CN101141221B - Configurable OADM device - Google Patents

Abstract

The configurable optical add-drop multiplexing device disclosed in the present invention includes: at least one optical preamplifier, used to receive and amplify input signals from corresponding directions; at least one coupler, used to divide the amplified input signal into multiple Drop signal; at least one drop wavelength selection receiving unit, used to receive multiple drop signals from the coupler, and select the drop signal of the corresponding wavelength from the multiple drop signals to output to the service equipment; at least one add wavelength The tunable transmitting unit is used to receive service access signals from service equipment, perform wavelength multiplexing on the service access signals, and divide the multiplexed service access signals into multiple uplink signals; at least one wavelength selection unit is used to Select a signal of a corresponding wavelength from multiple uplink signals output from the uplink wavelength tunable transmitting unit and multiple downlink signals output from the coupler; at least one optical power amplifier is used to amplify the corresponding wavelength signal from the wavelength selection unit.

Description

Configurable Optical Add-Drop Multiplexer

technical field

The present invention relates to the communication field, and more specifically relates to a configurable optical add-drop multiplexing device.

Background technique

At present, Dense Wavelength-Division Multiplexing (DWDM) equipment has been widely used in backbone networks to local and metropolitan core networks, and the network topology of DWDM equipment has also transitioned from simple point-to-point to ring network Intersect, which will eventually be applied to grids and meshes. The service type has transitioned from circuit switching services mainly based on Time Division Multiplexing (TDM) services to data services mainly based on IP. Due to the uncertainty of business development and the increase in the difficulty of early forecasting, there are requirements for intelligent equipment. It is hoped that when the network topology and business distribution change, the business scheduling function can be quickly and flexibly realized to adapt to networking and business Changes in distribution.

Similar to the implementation of VC-4 switching and scheduling by Synchronous Digital Hierarchy (SDH) equipment, the intelligence of the network requires DWDM equipment to provide wavelength-based configurable functions, that is, wavelength-configurable optical add-drop multiplexing ( Reconfigurable Optical Add/Drop Multiplexing, referred to as ROADM), and requires DWDM equipment to be remotely configured. ROADM can realize any point-to-any point connection without manual deployment, and can also realize single-wavelength add/drop and direct configuration. Using ROADM technology can increase the flexibility of the Wavelength Division Multiplexing (WDM) network, enabling operators to remotely and dynamically control the path of wavelength transmission, thereby effectively reducing the operator's operation and maintenance costs. At the same time, with the development of network scale and the diversity of business types, it is required to provide multi-directional intelligent ROADM system that can realize the function of business broadcasting.

There are many technologies for the realization of ROADM functions, including the traditional technology of Micro-Electro-Mechanical System (MEMS) based on optical switch arrays and the current technology based on new optical devices. The new optical devices mainly include wavelength blocking devices. (Wavelength Blocker, referred to as WB) and wavelength selective switch device (Wavelength Selective Switch, referred to as WSS).

In the background technology of "200610030504.3: Configurable Optical Add-Drop Multiplexing Device Realizing Single- and Multi-Directional Wavelength Scheduling", a functional block diagram of using an optical switch array to realize multi-directional ROADM functions is given, as shown in Figure 1, by using Demux /Switch/Mux technology realizes configurable upper and lower wavelengths. Assuming that the number of wavelengths in each direction is 40, ROADM nodes in 4 directions need 40 8×8 optical switches to realize the configurable up-down and multi-directional wavelength scheduling functions of the same wavelength, and two 160×160 optical switches are required to realize port Assignment function, such an optical switch scale is currently unrealizable. And because the optical switch cannot be smoothly expanded, the cost is high, and the reliability is not good, etc., the current optical switch solution cannot be commercialized.

In the background technology of "200610030504.3: Configurable Optical Add-Drop Multiplexing Device Realizing Single- and Multi-Directional Wavelength Scheduling", a block diagram of using an optical wavelength blocker to realize the ROADM function is given, as shown in Figure 2. The coupler and tunable filter use the broadcast selection method to realize wavelength selection and port assignment. The wavelength that needs to be added locally is blocked at the through port through the wavelength blocking device to realize the function of adding the wavelength. The structure is simple and flexible, and can realize the selective drop and broadcast function of unidirectional services, but this solution only realizes the unidirectional wavelength blocking function, and cannot realize the multi-directional wavelength scheduling function.

Due to the drawbacks of optical switch devices and wavelength blocking devices in implementing ROADM functions, WSS devices are generally used to implement ROADM functions at present. "200610030504.3: A Configurable Optical Add-Drop Multiplexer for Single- and Multi-Directional Wavelength Scheduling" provides a good way to use WSS devices to implement ROADM functions, as shown in Figure 3. Each direction uses a coupler to divide the input signal into several parts, and sends them to each uplink and local downlink respectively. The local uplink signal and the signals in each direction are output by the wavelength selection unit. The local downlink implementation of the method is as follows: the local downlink signals in each direction are selected by the wavelength selection unit, and distributed to the tunable filter unit for filtering, and then received by the receiving unit. The local on-line implementation of the method is as follows: the tunable transmitting unit is combined by the on-line multiplexing unit, and then distributed to each direction by the on-line distribution unit.

FIG. 4 is a detailed block diagram of realizing the multi-directional ROADM in FIG. 3 . It can be seen from Figure 4 that the device provided in "200610030504.3: Configurable Optical Add-Drop Multiplexing Device for Single- and Multi-Directional Wavelength Scheduling" can realize multi-directional wavelength add/drop configuration and scheduling functions, and support the broadcast function of wavelength bearer services , wavelength loopback function, wavelength routing protection function. However, since this method has one drop wavelength selection and distribution unit, optical signals of the same wavelength cannot be dropped in different directions; and this method has only one add multiplexing and distribution unit, and optical signals of the same wavelength cannot be added from the node. Due to this shortcoming, this method cannot be practical in actual networks.

Contents of the invention

In view of one or more problems described above, the present invention provides a new configurable optical add-drop multiplexing device.

The configurable optical add-drop multiplexing device according to the present invention includes: at least one optical preamplifier, used to receive and amplify input signals from corresponding directions; at least one coupler, used to divide the amplified input signal into multiple downstream Road signal; at least one drop wavelength selection receiving unit is used to receive multiple drop signals from the coupler, and select the drop signal of the corresponding wavelength from the multiple drop signals to output to the service equipment; at least one add wavelength can be The tuning and transmitting unit is used to receive service access signals from service equipment, perform wavelength multiplexing on the service access signals, and divide the multiplexed service access signals into multiple uplink signals; at least one wavelength selection unit is used for Select a signal of a corresponding wavelength from a plurality of uplink signals output by the uplink wavelength tunable transmitting unit and a plurality of downlink signals output by the coupler; and at least one optical power amplifier for amplifying the corresponding wavelength signal from the wavelength selection unit .

The configurable optical add/drop multiplexing device according to the present invention may also include: a common drop wavelength selection receiving unit, used to receive drop signals from multiple couplers, and select from the drop signals from multiple couplers The drop signal of the corresponding wavelength is output to the service equipment.

Wherein, the coupler divides the amplified input signal into multiple drop signals in the form of broadcasting. The uplink wavelength tunable transmitting unit divides the multiplexed service access signal into multiple uplink signals in the form of broadcast.

Wherein, the number of optical preamplifiers, couplers, drop wavelength selection units, wavelength selection units, and optical power amplifiers depends on the number of directions of pre-received input signals. The number of on-channel wavelength tunable transmitting units depends on the number of on-channel wavelengths of the device and the number of wavelengths that can be combined by the on-channel wavelength tunable transmitting units. The number of drop signals divided by the coupler depends on the number of directions of the pre-received input signal, the number of drop wavelengths in the corresponding direction, and the implementation of the drop wavelength receiving selection unit.

The present invention can provide flexible wavelength scheduling, wavelength configurable up/down function, broadcast function of wavelength bearer service, wavelength loopback function, and wavelength routing protection function, and at the same time realize that a node can add multiple optical signals of the same wavelength, and different directions can be The function of dropping optical signals of the same wavelength.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

Figure 1 is a block diagram of the optical switch array technology solution to realize the multi-directional ROADM node;

Fig. 2 is a block diagram of a unidirectional ROADM node realized by a wavelength blocking technical solution;

Fig. 3 is a block diagram of realizing the ROADM node by the technical solution of optical wavelength selection;

Fig. 4 is a detailed block diagram of a multi-directional ROADM node realized by an optical wavelength selection technical solution;

5 is a block diagram of a configurable optical add-drop multiplexing device according to an embodiment of the present invention;

Fig. 6 is a detailed block diagram of the device shown in Fig. 5;

Fig. 7 is a block diagram of a drop wavelength selection receiving unit in directions A to X;

Fig. 8 is a block diagram of a common drop wavelength selection receiving unit;

Fig. 9 is a block diagram of uplink wavelength tunable transmitting units 1-N;

Fig. 10 is a block diagram of a device for implementing ROADM functions in two directions;

Fig. 11 is a block diagram of A and B downlink wavelength selective receiving units of ROADMs in two optical directions;

Figure 12 is a cabinet diagram of the common drop wavelength selective receiving unit of ROADMs in two optical directions;

Fig. 13 is a cabinet diagram of the on-channel wavelength tunable transmitting units 1, 2, ..., 5 of ROADMs in two optical directions;

Fig. 14 is a block diagram of a device for realizing ROADM functions in four directions;

Fig. 15 is a realization cabinet diagram of the common drop wavelength selective receiving unit of ROADM in four directions; and

Fig. 16 is a cabinet diagram of the implementation of the on-channel wavelength tunable transmitting units 1-5 of the ROADM in four directions.

Detailed ways

The specific implementation manners of the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a block diagram of a multi-directional configurable optical add-drop multiplexing device realized by an optical switch array technical solution. The device is composed of a wavelength demultiplexer, a co-wave scheduling optical switch array, a wavelength multiplexer, a fixed laser array, an adjustable laser array, an uplink assigned optical switch, and a downlink assigned optical switch.

In Figure 1, the optical signals input from each line direction are separated by a wavelength demultiplexer, and the optical signals of each wavelength enter the co-wave scheduling optical switch array. The on-line signal from this node is connected through the adjustable laser array, the on-line port is assigned through the on-line assignment optical switch, and then the optical signal is changed through the fixed laser array, and output to the co-wave scheduling optical switch array. The same-wave dispatching optical switch array dispatches the wavelength signals input in each direction and the wavelength signals added on the local node to be output in a certain direction or dropped on the local node. The signal dispatched to a certain direction enters the wavelength multiplexer in the corresponding direction, and is combined with other wavelength signals for output. The wavelength signal dispatched to the downlink of this node enters the downlink assignment optical switch for downlink port assignment. The scale of the optical switch required by this scheme is relatively large, which is currently unrealizable. And because the optical switch cannot be smoothly extended, the cost is high, and the reliability is not good, etc., this solution cannot be commercialized at present.

Fig. 2 is a block diagram of a single-direction configurable optical add-drop multiplexing device realized by a wavelength blocking technical solution. The device consists of coupler-type wave splitter 1 to 2, wavelength blocking device, coupler-type wave splitter 2 in 1, coupler-type wave splitter 1 to 2 or 1 to 4 (for upgrade), coupler-type 1-to-8 or 1-to-16 (for drop), coupler-type multiplexer 2-in-1 or 4-in-1 (upgrade), coupler-type multiplexer 8-in-1 or 16-in-1 (for top lane) ), a tunable laser array, and a tunable filter array.

In Figure 2, the optical signal input through the line is divided into two parts by the coupler-type demultiplexer 1-2 device, one part is for WB, and the other part is for the coupler-type demultiplexer 1-2 or 1-4 (for upgrading). The optical signal input to the 1-2 or 1-4 (upgrade) device of the coupler-type wave splitter is divided into 2 parts or 4 parts by the 1-2 or 1-4 (upgrade) device of the coupler-type wave splitter, Part of the input to the coupler-type wave splitter is divided into 1 point 8 or 1 point 16, etc. (for the drop channel), and is divided into 8 or 16 parts by the coupler type wave splitter 1 point 8 or 1 point 16 (for the drop path) and so on. , Selective reception is performed by an adjustable filter array; other parts can be reserved for upgrades. The local add-on optical signal is received by the tunable laser array, and after wavelength tuning, it is output to coupler-type multiplexer 8-in-1 or 16-in-1 (for add-on) devices, and the coupler-type combiner 8-in-1 or 16-in-1 16 in 1 and other devices (for on-road use) are combined. After the combined signal and the signal of the port to be upgraded are combined by a coupler-type multiplexer 2 in 1 or 4 in 1 (for upgrade), they are combined with the WB resistor. The output optical signals after cutting certain wavelengths are combined and output by the coupler-type multiplexer 2-in-1 device. The structure of the device is simple and flexible, and can realize the selective drop and broadcast functions of unidirectional services, but the device only realizes the unidirectional wavelength blocking function, and cannot realize the multi-directional wavelength scheduling function.

Fig. 3 is a block diagram of a configurable optical add-drop multiplexing device realized by an optical wavelength selection technical solution. The device consists of an optical preamplifier, a coupler, a wavelength selection unit, an optical power amplifier, a drop wavelength selection and distribution unit, a tunable filtering and receiving unit, a tunable uplink transmitting unit, and an uplink multiplexing and distribution unit.

In Figure 3, the input optical signal of the line is amplified by the optical preamplifier, and then output to the coupler, which is divided into several parts in the form of broadcast by the coupler, which are respectively output to the drop wavelength selection and distribution unit, and the wavelength selection in each direction unit, or upgrade port, etc. The optical signals output from the couplers in each direction and enter the drop wavelength selection and distribution unit are selected for drop wavelength, and are distributed to multiple tunable filtering and receiving units for wavelength selective reception. The optical signal added by this node is tunable output by the tunable on-line transmitting unit, enters the on-line multiplexer and distribution unit, and after multiplexed optical signals of multiple wavelengths are distributed to the wavelength selection unit in each direction. The wavelength selection unit in each direction selects wavelengths from the output signals of the uplink multiplexing and distribution unit and the output signals of the couplers in each direction and outputs them to the optical power amplifier after multiplexing. The optical power amplifier performs power amplification for transmission. The device can realize multi-directional wavelength uplink and downlink configuration and scheduling functions, and supports the broadcast function of the wavelength bearer service, the wavelength loopback function, and the wavelength routing protection function. However, since the device has one drop wavelength selection and distribution unit, optical signals of the same wavelength cannot be dropped in different directions; and since the device has only one uplink multiplexer and distribution unit, optical signals of the same wavelength are not added from the node. . Due to this shortcoming, such devices are not practical in actual networks.

Fig. 4 is a detailed block diagram of a multi-directional configurable optical add-drop multiplexing device realized by an optical wavelength selection technical solution. Optical preamplifier from A to X, coupler from A to X, wavelength selection unit from A to X, optical power amplifier from A to X, drop wavelength selection and distribution unit, tunable filter and receiver Unit, tunable on-line transmitting unit, on-line multiplexer and distribution unit.

In Figure 4, the line input optical signals in each direction from A to X are amplified by the optical preamplifier in this direction, and output to the coupler, which is divided into several parts in the form of broadcast by the coupler, and output to the drop wavelength selection and Distribution unit, A-X wavelength selection unit. The optical signals output from the couplers in the A-X direction and enter the drop wavelength selection and distribution unit are selected for drop wavelength, and are distributed to multiple tunable filtering and receiving units for wavelength selective reception. The optical signal added by this node is tunable output by the tunable add channel, and then enters the add multiplexer and distribution unit, after multiplexed optical signals of multiple wavelengths, it is distributed to the wavelength selection unit in the A~X directions. The wavelength selection unit in each direction from A to X selects wavelengths from the output signals of the uplink multiplexing and distribution unit and the output signals of the couplers in the A to X directions and outputs them to the optical power amplifier after multiplexing for power amplification for transmission.

Fig. 5 is a block diagram of a configurable optical add-drop multiplexing device according to an embodiment of the present invention. As can be seen from Figure 5, the device consists of an optical preamplifier from A to X, a coupler from A to X, a drop wavelength selective receiving unit from A to X, a common drop wavelength selective receiving unit, and an add wavelength. The wavelength tunable transmitting unit is composed of 1-N, a wavelength selection unit from A to X, and an optical power amplifier from A to X.

In FIG. 5 , the optical preamplifiers in directions A to X respectively receive input signals in the corresponding directions and amplify the optical signals to ensure the through power and drop receive power in this direction. The optical signal amplified by the optical preamplifier in direction A ~ X is input to the coupler in this direction, and the coupler in this direction outputs it in the form of broadcast to the drop wavelength selective receiving unit and the common drop wavelength selective receiver in this direction. unit, and the wavelength selection unit from A to X to realize wavelength broadcast, loopback function, and route protection function.

In Figure 5, the drop wavelength selective receiving units in directions A to X respectively receive the drop signals output by the couplers in directions A to X, select wavelength signals from the drop signals in this direction for reception, and output them to the service equipment for reception. In order to realize the configurable downlink function, the optical signal of the same wavelength can be downlinked at A~X.

In Fig. 5, the common downlink wavelength selective receiving unit receives the downlink common signals output by the couplers in directions A to X, selects the wavelength signal from the downlink common signals from A to X to receive, and outputs the signals to the service equipment for reception. Realize configurable drop function and route protection function.

In Figure 5, the uplink wavelength tunable transmitting units 1 to N complete the wavelength tunability of service access signals. The wavelengths in this unit are multiplexed, and the combined optical signals are distributed to the A to X directions in the form of broadcast to realize The wavelength can be configured on the road, the on-road wavelength broadcast function, and the function that multiple same wavelengths can be on the road at the node. Wherein, N is an integer greater than or equal to 1, and the value of N is determined by the number of add wavelengths at the node and the number of wavelengths that can be combined by the add wavelength tunable transmitting unit.

In Fig. 5, the wavelength selection units in directions A to X select wavelengths from the signals output by each uplink wavelength tunable transmitting unit 1 to N and the signals output by the couplers in directions A to X respectively, and after multiplexing They are respectively output to the optical power amplifiers in directions A to X to realize flexible wavelength scheduling. The optical power amplifiers in directions A to X realize the amplification of optical signals in this direction to ensure transmission performance.

FIG. 6 is a detailed block diagram of the configurable optical add-drop multiplexing device shown in FIG. 5 . In this device, after the optical signal input in each direction is amplified by the optical preamplifier, the wavelength-insensitive coupler sends each wavelength signal in the form of broadcast to the down channel wavelength selection receiving unit and the common down channel in the direction. One channel wavelength selection receiving unit and wavelength selection units in each direction to realize wavelength broadcast function and wavelength loopback function.

In Fig. 6, the drop wavelength selection unit in each direction selects the wavelength to receive from the wavelength signals in the corresponding direction, and outputs it to the service equipment. Therefore, while realizing the configurable drop function, each direction can select the same wavelength for drop reception.

In Figure 6, the uplink part of the node is composed of 1~N wavelength tunable transmitting units, and each part completes the service access of the corresponding part, wavelength tunable output, wavelength multiplexing, and distribution in the A~X direction. Since the signals from parts 1 to N are respectively input to different ports of the wavelength selection unit in each direction, each part from 1 to N can add the same wavelength signal. Can be on the road at the node.

In FIG. 6 , the wavelength selection unit selects wavelengths from the signals output by the add wavelength tunable transmitting units 1 to N and the signals output by the coupler, and outputs them to the optical power amplifier after multiplexing, so as to realize the flexible wavelength scheduling function.

Fig. 7 is a realization block diagram of A~X downlink wavelength selective receiving units in Fig. 5 and Fig. 6 . The output signals of the drop ports 1-M of the coupler in Fig. 5 and Fig. 6 are selected by the tunable filter unit in Fig. 7 to output a single-wavelength signal and received by the receiver to realize the configurable drop function. In an actual configuration, the tunable filtering unit can be an optical tunable filter array, or a wavelength selective switch device.

FIG. 8 is a block diagram of an implementation of the common drop wavelength selective receiving unit in FIG. 5 and FIG. 6 . The output signals of the common drop ports of the couplers in the directions A to X in Fig. 5 and Fig. 6 are selected by the wavelength selection unit in Fig. 8 to select signals of different wavelengths in each direction, and then output after multiplexing. The tuning and filtering unit selects a single-wavelength signal output, which is received by the receiver, so as to realize the configurable drop function and route protection function. In an actual configuration, the wavelength selection unit may be a wavelength selection switch. The distribution unit can be a coupler, and an optical amplifier can be configured when the receiving power budget of the receiver is not enough. The tunable filter unit can be an optical tunable filter array, or a wavelength selective switch device.

FIG. 9 is a realization block diagram of the uplink wavelength tunable transmitting units 1-N in FIG. 5 and FIG. 6 . The tunable in Fig. 9 receives service signals, performs wavelength tuning, and outputs them to the multiplexing and distribution unit. The multiplexing and distributing unit will multiplex the tunable output signals, and distribute the multiplexed signals to directions A to X in the form of broadcast, and receive them from the wavelength selection unit in directions A to X in Fig. 5 and Fig. 6, so as to realize tunable Configure the add function and service broadcast function. In an actual configuration, the multiplexing and distributing unit in Fig. 9 may be a coupler.

Fig. 10 is a block diagram of a device for implementing ROADM functions in two directions. The two-direction ROADM device consists of an optical preamplifier, a 1x8 coupler, A-direction and B-direction downstream wavelength selective receiving units, a common downstream wavelength selective receiving unit, upstream wavelength tunable transmitting units 1-5, wavelength selective switches, and an optical power amplifier.

In Figure 10, the optical signals coming from directions A and B are respectively amplified by the optical preamplifiers in the corresponding directions, and then enter the 1x8 coupler. Public exit road, direction A, and direction B. Since the 1x8 coupler is a wavelength-insensitive device, it can broadcast optical signals to any drop port and any direction to realize wavelength broadcast and loopback functions.

In FIG. 10 , the optical signals of drop channels 1 to 5 of the 1x8 coupler are input to the drop wavelength selective receiving unit in the corresponding direction, so as to realize the configurable drop function.

In FIG. 10 , the common drop optical signals of the A-direction and B-direction 1x8 couplers are input to the common drop wavelength selection receiving unit to implement configurable drop and route protection functions.

In FIG. 10 , the uplink wavelength tunable transmitting units 1 to 5 respectively combine the access service signals of each unit and broadcast to the A-direction and B-direction wavelength selection units, so as to realize the configurable uplink function and service broadcasting function.

In Figure 10, the A-direction and B-direction wavelength selection units select the wavelength signals from the input signals of 1-5, A-direction and B-direction respectively, and then output them to the optical power amplifier for amplification, so as to realize the flexible wavelength scheduling function. The optical power amplifier amplifies the optical power to the appropriate optical power transmission.

FIG. 11 is a block diagram of an implementation of the A-direction and B-direction downstream wavelength selective receiving units in FIG. 10 . In Figure 11, the optical signals of channels 1 to 5 of the 1x8 coupler are input to the WSS, and the WSS selects any single-wavelength signal in this direction to be dropped and sent to the receiver for reception. In Figure 11, both direction A and direction B can drop any of the 40 waves to any port, so as to realize the configurable drop function. Since direction A and direction B have different drop wavelength selection receiving units, the same wavelength can be dropped.

Fig. 12 is an implementation block diagram of the common drop wavelength selective receiving unit in Fig. 10 . It can be seen from Figure 12 that the common drop signals of direction A and direction B are input to WSS1, WSS1 selects signals of different wavelengths for direction A and direction B, and outputs them to the optical amplifier after multiplexing. The optical amplifier completes the amplification of the optical signal, compensates for the loss of the device, and makes the receiver input have an appropriate optical power. The optical signal amplified by the optical amplifier is input to the 1x5 coupler to complete the power distribution. The power is divided into 5 parts and output to WSS2 respectively. WSS2 selects any single-wavelength signal in this direction to be dropped and sent to the receiver for reception. In Figure 12, WSS1 can select the wavelength signal from the optical signals in the A direction and the B direction, so it can use this to select a better reception of one signal to realize route protection. To realize this function, the sending end needs to send the signal to the A direction and the B direction. The uplink wavelength tunable transmitting units 1 to 5 in FIG. 10 all have this function. Figure 12 is similar to Figure 11, which can realize the configurable drop function.

Figure 11 and Figure 12 together enable the number of drop wavelengths in each direction to be greater than 40. In the actual configuration, you can choose the drop 1-5 ports of the 1x8 coupler in Figure 11 and the 1-5 ports of the 1x5 coupler in Figure 12 according to the specific situation, and configure the number of WSS and receivers to achieve different wavelengths Number of the next road.

FIG. 13 is a realization block diagram of the uplink wavelength tunable transmitting units 1-5 in FIG. 10 . Each tunable transmitting unit receives the service signal, tunes the wavelength, and outputs it to the 8x2 coupler. The 8x2 coupler completes the multiplexing and broadcasting of 8 wavelengths, and outputs the multiplexed signal to the wavelength selection unit in the A direction and the B direction to realize The adding function can be configured, and the routing protection function can be realized by cooperating with the public dropping wavelength selection receiving unit. Since the adding wavelength tunable transmitting unit includes 1 to 5 parts, different parts can add the same wavelength and output it to the wavelength selection unit in direction A and direction B, so multiple same wavelengths can be added on the node.

Fig. 14 is a block diagram of a device for realizing the ROADM function in four directions. The four-direction ROADM device consists of an optical preamplifier, a 1x10 coupler, a downlink wavelength selective receiving unit from A to D, a common downlink wavelength selective receiving unit, uplink wavelength tunable transmitting units 1 to 5, a wavelength selective switch, and an optical power amplifier.

In Figure 14, the optical signals coming from directions A, B, C and D are respectively amplified by the optical preamplifiers in the corresponding directions, and then enter the 1x10 coupler, and the 1x10 coupler sends the input signal in the form of broadcast Go to lower roads 1-5, public lower roads, direction A, direction B, direction C, and direction D. Since the 1x10 coupler is a wavelength-insensitive device, it can broadcast optical signals to any downstream port and any direction to realize wavelength broadcast and loopback functions.

In FIG. 14 , the optical signals of drop channels 1 to 5 of the 1x10 coupler are input to the drop wavelength selective receiving unit in the corresponding direction, so as to realize the configurable drop function.

In Fig. 14, the optical signals of the common drop of the 1x10 couplers in the A, B, C, and D directions are input to the common drop wavelength selection receiving unit to realize the configurable drop function and route protection function.

The uplink wavelength tunable transmitting units 1 to 5 in FIG. 14 respectively combine the access service signals of each unit and broadcast to the A-direction and B-direction wavelength selection units, so as to realize the configurable uplink function and service broadcasting function.

The wavelength selection units of directions A, B, C, and D in Fig. 14 respectively select the wavelength signals from the input signals of the upper channels 1 to 5, A, B, C, and D, and then output the multiplexed signals. Amplify the optical power amplifier to realize the wavelength flexible scheduling function. The optical power amplifier amplifies the optical power to the appropriate optical power transmission.

Fig. 11 is a realization block diagram of the A-direction, B-direction, C-direction, and D-downlink wavelength selective receiving unit in Fig. 14 . In Figure 11, the 1x10 coupler drops the optical signals of channels 1 to 5 into the WSS, and the WSS selects any single-wavelength signal in this direction to drop and send it to the receiver for reception. In Figure 11, directions A, B, C, and D can drop any of the 40 waves to any port to realize the configurable drop function. Since there are different drop wavelength selection receiving units for directions A, B, C, and D, the same wavelength can be dropped.

FIG. 15 is an implementation block diagram of the common drop wavelength selective receiving unit in FIG. 14 . It can be seen from Figure 15 that the common drop signals of directions A, B, C, and D are input to WSS1, and WSS1 selects signals with different wavelengths from directions A, B, C, and D for multiplexing. output to the optical amplifier. The optical amplifier completes the amplification of the optical signal, compensates for the loss of the device, and makes the receiver input have an appropriate optical power. The optical signal amplified by the optical amplifier is input to the 1x5 coupler to complete the power distribution. The power is divided into 5 parts and output to WSS2 respectively. WSS2 selects any single-wavelength signal in this direction to be dropped and sent to the receiver for reception. In Figure 15, WSS1 can select a wavelength signal from the optical signals in directions A, B, C, and D, so it can use this to select a better signal for receiving to realize route protection. To realize this function, the sending end needs to send the signal to the A direction, B direction, C direction, and D direction. The uplink wavelength tunable transmitting units 1 to 5 in Fig. 14 all have this function. Figure 15 is similar to Figure 11, realizing the configurable drop function.

Figure 11 and Figure 15 together enable the number of drop wavelengths in each direction to be greater than 40. In the actual configuration, you can choose the drop 1-5 ports of the 1x10 coupler in Figure 14 and the 1-5 ports of the 1x5 coupler in Figure 15 according to the specific situation, and configure the number of WSS and receivers to achieve different wavelengths Number of the next road.

FIG. 16 is a realization block diagram of the uplink wavelength tunable transmitting units 1-5 in FIG. 14 . Each tunable receiving unit receives the service signal, tunes the wavelength, and outputs it to the 8x2 coupler. The 8x2 coupler completes the multiplexing of 8 wavelengths, outputs 2 channels of multiplexing signals, and the two channels of multiplexing signals pass through two 1x2 couplers. Divide the combined signal into four parts and output to the wavelength selection units in A, B, C, and D directions to realize the configurable uplink function, and cooperate with the public downlink wavelength selection receiving unit to realize the route protection function. Since the adding wavelength tunable transmitting unit includes 1 to 5 parts, different parts can add the same wavelength and output to the wavelength selection unit in the A direction, B direction, C direction, and D direction, so multiple same wavelengths can be added on the node.

The above description is only an embodiment of the present invention, and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of the claims of the present invention.

Claims (4)

1. a configurable OADM apparatus is characterized in that, comprising:

A plurality of light preamplifiers are used to receive and amplify the input signal from respective direction;

A plurality of couplers are used for being divided into a plurality of roads signals down with the input signal that broadcast mode will pass through amplification;

A plurality of wavelength selective reception unit, road down are used to receive the said a plurality of road signals down from said a plurality of couplers of all directions, and under this direction, select the following road signal of respective wavelength to export business device to the signal of road;

A plurality of tunable wave length transmitter units of setting out on a journey; Be used to receive business access signal from said business device; Accomplish the tunable wave length of business access signal; Said business access signal is carried out wavelength close ripple, and the business access signal that will close behind the ripple is divided into a plurality of signals of setting out on a journey, be assigned to all directions with the form of broadcasting;

A plurality of wavelength selection unit are used for selecting from said a plurality of roads signals down of said a plurality of the set out on a journey signal and the outputs of said coupler of the said tunable wave length transmitter unit output of setting out on a journey the signal of respective wavelength; And

A plurality of power amplifiers are used to amplify the signal from the said respective wavelength of said wavelength selection unit;

Public wavelength selective reception unit, road down; Be used to dispose down road and route protection; Receive the different following road common signal of all directions that said coupler is divided with broadcast mode, and from said road common signal down, select the following road signal of respective wavelength to export said business device to.

2. configurable OADM apparatus according to claim 1; It is characterized in that said light preamplifier, said coupler, the said number of wavelength selective reception unit, road, said wavelength selection unit and said power amplifier down depend on the direction number of preparatory receiving inputted signal.

3. configurable OADM apparatus according to claim 2 is characterized in that, said number of setting out on a journey the tunable wave length transmitter unit depends on the number of wavelengths of setting out on a journey device number of wavelengths and the said tunable wave length transmitter unit of setting out on a journey can close ripple.

4. configurable OADM apparatus according to claim 3; It is characterized in that the said number of road signal down that is divided into by said coupler depends on the direction number of preparatory receiving inputted signal, the following road number of wavelengths and the said implementation of wavelength selective reception unit, road down of respective direction.

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