 50-2, which is the detection optical signal Ob1. The detection optical component 41 is also used to receive the detection optical signal Ob1 and determine the peak value and position of the second reflected signal formed by the reflection of the transmit optical signal Ob by at least one reflection point in the input optical fiber link 50-2 based on the detection optical signal Ob1.

When the detection control unit 46 controls the coupling of the detection optical port _d2 with the service optical input port _in , the detection optical component 41 outputs a transmit optical signal Ob according to the second control signal. The transmit optical signal Ob is transmitted to the input optical fiber link 50-n through the coupled detection optical port _d2 and the service optical input port _in. The transmit optical signal Ob will be scattered and then transmitted in the reverse direction in the input optical fiber link 50-n, which is the detection optical signal Ob1. The detection optical component 41 is also used to receive the detection optical signal Ob1 and determine the peak value and position of the second reflected signal formed by the reflection of the transmit optical signal Ob by at least one reflection point in the input optical fiber link 50-n based on the detection optical signal Ob1.

In this optical cross-connect device 40, the detection optical component 41 receives the detection optical signal Ob1 transmitted from the input optical fiber link 50 through the coupled detection optical port _d2 and the service optical input port. Based on the detection optical signal Ob1, the peak value and position of the second reflected signal are determined. The second reflected signal is output based on at least one reflection point in the input optical fiber link 50. In the example shown in Figure 2, specifically, the detection optical component 41 outputs a transmit optical signal Ob. The transmit optical signal Ob, after being scattered during transmission in the input optical fiber link 50, is then transmitted in the reverse direction to form the detection optical signal Ob1. The detection optical component 41 receives the detection optical signal Ob1 and, based on it, determines the peak value and position of the second reflected signal formed by the reflection of the transmit optical signal Ob by at least one reflection point in the input optical fiber link 50. The second reflected signal may include multiple peak values and positions, and one peak value and position of the second reflected signal represents the reflection intensity and position of a reflection point in the input optical fiber link 50. Furthermore, based on the reflection intensity, it can be determined which reflection points on the input optical fiber link 50 will have a significant impact on the bit error rate of the optical signal received by the service optical receiving component 30. Among them, the detection method of using the detection optical signal Ob1 to determine the position of the reflection point in the input and output optical fiber link 50 is highly efficient and takes less time.

For example, in the optical cross-connect device 40 shown in FIG2, the detection optical component 41 is connected to the detection optical port _d1 , and the detection optical component 41 is connected to the detection optical port _d2 . In one example, referring to FIG4 and FIG6, the optical cross-connect device 40 may also include an optical switch 42; the detection optical component 41 is connected to end a (also referred to as the first end of the optical switch 42), the detection optical port _d1 is connected to end b (also referred to as the second end of the optical switch 42), the detection optical port _d2 is connected to end c (also referred to as the third end of the optical switch 42), and the control end of the optical switch is connected to the scanning control unit 46. The scanning control unit 46 is used to output a first switch control signal to the optical switch 42. Specifically, the detection optical component 41 outputs a transmit optical signal Oa according to the first control signal. The optical switch 42 is used to connect its a-end and b-end according to the first switch control signal, so that the transmit optical signal Oa is transmitted to the output optical fiber link 60 through the a-end, b-end, coupled detection optical port _d1 , and service optical output port of the optical switch 42. The scanning control unit 46 is also used to output a second switch control signal to the optical switch 42. Specifically, the detection optical component 41 outputs a transmit optical signal Ob according to the second control signal. The optical switch 42 is used to connect its a-end and c-end according to the second switch control signal, so that the transmit optical signal Ob is transmitted to the input optical fiber link 50 through the a-end, c-end, coupled detection optical port _d2 , and service optical input port of the optical switch 42. For example, the detection optical component 41 and the optical switch 42 are integrated in the optical cross-connect device 40. The detection optical component 41, the optical switch 42 and the optical cross-connect device 40 are a whole. The detection optical component 41 and the optical switch 42 are fixedly connected. The optical switch 42 is fixedly connected to the detection optical port _d1 , the detection optical port _d2 and the scanning control unit 46.

In another embodiment, referring to Figures 5 and 7, the detection optical component 41 may include a sub-detection optical component 41-1 (also referred to as the first sub-detection optical component) and a sub-detection optical component 41-2 (also referred to as the second sub-detection optical component). Sub-detection optical component 41-1 is connected to detection optical port _d1 , and sub-detection optical component 41-2 is connected to detection optical port _d2 . Sub-detection optical component 41-1 is used to output a transmission optical signal Oa according to a first control signal; sub-detection optical component 41-2 is used to output a transmission optical signal Ob according to a second control signal. Exemplarily, sub-detection optical components 41-1 and 41-2 are integrated in the optical cross-connect device 40. Sub-detection optical components 41-1 and 41-2 and the optical cross-connect device 40 are a whole. Sub-detection optical component 41-1 is fixedly connected to detection optical port _d1 , and sub-detection optical component 41-2 is fixedly connected to detection optical port _d2 .

Specifically, as shown in Figures 4, 5, 6, and 7, the optical cross-connect device 40 also includes an optical cross-connect device 43 and fiber array units 44 (also referred to as the first fiber array unit) and 45 (also referred to as the second fiber array unit) respectively disposed on both sides of the optical cross-connect device 43.

The fiber array unit 44 includes multiple service optical input ports. In the optical cross-connect device 40 shown in Figures 6 and 7, the fiber array unit 44 also includes a monitoring optical transmission port _ia and a monitoring optical reception port _ib . The fiber array unit 45 includes multiple service optical output ports. In the optical cross-connect device 40 shown in Figures 6 and 7, the fiber array unit 44 also includes a monitoring optical transmission port _oa and a monitoring optical reception port _ob .

The optical cross-connect device 43 includes a lens 431, a reflector 432, and a reflector 433. The reflectors 432 and 433 can be, for example, micro-electro-mechanical system (MEMS) reflectors. By rotating the reflector 432 or 433, any service optical input port can be coupled to any service optical output port. Similarly, by rotating the reflector 432 or 433, any service optical output port can be coupled to a monitoring optical transmission port _ia . Furthermore, by rotating the reflector 432 or 433, any service optical input port can be coupled to a monitoring optical transmission port _oa .

As shown in Figures 4 and 5, one of the multiple service optical input ports can be used as the detection optical port _d1 , which is connected to the detection optical component 41 and is not connected to the input fiber optic link 50. Similarly, one of the multiple service optical output ports can be used as the detection optical port _d2 , which is also connected to the detection optical component 41 and is not connected to the output fiber optic link 60. Alternatively, as shown in Figures 6 and 7, the optical cross-connect device 40 can also include a monitoring optical transmission port _ia (also referred to as the first monitoring optical transmission port) and a monitoring optical transmission port _oa (also referred to as the second monitoring optical transmission port). The monitoring optical transmission port _ia is located on the same side as the multiple service optical input ports, and the monitoring optical transmission port _oa is located on the same side as the multiple service optical output ports. The monitoring optical transmission port _ia serves as the detection optical port _d1 , and the monitoring optical transmission port _oa serves as the detection optical port _d2 .

As exemplarily shown in Figures 6 and 7, the optical cross-connect device 43 further includes a beam splitter 434, a lens 435, a reflector 436, a beam splitter 437, a lens 438, and a reflector 439. The beam splitter 434 is disposed on the optical path between the fiber array unit 44 and the reflector 432, and the beam splitter 437 is disposed on the optical path between the fiber array unit 45 and the reflector 433. Each service optical input port is coupled to the monitoring optical receiving port _ib via the optical cross-connect device 43 (specifically, the beam splitter 434, lens 435, and reflector 436 within the optical cross-connect device 43), and each service optical output port is coupled to the monitoring optical receiving port ob via the optical cross-connect device 43 (specifically, the beam splitter 117, lens 118, and reflector 119 within the optical cross-connect device ₄₃ ).

Specifically, as shown in Figure 7, when the optical signal O11 input at the service optical input port _i2 is transmitted to the service optical output port _on via reflector 432, lens 431, and reflector 433, the beam splitter 434 can transmit a portion of the optical signal O11 to lens 435. This portion of the optical signal is focused by lens 435 onto reflector 436, reflected back to lens 435 by reflector 436, and then transmitted to the monitoring optical receiving port _ib via lens 435 and beam splitter 434. The beam splitter 437 can transmit a portion of the optical signal O11 to lens 438. This portion of the optical signal is focused by lens 438 onto reflector 439, reflected back to lens 438 by reflector 439, and then transmitted to the monitoring optical receiving port _ob via lens 438 and beam splitter 437. Of these, a portion of the optical signal O11 is transmitted to the monitoring optical receiving port i _b , a portion of the optical signal O11 is transmitted to the monitoring optical receiving port _ob , and a larger portion of the optical signal O11 is transmitted to the service optical output port _on .

In some embodiments, in the optical cross-connect device 40 shown in Figures 6 and 7, the fiber array unit 44 may further include multiple monitoring optical transmitting ports _ia and multiple monitoring optical receiving ports _{ib. One} of the multiple monitoring optical transmitting ports _ia serves as _a detection optical port _d1 . The other monitoring optical transmitting ports _ia can be connected to monitoring optical transmitting devices to achieve forward detection of the optical cross-connect device 43. Each of the multiple monitoring optical receiving ports _{ib is} coupled to each service optical input port through the optical cross-connect device 43 (specifically, the beam splitter 434, lens 435, and reflector 436 in the optical cross-connect device 43). The fiber array unit 45 also includes multiple monitoring optical transmitting ports _oa and multiple monitoring optical receiving ports _{ob .} One of the multiple monitoring optical transmitting ports _oa serves as a detection optical port _{d2 .} The other monitoring optical transmitting ports _oa can be connected to monitoring optical transmitting devices to achieve reverse detection of the optical cross-connect device 43. Each of the multiple monitoring optical receiving ports _OB is _coupled to each service optical output port through an optical cross-connect device 43 (specifically, the beam splitter 437, lens 438, and reflector 439 in the optical cross-connect device 43).

Specifically, referring to any one of Figures 2, 4 to 7, the scanning control unit 46 controls the coupling of the detection optical port _d1 with the service optical output port. Specifically, the scanning control unit 46 is connected to the reflectors 432 and 433 in the optical cross-connect device 43. The scanning control unit 46 controls the rotation angle of the reflectors 432 and 433 to achieve the coupling of the detection optical port _d1 with the service optical output port. For example, the scanning control unit 46 specifically controls the reflector 432 to rotate to a first angle and the reflector 433 to rotate to a second angle to achieve the coupling of the detection optical port _d1 with the service optical output port _o1. The scanning control unit 46 specifically controls the reflector 432 to rotate to a third angle and the reflector 433 to rotate to a fourth angle to achieve the coupling of the detection optical port _d1 with the service optical output port _o2 …

The scanning control unit 46 controls the coupling of the detection optical port _d2 with the service optical input port. Specifically, the scanning control unit 46 is connected to reflectors 432 and 433 in the optical cross-connect device 43. The scanning control unit 46 controls the rotation angle of reflectors 432 and 433 to achieve the coupling of the detection optical port _d2 with the service optical input port. For example, the scanning control unit 46 specifically controls reflector 432 to rotate to the fifth angle and reflectsor 433 to rotate to the sixth angle to achieve the coupling of the detection optical port _d2 with the service optical input port _i1. The scanning control unit 46 specifically controls reflector 432 to rotate to the seventh angle and reflectsor 433 to rotate to the eighth angle to achieve the coupling of the detection optical port _d2 with the service optical input port _i2 …

For example, referring to FIG8, the detection optical component 41 shown in any of FIG2, FIG4 to FIG7 specifically includes: a signal generator 411, an electro-optic modulator 412, a photoelectric converter 413, a signal processor 414, and an optical transmission device 145. The q end (also referred to as the first end of the optical transmission device 415) of the optical transmission device 415 is connected to the electro-optic modulator 412, the r end of the optical transmission device 415 is connected to the detection optical port _d1 , and the s end (also referred to as the third end of the optical transmission device 415) of the optical transmission device 415 is connected to the photoelectric converter 413. The system includes a signal generator 411 for outputting a transmit electrical signal Sa (also known as a first transmit electrical signal); an electro-optic modulator 412 for outputting a transmit optical signal Oa based on the transmit electrical signal Sa; an optical transmission device 415 for receiving the transmit optical signal Oa through its q terminal and transmitting it to the detection optical port _d1 through its r terminal; the optical transmission device 415 is also used to receive a detection optical signal Oa1 through the detection optical port _d1 and transmitting it to the photoelectric converter 413 through its s terminal; the photoelectric converter 413 for outputting a detection electrical signal Sa1 based on the detection optical signal Oa1; and a signal processor 414 for determining the peak value and position of the first reflected signal based on the detection electrical signal Sa1.

The transmitted electrical signal Sa includes a first detection sequence, which includes any of the following: a linear frequency modulated signal, a constant envelope zero autocorrelation signal, or a step frequency signal. The step frequency signal is also called a frequency hopping signal.

Specifically, when the transmitted electrical signal Sa includes a first detection sequence, which includes a linear frequency modulated signal or a stepped frequency signal, the signal processor 414 is specifically used to determine a first frequency domain signal (i.e., time-frequency conversion) based on the detected electrical signal Sa1, and to determine the peak value and position of the first reflected signal based on the peak value and time delay of the first frequency domain signal. The relationship between the time delay and the distance in the OxDR waveform is that the time delay multiplied by the speed of light divided by 2 equals the distance. The peak value and time delay of the first frequency domain signal are specifically represented by the OxDR waveform.

For example, when the first detection sequence specifically includes a linear frequency modulated signal, the signal processor 414 will first dechirp (i.e. deskew) or match filter the detection electrical signal Sa1, and then determine the first frequency domain signal based on the dechirped or matched filtered detection electrical signal Sa1. This can make the peak value and position of the subsequently determined first reflection signal more accurate.

When the first detection sequence includes a constant envelope zero autocorrelation signal, the signal processor 414 is specifically used to correlate one of the detection electrical signal Sa1 and the first interference signal with one of the transmitted electrical signal Sa and the first hard-decision electrical signal to determine the peak value and position of the first correlation peak, and to determine the peak value and position of the first reflected signal based on the peak value and position of the first correlation peak. The first hard-decision electrical signal is an electrical signal generated by hard-decision analysis of the detection electrical signal Sa1; the difference between the detection electrical signal Sa1 and the hard-decision electrical signal is the first interference electrical signal. For example, the correlation can be between the detection electrical signal Sa1 and the transmitted electrical signal Sa, or between the detection electrical signal Sa1 and the first hard-decision electrical signal, or between the first interference electrical signal and the transmitted electrical signal Sa, or between the first interference electrical signal and the first hard-decision electrical signal. The peak value and position of the first correlation peak are specifically represented by an OxDR waveform. The first correlation peak may include one or more peaks, and the peak value and position of one of the first correlation peaks correspond to the peak value and position of the first reflected signal.

Specifically, the signal processor 414 can obtain the transmitted electrical signal Sa from the signal generator 411.

The optical transmission device 415 includes a duplexer or a circulator. The duplexer's frequency is related to the transmission optical signal Oa and the detection optical signal Oa1. Specifically, when the q-terminal of the duplexer receives the transmission optical signal Oa, it outputs the transmission optical signal Oa from the r-terminal of the duplexer according to the frequency of the transmission optical signal Oa. When the r-terminal of the duplexer receives the detection optical signal Oa1, it outputs the detection optical signal Oa1 from the s-terminal of the duplexer according to the frequency of the detection optical signal Oa1. In this example, the transmission optical signal Oa returns to the detection optical component 41 via the output fiber optic link 60 as the detection optical signal Oa1; therefore, the transmission optical signal Oa and the detection optical signal Oa1 have the same frequency.

A looper is a three-port device, specifically, the optical signal input to the q terminal of the looper is output through the r terminal of the looper, the optical signal input to the r terminal of the looper is output through the s terminal of the looper, and the optical signal input to the s terminal of the looper is output through the q terminal of the looper.

For example, referring to FIG8, the detection optical component 41 may further include a signal sampler 410 disposed between the photoelectric converter 413 and the signal processor 414; the signal sampler 410 is used to sample the detection electrical signal Sa1. For example, the signal sampler 410 may be an analog to digital converter (ADC), and the signal sampler 410 specifically downsamples the detection electrical signal Sa1, which can sample the detection electrical signal into a single detection electrical signal Sa1 or a multiple detection electrical signal Sa1.

For example, referring to Figure 8, the detection optical component 41 may further include a detection result determination device 400. The detection result determination device 400 receives the peak value and position of the first reflected signal, and, in conjunction with the topology of the output optical fiber link 60, determines whether a fault exists in the output optical fiber link 60 and the position of the reflection point in the output optical fiber link 60. Since the detection result determination device 400 is located within the detection optical component 47, it can report the position of the reflection point to the scanning control unit 46, or to the controller 70 of the optical switching network 200, or to the network management system, server, etc., of the optical switching network 200. Maintenance personnel of the optical switching network 200 can obtain the reflection point position determined by the detection result determination device 400 and repair the optical fiber connector forming the reflection point based on the reflection point position.

When the detection optical component 41 does not include the detection result determination device 400, the function of the detection result determination device 400 can be integrated into the scanning control unit 46 in the optical cross-connect device 40, or into the controller 70 of the optical switching network 200 shown in FIG2.

For example, when the photoelectric converter 413 has high sensitivity, or the signal sampler 410 has good performance (e.g., when the signal sampler 410 is an ADC, the ADC has a high digital quantization bit width), the signal processor 414 is also used to determine the location and insertion loss value of the insertion point in the output optical fiber link 60 based on the detected electrical signal Sa1. This allows the optical cross-connect device 40 to determine the location and insertion loss value of the insertion point in the output optical fiber link 60 based on the detected optical signal Oa1.

For example, the process of detecting the optical component 41 outputting and transmitting optical signal Ob can be referred to the process of detecting the optical component 41 outputting and transmitting optical signal Oa, and will not be described in detail here. Furthermore, the structure of the sub-detection optical component 41-1 is the same as that of the detection optical component 41, and it specifically performs the process of outputting and transmitting optical signal Oa. Similarly, the structure of the sub-detection optical component 41-2 is the same as that of the detection optical component 41, and it specifically performs the process of outputting and transmitting optical signal Ob.

Referring back to Figure 2, the optical switching network 200 also includes a controller 70, which is connected to both the service optical receiving component 30 and the optical cross-connect device 40; the optical cross-connect device 40 is the optical cross-connect device 40 shown in any one of Figures 4 to 7. For example, the controller 70 is also connected to the service optical transmitting component 20.

When the optical cross-connect device 40 needs to sequentially output optical signal Oa to each output optical fiber link 60, the controller 70 is used to output a first scan control signal to the optical cross-connect device 40. In the optical cross-connect device 40 shown in any of Figures 4 to 7, the first scan control signal is used to control the scan control unit 46 to couple each of the multiple service optical output ports to the detection optical port _d1 in a time-division manner. The first scan control signal is also used to control the scan control unit 46 to output a first control signal to the detection optical component 41 in a time-division manner.

When the optical cross-connect device 40 needs to output and transmit optical signal Ob to each input optical fiber link 50 in sequence, the controller 70 is also used to output a second scan control signal to the optical cross-connect device 40. In the optical cross-connect device 40 shown in any of Figures 4 to 7, the second scan control signal is used to control the scan control unit 46 to couple each of the multiple service optical input ports to the detection optical port _d2 in a time-division manner. The second scan control signal is also used to send a second control signal to the detection optical component 41 in a time-division manner.

For example, before the optical switching network 200 starts working, also known as before the service goes online, the controller 70 first outputs a first scan control signal, and then outputs a second scan control signal.

In other embodiments, when the controller 70 determines that the bit error rate of the optical signal received by the service optical receiving component 30 is high, the controller 70 first outputs a first scan control signal and then outputs a second scan control signal to determine which input optical fiber link 50 or output optical fiber link 60 has a reflection point.

When the controller 70 determines that the bit error rate of the optical signal received by the service optical receiving component 30 is high, and the faulty input optical fiber link 50 and the faulty output optical fiber link 60 connected to the service optical receiving component 30 are known, the controller 70 may also output a detection control signal to the scanning control unit 46. The detection control signal controls the scanning control unit 46 to couple the service optical output port connected to the faulty output optical fiber link 60 with the detection optical port _d1 , and controls the detection optical component 41 to output a transmission optical signal Oa to the faulty output optical fiber link 60. The detection control signal also controls the scanning control unit 46 to couple the service optical input port connected to the faulty input optical fiber link 50 with the detection optical port _d2 , and controls the detection optical component 41 to output a transmission optical signal Ob to the faulty input optical fiber link 50.

For example, when the controller 70 controls the output of the first scan control signal or the second scan control signal, the controller 70 controls the service optical transmission component 20 not to output the service optical signal.

In another example, referring to FIG9, compared to the optical cross-connect device 40 shown in FIG2, the optical cross-connect device 40 shown in FIG9 includes: a scanning control unit 46, a detection optical port _d1 and a detection optical component 41 (referred to as the first detection optical component), the detection optical component 41 being connected to the detection optical port _d1 and the detection optical component 41 being connected to the scanning control unit 46.

The scanning control unit 46 is used to control the coupling between the detection optical port _d1 and the service optical output port, and to output a first control signal to the detection optical component 41.

The detection optical component 41 is used to output a transmit optical signal Oa (also referred to as the first transmit optical signal) according to the first control signal. The transmit optical signal Oa is transmitted to the output optical fiber link 60 through the coupled detection optical port _d1 and the service optical output port. After being transmitted through the output optical fiber link 60, the transmit optical signal Oa becomes the detection optical signal Oa1. The detection optical signal Oa1 is used to determine the peak value and position of the first reflected signal. The first reflected signal is output based on at least one reflection point in the output optical fiber link 60.

Specifically, in the optical cross-connect device 40 shown in Figure 9, the service optical receiving component 30 receives the detection optical signal Oa1. After the detection optical component 41 outputs the transmit optical signal Oa, the transmit optical signal Oa is transmitted to the service optical receiving component 30 through the output optical fiber link 60. All optical signals received by the service optical receiving component 30 are referred to as the detection optical signal Oa1. The detection optical signal Oa1 includes the first reflected signal output by the reflection cavity formed by at least two reflection points in the detection optical component 41 and the output optical fiber link 60. For example, in Figure 9, assuming that fiber optic connectors C5 and C6 are dirty or loose, forming reflection points, a portion of the transmit optical signal Oa is reflected when it is transmitted to fiber optic connector C6. This reflected portion of the optical signal is then transmitted to fiber optic connector C5 and reflected again, forming the first reflected signal. The transmission direction of the detection optical signal Oa1 is the same as that of the transmit optical signal Oa, and the transmission direction of the first reflected signal is also the same as that of the transmit optical signal Oa. The service optical receiving component 30 determines the peak value and position of the first reflected signal based on the detection optical signal Oa1.

For example, the detected optical signal Oa1 is used to determine the optical x-domain analyzer (OxDA) waveform (x-domain can be frequency domain or time domain, etc.), and then to determine the peak value and position of the first reflected signal. The horizontal axis of the OxDA waveform represents distance, and the vertical axis represents intensity. The OxDA waveform includes m peaks, and the first reflected signal includes m peak values and positions, where m is a positive integer greater than or equal to 1. Specifically, a peak is output from the reflective cavity formed by two reflection points in the detection optical component 41 and the output fiber optic link 60. The intensity value and distance corresponding to the top of a peak represent a peak value and position of the first reflected signal, and this peak value and position represent the reflection intensity and cavity length of the reflective cavity formed by the two reflection points in the detection optical component 41 and the output fiber optic link 60. The greater the reflection intensity of the reflective cavity formed by the two reflection points, the greater the impact of this reflective cavity on the bit error rate of the optical signal received by the service optical receiving component 30.

For example, the scanning control unit 46 controls the coupling of the detection optical port _d1 with the service optical output port _o1 . The detection optical component 41 outputs a transmit optical signal Oa according to the first control signal. The transmit optical signal Oa is transmitted to the output optical fiber link 60-1 through the coupled detection optical port _d1 and the service optical output port _o1. The transmit optical signal Oa is transmitted to the service optical receiving component 30-1 through the output optical fiber link 60-1 as the detection optical signal Oa1. The service optical receiving component 30-1 determines the peak value and position of the first reflected signal based on the detection optical signal Oa1. The first reflected signal is output by the reflective cavity formed by at least two reflection points in the detection optical component 41 and the output optical fiber link 60-1.

Among them, the OxDR waveform diagram determined by the service optical receiving component 30-1 based on the detected optical signal Oa1 is shown in Figure 10. For example, according to the peaks in Figure 10, one peak and position of the first reflected signal is (A3, B3), and another peak and position is (A4, B4). When the distance represented by the horizontal axis is the product of time and light speed divided by 2, it can be known that the cavity length of the reflection cavity formed by the two reflection points in the detection optical component 41 and the output optical fiber link 60-1 is B3, the reflection intensity is A3, and the cavity length of the reflection cavity formed by the two reflection points is B4, and the reflection intensity is A4.

For example, the reflection intensity of the reflection cavity formed by the two reflection points can be the product of the return loss (linear) of the two reflection points, or the value of the reflection intensity formed by the two reflection points can be the sum of the return loss (in dB) of the two reflection points.

For example, when the cavity length of the reflective cavity formed by the two reflection points in the detection optical component 41 and the output optical fiber link 60-1 is known to be B3, based on the distance B3 between the fiber optic connectors C5 and C6 in the output optical fiber link 60-1, it can be known that the reflection points in the detection optical component 41 and the output optical fiber link 60-1 are specifically reflection points formed by dirt or looseness of the fiber optic connectors C5 and C6. When the cavity length of the reflective cavity formed by the two reflection points in the detection optical component 41 and the output optical fiber link 60-1 is known to be B4, based on the distance B4 between the fiber optic connectors C7 and C8 in the output optical fiber link 60-1, it can be known that the reflection points in the detection optical component 41 and the output optical fiber link 60-1 are specifically reflection points formed by dirt or looseness of the fiber optic connectors C7 and C8.

In some embodiments, the horizontal axis of the OxDA waveform represents the distance as the product of time and the speed of light. In this case, when a peak and position of the first reflected signal are known to be (A3, B3), the peak and position indicate that the cavity length of the reflection cavity formed by the two reflection points in the detection optical component 41 and the output optical fiber link 60-1 is B3/2, and the reflection intensity is A3.

Similarly, when the scanning control unit 46 controls the coupling of the detection optical port _d1 with the service optical output port _o2 , the detection optical component 41 outputs a transmission optical signal Oa according to the first control signal. The transmission optical signal Oa is transmitted to the output optical fiber link 60-2 through the coupled detection optical port _d1 and the service optical output port _o2. The transmission optical signal Oa is transmitted to the service optical receiving component 30-2 through the output optical fiber link 60-2 as the detection optical signal Oa1. The service optical receiving component 30-2 determines the peak value and position of the first reflected signal according to the detection optical signal Oa1. The first reflected signal is output by the reflection cavity formed by at least two reflection points in the detection optical component 41 and the output optical fiber link 60-2.

When the scanning control unit 46 controls the coupling of the detection optical port _d1 with the service optical output port _on , the detection optical component 41 outputs a transmission optical signal Oa according to the first control signal. The transmission optical signal Oa is transmitted to the output optical fiber link 60-n through the coupled detection optical port _d1 and the service optical output port _on. The transmission optical signal Oa is transmitted to the service optical receiving component 30-n through the output optical fiber link 60-n as the detection optical signal Oa1. The service optical receiving component 30-n determines the peak value and position of the first reflected signal according to the detection optical signal Oa1. The first reflected signal is output by the reflection cavity formed by at least two reflection points in the detection optical component 41 and the output optical fiber link 60-n.

In the optical cross-connect device 40, the scanning control unit 46 controls the coupling of the detection optical port _d1 with the service optical output port and outputs a first control signal to the detection optical component 41. The detection optical component 41 outputs a transmit optical signal Oa (also referred to as the first transmit optical signal) according to the first control signal. The transmit optical signal Oa is transmitted to the output optical fiber link 60 through the coupled detection optical port _d1 and the service optical output port. After transmission through the output optical fiber link 60, the transmit optical signal Oa becomes a detection optical signal Oa1 (also referred to as the first detection optical signal). The detection optical signal Oa1 is used to determine the peak value and position of the first reflected signal. The first reflected signal is output based on at least one reflection point in the output optical fiber link 60. In the example shown in Figure 9, specifically, the detection optical component 41 outputs the transmit optical signal Oa, the service optical receiving component 30 receives the detection optical signal Oa1, and determines the peak value and position of the first reflected signal based on the detection optical signal Oa1. The first reflected signal is output from the reflection cavity formed by two reflection points in the detection optical component 41 and the output optical fiber link 60. The first reflected signal may include multiple peaks and positions. One peak and position of the first reflected signal represents the reflection intensity and position of the reflecting cavity formed by two reflection points in the detection optical component 41 and the output optical fiber link 60. Based on the reflection intensity, it can be determined which reflection points on the output optical fiber link 60 will have a significant impact on the bit error rate of the optical signal received by the service optical receiving component 30. Using the detection optical signal Oa1 to determine the position of the reflection points in the output optical fiber link 60 is a highly efficient and time-saving detection method.

For example, as shown in FIG9, when the optical switching network 200 further includes multiple service optical transmission components 20 and the optical cross-connect device 40 further includes multiple service optical input ports, the optical cross-connect device 40 further includes a detection optical port _d2 (also referred to as the second detection optical port) and a detection optical component 47 (referred to as the second detection optical component), and the detection optical component 47 is connected to the detection optical port _d2 .

The detection optical component 47 is used to receive the detection optical signal Ob1 (also known as the second detection optical signal) transmitted from the input optical fiber link 50 to the detection optical component 47 through the coupled detection optical port _d2 and the service optical input port, and to determine the peak value and position of the second reflection signal based on the detection optical signal Ob1; wherein, the second reflection signal is output based on at least one reflection point in the input optical fiber link 50.

Specifically, in the optical cross-connect device 40 shown in Figure 9, the service optical transmission component 20 outputs a transmit optical signal Ob. This transmit optical signal Ob, after being transmitted through the input optical fiber link 50, becomes a detection optical signal Ob1. Specifically, the transmit optical signal Ob transmitted through the input optical fiber link 50 to the detection optical component 47 becomes the detection optical signal Ob1. All optical signals received by the detection optical component 47 are referred to as the detection optical signal Ob1. The detection optical signal Ob1 includes a second reflected signal output from a reflection cavity formed by at least two reflection points in the detection optical component 47 and the output optical fiber link 60. For example, in Figure 9, assuming that fiber optic connectors C1 and C2 are dirty or loose, forming reflection points, a portion of the transmit optical signal Ob is reflected when transmitted to fiber optic connector C2. This reflected portion is then transmitted to fiber optic connector C1 and reflected again, forming the second reflected signal. The detection optical signal Ob1 and the transmit optical signal Ob have the same transmission direction, and the second reflected signal also has the same transmission direction. The detection optical component 47 is used to determine the peak value and position of the second reflected signal based on the detection optical signal Ob1; wherein the second reflected signal is output by the reflection cavity formed by at least two reflection points in the detection optical component 47 and the input optical fiber link 50.

The detection optical component 47 uses the detection optical signal Ob1 to determine the optical x-domain analyzer (OxDA) waveform, and then determines the peak value and position of the second reflected signal. The horizontal axis of the OxDA waveform represents distance, and the vertical axis represents intensity. Since the OxDA waveform contains m peaks, the second reflected signal also contains m peak values and positions, where m is a positive integer greater than or equal to 1. Specifically, a peak is output from the reflection cavity formed by two reflection points in the detection optical component 47 and the input fiber optic link 50. The intensity value and distance corresponding to the top of a peak represent a peak value and position of the second reflected signal. Furthermore, a peak value and position of the second reflected signal represent the reflection intensity and cavity length of the reflection cavity formed by the two reflection points in the detection optical component 47 and the input fiber optic link 50. The greater the reflection intensity of the reflection cavity formed by the two reflection points, the greater the impact of this reflection cavity on the bit error rate of the optical signal received by the service optical receiving component 30.

For example, the detection optical port _d2 shown in Figure 9 can be coupled to any one of the service optical input ports _i1 , _i2, ..., _in .

The following explanation uses the coupling of the detection optical port _d2 and the service optical input port _i1 as an example. The service optical transmitting component 20-1 outputs a transmit optical signal Ob. This transmit optical signal Ob is transmitted to the detection optical component 47 as the detection optical signal Ob1 via the input fiber optic link 50-1, the coupled service optical input port _i1 , and the detection optical port _d2. The detection optical component 47 is used to determine the peak value and position of the second reflected signal based on the detection optical signal Ob1. The second reflected signal is output from a reflective cavity formed by at least two reflection points in the detection optical component 47 and the input fiber optic link 50-1.

Assuming the OxDR waveform determined by the detection optical component 47 based on the detection optical signal Ob1 is also shown in Figure 10, then the cavity length of the reflection cavity formed by the detection optical component 47 and the two reflection points in the input optical fiber link 50-1 is B3, and the cavity length of the reflection cavity formed by the other two reflection points is B4. Based on the distance between fiber optic connectors C1 and C2 in the input optical fiber link 50-1 being B3, and the distance between fiber optic connectors C3 and C4 in the input optical fiber link 50-1 being B4, it can be known that the reflection points in the input optical fiber link 50-1 are specifically reflection points formed by dirt or looseness of fiber optic connectors C1, C2, C3, and C4.

Similarly, when the detection optical port _d2 is coupled to the service optical input port _i2 , the service optical transmitting component 20-2 outputs a transmit optical signal Ob. The transmit optical signal Ob is transmitted to the detection optical component 47 as a detection optical signal Ob1 via the input fiber optic link 50-2, the coupled service optical input port _i2, and the detection optical port _d2. The detection optical component 47 is used to determine the peak value and position of the second reflected signal based on the detection optical signal Ob1. The second reflected signal is output from a reflective cavity formed by at least two reflection points in the detection optical component 47 and the input fiber optic link 50-2. When the detection optical port _d2 is coupled to the service optical input port _in , the service optical transmitting component 20-n outputs a transmit optical signal Ob. The transmit optical signal Ob is transmitted to the detection optical component 47 as a detection optical signal Ob1 via the input fiber optic link 50-n. The detection optical component 47 is used to determine the peak value and position of the second reflected signal based on the detection optical signal Ob1. The second reflected signal is output from a reflective cavity formed by at least two reflection points in the detection optical component 47 and the input fiber optic link 50-n.

In this optical cross-connect device 40, the detection optical component 47 receives the detection optical signal Ob1 transmitted from the input optical fiber link 50 through the coupled detection optical port _d2 and the service optical input port. Based on the detection optical signal Ob1, the peak value and position of the second reflected signal are determined. The second reflected signal is output based on at least one reflection point in the input optical fiber link 50. In the example shown in Figure 9, specifically, the service optical transmitting component 20 outputs a transmitting optical signal Ob, and the detection optical component 47 receives the detection optical signal Ob1. Based on the detection optical signal Ob1, the peak value and position of the second reflected signal are determined. The second reflected signal is output from a reflection cavity formed by the detection optical component 47 and two reflection points in the input optical fiber link 50. The second reflected signal may include multiple peak values and positions, and one peak value and position of the second reflected signal represents the reflection intensity and cavity length of the reflection cavity formed by the detection optical component 47 and two reflection points in the input optical fiber link 50-n. Furthermore, based on the reflection intensity, it can be determined which reflection cavities on the input optical fiber link 50 will have a significant impact on the bit error rate of the optical signal received by the service optical receiving component 30. Among them, the detection method of using the detection optical signal Ob1 to determine the positions of at least two reflection points in the detection optical component 47 and the input optical fiber link 50-n is highly efficient and takes less time.

For example, as shown in Figures 11, 12, and 13, the optical cross-connect device 40 further includes an optical cross-connect device 43 and fiber array units 44 (also referred to as the first fiber array unit) and 45 (also referred to as the second fiber array unit) respectively disposed on both sides of the optical cross-connect device 43. The structure and function of the optical cross-connect device 43 can be referred to the structure and function of the optical cross-connect device 43 shown in any one of Figures 4, 5, 6, and 7. The optical cross-connect device 43 includes a lens 431, a reflector 432, a reflector 433, a beam splitter 434, a lens 435, a reflector 436, a beam splitter 437, a lens 438, and a reflector 439. The structure of the fiber array unit 44 can be referred to the structure of the fiber array unit 44 shown in any one of Figures 4, 5, 6, and 7. The fiber array unit 44 includes multiple service optical input ports, a monitoring optical transmission port _ia , and a monitoring optical reception port _ib . The structure of the fiber optic array unit 45 can be referred to in any of Figures 4, 5, 6, and 7. The fiber optic array unit 45 includes multiple service optical output ports, a monitoring optical transmission port o _a , and a monitoring optical reception port o _b . Further details are omitted here.

Based on the structure of optical switching device 43, fiber array unit 44, and fiber array unit 45, it can be seen that the scanning control unit 46 controls the coupling of detection optical port _d1 with the service optical output port, and detection optical port _d2 can be coupled with any one of the service optical input ports _i1 , _i2 , ..., _in . In the first embodiment, referring to FIG11, one of the multiple service optical input ports can be used as detection optical port _d1 , and one of the multiple service optical output ports can be used as detection optical port _d2 . In the second embodiment, referring to FIG12, the monitoring optical transmitting port _ia can be used as detection optical port _d1 , and the monitoring optical receiving port _ib can be used as detection optical port _d2 . In the third embodiment, referring to FIG13, the monitoring optical transmitting port _ia can be used as detection optical port _d1 , and the monitoring optical receiving port _ib can be used as detection optical port _d2 .

Specifically, in the optical cross-connect device 40 shown in Figure 11, the scanning control unit 46 is used to control the coupling of the detection optical port _d1 with the service optical output port, and the scanning control unit 46 is also used to control the coupling of the detection optical port _d2 with the service optical input port. Specifically, the scanning control unit 46 is connected to the reflectors 432 and 433 in the optical cross-connect device 43. The scanning control unit 46 controls the rotation angle of the reflectors 432 and 433 to control the coupling of the detection optical port _d1 with the service optical output port, and the scanning control unit 46 controls the rotation angle of the reflectors 432 and 433 to control the coupling of the detection optical port _d2 with the service optical input port.

Specifically, in the optical cross-connect device 40 shown in Figure 12, the scanning control unit 46 is used to control the coupling of the detection optical port _d1 with the service optical output port. Since each service optical input port is coupled to the monitoring optical receiving port _ib through the optical cross-connect device 43 (specifically, the beam splitter 434, lens 435, and reflector 436 in the optical cross-connect device 43), the scanning control unit 46 does not need to control the coupling of the detection optical port _d2 with the service optical input port.

Specifically, in the optical cross-connect device 40 shown in Figure 13, the scanning control unit 46 is used to control the coupling of the detection optical port _d1 with the service optical output port. Since each service optical output port is coupled to the monitoring optical receiving port _ob through the optical cross-connect device 43 (specifically, the beam splitter 437, lens 438, and reflector 439 in the optical cross-connect device 43), the scanning control unit 46 needs to control the coupling of the service optical transmitting port with the service optical input port to realize the coupling of the detection optical port _d2 with the service optical transmitting port.

For example, referring to FIG14, the detection optical component 41 shown in any of FIG9, FIG11, FIG12 and FIG13 specifically includes: a signal generator 411 and an electro-optic modulator 412; the signal generator 411 is used to output a transmission electrical signal Sa (also referred to as a first transmission electrical signal); the electro-optic modulator 412 is used to output a transmission optical signal Oa (also referred to as a first transmission optical signal) according to the transmission electrical signal Sa.

For example, the transmitted electrical signal Sa includes a second detection sequence, or the transmitted electrical signal Sa includes a second detection sequence and a first service electrical signal, wherein the byte containing the second detection sequence is different from the byte containing the first service electrical signal; or the second detection sequence is a modulation signal of the first service electrical signal. The second detection sequence includes any of the following: a linear frequency modulated signal, a constant envelope zero autocorrelation signal, or a step frequency signal.

Among them, when the transmitted electrical signal Sa is different, the processing method of the service optical receiving component 30 to process the detected electrical signal Sa1 to obtain the OxDA waveform is also different.

For example, the detection optical signal Oa1 is used to determine the peak value and position of the first reflected signal. The first reflected signal is output by a reflective cavity formed by at least two reflection points in the detection optical component 41 and the output optical fiber link 60. At this time, the known peak value and position of the second reflected signal is (A3, B3), which indicates that the cavity length of the reflective cavity formed by the two reflection points in the detection optical component 41 and the output optical fiber link 60 is B3 and the reflection intensity is A3. These two reflection points can both be reflection points in the output optical fiber link 60, or one of these two reflection points is a reflection point located in the detection optical component 41 and the other reflection point is a reflection point in the output optical fiber link 60.

Assuming both reflection points are reflection points in the output fiber optic link 60, the specific location of the reflection point in the input fiber optic link 50 can be determined based on the cavity length B3 of the reflection cavity formed by the two reflection points. However, referring to Figure 9, the output fiber optic link 60 is specifically output fiber optic link 60-1. In output fiber optic link 60-1, if the distance between fiber optic connectors C5 and C6 is B3, and the distance between fiber optic connectors C7 and C8 is also B3, then the cavity length B3 cannot clearly determine whether the reflection cavity is formed between fiber optic connectors C5 and C6, or between fiber optic connectors C7 and C8. Therefore, manual inspection and adjustment of one or more of fiber optic connectors C5, C6, C7, and C8 are required.

For example, in order to more accurately locate the reflection point in the output optical fiber link 60, referring to FIG14, the embodiments of this application provide that a reflection component 416 (also referred to as the first reflection component) is provided in the detection optical component 41, such that one of the two reflection points is the reflection point formed by the reflection component 416 in the detection optical component 41, and the other reflection point is the reflection point in the output optical fiber link 60. Therefore, the cavity length of the reflection cavity formed between the two reflection points is the length of the distance between the reflection point in the output optical fiber link 60 and the reflection component 416 in the detection optical component 41, thereby enabling the accurate location of the reflection point in the output optical fiber link 60 based on the peak value and position of the first reflection signal.

For example, as shown in FIG14, the detection light assembly 41 further includes a reflection assembly 416 and an isolator 417 disposed between the electro-optic modulator 412 and the reflection assembly 416.

Isolator 417 is used to transmit the transmitted optical signal Oa from electro-optic modulator 412 to reflective component 416; reflective component 416 is used to transmit the transmitted optical signal Oa from isolator 417 to detection optical port _d1 .

The reflector 416 is also used to receive the transmitted optical signal Oa reflected back through the output optical fiber link 60, and transmit a portion of the reflected transmitted optical signal Oa to the isolator 417, and transmit another portion of the reflected transmitted optical signal Oa to the output optical fiber link 60. The isolator 417 is used to block a portion of the reflected transmitted optical signal Oa from the reflector 416, so that the portion of the reflected transmitted optical signal Oa will not affect the performance of the electro-optic modulator 412.

As exemplarily shown in FIG15, the reflective assembly 416 includes a polarizing beam splitter 4161 and a reflective film 4162. The reflective film 4162 is disposed on a first surface of the polarizing beam splitter 4161, a second surface of the polarizing beam splitter 4161 faces the isolator 417, and a third surface of the polarizing beam splitter 4161 is away from the isolator 417. The reflectivity of the reflective film 4162 is greater than or equal to 1%.

For example, a lens 418 is typically provided in the detection light assembly 41. The lens 418 is used to focus the transmitted light signal Oa from the reflection assembly 416 and transmit it to the detection light port _d1 , and to focus the transmitted light signal Oa reflected back from the detection light port _d1 and transmit it to the reflection assembly 416.

In another example, referring to FIG16, the reflective assembly 416 includes a looper 4163 and a coupler 4164. An isolator 417 is connected to the h-end (also referred to as the first end of the looper 4163), the j-end (also referred to as the second end of the looper 4163) is connected to the n-end (also referred to as the first end of the coupler 4164), the m-end (also referred to as the second end of the coupler 4164) is connected to the detection port _d1 , and the p-end (also referred to as the third end of the coupler 4164) is connected to the k-end (also referred to as the third end of the looper 4163). Specifically, the optical signal input at the h terminal of circulator 4163 will be output through the j terminal of circulator 4163, the optical signal input at the j terminal of circulator 4163 will be output through the k terminal of circulator 4163, and the optical signal input at the k terminal of circulator 4163 will be output through the h terminal of circulator 4163; of the optical signal input at the m terminal of coupler 4164, part of the optical signal will be output through the n terminal of coupler 4164, and part of the optical signal will be output through the p terminal of coupler 4164.

In other examples, referring to FIG17, the detection optical assembly 41 further includes a multiplexer 419 disposed between the reflector 416 and the isolator 417. For example, when the detection optical assembly 41 includes multiple electro-optic modulators 412, and the multiple electro-optic modulators 412 can output transmit optical signals of different wavelengths, the multiplexer 419 can multiplex the multiple transmit optical signals of different wavelengths into a wavelength division multiplexed transmit optical signal, and then transmit the wavelength division multiplexed transmit optical signal to the detection optical port _d1 . At this time, the reflector 416 includes a reflective film 4165, and the reflector 416 (specifically the reflective film 4165) is disposed on the side of the multiplexer 419 facing the detection optical port _d1 . That is, the reflective film 4165 is disposed on the side of the multiplexer 416 facing the detection optical port _d1 .

In some examples, as shown with reference to FIG18, the detection light assembly 41 may not have a multiplexer, and the reflection assembly 416 includes a reflective film 4165, which is disposed on the side of the isolator 417 away from the isolator 417.

In the detection optical assembly 41 shown in Figures 17 and 18, the reflectivity of the reflective film 4165 is greater than or equal to 1%. In one example, the reflectivity of the reflective film 4165 can be 10%. For example, to detect a reflection signal with a large peak value, the reflectivity of the reflective film 4165 can be set to 10%, which is approximately -10 dB. This ensures that the peak value of the reflection signal output from the reflection cavity formed by the reflection component 416 in the detection optical assembly 41 and the reflection point in the output optical fiber link 60 is large. In another example, the reflectivity of the reflective film 4165 can be 1%. For another example, the reflectivity of the reflective film 4165 can be 55%. For yet another example, the reflectivity of the reflective film 4142 can be 80%. Furthermore, the reflectivity of the reflective film 4165 can be set relatively high.

For example, referring to Figure 19, the detection optical component 47 shown in any of Figures 9, 11, 12, and 13 specifically includes a photoelectric converter 471 and a signal processor 472. The photoelectric converter 471 receives the detection optical signal Ob1 and outputs a detection electrical signal Sb1 based on the detection optical signal Ob1. For example, the photoelectric converter 471 can be various devices that convert optical signals into electrical signals, such as photodiodes, phototransistors, PIN diodes, avalanche photodiodes (APDs), etc. The signal processor 472 determines the peak value and position of the second reflected signal based on the detection electrical signal Sb1. The second reflected signal is output from the reflection cavity formed by at least two reflection points in the detection optical component 47 and the input optical fiber link 50. Specifically, the signal processor 472 can obtain the OxDA waveform shown in Figure 10 based on the detection electrical signal Sb1, and then determine the peak value and position of the second reflected signal.

For example, the service optical transmission component 20 specifically outputs a transmission optical signal Ob based on the transmission electrical signal Sb, wherein the transmission electrical signal Sb in the service optical transmission component 20 includes a third detection sequence. Alternatively, the transmission electrical signal Sb includes the third detection sequence and a second service electrical signal.

When transmitting electrical signal Sb, which includes a third detection sequence and a second service optical signal, in the first case, the byte containing the third detection sequence is different from the byte containing the second service electrical signal, and both the service optical transmission component 20 and the signal processor 472 in the detection optical component 47 know the byte containing the second detection sequence. In the second case, the third detection sequence is the modulation signal of the second service electrical signal.

The third detection sequence includes any of the following: a linear frequency modulation (LFM) signal, a constant amplitude zero autocorrelation (CAZAC) signal, or a step frequency signal. The step frequency signal is also known as a frequency hopping signal.

Specifically, the processing method of the signal processor 472 to process the detection signal Sb1 to obtain the OxDA waveform varies depending on the transmitted electrical signal Sb. For example, when the third detection sequence includes a linear frequency modulated signal or a step frequency signal, regardless of whether the transmitted electrical signal Sb includes the third detection sequence or includes both the third detection sequence and the second service electrical signal (specifically, the bytes containing the third detection sequence and the bytes containing the second service electrical signal are different), the signal processor 472 is specifically used to determine the second frequency domain signal (i.e., time-frequency conversion) based on the detection electrical signal Sb1, and to determine the peak value and position of the second reflected signal based on the peak value and time delay of the second frequency domain signal. The peak value and time delay of the second frequency domain signal are specifically reflected in the OxDA waveform, and the relationship between the time delay and the distance in the OxDA waveform is that the time delay multiplied by the speed of light divided by 2 equals the distance.

For example, when the third detection sequence specifically includes a linear frequency modulated signal, the signal processor 472 will first dechirp (i.e. de-skew) or match filter the detection electrical signal Sb1, and then determine the frequency domain signal based on the dechirped or matched filtered detection electrical signal Sb1. This can make the peak value and position of the subsequently determined reflection signal more accurate.

When the third detection sequence includes a constant envelope zero autocorrelation signal, regardless of whether the transmitted electrical signal Sb includes the third detection sequence or includes both the third detection sequence and the second service electrical signal (specifically, the byte containing the third detection sequence is different from the byte containing the second service electrical signal), the signal processor 472 is specifically used to correlate one of the detection electrical signal Sb1 and the second interference signal with one of the transmitted electrical signal Sb and the second hard-decision electrical signal to determine the peak value and position of the second correlation peak. The peak value and position of the second correlation peak are specifically represented by the OxDA waveform. The peak value and position of the second reflected signal are determined based on the peak value and position of the second correlation peak. The second hard-decision electrical signal is the electrical signal generated by hard-decision of the detection electrical signal Sb1. The difference between the detection electrical signal Sb1 and the second hard-decision electrical signal is the second interference electrical signal.

Specifically, when the signal processor 472 needs to use the transmitted electrical signal Sb, the signal processor 472 may have pre-stored the transmitted electrical signal Sb.

In other examples, when the transmitted electrical signal Sb includes a third detection sequence and a second service electrical signal, regardless of whether the byte containing the third detection sequence is different from the byte containing the second service electrical signal, or whether the third detection sequence is the tuning signal of the second service electrical signal, the signal processor 472 first determines the target electrical signal based on the detection electrical signal Sb1, and then determines the peak value and position of the second reflected signal.

Since the byte containing the third detection sequence is different from the byte containing the second service signal, the signal processor 472 is specifically used to determine the target signal based on the target byte of the detection signal Sb1. The target byte is the byte containing the third detection sequence. The signal processor 4b2 knows in advance the byte containing the third detection sequence in the transmitted signal Sb.

When the third detection sequence is the modulation signal of the second service electrical signal, the signal processor 472 is specifically used to demodulate the detection electrical signal Sb1 to determine the target electrical signal.

Specifically, when transmitting an electrical signal Sb, which includes a third detection sequence and a second service electrical signal, and the third detection sequence includes a linear frequency modulation signal or a step frequency signal, the signal processor 472 first determines the target electrical signal based on the detection electrical signal Sb1, determines the third frequency domain signal based on the target electrical signal, and determines the peak value and position of the second reflected signal based on the peak value and time delay of the third frequency domain signal.

When transmitting electrical signal Sb, which includes a third detection sequence and a second service electrical signal, and the third detection sequence includes a constant envelope zero autocorrelation signal, the signal processor 472 first determines the target electrical signal based on the detection electrical signal Sb1. It then correlates one of the target electrical signal and the third interference signal with one of the third detection sequence and the third hard-decision electrical signal to determine the peak value and position of the third correlation peak. Based on the peak value and position of the third correlation peak, it determines the peak value and position of the second reflection signal. The third hard-decision electrical signal is an electrical signal generated by hard-decision of the target electrical signal. The difference between the target electrical signal and the third hard-decision electrical signal is the third interference electrical signal.

For example, if a peak and position of the second reflected signal are known to be (A3, B3), it means that the cavity length of the reflecting cavity formed by the two reflecting points in the detection optical component 47 and the input optical fiber link 50 is B3, and the reflection intensity is A3. These two reflecting points can both be reflecting points in the input optical fiber link 50-1, or one of these two reflecting points is a reflecting point located in the detection optical component 47, and the other reflecting point is a reflecting point in the input optical fiber link 50-1.

Assuming both reflection points are reflection points within the input fiber optic link 50, the specific location of the reflection points in the input fiber optic link 50 can be determined based on the cavity length B3 of the reflection cavity formed by the two reflection points. However, referring to Figure 9, the input fiber optic link 50 is specifically input fiber optic link 50-1. If the distance between fiber optic connectors C1 and C2 is B3, and the distance between fiber optic connectors C3 and C4 is also B3, then the cavity length B3 cannot clearly determine whether the reflection cavity is formed between fiber optic connectors C1 and C2, or between fiber optic connectors C3 and C4. Therefore, manual inspection and adjustment of one or more of the fiber optic connectors C1, C2, C3, and C4 are required.

Referring to Figure 19, in order to more accurately locate the reflection point in the input optical fiber link 50, the embodiments of this application provide a reflection component 473 (also referred to as a second reflection component) in the detection optical component 47, such that one of the two reflection points is the reflection point formed by the reflection component 473 in the detection optical component 47, and the other reflection point is the reflection point in the input optical fiber link 50. Therefore, the cavity length of the reflection cavity formed between the two reflection points is the distance from the reflection point in the input optical fiber link 50 to the reflection component 473 in the detection optical component 47, thereby enabling accurate positioning of the reflection point in the input optical fiber link 50 based on the peak value and position of the reflected signal.

For example, as shown in FIG19, the detection optical component 47 further includes a reflection component 473, which is used to transmit a portion of the detection optical signal Ob1 to the photoelectric converter 471 and transmit another portion of the detection optical signal Ob1 to the input optical fiber link 50.

In one example, as shown in Figure 20, the reflective component 473 includes a polarizing beam splitter (PBS) 4731 and a reflective film 4732. The reflective film 4732 is disposed on a first surface of the polarizing beam splitter 4731, a second surface of the polarizing beam splitter 4731 is away from the photoelectric converter 471, and a third surface of the polarizing beam splitter 4731 faces the photoelectric converter 471. The reflectivity of the reflective film 4732 is greater than or equal to 1%.

For example, a lens 476 is typically provided in the detection light assembly 47. The lens 476 is used to focus the detection light signal Ob1 transmitted from the detection light port _d2 to the detection light assembly 47 and transmit it to the reflection assembly 473, and to focus a portion of the light signal from the reflection assembly 473 and transmit it to the detection light port _d2 .

In another example, referring to FIG21, the reflective assembly 473 includes a coupler 4734 and a looper 4733. The a-end of the looper 4733 (also referred to as the first end of the looper 4733) is connected to the detection optical port _d2 . The b-end of the looper 4733 (also referred to as the second end of the looper 4733) is connected to the d-end of the coupler 4734 (also referred to as the first end of the coupler 4734). The e-end of the coupler 4734 (also referred to as the second end of the coupler 4734) is connected to the photoelectric converter 471. The f-end of the coupler 4734 (also referred to as the third end of the coupler 4734) is connected to the c-end of the looper 4733 (also referred to as the third end of the looper 4733). Specifically, the optical signal input at terminal a of looper 4733 will be output through terminal b of looper 4733, the optical signal input at terminal b of looper 4733 will be output through terminal c of looper 4733, and the optical signal input at terminal c of looper 4733 will be output through terminal a of looper 4733; of the optical signal input at terminal d of coupler 4734, part of the optical signal will be output through terminal e of coupler 4734, and part of the optical signal will be output through terminal f of coupler 4734.

In another example, referring to FIG22, the detection optical component 47 further includes a demultiplexer 477. For example, when the optical signal received by the detection optical component 47 is a multi-wavelength optical signal generated by wavelength division multiplexing, the demultiplexer 477 can demultiplex the optical signals of different wavelengths and then transmit them to different photoelectric converters 471. At this time, the reflection component 473 includes a reflective film 4735, which is disposed on the side of the demultiplexer 477 away from the photoelectric converter 471. The reflectivity of the reflective film 4735 is greater than or equal to 1%.

In one example, the reflectivity of the reflective film 4735 can be 10%. For instance, to detect a reflection signal with a large peak value, the reflectivity of the reflective film 4735 can be set to 10%, which is approximately -10 dB. This ensures that the peak value of the reflection signal output from the reflection cavity formed by the reflection component 473 in the detection optical component 47 and the reflection point in the input optical fiber link 50 is large and easy to detect. In another example, the reflectivity of the reflective film 4735 can be 1%. For another example, the reflectivity of the reflective film 4735 can be 50%. Yet another example is that the reflectivity of the reflective film 4735 can be 99%. Specifically, the reflectivity of the reflective film 4735 can be determined based on the sensitivity of the detection optical component 47 and the margin of the optical signal transmitted in the input optical fiber link 50, ensuring that a portion of the optical signal in the detection optical signal Ob can be transmitted to the photoelectric converter 471.

For example, in the detection optical assembly 47 shown in any of Figures 19 to 22, the detection optical assembly 47 further includes a signal sampler 474 disposed between the photoelectric converter 471 and the signal processor 472; the signal sampler 474 is used to sample the detection electrical signal Sb1. For example, the signal sampler 474 can be an analog-to-digital converter (ADC), and the signal sampler 474 specifically downsamples the detection electrical signal Sb1, which can sample the detection electrical signal into a single detection electrical signal Sb1 or a multiple detection electrical signal Sb1.

For example, in the detection optical component 47 shown in any of Figures 19 to 22, the detection optical component 47 further includes a detection result determination device 475. The detection result determination device 475 is used to receive the peak value and position of the second reflected signal, and, in conjunction with the topology of the input optical fiber link 50, determine whether there is a fault in the input optical fiber link 50, and determine the positions of at least two reflection points. Since the detection result determination device 475 is located in the detection optical component 47, it can report the positions of the reflection points to the scanning control unit 46, or to the controller 70 of the optical switching network 200, or to the network management system, server, etc., of the optical switching network 200. The maintenance personnel of the optical switching network 200 can obtain the reflection point positions determined by the detection result determination device 475, and use these positions to repair the optical fiber connectors that form the reflection points.

When the detection optical component 47 does not include the detection result determination device 475, the function of the detection result determination device 475 can be integrated into the scanning control unit 46 in the optical cross-connect device 40, or into the controller 70 of the optical switching network 200 shown in FIG9.

Referring back to Figure 9, when the service optical receiving component 30 needs to transmit the peak value and position of the first reflected signal to the optical cross-connect device 40, the service optical receiving component 30 can first transmit the peak value and position of the first reflected signal to the service optical transmitting component 20 connected to the service optical receiving component 30. When the service optical transmitting component 20 outputs the service optical signal to the optical cross-connect device 40, it carries the peak value and position of the first reflected signal through a low-frequency signal and superimposes the low-frequency signal on the service optical signal (for example, setting the low-frequency signal as the tuning signal of the service optical signal). The optical cross-connect device 40 can then receive the low-frequency signal and thus receive the peak value and position of the first reflected signal.

Referring to Figure 9, the optical switching network 200 also includes a controller 70, which is connected to both the service optical receiving component 30 and the optical cross-connect device 40; the optical cross-connect device 40 is the optical cross-connect device 40 shown in any one of Figures 11 to 13. For example, the controller 70 is also connected to the service optical transmitting component 20.

For example, when the optical cross-connect device 40 is the optical cross-connect device 40 shown in FIG11, and the optical cross-connect device 40 needs to sequentially output and transmit optical signals Oa to each output optical fiber link 60, the controller 70 is used to output a first scan control signal to the optical cross-connect device 40. The first scan control signal is used to control the scan control unit 46 to couple each of the multiple service optical output ports to the detection optical port _d1 in a time-sharing manner. The first scan control signal is also used to control the scan control unit 46 to output a first control signal to the detection optical component 41 in a time-sharing manner.

When the optical cross-connect device 40 needs to receive the detection optical signal Ob1 transmitted from each input optical fiber link 50 to the detection optical component, the controller 70 is also used to output a third scan control signal to the optical cross-connect device 40 and output a first transmission control signal to the service optical transmission component 20. The first transmission control signal is used to control the multiple service optical transmission components 20 to output the transmission optical signal Ob in a time-sharing manner, and the third scan control signal is used to control the scan control unit 46 to couple each of the multiple service optical input ports to the detection optical port _d2 in a time-sharing manner. Specifically, there is a corresponding relationship between the service optical transmission component 20 and the service optical input port. The first transmission control signal controls the service optical transmission component 20-1 to output the transmission optical signal Ob, and the third scan control signal controls the service optical input port _i1 to couple with the detection optical port _d2 ; the first transmission control signal controls the service optical transmission component 20-2 to output the transmission optical signal Ob, and the third scan control signal controls the service optical input port _i2 to couple with the detection optical port _d2 ; the first transmission control signal controls the service optical transmission component 20-n to output the transmission optical signal Ob, and the third scan control signal controls the service optical input port _in to couple with the detection optical port _d2 .

For example, when the optical cross-connect device 40 is the optical cross-connect device 40 shown in FIG12, and the optical cross-connect device 40 needs to sequentially output and transmit optical signals Oa to each output optical fiber link 60, the controller 70 is used to output a first scan control signal to the optical cross-connect device 40. The first scan control signal is used to control the scan control unit 46 to couple each of the multiple service optical output ports to the detection optical port _d1 in a time-division manner. The first control signal is also used to control the scan control unit 46 to output a first control signal to the detection optical component 41 in a time-division manner.

When the optical cross-connect device 40 needs to receive the detection optical signal Ob1 transmitted from each input optical fiber link 50 to the detection optical component, the controller 70 is also used to output a second transmission control signal to the service optical transmission component 20. The second transmission control signal is used to control the multiple service optical transmission components 20 to output the transmission optical signal Ob in a time-division manner.

For example, when the optical cross-connect device 40 is the optical cross-connect device 40 shown in FIG13, and the optical cross-connect device 40 needs to sequentially output and transmit optical signals Oa to each output optical fiber link 60, the controller 70 is used to output a first scan control signal to the optical cross-connect device 40. The first scan control signal is used to control the scan control unit 46 to couple each of the multiple service optical output ports to the detection optical port _d1 in a time-sharing manner. The first control signal is also used to control the scan control unit 46 to output a first control signal to the detection optical component 41 in a time-sharing manner.

When the optical cross-connect device 40 needs to receive the detection optical signal Ob1 transmitted from each input optical fiber link 50 to the detection optical component, the controller 70 is also used to output a fourth scan control signal to the optical cross-connect device 40 and a third transmit control signal to the service optical transmit component 20. The third transmit control signal is used to control the multiple service optical transmit components 20 to output the transmit optical signal Ob in a time-sharing manner, and the fourth scan control signal is used to control the scan control unit 46 to couple each of the multiple service optical input ports to the service optical output port in a time-sharing manner. Specifically, there is a corresponding relationship between the service optical transmission component 20 and the service optical input port. Specifically, the third transmission control signal controls the service optical transmission component 20-1 to output the transmitted optical signal Ob, and the fourth scan control signal controls the coupling of the service optical input port _i1 and the service optical output port; the third transmission control signal controls the service optical transmission component 20-2 to output the transmitted optical signal Ob, and the fourth scan control signal controls the coupling of the service optical input port _i2 and the service optical output port; the third transmission control signal controls the service optical transmission component 20-n to output the transmitted optical signal Ob, and the fourth scan control signal controls the coupling of the service optical input port _in and the service optical output port.

For example, before the optical switching network 200 starts working, also known as before the service goes online, the controller 70 first outputs a first scan control signal, and then outputs a third scan control signal and a first transmit control signal, or a second transmit control signal, or a fourth scan control signal and a third transmit control signal.

In other embodiments, when the controller 70 determines that the bit error rate of the optical signal received by the service optical receiving component 30 is high, the controller 70 first outputs a first scan control signal, and then outputs a third scan control signal and a first transmission control signal, or a second transmission control signal, or a fourth scan control signal and a third transmission control signal, to determine which input optical fiber link 50 or output optical fiber link 60 has a reflection point.

When the controller 70 determines that the bit error rate of the optical signal received by the service optical receiving component 30 is high, it is aware of the faulty input optical fiber link 50 and the faulty output optical fiber link 60 connected to the service optical receiving component 30. The controller 70 can also output a detection control signal to the optical cross-connect device 40. The detection control signal controls the scanning control unit 46 to couple the service optical output port connected to the faulty output optical fiber link 60 with the detection optical port _d1 , and controls the detection optical component 41 to output a transmission optical signal Oa to the faulty output optical fiber link 60. The detection control signal also controls the scanning control unit 46 to couple the service optical input port connected to the faulty input optical fiber link 50 with the detection optical port _d2 , and outputs a transmission control signal to the service optical transmitting component 20 connected to the faulty input optical fiber link 50. The transmission control signal is used to control the service optical transmitting component 20 connected to the faulty input optical fiber link 50 to output a transmission optical signal Ob.

For example, when the controller 70 controls the detection optical component 41 to output the transmit optical signal Oa, the controller 70 controls the service optical transmission component 20 not to output the service optical signal, or controls the service optical transmission component 20 to output a service optical signal with a wavelength different from the transmit optical signal Oa.

Specifically, the optical switching network 200 shown in Figures 2 and 9 can be a data center network. The service optical signal output from any service optical transmitting component 20 can be transmitted to any service optical receiving component 30 through the input fiber optic link 50, the optical cross-connect device 40, and the output fiber optic link 60.

Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the scope of this application. Accordingly, this specification and drawings are merely exemplary illustrations of this application as defined by the appended claims, and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from the spirit and scope of this application. Thus, if such modifications and modifications of this application fall within the scope of the claims of this application and their equivalents, this application is also intended to include such modifications and modifications.

Claims (20)

An optical cross-connect device, characterized in that, The optical cross-connect device includes multiple service optical output ports, and one of the service optical output ports is connected to an output optical fiber link; The optical cross-connect device further includes: a scanning control unit, a first detection optical port, and a first detection optical component, wherein the first detection optical component is connected to the first detection optical port and the first detection optical component is connected to the scanning control unit; The scanning control unit is used to control the coupling between the first detection optical port and the service optical output port, and to output a first control signal to the first detection optical component; The first detection optical component is used to output a first transmit optical signal according to the first control signal. The first transmit optical signal is transmitted to the output optical fiber link through the coupled first detection optical port and the service optical output port. Wherein, the first transmitted optical signal is transmitted through the output optical fiber link to become the first detection optical signal. The first detection optical signal includes a first reflection signal. The first detection optical signal is used to determine the peak value and position of the first reflection signal. The first reflection signal is output based on at least one reflection point in the output optical fiber link. The optical cross-connect device according to claim 1 is characterized in that, The first detection optical component is further configured to receive the first detection optical signal and determine the peak value and position of the first reflected signal based on the first detection optical signal, wherein the first reflected signal is formed by the reflection point in the output optical fiber link reflecting the first transmitted optical signal. The optical cross-connect device according to claim 2 is characterized in that, The optical cross-connect device further includes multiple service optical input ports and a second detection optical port, one of the service optical input ports is connected to an input optical fiber link, and the first detection optical component is connected to the second detection optical port; The scanning control unit is also used to control the coupling of the second detection optical port with the service optical input port, and to output a second control signal to the first detection optical component; The first detection optical component is further configured to output a second transmit optical signal according to the second control signal. The second transmit optical signal is transmitted to the input optical fiber link through the coupled second detection optical port and the service optical input port. After being transmitted through the input optical fiber link, the second transmit optical signal becomes a second detection optical signal. The second detection optical signal includes a second reflection signal, which is formed by the reflection of the second transmit optical signal by a reflection point in the input optical fiber link. The first detection optical component is further configured to receive the second detection optical signal and determine the peak value and position of the second reflected signal based on the second detection optical signal. The optical cross-connect device according to claim 3 is characterized in that, The optical cross-connect device further includes an optical switch; the first detection optical component is connected to a first end of the optical switch, the first detection optical port is connected to a second end of the optical switch, the second detection optical port is connected to a third end of the optical switch, and the control end of the optical switch is connected to the scanning control unit; The scanning control unit is also used to output a first switch control signal to the optical switch; The optical switch is used to connect the first terminal of the optical switch to the second terminal of the optical switch according to the first switch control signal. The scanning control unit is also used to output a second switch control signal to the optical switch; The optical switch is used to connect the first terminal of the optical switch to the third terminal of the optical switch according to the second switch control signal. The optical cross-connect device according to claim 3 is characterized in that, The first detection optical component includes a first sub-detection optical component and a second sub-detection optical component, wherein the first sub-detection optical component is connected to the first detection optical port, and the second sub-detection optical component is connected to the second detection optical port; The first sub-detection optical component is used to output the first transmitted optical signal according to the first control signal; The second sub-detection optical component is used to output the second transmitted optical signal according to the second control signal. The optical cross-connect device according to any one of claims 3-5 is characterized in that, One of the plurality of service optical input ports serves as the first detection optical port, and one of the plurality of service optical output ports serves as the second detection optical port. The optical cross-connect device according to any one of claims 3-5 is characterized in that, The optical cross-connect device further includes a first monitoring optical transmission port and a second monitoring optical transmission port. The first monitoring optical transmission port is located on the same side as the plurality of service optical input ports, and the second monitoring optical transmission port is located on the same side as the plurality of service optical output ports. The first monitoring optical transmission port serves as the first detection optical port, and the second monitoring optical transmission port serves as the second detection optical port. The optical cross-connect device according to any one of claims 2-7 is characterized in that, The first detection optical component is further configured to determine the location and insertion loss value of the insertion loss point in the output optical fiber link based on the first detection optical signal. The optical cross-connect device according to claim 1 is characterized in that, The first detection optical signal is transmitted to the service optical receiving component, and the first reflected signal is output by a reflective cavity formed by at least two reflection points in the first detection optical component and the output optical fiber link. The optical cross-connect device according to claim 9 is characterized in that, The optical cross-connect device further includes multiple service optical input ports, a second detection optical port, and a second detection optical component. One of the service optical input ports is connected to an input optical fiber link, and the second detection optical component is connected to the second detection optical port. The second detection optical component is used to receive the second detection optical signal transmitted to the second detection optical component through the input optical fiber link via the coupled second detection optical port and the service optical input port, and to determine the peak value and position of the second reflection signal based on the second detection optical signal. The second detection optical signal includes the second reflection signal, which is output by a reflection cavity formed by at least two reflection points in the second detection optical component and the input optical fiber link. The optical cross-connect device according to claim 10 is characterized in that, One of the plurality of service optical input ports serves as the first detection optical port, and one of the plurality of service optical output ports serves as the second detection optical port; The scanning control unit is also used to control the coupling between the second detection optical port and the service optical input port. The optical cross-connect device according to any one of claims 6, 7, and 11 is characterized in that the optical cross-connect device further includes an optical cross-connect device and a first fiber array unit and a second fiber array unit disposed on both sides of the optical cross-connect device. The first fiber array unit includes the plurality of service optical input ports and the first detection optical port, and the second fiber array unit includes the plurality of service optical output ports and the second detection optical port. The optical cross-connect device according to claim 10 is characterized in that, The optical cross-connect device further includes a monitoring optical transmitting port and a monitoring optical receiving port, wherein the monitoring optical transmitting port serves as the first detection optical port and the monitoring optical receiving port serves as the second detection optical port. The optical cross-connect device according to claim 13 is characterized in that the optical cross-connect device further includes an optical cross-connect device and a first fiber array unit and a second fiber array unit disposed on both sides of the optical cross-connect device. The first fiber array unit includes the plurality of service optical input ports, the first detection optical port, and the second detection optical port; the second fiber array unit includes the plurality of service optical output ports; each of the plurality of service optical input ports is coupled to the second detection optical port through the optical cross-connect device. Alternatively, the first fiber array unit includes the plurality of service optical input ports and the first detection optical port, and the second fiber array unit includes the plurality of service optical output ports and the second detection optical port, wherein each of the plurality of service optical output ports is coupled to the second detection optical port through the optical cross-connect device. The optical cross-connect device according to claim 14 is characterized in that, When each of the plurality of service optical output ports is coupled to the second detection optical port through the optical cross-connect device, the scanning control unit is further configured to control the coupling between the service optical input port and the service optical output port. An optical switching network, characterized in that the optical switching network includes a plurality of service optical receiving components and an optical cross-connect device as described in any one of claims 1-15; One of the service optical receiving components is connected to one of the service optical output ports via one of the output optical fiber links. The optical switching network according to claim 16 is characterized in that the optical switching network further includes a controller, the controller being connected to the service optical receiving component and the optical cross-connect device respectively; The controller is configured to output a first scan control signal to the optical cross-connect device. The first scan control signal is configured to control the scan control unit to couple each of the plurality of service optical output ports to the first detection optical port in a time-division manner. The first scan control signal is also configured to control the scan control unit to output the first control signal to the first detection optical component in a time-division manner. An optical cross-connect device, characterized in that, The optical cross-connect device includes multiple service optical input ports, and one of the service optical input ports is connected to an input optical fiber link; The optical cross-connect device further includes: a second detection optical port and a second detection optical component, wherein the second detection optical component is connected to the second detection optical port; The second detection optical component is used to receive a second detection optical signal transmitted to the second detection optical component through the input optical fiber link via the coupled second detection optical port and the service optical input port, and to determine the peak value and position of the second reflection signal based on the second detection optical signal; wherein, the second detection optical signal includes the second reflection signal, and the second reflection signal is output based on at least one reflection point in the input optical fiber link. The optical cross-connect device according to claim 18 is characterized in that, The optical cross-connect device further includes a scanning control unit, which is connected to the second detection optical component; The scanning control unit is used to control the coupling of the second detection optical port with the service optical input port, and to output a second control signal to the second detection optical component; The second detection optical component is further configured to output a second transmit optical signal according to the second control signal. The second transmit optical signal is transmitted to the input optical fiber link through the coupled second detection optical port and the service terminal input port. After being transmitted through the input optical fiber link, the second transmit optical signal becomes the second detection optical signal. The second reflection signal is formed by the reflection of the second transmit optical signal by the reflection point in the input optical fiber link. The optical cross-connect device according to claim 18 is characterized in that, The second detection optical signal is formed by transmitting the second transmission optical signal output by the service optical transmission component to the second detection optical component through the input optical fiber link; The second reflected signal is output from a reflective cavity formed by at least two reflection points in the second detection optical component and the input optical fiber link.