CN115967465A

CN115967465A - Wavelength division multiplexing equipment and optical signal processing method

Info

Publication number: CN115967465A
Application number: CN202111182587.9A
Authority: CN
Inventors: 李祥; 谭晶鑫; 顾江华
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-10-11
Filing date: 2021-10-11
Publication date: 2023-04-14
Also published as: WO2023061297A1

Abstract

The application discloses wavelength division multiplexing equipment and an optical signal processing method, which are used for reducing configuration cost. In the embodiment of the present application, by configuring the add circuit and the drop circuit of the OTU, for example, an optical path between an output end of the first combining unit and an input end of the second combining unit is used as the add circuit of the second OTU. And the optical path between the output end of the first wave splitting unit and the input end of the second wave splitting unit is used as a lower wave loop of the second OTU. And the optical paths between the output end of the second wave combining unit and the input end of the first wave combining unit are used as an upper wave loop of the first OTU. And the optical paths between the output end of the second wave splitting unit and the input end of the first wave splitting unit are used as a lower wave loop of the first OTU. When a fault occurs on the upper and lower wave main paths of the OTU, the transmission is carried out through the upper and lower wave loops, optical layer protection during the fault can be realized without configuring optical layer local dimensions, only the upper wave loop and the lower wave loop need to be established, and the configuration cost of wavelength division multiplexing equipment is reduced.

Description

Wavelength division multiplexing equipment and optical signal processing method

Technical Field

The embodiment of the application relates to the technical field of optical communication, in particular to wavelength division multiplexing equipment and an optical signal processing method.

Background

Wavelength Division Multiplexing (WDM) systems are used in the construction of communication networks of backbone networks and metropolitan area networks, and carry a large amount of important communication services. When a network fails, it is important to recover communication services quickly and in time.

Currently, the service protection methods adopted by the wavelength division multiplexing system are classified into electrical layer protection and optical layer protection. The electrical layer protection is mainly based on an optical data unit k (ODUk) sub-network connection protection (SNCP) protection mode, and needs to add configuration of an Optical Transport Unit (OTU) board, which is high in cost. At present, an optical layer protection mode generally adopts a rerouting protection mode based on a wavelength division multiplexing (WSON) network. The rerouting protection mode of WSON generally performs directional up-down wave optical layer configuration of local dimension in a reconfigurable optical add-drop multiplexer (ROADM). The local dimension is generally realized by adopting a wavelength selective switch or a dual-mode wavelength selective switch, a wavelength multiplexing/demultiplexing single board, an optical amplifier and the like, so that the configuration cost is high.

Disclosure of Invention

The embodiment of the application provides wavelength division multiplexing equipment and an optical signal processing method, which are used for reducing the equipment configuration cost of optical layer protection.

In a first aspect, an embodiment of the present application provides a wavelength division multiplexing device. The wavelength division multiplexing equipment comprises a first wave division unit, a first wave combination unit, a second wave division unit and a second wave combination unit. The input end of the first wave-splitting unit is respectively optically connected with the first adjacent wave-division multiplexing equipment and the output end of the second wave-splitting unit, and the output end of the first wave-splitting unit is respectively optically connected with the input end of the first wave-combining unit and the input end of the second wave-splitting unit. The output end of the first wavelength division unit is also in direct optical connection with at least one first optical transmission unit OTU. The input end of the first wave combining unit is also optically connected with the output end of the second wave combining unit, and the input end of the first wave combining unit is also optically connected with at least one second OTU directly. The output end of the first wave combining unit is optically connected with the second adjacent wavelength division multiplexing equipment and the input end of the second wave combining unit. The input end of the second wave division unit is also optically connected with the second adjacent wave division multiplexing equipment, the output end of the second wave division unit is also optically connected with the input end of the second wave combination unit, and the output end of the second wave division unit is also directly optically connected with at least one second OTU. The input end of the second multiplexing unit is also in direct optical connection with at least one first OTU. The output end of the second wave-combining unit is also optically connected with the first adjacent wavelength division multiplexing equipment.

The first wavelength division unit is configured to separate a second optical signal and a third optical signal from the received first optical signal, and then send the second optical signal to the first OTU. When the wavelength division multiplexing equipment and the second adjacent wavelength division multiplexing equipment are connected normally, the first wavelength division unit sends the third optical signal to the first wavelength combination unit; when the wavelength division multiplexing equipment is in failure connection with second adjacent wavelength division multiplexing equipment, the first wavelength division unit sends the third optical signal to the second wavelength division unit. The first wavelength multiplexing unit is used for sending the received fourth optical signal to the second adjacent wavelength division multiplexing equipment when the wavelength division multiplexing equipment and the second adjacent wavelength division multiplexing equipment are connected normally, and sending the fourth optical signal to the second wavelength multiplexing unit when the wavelength division multiplexing equipment and the second adjacent wavelength division multiplexing equipment are connected in a fault; the fourth optical signal includes at least an optical signal from at least one second OTU. And the second wavelength division unit is configured to separate a sixth optical signal and a seventh optical signal from the received fifth optical signal, and send the second sixth optical signal to the second OTU. When the wavelength division multiplexing equipment and the first adjacent wavelength division multiplexing equipment are connected normally, the second wavelength division unit sends the seventh optical signal to the second multiplexing unit, and when the wavelength division multiplexing equipment and the first adjacent wavelength division multiplexing equipment are connected in a fault, the second wavelength division unit sends the seventh optical signal to the first wavelength division unit. The second wavelength multiplexing unit is used for sending the received eighth optical signal to the second adjacent wavelength division multiplexing equipment when the wavelength division multiplexing equipment is normally connected with the first adjacent wavelength division multiplexing equipment, and sending the eighth optical signal to the first wavelength multiplexing unit when the wavelength division multiplexing equipment is failed to be connected with the first adjacent wavelength division multiplexing equipment; the eighth optical signal includes at least an optical signal from the at least one first OTU.

Through the scheme provided by the embodiment of the application, the first wave splitting unit and the second wave splitting unit are in optical connection, and the first wave combining unit and the second wave combining unit are also in optical connection to form an upper wave loop and a lower wave loop of the first OTU and the second OTU. The optical path between the output end of the first multiplexing unit and the input end of the second multiplexing unit can be understood as an upper wave loop of the second OTU. The optical path between the output end of the first wave-splitting unit and the input end of the second wave-splitting unit can be understood as a lower wave loop of the second OTU. The optical path between the output end of the second multiplexing unit and the input end of the first multiplexing unit can be understood as an upper wave loop of the first OTU. The optical path between the output end of the second wave-splitting unit and the input end of the first wave-splitting unit can be understood as a lower wave loop of the first OTU. Therefore, the transmission is carried out through the upper and lower wave loops when the fault occurs on the upper and lower wave main paths of the OTU. The optical layer protection during the fault can be realized without configuring the optical layer local dimension, only an upper wave loop and a lower wave loop need to be established, and devices such as a WSS (wavelength division multiplexing) device with the local dimension do not need to be additionally added, so that the resources can be reduced, and the configuration cost of the wavelength division multiplexing equipment can be reduced.

In one possible design, the first demultiplexing unit includes N +2 output ports including a first input port, a second input port, a first output port and a second output port, the second demultiplexing unit includes N +2 output ports including a third input port, a fourth input port, a third output port and a fourth output port, the first multiplexing unit includes N +2 input ports including a fifth output port, a sixth output port, a fifth input port and a sixth input port, the second multiplexing unit includes N +2 input ports including a seventh output port, an eighth output port, a seventh input port and an eighth input port, and N is a positive integer; the first input port is optically connected with the first adjacent wavelength division multiplexing equipment, the second input port is optically connected with the third output port of the second wavelength division unit, and the first output port is optically connected with the fifth input port; the second output port is optically connected to the third input port; n1 output ports except the first output port and the second output port in the first wavelength division unit are directly optically connected with N1 first OTUs in a one-to-one correspondence mode, wherein N1 is smaller than or equal to N; the sixth input port is optically connected with the seventh output port, the N2 input ports in the first wave combining unit except the fifth input port and the sixth input port are directly and optically connected with the N2 second OTUs in one-to-one correspondence, the fifth output port is optically connected with the second adjacent wavelength division multiplexing equipment, and the sixth output port is optically connected with the seventh input port; the fourth input port is optically connected with the second adjacent wavelength division multiplexing equipment, and the fourth output port is optically connected with the eighth input port; the N2 output ports of the second wave-splitting unit except the third output port and the fourth output port are directly optically connected with the N2 second OTUs in a one-to-one correspondence mode, and N2 is smaller than or equal to N; the eighth output port is optically connected with the first adjacent wavelength division multiplexing equipment, and the input ports of the N1 in the second wave combining unit except the seventh input port and the eighth input port are directly optically connected with the N1 first OTUs in a one-to-one correspondence manner. The upper and lower wave loops are realized through the configuration connection among the ports, and the upper and lower wave transmission of connecting a plurality of OTUs is supported, so that the utilization rate of the wavelength division multiplexing equipment is improved, and the configuration cost of the wavelength division multiplexing equipment is further reduced.

In one possible design, the first wavelength division unit includes a first coupler and a first wavelength selective switch WSS, the second wavelength division unit includes a second coupler and a second WSS, the first multiplexing unit includes a first optical splitter and a third WSS, and the second multiplexing unit includes a second optical splitter and a fourth WSS; the input end of the first coupler is respectively optically connected with the first adjacent wavelength division multiplexing equipment and the output end of the second WSS, the output end of the first coupler is optically connected with the input end of the first WSS, the output end of the first WSS is respectively optically connected with the input end of the third WSS and the input end of the second coupler, and the output end of the first WSS is also directly optically connected with at least one first OTU; the input end of the third WSS is further optically connected with the output end of the second optical splitter, the input end of the third WSS is further optically connected with at least one second OTU directly, the output end of the third WSS is optically connected with the input end of the first optical splitter, and the output end of the first optical splitter is respectively optically connected with the second adjacent wavelength division multiplexing equipment and the fourth WSS; the input end of the second coupler is also optically connected with the second adjacent wavelength division multiplexing equipment, the output end of the second coupler is optically connected with the input end of the second WSS, the output end of the second WSS is also optically connected with the fourth WSS, and the output end of the second WSS is also directly optically connected with at least one second OTU; the input end of the fourth WSS is further optically connected directly to the at least one first OTU, the output end of the fourth WSS is optically connected to the input end of the second optical splitter, and the output end of the second optical splitter is further optically connected to the first adjacent wavelength division multiplexing device. Through the design, the function of the wavelength division multiplexing unit is realized by combining the coupler and the WSS, the function of the wavelength combination unit is realized by combining the WSS and the optical splitter, and the configuration cost of the wavelength division multiplexing equipment can be further reduced due to the fact that the added coupler and the added optical splitter are low in cost.

In one possible design, the first WSS and the fourth WSS are deployed on the same single board; the second WSS and the third WSS are deployed on the same single board.

In a possible design, the first wavelength division unit further includes a first optical amplifier, which is disposed between the first coupler and the first wavelength selective switch WSS; the second wave-splitting unit also comprises a second optical amplifier which is arranged between the first coupler and the second WSS; the first wave-combining unit also comprises a third optical amplifier, and the third optical amplifier is arranged between the first optical splitter and the third WSS; the second multiplexing unit further comprises a fourth optical amplifier, and the fourth optical amplifier is arranged between the second optical splitter and the fourth WSS. The above design improves the transmission power of the optical signal by the optical amplifier.

In one possible design, the first wave-splitting unit and the second wave-splitting unit are respectively a WSS; the first wave combining unit and the second wave combining unit are respectively WSS. In the design, the functions of the wavelength division unit and the wavelength combination unit are realized only by the WSS, and the configuration of a local optical layer is not required to be additionally increased, so that the configuration cost of the wavelength division multiplexing equipment is reduced.

In a possible design, the WSSs included in the first wave splitting unit and the second wave combining unit are deployed on the same single board, and the WSSs included in the second wave splitting unit and the first wave combining unit are deployed on the same single board.

In a possible design, the first demultiplexing unit and the second multiplexing unit are disposed on the same board, and the second demultiplexing unit and the first multiplexing unit are disposed on the same board.

In one possible design, the first wavelength division unit includes a first optical switch and a first WSS, the second wavelength division unit includes a second optical switch and a second WSS, the first wavelength combination unit includes a third optical switch and a third WSS, and the second wavelength combination unit includes a fourth optical switch and a fourth WSS; the input end of the first optical switch is respectively optically connected with the first adjacent wavelength division multiplexing equipment and the output end of the second WSS, the output end of the first optical switch is optically connected with the input end of the first WSS, the output end of the first WSS is respectively optically connected with the input end of the third WSS and the input end of the second optical switch, and the output end of the first WSS is also directly optically connected with at least one first OTU; the input end of the third WSS is also optically connected with the output end of the fourth optical switch, the input end of the third WSS is also directly optically connected with at least one second OTU, the output end of the third WSS is optically connected with the input end of the third optical switch, and the output end of the first optical splitter is respectively optically connected with the second adjacent wavelength division multiplexing equipment and the fourth WSS; the input end of the second optical switch is also optically connected with the second adjacent wavelength division multiplexing equipment, the output end of the second optical switch is optically connected with the input end of the second WSS, the output end of the second WSS is also optically connected with the fourth WSS, and the output end of the second WSS is also directly optically connected with at least one second OTU; the input end of the fourth WSS is further optically connected to at least one first OTU directly, the output end of the fourth WSS is optically connected to the input end of the fourth optical switch, and the output end of the fourth optical switch is further optically connected to the first adjacent wavelength division multiplexing device. Through the design, the functions of the wavelength division unit and the wavelength combination unit are realized by combining the optical switch and the WSS, and the configuration cost of the wavelength division multiplexing equipment is further reduced due to the fact that the added optical switch is low in cost.

In one possible design, the first wavelength division unit further includes a first optical amplifier disposed between the first optical switch and the first wavelength selective switch WSS; the second wave splitting unit also comprises a second optical amplifier which is arranged between the second optical switch and the second WSS; the first wave-combining unit also comprises a third optical amplifier, and the third optical amplifier is arranged between the third optical switch and the third WSS; the second multiplexing unit further comprises a fourth optical amplifier, and the fourth optical amplifier is arranged between the fourth optical switch and the fourth WSS.

In one possible design, the wavelength division multiplexing device further includes a first optical amplifier, a second optical amplifier, a third optical amplifier, and a fourth optical amplifier; the first optical amplifier is arranged at the input end of the first wavelength division unit, and the first wavelength division unit is optically connected with the first adjacent wavelength division multiplexing equipment through the first optical amplifier; the second optical amplifier is arranged at the input end of the second wavelength division unit, and the second wavelength division unit is optically connected with the second adjacent wavelength division multiplexing equipment through the second optical amplifier; the third optical amplifier is arranged at the output end of the first wave combining unit, and the first wave combining unit is optically connected with the second adjacent wavelength division multiplexing equipment through the third optical amplifier; the fourth optical amplifier is disposed at an output end of the second multiplexing unit, and the second multiplexing unit is optically connected to the first adjacent wavelength division multiplexing device through the fourth optical amplifier.

In one possible design, the first optical amplifier, the first wavelength division unit, the second wavelength combination unit, and the fourth optical amplifier are disposed on the same single board. The second optical amplifier, the second wave splitting unit, the first wave combining unit and the third optical amplifier are arranged on the same single board.

In one possible design, the wavelength division multiplexing device further includes a controller configured to control the first wavelength division unit to cross the third optical signal light to the second wavelength division unit when the wavelength division multiplexing device is failed to connect with a second adjacent wavelength division multiplexing device; and controlling the first multiplexing unit to cross the fourth optical signal light to the second multiplexing unit. Optionally, the controller is further configured to control the first wavelength division multiplexing unit to cross the third optical signal to the first multiplexing unit when the wavelength division multiplexing device and the second adjacent wavelength division multiplexing device are connected normally; and controlling the first multiplexing unit to optically cross the fourth optical signal to the second adjacent wavelength division multiplexing device.

In one possible design, the wavelength division multiplexing device further includes a controller configured to control the second wavelength division unit to cross the seventh optical signal light to the first wavelength division unit when the wavelength division multiplexing device is failed to connect with the first adjacent wavelength division multiplexing device; and controlling the second multiplexing unit to cross the eighth optical signal light to the first multiplexing unit. Optionally, the controller is further configured to control the second wavelength division multiplexing unit to cross the seventh optical signal to the second multiplexing unit when the wavelength division multiplexing device and the first adjacent wavelength division multiplexing device are connected normally; and controlling the second multiplexing unit to optically cross the eighth optical signal to the first adjacent wavelength division multiplexing device.

In a second aspect, an embodiment of the present application provides an optical signal processing method. The wavelength division multiplexing equipment comprises a first wave division unit, a first wave combination unit, a second wave division unit and a second wave combination unit. The method comprises the following steps: a first optical signal is received from a first adjacent wavelength division multiplexing device. And separating a second optical signal to be sent to at least one OTU from the first optical signal through the first wavelength division unit, and directly distributing the second optical signal to at least one first OTU. When the wavelength division multiplexing equipment is normally connected with second adjacent wavelength division multiplexing equipment, the first wavelength division unit is controlled to send third optical signals except the second optical signals in the first optical signals to the first wavelength combination unit, and the third optical signals are sent to the second adjacent wavelength division multiplexing equipment through the first wavelength combination unit. And when the wavelength division multiplexing equipment is in failure connection with second adjacent wavelength division multiplexing equipment, controlling the first wavelength division unit to send a third optical signal except the second optical signal in the first optical signal to the second wavelength division unit. And controlling the second wavelength division unit to separate a fourth optical signal to be sent to at least one second OTU from the third optical signal, and sending the fourth optical signal to the at least one second OTU through the second wavelength division unit. And controlling the second wavelength division unit to send a fifth optical signal except the fourth optical signal in the third optical signal to the second multiplexing unit, and sending the fifth optical signal to the first adjacent wavelength division multiplexing equipment through the second multiplexing unit.

In one possible design, the method further includes: receiving an optical signal from at least one second OTU; and when the wavelength division multiplexing equipment and the second adjacent wavelength division multiplexing equipment are in connection failure, controlling the first multiplexing unit to send the optical signal from at least one second OTU to the second multiplexing unit. Transmitting the fifth optical signal to the first adjacent wavelength division multiplexing device through the second multiplexing unit, including: and the fifth optical signal and the optical signal from at least one second OTU are subjected to wave combination processing through a second wave combination unit and then are sent to the first adjacent wavelength division multiplexing equipment.

In one possible design, the method further includes: an optical signal from at least one first OTU is received. The fifth optical signal and the optical signal from at least one second OTU are combined by the second combining unit, and then sent to the first adjacent wavelength division multiplexing device, which specifically includes: and the fifth optical signal, the optical signal from the at least one first OTU and the optical signal from the at least one second OTU are subjected to wave combination processing by a second wave combination unit and then are sent to the first adjacent wavelength division multiplexing equipment.

In a possible design, controlling the first wavelength division unit to send a third optical signal, except the second optical signal, of the first optical signal to the second wavelength division unit specifically includes: and controlling the first wave-splitting unit to perform optical cross switching to optically cross a third optical signal except the second optical signal in the first optical signal to an output port connected with the second wave-splitting unit.

The structures of the first wave splitting unit, the second wave splitting unit, the first combining unit and the second combining unit may refer to the related description of the first aspect, and are not described herein again.

In a third aspect, an embodiment of the present application further provides an optical signal processing method. The method can be applied to a controller in a wavelength division multiplexing device. The wavelength division multiplexing equipment comprises a first wave division unit, a first wave combination unit, a second wave division unit and a second wave combination unit. The method comprises the following steps: and controlling the first wavelength division unit to separate a second optical signal to be sent to at least one OTU from the received first optical signal, and directly distributing the second optical signal to at least one first OTU. When the wavelength division multiplexing equipment is normally connected with second adjacent wavelength division multiplexing equipment, the first wavelength division unit is controlled to send third optical signals except the second optical signals in the first optical signals to the first wavelength combination unit, and the first wavelength combination unit is controlled to send the third optical signals to the second adjacent wavelength division multiplexing equipment. And when the wavelength division multiplexing equipment is in failure connection with second adjacent wavelength division multiplexing equipment, controlling the first wavelength division unit to send a third optical signal except the second optical signal in the first optical signal to the second wavelength division unit. And controlling the second wave splitting unit to separate a fourth optical signal to be sent to at least one second OTU from the third optical signal, and controlling the second wave splitting unit to send the fourth optical signal to at least one second OTU. And controlling the second wavelength division unit to send a fifth optical signal in the third optical signal except the fourth optical signal to the second multiplexing unit, and controlling the second multiplexing unit to send the fifth optical signal to the first adjacent wavelength division multiplexing equipment.

In one possible design, the method further includes: and when the wavelength division multiplexing equipment and the second adjacent wavelength division multiplexing equipment are in connection failure, controlling the first multiplexing unit to send the optical signal from at least one second OTU to the second multiplexing unit. Controlling the second multiplexing unit to transmit the fifth optical signal to the first adjacent wavelength division multiplexing device includes: and controlling the second wave-combining unit to combine the fifth optical signal and the optical signal from at least one second OTU, and then sending the combined optical signal to the first adjacent wavelength division multiplexing equipment.

In one possible design, the method further includes: controlling a second multiplexing unit to multiplex the fifth optical signal and the optical signal from at least one second OTU, and then sending the multiplexed optical signal to a first adjacent wavelength division multiplexing device, specifically including: and controlling the second wave-combining unit to combine the fifth optical signal, the optical signal from the at least one first OTU and the optical signal from the at least one second OTU, and then sending the combined optical signal to the first adjacent wavelength division multiplexing equipment.

In a fourth aspect, embodiments of the present application provide a computer-readable storage medium. The storage medium has stored therein a software program which, when read and executed by one or more processors, is operable to carry out the method provided by any one of the designs of the third aspect.

In a fifth aspect, embodiments of the present application provide a computer program product comprising instructions. When run on a computer, cause the computer to perform the method provided by any of the designs of the third aspect described above.

The beneficial effects of the second aspect to the fifth aspect can be referred to in the description related to the first aspect, and are not described herein again.

Drawings

FIG. 1 is a schematic diagram of a non-directional ROADM architecture;

FIG. 2 is a schematic diagram of a ring metropolitan area network;

fig. 3A is a schematic structural diagram of a wavelength division multiplexing device in an embodiment of the present application;

FIG. 3B is a schematic view of another wavelength division multiplexing device in an embodiment of the present application;

FIG. 4 is a schematic view of a wavelength division multiplexing device according to an embodiment of the present application;

fig. 5 is a schematic diagram of a signal processing manner of the wavelength division multiplexing device when the a-direction link and the B-direction link are normal in the embodiment of the present application;

fig. 6 is a schematic diagram of a signal processing method of the wdm apparatus when the B-directional link fails in the embodiment of the present application;

fig. 7 is a schematic diagram of a signal processing manner of the wdm apparatus when the a-directional link fails in the embodiment of the present application;

fig. 8 is a schematic structural diagram of a wavelength division multiplexing device according to another embodiment of the present application;

fig. 9 is a schematic structural diagram of a wavelength division multiplexing device provided in example 1 of the present application;

fig. 10 is a schematic structural view of another wavelength division multiplexing device provided in example 1 of the present application;

fig. 11 is a schematic structural diagram of another wavelength division multiplexing device provided in example 1 of the present application;

fig. 12 is a schematic diagram illustrating a connection relationship between ports in a wavelength division multiplexing device according to example 1 of the present application;

fig. 13 is a schematic structural view of a wavelength division multiplexing device provided in example 2 of the present application;

fig. 14 is a schematic view of a wavelength division multiplexing device according to another embodiment of the present application, as provided in example 2;

fig. 15 is a schematic structural view of a wavelength division multiplexing device according to example 3 of the present application;

fig. 16 is a schematic structural view of another wavelength division multiplexing device provided in example 3 of the present application;

fig. 17 is a schematic view of a structure of another wavelength division multiplexing device provided in example 3 of the present application;

fig. 18 is a schematic diagram illustrating a connection relationship between ports in a wavelength division multiplexing device according to example 3 of the present application;

fig. 19 is a flowchart illustrating an optical signal processing method according to an embodiment of the present application.

Detailed Description

The present application will be described in further detail below with reference to the accompanying drawings.

The wavelength division multiplexing system can adopt an optical layer service protection mode. The optical layer protection mode can adopt a rerouting protection mode of WSON. The rerouting protection mode of the WSON may adopt a mode of deploying a non-directional ROADM. FIG. 1 is a schematic diagram of a non-directional ROADM architecture. As shown in fig. 1, the non-directional ROADM includes 2 1 × n WSS boards, which are a WSS board 1 and a WSS board 2, respectively, and is used to implement wavelength scheduling between different dimensions. At least one 1 × n WSS board 3 and an ADD/Drop multiplexer (ADM), which may be an ADD/Drop multiplexer (ADD/Drop multiplexer), are also required in the optical layer local dimension for connecting Optical Transport Unit (OTU) boards. In the following description, the OTU single board is simply referred to as OTU. The add/drop multiplexer may be a wavelength-independent (chromatic) add/drop unit constructed based on WSS, or a wavelength-dependent (chromatic) add/drop unit constructed based on Arrayed Waveguide Grating (AWG). The ROADM site mainly carries out local up-down wave division according to the wavelength through a WSS single board and an up-down wave division unit of optical layer local dimension, and realizes the dispatching of the line direction. And the 1 × n WSS single plate 3 in the optical layer local dimension is used for connecting WSS single plates in different direction dimensions. The WSS board may be composed of two 1 × n WSS modules, or may be composed of one 1 × n WSS module and one 1 × n optical Splitter (Splitter).

The signal flow is described below by taking the up-down wavelength division of λ 1 wavelength in the direction 1 of fig. 1 as an example. In the down-wave direction, an optical signal with a wavelength λ 1 enters an optical receiving module (for example, 1 × n WSS module or Splitter module) of the WSS single plate 1 through the optical cable in the direction 1, and is subjected to wavelength selection through the optical receiving module, and is sent to an optical receiving module (WSS module) wave combining port (for example, AM port) of the optical layer local dimension WSS single plate 3 through a wave splitting port (for example, DM port) of the WSS single plate 1 in the direction 1, and then to a down-wave splitting unit, and then reaches a receiving end of the OTU 2. In the add direction, an optical signal with a wavelength λ 1 sent by the OTU2 is added by an add wavelength combining unit (WSS single board or AWG single board) of the optical layer local dimension, enters an add unit (such as a WSS module or a Splitter module) of the optical layer local dimension WSS single board 3, goes from a wavelength division port (DM port) of the optical layer local dimension WSS single board 3 to a wavelength selection unit (WSS module) of the direction 1 dimension WSS single board 1, and is input to the direction 1 dimension optical cable after the wavelength of the WSS module is crossed.

The directive less ROADM site needs to configure the configuration of the up-and-down wave optical layer of the local dimension. The optical layer local dimension is realized by adopting a WSS single board, an upper and lower wavelength division single board and the like, so that the configuration cost is higher.

The embodiment of the application provides wavelength division multiplexing equipment and an optical signal processing method, which are used for reducing the configuration cost of a wavelength division multiplexing system. The wavelength division multiplexing equipment and the optical signal processing method provided by the embodiment of the application can be applied to a wavelength division multiplexing system. The wavelength division multiplexing system can be applied to networks such as a backbone network and a metropolitan area network.

As an example, the wavelength division multiplexing device is applied to a metropolitan area network. Take a ring metropolitan area network as an example. The ring structure adopted by the ring metropolitan area network may be referred to as a convergence ring. As described with reference to fig. 2, the aggregation ring includes at least one aggregation node and a plurality of integrated service access (CO) nodes. The convergence ring adopts a bidirectional deployment mode. In fig. 2, the sink nodes include 2 sink nodes, which are sink node a and sink node B, respectively. The CO nodes include 4 for example, CO1, CO2, CO3, and CO4. The two sink nodes and the 4 CO nodes are connected through optical fibers. The two sink nodes are used for receiving the service data of the CO, and the two sink nodes can also play a role in load sharing. When any CO node on the aggregation ring fails, other CO nodes need to adjust the transmission direction of the optical signal to realize fast recovery of the wavelength connection from the CO node to the two aggregation nodes, so as to avoid transmission interruption or congestion of service data. In order to realize the rapid recovery of the wavelength connection from the CO node to the two sink nodes, a mode of optical layer WSON may be adopted.

In some embodiments, the CO node may employ the ROADM architecture shown in fig. 1. However, the configuration using a non-directional ROADM requires the configuration of the optical layer local dimension, resulting in higher configuration cost. The application provides another wavelength division multiplexing device which can be applied to a CO node, configuration of optical layer local dimension is not needed, and optical layer configuration cost can be saved.

Fig. 3A is a schematic structural diagram of a wavelength division multiplexing device in an embodiment of the present application. As shown in fig. 3A, the wdm apparatus includes a first demultiplexing unit 310, a first multiplexing unit 320, a second demultiplexing unit 330, and a second multiplexing unit 340. The first demultiplexing unit 310 has optical connections with the first multiplexing unit 320 and the second demultiplexing unit 330. The first multiplexer unit 320 is also optically connected to the second multiplexer unit 340. The second demultiplexing unit 330 is also optically connected to the second multiplexing unit 340. The input end of the first demultiplexing unit 310 is optically connected to the output end of the second demultiplexing unit 330, and the output end of the first demultiplexing unit 310 is optically connected to the input end of the first multiplexing unit 320 and the input end of the second demultiplexing unit 330, respectively. The input end of the first combining unit 320 is also optically connected to the output end of the second combining unit 340, and the output end of the first combining unit 320 is optically connected to the input end of the second combining unit 340. The output end of the second demultiplexing unit 330 is also optically connected to the input end of the second multiplexing unit 340. The output of the second multiplexing unit 340 is also optically connected to the first adjacent wavelength division multiplexing device. In the embodiment of the present application, the wave splitting unit may also be referred to as a down wave unit for performing distribution of down wave signals, and the wave combining unit may also be referred to as an up wave unit for performing combination of up wave signals. The first wavelength division unit 310 and the second wavelength division unit 340 are used to combine and divide the connected OTUs. The first multiplexing unit 320 and the second demultiplexing unit 330 are used to perform upper and lower multiplexing/demultiplexing on the connected OTU. For convenience of distinction, the OTU optically connected to the first demultiplexing unit 310 and the second multiplexing unit 340 is referred to as a first OTU. The OTU optically connected to the first multiplexing unit 320 and the second demultiplexing unit 330 is referred to as a second OTU.

In some embodiments, the first wave splitting unit 310 and the second wave combining unit 340 may be disposed on the same board. The first wave combining unit 320 and the second wave splitting unit 340 may be disposed on the same board. When the wave splitting unit and the wave combining unit are disposed on the same single board, the single board may be referred to as a wave combiner/splitter, or a wave combining/splitting single board, and other names may also be used. Fig. 3B is a schematic structural diagram of another wavelength division multiplexing device in the embodiment of the present application. In fig. 3B, a single board disposed by the first demultiplexing unit 310 and the second multiplexing unit 340 is referred to as a single board 1, and a single board disposed by the first multiplexing unit 320 and the second demultiplexing unit 340 is referred to as a single board 2.

In some embodiments, the first wave splitting unit 310, the second wave combining unit 340, the first wave combining unit 320 and the second wave splitting unit 340 may also be separately deployed. The wavelength division unit may also be referred to as a wavelength division filter or a wavelength division single board, and other names may also be used, which is not specifically limited in this embodiment of the present application.

Fig. 4 is a schematic deployment diagram of a wavelength division multiplexing device in an embodiment of the present application. As shown in fig. 4, the output of the first wavelength-splitting unit 310 is also in direct optical connection with at least one first OTU. The input of the second multiplexing unit 340 is also in direct optical connection with at least one first OTU. The input end of the first multiplexing unit 320 is also directly optically connected to at least one second OTU. The output of the second wavelength-splitting unit 330 is also in direct optical connection with at least one second OTU. The number of the first OTUs that the wavelength division multiplexing device supports to connect is related to the number of ports included at the output of the first wavelength division unit 310 and the number of ports included at the input of the second wavelength multiplexing unit 340. Illustratively, the number of the first OTUs connected by the wavelength division multiplexing device is less than or equal to the minimum value of the number of ports included in the output terminal of the first wavelength division multiplexing unit 310 and the number of ports included in the input terminal of the second wavelength multiplexing unit 340. The number of the second OTUs that the wavelength division multiplexing device supports connection is related to the number of ports included at the output of the second wavelength division multiplexing unit 330 and the number of ports included at the input of the first wavelength multiplexing unit 320. Illustratively, the number of the second OTUs connected by the wavelength division multiplexing device is less than or equal to the minimum value of the number of ports included in the output end of the second wavelength division multiplexing unit 330 and the number of ports included in the input end of the first wavelength multiplexing unit 320.

In some embodiments, the wavelength division multiplexing device has at least two adjacent wavelength division multiplexing devices, and is connected to the two adjacent wavelength division multiplexing devices by an optical fiber. For convenience of description, two wavelength division multiplexing devices adjacent to the wavelength division multiplexing device are referred to as a first adjoining wavelength division multiplexing device and a second adjoining wavelength division multiplexing device, respectively, as shown in fig. 4. The input end of the first wavelength division multiplexing unit 310 is further optically connected to a first adjacent wavelength division multiplexing device, and the output end of the first wavelength combining unit 320 is further optically connected to a second adjacent wavelength division multiplexing device. The input end of the second wavelength division unit 330 is further optically connected to the second adjacent wavelength division multiplexing device, and the output end of the second wavelength division unit 330 is further optically connected to the first adjacent wavelength division multiplexing device.

In a possible implementation manner, the wavelength division multiplexing device may further include a controller 350, where the controller 350 is configured to control the first wavelength division unit 310, the second wavelength division unit 330, the first multiplexing unit 320, and the second multiplexing unit 340 on the wavelength division multiplexing device, and a specific control manner is described in detail later, and is not described herein again.

For convenience of description, a direction of connection with the first adjacent wavelength division multiplexing device on the wavelength division multiplexing device will be referred to as an a direction, and a link between the wavelength division multiplexing device and the first adjacent wavelength division multiplexing device will be referred to as an a direction link for short. Subsequently, the direction of the wavelength division multiplexing device connected with the second adjacent wavelength division multiplexing device is called as the B direction, and the link between the wavelength division multiplexing device and the second adjacent wavelength division multiplexing device is called as the B direction link for short.

Fig. 5 is a schematic diagram of a signal processing method of the wavelength division multiplexing device when the a-direction link and the B-direction link are normal in the embodiment of the present application. The following describes a signal processing method in which both the a-direction link and the B-direction link are normal, with reference to fig. 5.

When both the a-direction link and the B-direction link are normal, the signal flow in the wavelength division multiplexing device is indicated by a solid line in fig. 5. Taking the optical signal sent by the first adjacent wavelength division multiplexing device to the wavelength division multiplexing device as the first optical signal as an example, the first wavelength division unit 310 separates the second optical signal and the third optical signal to be sent to at least one first OTU from the received first optical signal.

It should be noted that the first wavelength division unit 310 may separate, according to the wavelength of each first OTU, a second optical signal that needs to be sent to the first OTU from the first optical signal, and perform a sending operation. The third optical signal may be understood as an optical signal other than the second optical signal of the at least one first OTU from the first optical signal. For example, the first optical signal includes optical signals to be sent to 3 first OTUs, and optical signals other than the optical signals of the 3 first OTUs in the first optical signal are third optical signals. The first wavelength division unit 310 sends the third optical signal to the first multiplexing unit 320, and sends the third optical signal to the second adjacent wavelength division multiplexing device through the first multiplexing unit 320. In some embodiments, optical signals to be sent exist on the one or more second OTUs, and for convenience of distinction, the optical signals to be sent by the one or more second OTUs are collectively referred to as a fourth optical signal. One or more second OTUs respectively send the fourth optical signal to be sent to the first multiplexer unit 320, and the first multiplexer unit 320 may combine the fourth optical signal and the third optical signal and send the combined fourth optical signal and the combined third optical signal to the second adjacent wavelength division multiplexing device.

The second wavelength division unit 330 separates a sixth optical signal and a seventh optical signal to be sent to at least one second OTU from the received fifth optical signal. The fifth optical signal is an optical signal received from the second adjoining wavelength division multiplexing device when both the a-directional link and the B-directional link are normal.

It should be noted that, the second wavelength division unit 330 may separate, according to the wavelength of each second OTU, the sixth optical signal that needs to be sent to the second OTU from the fifth optical signal, and perform a sending operation. The seventh optical signal may be understood as an optical signal of the fifth optical signal other than the sixth optical signal of the at least one second OTU. For example, the fifth optical signal includes optical signals to be sent to 2 second OTUs, and optical signals other than the optical signals of the 2 second OTUs in the fifth optical signal are seventh optical signals. The second wavelength division unit 330 sends the seventh optical signal to the second multiplexing unit 340, and sends the seventh optical signal to the first adjacent wavelength division multiplexing device through the second multiplexing unit 340.

In some embodiments, there is an optical signal that needs to be sent on one or more first OTUs, and for convenience of distinction, the optical signals of one or more second OTUs are collectively referred to as an eighth optical signal. The one or more first OTUs respectively send the eighth optical signal to be sent to the second multiplexer unit 340, and the second multiplexer unit 340 may combine the eighth optical signal and the seventh optical signal and send the combined signal to the first adjacent wavelength division multiplexing device.

In some embodiments, the controller may control the first demultiplexing unit 310 to cross the third optical signal light to the first multiplexing unit 320 when both the a-direction link and the B-direction link are normal. And controls the first multiplexing unit 320 to cross the fourth optical signal light to the second adjoining wavelength division multiplexing device. The second wavelength division unit 330 is controlled to cross the seventh optical signal light to the second multiplexing unit 340, and the second multiplexing unit 340 is controlled to cross the eighth optical signal light to the first adjoining wavelength division multiplexing device.

Fig. 6 is a schematic diagram of a signal processing manner of the wdm apparatus when the B-direction link fails in the embodiment of the present application. The signal processing method when the B-direction link fails is described below with reference to fig. 6.

When the B-direction link fails, the optical signal that needs to be sent to the second adjacent wavelength division multiplexing device is sent to the first adjacent wavelength division multiplexing device through the second wavelength division unit 330 and the second wavelength combination unit 340. When ring networking is adopted, the optical signals forwarded from the B direction are switched to the A direction to be forwarded to the corresponding OTU or the network side.

The first wavelength demultiplexing unit 310 separates the third optical signal from the received first optical signal, and then transmits the third optical signal to the second wavelength demultiplexing unit 330. In some embodiments, when the B-directional link fails, the controller controls the first demultiplexing unit 310 to interleave the third optical signal light to the second demultiplexing unit 330, and controls the first multiplexing unit 320 to interleave the fourth optical signal light to the second multiplexing unit 340. The second demultiplexing unit 330 may perform a demultiplexing operation to separate the optical signal required by the second OTU from the third optical signal. In the embodiment of the present application, when performing the wavelength division operation, the second wavelength division unit 330 may perform the separation operation according to the wavelength of the second OTU. It should be noted that, when the B-directional link fails, the second wavelength division multiplexing unit 330 does not receive the optical signal directly from the second adjacent wavelength division multiplexing device. When the B-direction link fails, the second demultiplexing unit 330 receives only the optical signal from the first demultiplexing unit 310. For example, the optical signal to be sent to the second OTU, which is separated from the third optical signal, is referred to as an optical signal 9. The optical signal 9 is sent to the second OTU. The optical signal other than the optical signal 9 in the third optical signal is referred to as an optical signal 10. The optical signal 10 is sent to the second multiplexing unit 340. When there is no optical signal to be transmitted on the first OTU, the second multiplexing unit 340 may transmit the optical signal 10 to the first adjacent wavelength division multiplexing device. When there is an optical signal that needs to be sent on the first OTU, the second multiplexing unit 340 directly receives the optical signal that needs to be sent by the first OTU from the first OTU. For convenience of distinction, the optical signal that the first OTU needs to send is referred to as an eighth optical signal, although the first OTU may include a plurality of OTUs, and the first OTUs that need to send the optical signal at different times may be different. The number of first OTUs that need to transmit optical signals at different times may also be different. After receiving the eighth optical signal, the second multiplexing unit 340 may combine the optical signal 10 and the eighth optical signal and send the combined optical signal to the first adjacent wavelength division multiplexing device.

In some embodiments, when the B-directional link fails, the first multiplexing unit 320 does not receive the optical signal from the first demultiplexing unit 310. If there is an optical signal that needs to be sent on the second OTU, the first multiplexer unit 320 may directly receive the optical signal that needs to be sent on the second OTU from the second OTU. For convenience of description, the optical signal that needs to be sent on the second OTU is also referred to as a fourth optical signal herein. The first multiplexing unit 320 sends the fourth optical signal to the second multiplexing unit 340. Therefore, the second multiplexing unit 340 may multiplex the fourth optical signal, the eighth optical signal, and the optical signal 10 and transmit the multiplexed optical signal to the first adjacent wavelength division multiplexing device.

Fig. 7 is a schematic diagram of a signal processing method of the wdm apparatus when the a-directional link fails in the embodiment of the present application. The signal processing method when the a-direction link fails is described below with reference to fig. 7.

When the a-direction link fails, the optical signal that needs to be sent to the first adjacent wavelength division multiplexing device is sent to the second adjacent wavelength division multiplexing device through the first wavelength division unit 310 and the first wavelength combination unit 320. When ring networking is adopted, the optical signals forwarded from the A direction are switched to the B direction to be forwarded to the corresponding OTU or the network side.

The second wavelength division unit 330 separates a sixth optical signal and a seventh optical signal to be sent to at least one second OTU from the received fifth optical signal, and sends the sixth optical signal to at least one second OTU. Since the a-direction link fails, the second demultiplexing unit 330 does not transmit the seventh optical signal to the second multiplexing unit 340, but transmits the seventh optical signal to the first demultiplexing unit 310. In some embodiments, when the a-directional link fails, the controller controls the second wavelength division unit 330 to cross the seventh optical signal, light, to the first wavelength division unit 310; and controlling the second multiplexing unit 340 to cross the eighth optical signal, light, to the first multiplexing unit 320. The first wavelength-division unit 310 may perform a wavelength-division operation to separate the optical signal required by the second OTU from the seventh optical signal. In the embodiment of the present application, when performing the wavelength division operation, the first wavelength division unit 310 may perform the separation operation according to the wavelength of the second OTU. It should be noted that, when the a-direction link fails, the first wavelength division unit 310 may not receive the optical signal directly from the first adjacent wavelength division multiplexing device, and the first wavelength division unit 310 may receive the optical signal from the first wavelength division unit 310. For example, the optical signal to be transmitted to the second OTU, which is separated from the seventh optical signal, is referred to as an optical signal 11. The optical signal 11 is sent to the second OTU. The optical signals other than the optical signal 11 in the seventh optical signal are referred to as optical signals 12. The optical signal 12 is sent to the first multiplexer unit 320. When there is no optical signal to be transmitted on the second OTU, the first multiplexer unit 320 may transmit the optical signal 11 to the second adjacent wavelength division multiplexing device. When there is an optical signal that needs to be sent on the second OTU, the first multiplexer unit 320 directly receives the optical signal that needs to be sent by the second OTU from the second OTU. For convenience of distinction, the optical signal that the second OTU needs to send is referred to as a fourth optical signal, and certainly, the second OTU to which the wavelength division multiplexing device is directly connected may include a plurality of OTUs, and the second OTUs that need to send the optical signal at different times may be different. The number of second OTUs that need to transmit optical signals at different times may also be different. After receiving the fourth optical signal, the first multiplexing unit 320 may combine the optical signal 12 and the fourth optical signal and send the combined optical signal to the second adjacent wavelength division multiplexing device.

In some embodiments, when the a-direction link fails, the second multiplexing unit 340 does not receive the optical signal from the second demultiplexing unit 330. If the optical signal that needs to be sent exists on the first OTU, the second multiplexing unit 340 may directly receive the optical signal that needs to be sent on the first OTU from the first OTU. For convenience of description, the optical signal that needs to be sent on the first OTU is also referred to as an eighth optical signal herein. The second multiplexing unit 340 transmits the eighth optical signal to the first multiplexing unit 320. Therefore, the first multiplexing unit 320 may multiplex the eighth optical signal, the fourth optical signal, and the optical signal 12 and transmit the multiplexed signal to the second adjacent wavelength division multiplexing device.

In the above scheme provided by the embodiment of the present application, the optical signal of the second OTU is merged onto the main optical path through the first multiplexing unit 320 in the add path of the second OTU. The optical signal with the corresponding wavelength is dropped to a drop port of the local second OTU through the second wavelength splitting unit 330 in the drop path. The upwave path of the first OTU combines the optical signal of the local first OTU onto the main optical path through the second multiplexer unit 340. The optical signal with the corresponding wavelength is down-waved to the down-wave port of the local first OTU through the first wavelength division unit 310. The optical path between the output end of the first combining unit 320 and the input end of the second combining unit 340 can be understood as an upper wave loop of the second OTU. When a connection path between the first multiplexing unit 320 and the second adjacent wavelength division multiplexing device fails, that is, a B-direction link failure, such as a cable failure, the first multiplexing unit 320 merges the optical signal of the local second OTU onto an a-direction optical path through the add circuit. The optical path between the output end of the first wave-splitting unit 310 and the input end of the second wave-splitting unit 330 can be understood as a lower wave loop of the second OTU. When the B-direction link fails, after the optical signal of the lower wave of the second OTU is received by the first wavelength division unit 310, the optical signal is cross-outputted to the second wavelength division unit 330, and the second wavelength division unit 330 separates the optical signal of the local OTU and directly sends the optical signal to the local second OTU. Similarly, the optical path between the output end of the second combining unit 340 and the input end of the first combining unit 320 can be understood as an upper wave loop of the first OTU. In the case of an a-direction link failure, such as a cable failure, the second combining unit 340 combines the optical signal of the local first OTU onto the B-direction optical path through the add circuit. The optical path between the output end of the second wave splitting unit 330 and the input end of the first wave splitting unit 310 can be understood as a lower wave loop of the first OTU. When the a-direction link fails, after the optical signal of the first OTU is received by the second wavelength division unit 330, the optical signal is cross-outputted to the first wavelength division unit 310, and the first wavelength division unit 310 separates the optical signal of the local first OTU and directly sends the optical signal to the local first OTU. According to the method and the device, optical layer protection during fault can be realized without configuring optical layer local dimension, only an upper wave loop and a lower wave loop need to be established, devices such as a WSS (wavelength division multiplexing) device and the like with local dimension do not need to be additionally added, resources can be reduced, and configuration cost of wavelength division multiplexing equipment is reduced.

The following is a description of the structure of each component in the wavelength division multiplexing device. For ease of description, the numbering of the various components is not illustrated.

Fig. 8 is a schematic structural diagram of another wavelength division multiplexing device in an embodiment of the present application. As shown in fig. 8, the first demultiplexing unit includes N +2 output ports including a first input port, a second input port, a first output port, and a second output port. The second wave-splitting unit comprises N +2 output ports including a third input port, a fourth input port, a third output port and a fourth output port. The first multiplexing unit comprises N +2 input ports including a fifth output port, a sixth output port, a fifth input port and a sixth input port. The second multiplexer unit comprises N +2 input ports including a seventh output port, an eighth output port, a seventh input port and an eighth input port, wherein N is a positive integer.

Wherein the first input port of the first wavelength division multiplexing unit is optically connected to the first adjacent wavelength division multiplexing device. The second input port of the first wave-splitting unit is optically connected with the third output port of the second wave-splitting unit. The first output port of the first wave-splitting unit is optically connected with the fifth input port of the first wave-combining unit. The second output port of the first wavelength-splitting unit is optically connected to the third input port of the second wavelength-splitting unit. N1 output ports except the first output port and the second output port in the first wavelength division unit are directly optically connected with N1 first OTUs in a one-to-one correspondence mode, and N1 is smaller than or equal to N.

And the sixth input port of the first multiplexing unit is optically connected with the seventh output port of the second multiplexing unit. The N input ports except the fifth input port and the sixth input port in the first multiplexing unit are directly optically connected with the N second OTUs in a one-to-one correspondence mode. The fifth output port of the first multiplexing unit is optically connected with the second adjacent wavelength division multiplexing equipment, and the sixth output port is optically connected with the seventh input port of the second multiplexing unit.

The fourth input port of the second wavelength division unit is optically connected to the second adjacent wavelength division multiplexing device. And the fourth output port of the second wave division unit is optically connected with the eighth input port of the second wave combination unit. And N2 output ports except for the third output port and the fourth output port in the second wave splitting unit are directly optically connected with N2 second OTUs in a one-to-one correspondence mode, and N2 is smaller than or equal to N. And an eighth output port of the second multiplexing unit is optically connected with the first adjacent wavelength division multiplexing equipment, and input ports of N1 except the seventh input port and the eighth input port in the second multiplexing unit are directly optically connected with the N1 first OTUs in a one-to-one correspondence manner.

The wavelength division unit and the wavelength combining unit according to the present application may have any of the following configurations. In a first possible implementation manner, the wavelength division unit includes a coupler and a WSS. The wave-combining unit comprises a light splitter and a WSS. In a second possible implementation manner, the wavelength division unit includes a WSS. The wave combining unit comprises a WSS. In a third possible implementation manner, the wavelength division unit includes an optical switch and a WSS. The wave combining unit comprises an optical switch and a WSS. The three possible implementations described above are described below with reference to the drawings.

Example 1, the structure of the wavelength division multiplexing device will be described with reference to fig. 9 to 12 when the first possible implementation manner is adopted for the structures of the wavelength division unit and the multiplexing unit. The wave splitting unit comprises a coupler and a WSS, and the wave combining unit comprises an optical splitter and a WSS. For the sake of convenience of distinction, the coupler included in the first wave-splitting unit is referred to as a first coupler, and the coupler included in the second wave-splitting unit is referred to as a second coupler. The optical splitter included in the first multiplexing unit is called a first optical splitter, and the optical splitter included in the second multiplexing unit is called a second optical splitter. WSSs included in the first to fourth wavelength division units are referred to as first to fourth WSSs, respectively.

Fig. 9 is a schematic structural diagram of a wavelength division multiplexing device provided in example 1 of the present application. As shown in fig. 9, the input end of the first coupler is optically connected to the output ends of the first adjoining wavelength division multiplexing device and the second WSS, respectively. The output of the first coupler is optically connected to the input of the first WSS. The output end of the first WSS is respectively optically connected with the input end of the third WSS and the input end of the second coupler, and the output end of the first WSS is also directly and optically connected with at least one first OTU. The input end of the third WSS is also optically connected to the output end of the second optical splitter, and the input end of the third WSS is also optically connected directly to at least one second OTU. The output of the third WSS is optically connected to the input of the first optical splitter. The output end of the first optical splitter is optically connected to the second adjacent wavelength division multiplexing device and the fourth WSS, respectively. The input of the second coupler is also optically connected to a second adjacent wavelength division multiplexing device. The output end of the second coupler is optically connected with the input end of the second WSS, the output end of the second WSS is also optically connected with the fourth WSS, and the output end of the second WSS is also directly optically connected with at least one second OTU. The input end of the fourth WSS is also in direct optical connection with at least one first OTU, the output end of the fourth WSS is in optical connection with the input end of the second optical splitter, and the output end of the second optical splitter is also in optical connection with the first adjacent wavelength division multiplexing equipment.

In a possible embodiment, the wavelength division multiplexing device further comprises at least 4 optical amplifiers, namely a first optical amplifier, a second optical amplifier, a third optical amplifier and a fourth optical amplifier.

Fig. 10 is a schematic structural diagram of another wavelength division multiplexing device provided in example 1 of the present application. Referring to fig. 10, a first optical amplifier is disposed between the first coupler and the first WSS; the second optical amplifier is arranged between the first coupler and the second WSS; the third optical amplifier is arranged between the first optical splitter and the third WSS; the fourth optical amplifier is disposed between the second optical splitter and the fourth WSS. The amplifier is used for adjusting the power of the input signal. Illustratively, the first optical amplifier is disposed in the first wavelength-division unit, the second optical amplifier is disposed in the first wavelength-combination unit, the third optical amplifier is disposed in the second wavelength-division unit, and the fourth optical amplifier is disposed in the second wavelength-combination unit. In some embodiments, the first WSS and the fourth WSS may be deployed on the same single board, or may be deployed on different single boards. The second WSS and the third WSS may be deployed on the same single board, or may be deployed on different single boards. In other embodiments, the first coupler, the first Optical Amplifier (OA), the first WSS, the second optical splitter, the fourth OA, and the fourth WSS are disposed on the same board. The second WSS, the second OA, the second coupler, the first optical splitter, the third OA and the third WSS are disposed on the same single board.

Fig. 10 is a schematic view of another wavelength division multiplexing device provided in example 1 of the present application. As shown in fig. 11, the first optical amplifier is disposed at the input end of the first wavelength division unit, and the first coupler of the first wavelength division unit is optically connected to the first adjacent wavelength division multiplexing device through the first optical amplifier. The third optical amplifier is disposed at the output end of the first multiplexing unit, and the first optical splitter of the first multiplexing unit is optically connected with the second adjacent wavelength division multiplexing device through the second optical amplifier. The second optical amplifier is disposed at an input end of the second wavelength division unit, and the second coupler of the second wavelength division unit is optically connected to the second adjacent wavelength division multiplexing device through the second optical amplifier. The fourth optical amplifier is disposed at the output end of the second wave-combining unit, and the second optical splitter of the second wave-combining unit is optically connected with the first adjacent wavelength division multiplexing device through the fourth optical amplifier.

Fig. 12 is a schematic diagram illustrating a connection relationship between ports in the wavelength division multiplexing device according to example 1 of the present application. The connection relationship of the respective ports in the wavelength division multiplexing device is described in fig. 12 from the port angle described in fig. 8. As shown in fig. 12, the input terminals of the first coupler include a first input port and a second input port. The first WSS may employ a WSS of 1 × N + 2. The first WSS includes one input port and N +2 output ports. The N +2 output ports include a first output port, a second output port, and other N output ports for connecting OTUs. The output port of the first coupler is optically connected to the input port of the first WSS. The second wave splitting unit includes a second coupler and a second WSS, the second coupler including a third input port and a fourth input port. The second WSS may employ 1 x (N + 2) WSSs. The second WSS includes one input port and N +2 output ports. The N +2 output ports include a third output port and a fourth output port and other N output ports for connecting OTUs. The output port of the second coupler is optically connected to the input port of the second WSS. The first multiplexing unit comprises a first optical splitter and a third WSS, and the first optical splitter comprises a fifth output port and a sixth output port. The third WSS may employ a WSS of (N + 2) × 1. The third WSS includes N +2 input ports and one output port. The N +2 input ports include a fifth input port and a sixth input port and other N input ports for connecting OTUs. The input port of the first optical splitter is optically connected with the output port of the third WSS; the second multiplexing unit comprises a second optical splitter and a fourth WSS, and the second optical splitter comprises a seventh output port and an eighth output port. The fourth WSS may employ a WSS of (N + 2) × 1. The fourth WSS includes N +2 input ports and one output port. The N +2 input ports include a seventh input port and an eighth input port and other N input ports for connecting OTUs. The input port of the second optical splitter is optically connected to the output port of the fourth WSS.

As an example, the wavelength of the first OTU is λ a, and the wavelength of the second OTU is λ b. On the add path of the second OTU, the add optical signal of the second OTU is locally added to the B-direction main optical path through the add port (input port) of the third WSS. On the lower wave path of the second OTU, the corresponding wavelength optical signal is lower wave-launched to the lower wave port of the local second OTU through the second WSS wavelength division port (output port). On the add path of the first OTU, add the add optical signal of the local first OTU into the a-direction main optical path through the add port (input port) of the fourth WSS. On the lower wave path of the first OTU, the corresponding wavelength optical signal is lower wave-launched to the lower wave port of the local first OTU through the first WSS wavelength division port (output port).

For the B-link, in normal operation, the third WSS combines the optical signal at the pass-through wavelength (i.e., the optical signal from the first wavelength-splitting unit) and the local up-wavelength λ B. Under the control of the controller, the third WSS performs optical cross-connection, inputting the combined optical signal into the B-direction main optical path. The optical path from the output port of the first optical splitter to the input port of the fourth WSS of the third WSS can be understood as the add-on loop of the second OTU. The output port of the first WSS reaches the second WSS via the second coupler, which can be understood as the lower wave loop of the second OTU.

When an optical cable or the like connected to the second adjacent wavelength division multiplexing device in the direction B has a fault, the third WSS transmits the optical signal with the wavelength λ B of the second OTU to the fourth WSS through the add circuit. The third WSS can perform wavelength cross-connection under the control of the controller to complete the switching of the signal route of the upper wavelength λ b. When the optical cable in the direction B has a fault, the optical signal with the wavelength lambdab input from the dimension of the direction A enters the first WSS. The first WSS performs optical interleaving under the control of the controller, and inputs an optical signal of a wavelength λ b to a down-wave loop of the wavelength λ b through the drop port of the first WSS. The optical signal with the lower wavelength lambdab is combined into a main optical path from the B direction to the A direction through a second coupler of the lower wave loop. The second WSS performs optical cross-connect, inputting the optical signal of wavelength λ b to the receiving port of the second OTU, thereby completing the lower-wave route switching of the lower-wave wavelength λ b.

Similarly, for the a-directional link, in normal operation, the controller controls the a-directional fourth WSS to combine the optical signal at the pass-through wavelength (i.e., the optical signal from the first wavelength division unit) and the optical signal at the local add wavelength λ a. The fourth WSS performs optical cross-connect, inputting the combined optical signal into the a-direction main optical path. The upwave loop of the first OTU may be: fourth WSS → second splitter output port → input port of second WSS. The output port of the second WSS → the first coupler → the first WSS, can be understood as the down wave loop of the first OTU. When the optical cable connected with the first adjacent wavelength division multiplexing equipment in the direction a or the like fails, the fourth WSS performs wavelength cross connection under the control of the controller, and transmits the optical signal with the wavelength λ a of the first OTU to the third WSS through the add circuit, thereby completing switching of the add wavelength λ a signal route. When the optical cable in the direction A has a fault, the signal light with the wavelength lambda a is input from the dimension of the direction B, enters the second WSS, is provided with corresponding wavelength cross on the second WSS, and enters a lower wave loop with the wavelength lambda a from a sub-wave port of the second WSS. The down wave wavelength lambda a is combined into a main optical path from the A direction to the B direction through a down wave loop. And a rule that the wavelength is crossed and is down to a receiving port of a connected first OTU is configured on the first WSS, so that the lower wave route switching of the lower wave wavelength lambda a is completed.

Example 2, the structure of the wavelength division multiplexing device is described with reference to fig. 13 to 14 when a second possible implementation manner is adopted for the structures of the wavelength division multiplexing unit and the wave combining unit. The wavelength division unit and the wavelength combination unit in the wavelength division multiplexing equipment comprise a WSS. The first and second demultiplexing units each comprise a WSS having two input ports and N +2 output ports, i.e. a 2 x (N + 2) WSS. The first and second multiplexing units each include a WSS having two output ports and N +2 input ports, i.e., (N + 2) × 2WSS. Fig. 13 is a schematic structural diagram of a wavelength division multiplexing device according to example 2 of the present application, and as shown in fig. 13, the WSS of the first wavelength division unit is referred to as a first WSS, the WSS of the second wavelength division unit is referred to as a second WSS, the WSS of the first wavelength combination unit is referred to as a third WSS, and the WSS of the second wavelength combination unit is referred to as a fourth WSS. In some embodiments, the first WSS and the fourth WSS may be deployed on the same single board, or may be deployed on different single boards. The second WSS and the third WSS may be deployed on the same single board, or may be deployed on different single boards.

In a possible embodiment, the wavelength division multiplexing device further comprises at least 4 optical amplifiers, respectively a first to a fourth optical amplifier. Fig. 14 is a schematic structural diagram of another wavelength division multiplexing device provided in example 2 of the present application, and as shown in fig. 14, a first optical amplifier is disposed at an input end of a first wavelength division unit, and a first coupler of the first wavelength division unit is optically connected to a first adjacent wavelength division multiplexing device through the first optical amplifier. The second optical amplifier is disposed at an input end of the second wavelength division unit, and the second coupler of the second wavelength division unit is optically connected to the second adjacent wavelength division multiplexing device through the second optical amplifier. The third optical amplifier is disposed at the output end of the first wave combining unit, and the third optical switch of the first wave combining unit is optically connected with the second adjacent wavelength division multiplexing device through the third optical amplifier. The fourth optical amplifier is disposed at the output end of the second multiplexing unit, and the fourth optical switch of the second multiplexing unit is optically connected with the first adjacent wavelength division multiplexing device through the fourth optical amplifier.

In some embodiments, the first WSS, the first optical amplifier, the fourth WSS, and the fourth optical amplifier may be disposed on the same board, or may be disposed on different boards. The second WSS, the second optical amplifier, the third WSS and the third optical amplifier may be disposed on the same board, or may be disposed on different boards.

As an example, the wavelength of the first OTU is λ a, and the wavelength of the second OTU is λ b. For the B-link, in normal operation, the third WSS combines the optical signal at the pass-through wavelength (i.e., the optical signal from the first WSS) and the local up-wave wavelength λ B. Under the control of the controller, the third WSS performs optical cross-connection, and inputs the combined optical signal into the B-directional main optical path after passing through the third OA.

Third WSS → input port of fourth WSS, can be understood as the upwave loop of the second OTU. The outlet of the first WSS → the second WSS, can be understood as the downstream loop of the second OTU. When the optical cable connected with the second adjacent wavelength division multiplexing equipment in the direction B or the like fails, the third WSS performs optical cross connection under the control of the controller, and transmits the optical signal with the wavelength λ B of the second OTU to the fourth WSS through the add circuit, thereby completing switching of the add wavelength λ B signal route. When the optical cable in the direction B has a fault, the optical signal with the wavelength lambdab input from the dimension of the direction A enters the first WSS. The first WSS performs optical interleaving under the control of the controller, and inputs an optical signal of a wavelength λ b to a down-wave loop of the wavelength λ b through the drop port of the first WSS. The second WSS receives the optical signal with the wavelength λ B through the add-drop circuit, and then combines the optical signal with the add-drop wavelength λ B into the main optical path in the direction B. The second WSS performs optical cross-connect and inputs the optical signal with wavelength λ b to the receive port of the second OTU, thereby completing the lower-wave route switching at lower wavelength λ b.

Similarly, for the a-directional link, in normal operation, the controller controls the a-directional fourth WSS to combine the optical signal at the pass-through wavelength (i.e., the optical signal from the first wavelength division unit) and the optical signal at the local add wavelength λ a. The fourth WSS performs optical cross-connection, inputting the combined optical signal into the main optical path from direction B to direction a. The upwave loop of the first OTU may be: fourth WSS → input port of second WSS. Outlet of the second WSS → the first WSS, which can be understood as the down wave loop of the first OTU. When the optical cable connected with the first adjacent wavelength division multiplexing equipment in the direction a fails, the fourth WSS performs wavelength cross connection under the control of the controller, and sends the optical signal with the wavelength λ a of the first OTU to the third WSS through the add-wave loop, thereby completing switching of the add-wave wavelength λ a signal route. When the optical cable in the direction A has a fault, an optical signal with the wavelength lambda a is input from the dimension of the direction B and enters the second WSS. The second WSS performs optical cross-connection under the control of the controller, entering the drop loop of wavelength λ a through the drop port of the second WSS. The first WSS combines an optical signal with a lower wavelength lambda a into a main optical path from the A direction to the B direction under the control of the controller. The first WSS executes optical cross connection to output an optical signal of the lower wavelength λ a to a receiving port of the first OTU, completing lower wavelength λ a lower wavelength route switching.

According to the method and the device, optical layer protection during fault can be realized without configuring optical layer local dimension, only an upper wave loop and a lower wave loop need to be established, devices such as a WSS (wavelength division multiplexing) device with local dimension do not need to be additionally added, and the configuration cost of wavelength division multiplexing equipment is reduced.

Example 3, the structure of the wavelength division multiplexing device will be described with reference to fig. 15 to 18 when a second possible implementation manner is adopted for the structures of the wavelength division multiplexing unit and the multiplexing unit. The wavelength division unit and the wave combination unit in the wavelength division multiplexing equipment comprise an optical switch and a WSS. For convenience of distinction, the optical switch included in the first wavelength division unit is referred to as a first optical switch, and the optical switch included in the second wavelength division unit is referred to as a second optical switch. The optical switch included in the first multiplexing unit is called a third optical switch, and the optical switch included in the second multiplexing unit is called a fourth optical switch. The WSS included in the first wave-splitting unit is called a first WSS, the WSS included in the second wave-splitting unit is called a second WSS, the WSS included in the first wave-combining unit is called a third WSS, and the WSS included in the second wave-combining unit is called a fourth WSS. Fig. 15 is a schematic structural diagram of a wavelength division multiplexing device according to example 3 of the present application. As shown in fig. 15, the input ends of the first optical switch are optically connected to the output ends of the first adjacent wavelength division multiplexing device and the second WSS, respectively. The output of the first optical switch is optically connected to the input of the first WSS. The output end of the first WSS is respectively optically connected with the input end of the third WSS and the input end of the second optical switch, and the output end of the first WSS is also directly optically connected with at least one first OTU. The input of the third WSS is further optically connected to the output of the fourth optical switch, and the input of the third WSS is further optically connected directly to at least one second OTU. The output of the third WSS is optically connected to the input of the third optical switch. The output end of the first optical splitter is optically connected to the second adjacent wavelength division multiplexing device and the fourth WSS, respectively. The input of the second optical switch is also optically connected to a second adjacent wavelength division multiplexing device. The output end of the second optical switch is optically connected with the input end of the second WSS, the output end of the second WSS is also optically connected with the fourth WSS, and the output end of the second WSS is also directly optically connected with at least one second OTU. The input of the fourth WSS is also in direct optical connection with the at least one first OTU. The output end of the fourth WSS is optically connected to the input end of the fourth optical switch, and the output end of the fourth optical switch is also optically connected to the first adjacent wavelength division multiplexing device.

In a possible embodiment, the wavelength division multiplexing device further comprises at least 4 optical amplifiers, respectively a first to a fourth optical amplifier.

Fig. 16 is a schematic structural diagram of another wavelength division multiplexing device provided in example 3 of the present application. As shown in fig. 16, the first optical amplifier is disposed between the first optical switch and the first WSS; the second optical amplifier is arranged between the second optical switch and the second WSS; the third optical amplifier is arranged between the third optical switch and the third WSS; the fourth optical amplifier is disposed between the fourth optical switch and the fourth WSS. The amplifier is used for adjusting the power of the input signal. Illustratively, the first optical amplifier is disposed in the first wavelength-division unit, the second optical amplifier is disposed in the first wavelength-combination unit, the third optical amplifier is disposed in the second wavelength-division unit, and the fourth optical amplifier is disposed in the second wavelength-combination unit. In some embodiments, the first WSS and the fourth WSS may be deployed on the same single board. The second WSS and the third WSS may be deployed on the same single board. In other embodiments, the first optical switch, the first OA, the first WSS, the fourth optical switch, the fourth OA, and the fourth WSS are disposed on the same board. The second WSS, the second OA, the second optical switch, the third OA and the third WSS are disposed on the same single board.

Fig. 17 is a schematic structural diagram of another wavelength division multiplexing device provided in example 3 of the present application. As shown in fig. 17, the first optical amplifier is disposed at the input end of the first wavelength division unit, and the first optical switch of the first wavelength division unit is optically connected to the first adjacent wavelength division multiplexing device through the first optical amplifier; the second optical amplifier is arranged at the input end of the second wavelength division unit, and a second optical switch of the second wavelength division unit is optically connected with the second adjacent wavelength division multiplexing equipment through the second optical amplifier; the third optical amplifier is arranged at the output end of the first wave combining unit, and a third switch of the first wave combining unit is optically connected with the second adjacent wavelength division multiplexing equipment through the third optical amplifier; the fourth optical amplifier is disposed at the output end of the second multiplexing unit, and the fourth optical switch of the second multiplexing unit is optically connected with the first adjacent wavelength division multiplexing device through the fourth optical amplifier. In some embodiments, the first optical switch, the first OA, the first WSS, the fourth optical switch, the fourth OA, and the fourth WSS are disposed on a same board. The second WSS, the second OA, the second optical switch, the third OA and the third WSS are disposed on the same single board.

Fig. 18 is a schematic diagram illustrating a connection relationship between ports in a wavelength division multiplexing device according to example 3 of the present application. The connection relationship of the respective ports in the wavelength division multiplexing device is described in fig. 18 from the port angle described in fig. 8. As shown in fig. 18, the input terminals of the first optical switch include a first input port and a second input port. The first WSS may employ a WSS of 1 × N + 2. The first WSS includes one input port and N +2 output ports. The N +2 output ports include a first output port, a second output port, and other N output ports for connecting OTUs. The output port of the first optical switch is optically connected to the input port of the first WSS via the first OA. The second wavelength division unit includes a second optical switch including a third input port and a fourth input port, and a second WSS. The second WSS may employ 1 x (N + 2) WSSs. The second WSS includes one input port and N +2 output ports. The N +2 output ports include a third output port and a fourth output port and other N output ports for connecting OTUs. The output port of the second optical switch is optically connected to the input port of the second WSS via the second OA. The first multiplexing unit comprises a third optical switch and a third WSS, and the third optical switch comprises a fifth output port and a sixth output port. The third WSS may employ a WSS of (N + 2) × 1. The third WSS includes N +2 input ports and one output port. The N +2 input ports include a fifth input port and a sixth input port and other N input ports for connecting OTUs. The input port of the third optical switch is optically connected to the output port of the third WSS through the third OA; the second multiplexer unit comprises a fourth optical switch and a fourth WSS, and the fourth optical switch comprises a seventh output port and an eighth output port. The fourth WSS may employ a WSS of (N + 2) × 1. The fourth WSS includes N +2 input ports and one output port. The N +2 input ports include a seventh input port and an eighth input port and other N input ports for connecting OTUs. The input port of the fourth optical switch is optically connected to the output port of the fourth WSS via a fourth OA.

For example, the wavelength of the first OTU is λ a, and the wavelength of the second OTU is λ b. For the B-link, in normal operation, the third WSS combines the optical signal at the pass-through wavelength (i.e., the optical signal from the first wavelength-splitting unit) and the local up-wavelength λ B. Under the control of the controller, the third WSS performs optical cross-connection, inputting the combined optical signal into the B-direction main optical path. The third WSS sends the combined optical signal to the third optical switch via the third OA. And the input port and the fifth output port of the third optical switch are conducted under the control of the controller. The third optical switch is sent to the second adjacent wavelength division multiplexing device through the fifth output port.

The third WSS → the third OA → the sixth output port of the third optical switch → the seventh input port of the fourth WSS, can be understood as the add-on loop of the second OTU. The second output port of the first WSS → the third input port of the second optical switch → the second OA → the second WSS, can be understood as the down wave loop of the second OTU. When an optical cable or the like connected to the second adjacent wavelength division multiplexing device in the direction B has a fault, the third WSS transmits the optical signal with the wavelength λ B of the second OTU to the fourth WSS through the add circuit. And the third optical switch conducts the input port and the sixth output port under the control of the controller, and sends the optical signal with the wavelength lambdab to the fourth WSS. When the optical cable in the direction B has a fault, the first input port and the output port of the first optical switch are connected, and the optical signal with the wavelength λ B input from the dimension in the direction a enters the first WSS. The first WSS performs optical interleaving under the control of the controller, and inputs an optical signal of a wavelength λ b to a down-wave loop of the wavelength λ b through the drop port of the first WSS. The third input port and the output port of the second optical switch are conducted. The optical signal at the lower wavelength λ b is sent to the second WSS via the second optical switch of the lower loop. The second WSS performs optical cross-connect and inputs the optical signal with wavelength λ b to the receive port of the second OTU, thereby completing the lower-wave route switching at lower wavelength λ b.

Similarly, for the a-directional link, in normal operation, the controller controls the a-directional fourth WSS to combine the optical signal at the pass-through wavelength (i.e., the optical signal from the second wavelength division unit) and the optical signal at the local add wavelength λ a. The fourth WSS performs optical cross-connect, inputting the combined optical signal into the a-direction main optical path. And the seventh output port of the fourth optical switch is conducted with the input port. The upwave loop of the first OTU may be: the eighth input port of the fourth WSS → the fourth OA → the seventh output port of the fourth optical switch → the sixth input port of the third WSS. The third output port of the second WSS → the second input port of the first optical switch → the first WSS, can be understood as the drop loop of the first OTU. When an optical cable or the like connected with the first adjacent wavelength division multiplexing device in the direction a fails, the fourth WSS performs wavelength cross connection under the control of the controller, sends the optical signal with the wavelength λ a of the first OTU to the fourth optical switch, and the input port of the fourth optical switch is conducted with the seventh output port under the control of the controller, so that the fourth optical switch sends the optical signal with the wavelength λ a to the third WSS, thereby completing switching of the upper wavelength λ a signal route. When the optical cable in the direction A has a fault, the wavelength lambda a signal light is input from the dimension of the direction B, enters the second WSS, and then is subjected to optical cross connection under the control of the controller and is sent to the first optical switch through the fourth output port. And a second input port on the first optical switch is conducted with the output port, so that the signal light with the wavelength lambda a enters the first WSS and is sent to the first OTU through the wavelength division port of the first WSS. The optical signals except the lower wavelength λ a are combined into the main optical path in the direction B through the lower loop.

Based on the above embodiments, the embodiments of the present application further provide an optical signal processing method, which can be applied to the wavelength division multiplexing device described in any of the above embodiments. The wavelength division multiplexing equipment comprises a first wave division unit, a first wave combination unit, a second wave division unit and a second wave combination unit. Fig. 19 is a flowchart illustrating an optical signal processing method according to an embodiment of the present application. As shown in fig. 19, the method may include a plurality of steps as follows.

1901, receiving a first optical signal from said first contiguous wavelength division multiplexing device.

1902, a second optical signal to be sent to at least one first optical transmission unit OTU is separated from the first optical signal by the first wavelength division unit, and the second optical signal is directly distributed to the at least one first OTU.

1903, when the wavelength division multiplexing device is connected to the second adjacent wavelength division multiplexing device normally, the first wavelength division unit is controlled to send a third optical signal, except the second optical signal, in the first optical signal to the first multiplexing unit, and the third optical signal is sent to the second adjacent wavelength division multiplexing device through the first multiplexing unit.

1904, when the wavelength division multiplexing device and the second adjacent wavelength division multiplexing device are in a connection failure, control the first wavelength division unit to send a third optical signal, except the second optical signal, of the first optical signal to the second wavelength division unit.

1905, control the second wavelength division unit to separate a fourth optical signal to be sent to the at least one second OTU from the third optical signal, and send the fourth optical signal to the at least one second OTU through the second wavelength division unit.

1906, control the second wavelength division multiplexing unit to send a fifth optical signal, except for the fourth optical signal, of the third optical signal to the second multiplexing unit, and send the fifth optical signal to the first adjacent wavelength division multiplexing device through the second multiplexing unit.

In one possible implementation, the method further includes: an optical signal from at least one second OTU is received. And when the wavelength division multiplexing equipment and the second adjacent wavelength division multiplexing equipment are in connection failure, controlling the first multiplexing unit to send the optical signal from the at least one second OTU to the first adjacent wavelength division multiplexing equipment. Optionally, the sending, by the second multiplexing unit, the fifth optical signal to the second multiplexing unit in step 1906 specifically includes: and multiplexing the fifth optical signal and the optical signal from the at least one second OTU by the second multiplexing unit, and then sending the multiplexed optical signal to the first adjacent wavelength division multiplexing device.

In one possible implementation, the method further includes: an optical signal from at least one first OTU is received. The multiplexing the fifth optical signal and the optical signal from the at least one second OTU by the second multiplexing unit, and then sending the multiplexed signal to the first adjacent wavelength division multiplexing device specifically includes: and combining the fifth optical signal, the optical signal from the at least one first OTU, and the optical signal from the at least one second OTU by the second combining unit, and then sending the combined optical signal to the first adjacent wavelength division multiplexing device.

In a possible implementation manner, controlling the first wavelength division unit to send a third optical signal, except the second optical signal, of the first optical signal to the second wavelength division unit specifically includes: and controlling the first wave-splitting unit to execute optical cross switching, and optically cross connecting a third optical signal except the second optical signal in the first optical signal to an output port connected with the second wave-splitting unit.

The structures of the first wave splitting unit, the second wave splitting unit, the first wave combining unit and the second wave combining unit are as described above, and are not described herein again.

The embodiment of the application also provides a computer readable storage medium. The computer readable storage medium has stored therein instructions, which when executed on a computer or processor, cause the computer or processor to perform some or all of the steps performed by the control component in any of the embodiments of the present application.

Embodiments of the present application also provide a computer program product containing instructions, which when executed on a computer or a processor, causes the computer or the processor to perform some or all of the steps performed by the control component in any of the embodiments of the present application.

In the embodiments of the present application, unless otherwise specified or conflicting with respect to logic, the terms and/or descriptions in different embodiments have consistency and may be mutually cited, and technical features in different embodiments may be combined to form a new embodiment according to their inherent logic relationship.

In the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated object, indicating that there may be three relationships, for example, a and/or B, which may indicate: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b and c may be single or plural. In the description of the text of this application, the character "/" generally indicates that the former and latter associated objects are in an "or" relationship. In the formula of the present application, the character "/" indicates that the preceding and following associated objects are in a "division" relationship. Additionally, in the present application, the word "exemplary" is used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Or it may be appreciated that the term using examples is intended to present concepts in a concrete fashion and not to limit the application.

It is to be understood that the various numerical designations referred to in this application are merely for convenience of description and are not intended to limit the scope of the embodiments of the present application. The sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of the processes should be determined by their functions and inherent logic. The terms "first," "second," and the like, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprises" and "comprising," as well as any variations thereof, are intended to cover a non-exclusive inclusion, such as a list of steps or elements. A method, system, article, or apparatus is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, system, article, or apparatus.

Although the present application has been described in conjunction with specific features and embodiments thereof, it will be evident that various modifications and combinations may be made thereto without departing from the spirit and scope of the application. Accordingly, the specification and figures are merely illustrative of the concepts defined by the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the application.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the scope of the application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.

Claims

1. A wavelength division multiplexing device is characterized in that the wavelength division multiplexing device comprises a first wavelength division unit, a first multiplexing unit, a second wavelength division unit and a second multiplexing unit; wherein:

the input end of the first wave-splitting unit is respectively optically connected with a first adjacent wavelength division multiplexing device and the output end of the second wave-splitting unit, and the output end of the first wave-splitting unit is respectively optically connected with the input end of the first wave-combining unit and the input end of the second wave-splitting unit; the output end of the first wavelength division unit is also in direct optical connection with at least one first optical transmission unit OTU;

the input end of the first wave combining unit is also optically connected with the output end of the second wave combining unit, and the input end of the first wave combining unit is also directly optically connected with at least one second OTU; the output end of the first wave combining unit is optically connected with the second adjacent wavelength division multiplexing equipment and the input end of the second wave combining unit;

the input end of the second wavelength division unit is further optically connected with the second adjacent wavelength division multiplexing equipment, the output end of the second wavelength division unit is further optically connected with the input end of the second wavelength multiplexing unit, and the output end of the second wavelength division unit is further directly optically connected with the at least one second OTU;

the input end of the second wave combining unit is also in direct optical connection with the at least one first OTU; the output end of the second wave combination unit is also optically connected with the first adjacent wavelength division multiplexing equipment;

the first wavelength division multiplexing device is configured to separate a second optical signal and a third optical signal from a received first optical signal, send the second optical signal to the first OTU, and send the third optical signal to the first wavelength multiplexing unit when the wavelength division multiplexing device and the second adjacent wavelength division multiplexing device are connected normally; when the wavelength division multiplexing equipment is in a fault with the second adjacent wavelength division multiplexing equipment, the third optical signal is sent to the second wavelength division unit;

the first wavelength multiplexing unit is configured to send a received fourth optical signal to the second adjacent wavelength division multiplexing device when the wavelength division multiplexing device and the second adjacent wavelength division multiplexing device are connected normally, and send the fourth optical signal to the second wavelength multiplexing unit when the wavelength division multiplexing device and the second adjacent wavelength division multiplexing device are connected in a failure; the fourth optical signal comprises at least an optical signal from the at least one second OTU;

the second wavelength division unit is configured to separate a sixth optical signal and a seventh optical signal from the received fifth optical signal, send the sixth optical signal to the second OTU, send the seventh optical signal to the second wavelength multiplexing unit when the wavelength division multiplexing device and the first adjacent wavelength division multiplexing device are connected normally, and send the seventh optical signal to the first wavelength division unit when the wavelength division multiplexing device and the first adjacent wavelength division multiplexing device are connected in a failure;

the second wavelength multiplexing unit is configured to send the received eighth optical signal to the second adjacent wavelength division multiplexing device when the wavelength division multiplexing device and the first adjacent wavelength division multiplexing device are connected normally, and send the eighth optical signal to the first wavelength multiplexing unit when the wavelength division multiplexing device and the first adjacent wavelength division multiplexing device are connected in a failure; the eighth optical signal comprises at least an optical signal from the at least one first OTU.

2. The wavelength division multiplexing device of claim 1, wherein:

the first wavelength division unit comprises a first input port, a second input port, N +2 output ports including the first output port and the second output port, the second wavelength division unit comprises N +2 output ports including a third input port, a fourth input port, a third output port and a fourth output port, the first multiplexing unit comprises N +2 input ports including a fifth output port, a sixth output port, a fifth input port and a sixth input port, the second multiplexing unit comprises N +2 input ports including a seventh output port, an eighth output port, a seventh input port and an eighth input port, and N is a positive integer;

wherein the first input port is optically connected to the first adjacent wavelength division multiplexing device, the second input port is optically connected to the third output port, and the first output port is optically connected to the fifth input port; the second output port is optically connected to the third input port; the first wavelength division unit comprises N1 output ports except the first output port and the second output port, and N1 first OTUs which are in one-to-one correspondence and are directly optically connected, wherein N1 is smaller than or equal to N;

the sixth input port is optically connected to the seventh output port, N2 input ports of the first multiplexing unit, except for the fifth input port and the sixth input port, are directly optically connected to N2 second OTUs in a one-to-one correspondence manner, the fifth output port is optically connected to the second adjacent wavelength division multiplexing device, and the sixth output port is optically connected to the seventh input port;

the fourth input port is optically connected to the second adjacent wavelength division multiplexing device, and the fourth output port is optically connected to the eighth input port; n2 output ports of the second wavelength division unit, except for the third output port and the fourth output port, are in one-to-one correspondence direct optical connection with N2 second OTUs, where N2 is less than or equal to N;

the eighth output port is optically connected to the first adjacent wavelength division multiplexing device, and the input ports of N1 in the second multiplexing unit, except the seventh input port and the eighth input port, are directly optically connected to the N1 first OTUs in a one-to-one correspondence manner.

3. The wavelength division multiplexing device according to claim 1 or 2, wherein:

the first wavelength division unit comprises a first coupler and a first wavelength selective switch WSS, the second wavelength division unit comprises a second coupler and a second WSS, the first wavelength combination unit comprises a first optical splitter and a third WSS, and the second wavelength combination unit comprises a second optical splitter and a fourth WSS;

the input end of the first coupler is respectively optically connected with the first adjacent wavelength division multiplexing device and the output end of the second WSS, the output end of the first coupler is optically connected with the input end of the first WSS, the output end of the first WSS is respectively optically connected with the input end of the third WSS and the input end of the second coupler, and the output end of the first WSS is also directly optically connected with at least one first OTU;

the input end of the third WSS is further optically connected with the output end of the second optical splitter, the input end of the third WSS is further optically connected with at least one second OTU directly, the output end of the third WSS is optically connected with the input end of the first optical splitter, and the output end of the first optical splitter is respectively optically connected with the second adjacent wavelength division multiplexing device and the fourth WSS;

the input end of the second coupler is further optically connected to a second adjacent wavelength division multiplexing device, the output end of the second coupler is optically connected to the input end of the second WSS, the output end of the second WSS is further optically connected to the fourth WSS, and the output end of the second WSS is further optically connected to the at least one second OTU directly;

the input end of the fourth WSS is further optically connected to at least one first OTU directly, the output end of the fourth WSS is optically connected to the input end of a second optical splitter, and the output end of the second optical splitter is further optically connected to the first adjacent wavelength division multiplexing device.

4. The wavelength division multiplexing device of claim 3, wherein the first WSS and the fourth WSS are deployed on a same single board; the second WSS and the third WSS are deployed on the same single board.

5. The wavelength division multiplexing device according to claim 3 or 4, wherein the first wavelength division unit further comprises a first optical amplifier disposed between the first coupler and a first wavelength selective switch WSS;

the second wave splitting unit further comprises a second optical amplifier, and the second optical amplifier is arranged between the first coupler and the second WSS;

the first wave-combining unit further comprises a third optical amplifier, and the third optical amplifier is arranged between the first optical splitter and the third WSS;

the second multiplexing unit further comprises a fourth optical amplifier, and the fourth optical amplifier is arranged between the second optical splitter and the fourth WSS.

6. The wavelength division multiplexing device according to claim 1 or 2, wherein:

the first wave-splitting unit and the second wave-splitting unit are respectively WSS; the first wave combining unit and the second wave combining unit are respectively WSS.

7. The wavelength division multiplexing device of claim 6, wherein:

the WSS respectively included by the first wave splitting unit and the second wave combining unit are deployed on the same single board, and the WSS respectively included by the second wave splitting unit and the first wave combining unit are deployed on the same single board.

8. The wavelength division multiplexing device according to claim 1 or 2, wherein:

the first wave splitting unit comprises a first optical switch and a first WSS, the second wave splitting unit comprises a second optical switch and a second WSS, the first wave combining unit comprises a third optical switch and a third WSS, and the second wave combining unit comprises a fourth optical switch and a fourth WSS; wherein the content of the first and second substances,

an input end of the first optical switch is optically connected with the first adjacent wavelength division multiplexing device and an output end of the second WSS respectively, an output end of the first optical switch is optically connected with an input end of the first WSS, an output end of the first WSS is optically connected with an input end of the third WSS and an input end of the second optical switch respectively, and an output end of the first WSS is further optically connected with at least one first OTU directly;

the input end of the third WSS is further optically connected to the output end of the fourth optical switch, the input end of the third WSS is further optically connected to at least one second OTU directly, the output end of the third WSS is optically connected to the input end of the third optical switch, and the output end of the first optical splitter is optically connected to the second adjacent wavelength division multiplexing device and the fourth WSS, respectively;

the input end of the second optical switch is further optically connected with a second adjacent wavelength division multiplexing device, the output end of the second optical switch is optically connected with the input end of the second WSS, the output end of the second WSS is further optically connected with the fourth WSS, and the output end of the second WSS is further optically connected with the at least one second OTU directly;

the input end of the fourth WSS is further optically connected to at least one first OTU directly, the output end of the fourth WSS is optically connected to the input end of the fourth optical switch, and the output end of the fourth optical switch is further optically connected to the first adjacent wavelength division multiplexing device.

9. The wavelength division multiplexing device of claim 8, wherein the first wavelength division unit further comprises a first optical amplifier disposed between the first optical switch and a first wavelength selective switch WSS;

the second wavelength division unit further comprises a second optical amplifier, and the second optical amplifier is arranged between the second optical switch and the second WSS;

the first multiplexing unit further comprises a third optical amplifier, and the third optical amplifier is arranged between the third optical switch and the third WSS;

the second multiplexing unit further includes a fourth optical amplifier, and the fourth optical amplifier is disposed between the fourth optical switch and the fourth WSS.

10. The wavelength division multiplexing device of any one of claims 1 to 4 and 6 to 9, wherein the wavelength division multiplexing device further comprises a first optical amplifier, a second optical amplifier, a third optical amplifier, and a fourth optical amplifier;

the first optical amplifier is arranged at the input end of the first wavelength division unit, and the first wavelength division unit is optically connected with the first adjacent wavelength division multiplexing equipment through the first optical amplifier;

the second optical amplifier is disposed at an input end of the second wavelength division multiplexing unit, and the second wavelength division multiplexing unit is optically connected with the second adjacent wavelength division multiplexing equipment through the second optical amplifier;

the third optical amplifier is disposed at the output end of the first multiplexing unit, and the first multiplexing unit is optically connected with the second adjacent wavelength division multiplexing equipment through the third optical amplifier;

the fourth optical amplifier is disposed at an output end of the second multiplexer unit, and the second multiplexer unit is optically connected to the first adjacent wavelength division multiplexing device through the fourth optical amplifier.

11. The wdm apparatus according to any one of claims 1-10, further comprising a controller for controlling the first demultiplexing unit to optically cross the third optical signal to the second demultiplexing unit when the wdm apparatus is failed to connect to the second adjacent wdm apparatus; and controlling the first multiplexing unit to cross the fourth optical signal and the light to the second multiplexing unit.

12. The wdm apparatus according to claim 11, wherein said controller is further configured to control said first demultiplexing unit to optically cross said third optical signal to said first multiplexing unit when said wdm apparatus and said second adjacent wdm apparatus are connected normally; and controlling the first multiplexing unit to optically cross the fourth optical signal to the second adjacent wavelength division multiplexing device.

13. The wavelength division multiplexing device according to any one of claims 1 to 10, further comprising a controller for controlling the second wavelength division unit to optically cross the seventh optical signal to the first wavelength division unit when the wavelength division multiplexing device is failed to connect with the first adjoining wavelength division multiplexing device; and controlling the second multiplexing unit to cross the eighth optical signal and the light to the first multiplexing unit.

14. The wdm apparatus according to claim 13, wherein said controller is further configured to control said second demultiplexing unit to optically cross said seventh optical signal to said second multiplexing unit when said wdm apparatus and said first adjacent wdm apparatus are connected normally; and controlling the second multiplexer unit to optically cross the eighth optical signal to the first adjacent wavelength division multiplexing device.

15. An optical signal processing method is applied to wavelength division multiplexing equipment, and the wavelength division multiplexing equipment comprises a first wavelength division unit, a first multiplexing unit, a second wavelength division unit and a second multiplexing unit; the method comprises the following steps:

receiving a first optical signal from the first contiguous wavelength division multiplexing device;

separating a second optical signal to be sent to at least one first Optical Transmission Unit (OTU) from the first optical signal through the first wavelength division unit, and directly distributing the second optical signal to the at least one first OTU;

when the wavelength division multiplexing equipment and the second adjacent wavelength division multiplexing equipment are normally connected, controlling the first wavelength division unit to send a third optical signal except the second optical signal in the first optical signal to the first wavelength combination unit, and sending the third optical signal to the second adjacent wavelength division multiplexing equipment through the first wavelength combination unit;

when the wavelength division multiplexing equipment is in a fault with the second adjacent wavelength division multiplexing equipment, controlling the first wavelength division unit to send a third optical signal except the second optical signal in the first optical signal to the second wavelength division unit;

controlling the second wavelength division unit to separate a fourth optical signal to be sent to the at least one second OTU from the third optical signal, and sending the fourth optical signal to the at least one second OTU through the second wavelength division unit;

and controlling the second wavelength division multiplexing unit to send a fifth optical signal, except the fourth optical signal, of the third optical signal to the second multiplexing unit, and sending the fifth optical signal to the first adjacent wavelength division multiplexing device through the second multiplexing unit.

16. The method of claim 15, wherein the method further comprises:

receiving an optical signal from at least one second OTU;

when the wavelength division multiplexing equipment and the second adjacent wavelength division multiplexing equipment are in a connection fault, controlling the first multiplexing unit to send the optical signal from the at least one second OTU to the second multiplexing unit;

sending the fifth optical signal to the first adjacent wavelength division multiplexing device through the second multiplexing unit, specifically including:

and multiplexing a fifth optical signal and the optical signal from the at least one second OTU by the second multiplexing unit, and then transmitting the multiplexed signal to the first adjacent wavelength division multiplexing device.

17. The method of claim 16, wherein the method further comprises:

receiving an optical signal from at least one first OTU;

after the fifth optical signal and the optical signal from the at least one second OTU are subjected to multiplexing, the optical signal is sent to the first adjacent wavelength division multiplexing device, which specifically includes:

and multiplexing the fifth optical signal, the optical signal from the at least one first OTU, and the optical signal from the at least one second OTU by the second multiplexing unit, and then sending the multiplexed signal to the first adjacent wavelength division multiplexing device.

18. The method according to any one of claims 15 to 17, wherein the controlling the first wavelength division unit to transmit a third optical signal, except for the second optical signal, of the first optical signal to the second wavelength division unit specifically includes:

and controlling the first wave-splitting unit to execute optical cross switching, and optically cross connecting a third optical signal except the second optical signal in the first optical signal to an output port connected with the second wave-splitting unit.