Wavelength division multiplexing device and optical signal processing method

Abstract

The present application discloses a wavelength division multiplexing device and an optical signal processing method for reducing configuration costs. In the embodiment of the present application, by configuring the add-in circuit and the drop-in circuit of the OTU, for example, the optical path between the output end of the first multiplexing unit and the input end of the second multiplexing unit is used as the add-in circuit of the second OTU. The optical path between the output end of the first demultiplexing unit and the input end of the second demultiplexing unit is used as the drop-in circuit 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 is used as the add-in circuit of the first OTU. The optical path between the output end of the second demultiplexing unit and the input end of the first demultiplexing unit is used as the drop-in circuit of the first OTU. When a fault occurs on the main add-in and add-out paths of the OTU, transmission is carried out through the add-in and add-out circuits. Optical layer protection in the event of a fault can be achieved without configuring the local dimension of the optical layer. Only the add-in and drop-in circuits need to be established, thereby reducing the configuration cost of the wavelength division multiplexing device.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of optical communication technology, and in particular to a wavelength division multiplexing device and an optical signal processing method. Background Art

[0002] Wavelength Division Multiplexing (WDM) systems are used in backbone and metropolitan area network construction, carrying a large number of important communication services. When a network failure occurs, it is particularly important to be able to quickly restore communication services.

[0003] Currently, the service protection methods used in wavelength division multiplexing systems are divided into electrical layer protection and optical layer protection. Electrical layer protection is mainly based on the optical data unit k (ODUk) sub-network connection protection (SNCP) protection method, which requires the configuration of the optical transport unit (OTU) board, which is relatively expensive. Currently, the optical layer protection method generally adopts the rerouting protection method based on the wavelength switched optical network (WSON). The rerouting protection method of WSON generally uses the reconfigurable optical add-drop multiplexer (ROADM) to perform non-directional local dimension upper and lower wavelength layer configuration. The local dimension is generally implemented using a wavelength selective switch or a dual-mode wavelength selective switch combined with a wavelength combiner / demultiplexer board, optical amplifiers, etc., resulting in a high configuration cost. Summary of the Invention

[0004] The embodiments of the present application provide a wavelength division multiplexing device and an optical signal processing method to reduce the equipment configuration cost of optical layer protection.

[0005] In a first aspect, embodiments of the present application provide a wavelength division multiplexing (WDM) device. The WDM device includes a first wavelength division multiplexing (WDM) unit, a first wavelength combination unit, a second wavelength division multiplexing (WDM) unit, and a second wavelength combination unit. The input end of the first wavelength division multiplexing (WDM) unit is optically connected to the output ends of a first adjacent WDM device and a second wavelength division multiplexing (WDM) unit, respectively, and the output end of the first wavelength division multiplexing (WDM) unit is optically connected to the input end of the first wavelength combination unit and the input end of the second wavelength division multiplexing (WDM) unit, respectively. The output end of the first wavelength division multiplexing (WDM) unit is also optically connected to at least one first optical transmission unit (OTU). The input end of the first wavelength combination unit is also optically connected to the output end of the second wavelength combination unit, and the input end of the first wavelength combination unit is also optically connected to at least one second OTU. The output end of the first wavelength combination unit is optically connected to a second adjacent WDM device and an input end of the second wavelength combination unit. The input end of the second wavelength division multiplexing (WDM) unit is also optically connected to a second adjacent WDM device, the output end of the second wavelength division multiplexing (WDM) unit is also optically connected to the input end of the second wavelength combination unit, and the output end of the second wavelength division multiplexing (WDM) unit is also optically connected to at least one second OTU. The input end of the second wavelength combination unit is also optically connected to at least one first OTU. The output end of the second multiplexing unit is also optically connected to the first adjacent wavelength division multiplexing device.

[0006] The first wavelength splitting unit is configured to separate the second and third optical signals from the received first optical signal and then send the second optical signal to the first OTU. When the wavelength division multiplexing device is normally connected to the second adjacent wavelength division multiplexing device, the first wavelength splitting unit sends the third optical signal to the first wavelength combining unit. When the wavelength division multiplexing device and the second adjacent wavelength division multiplexing device are not connected properly, the first wavelength splitting unit sends the third optical signal to the second wavelength splitting unit. The first wavelength combining unit is configured to send the 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 normally connected, and to send the fourth optical signal to the second wavelength combining unit when the wavelength division multiplexing device and the second adjacent wavelength division multiplexing device are not connected properly. The fourth optical signal includes at least one optical signal from at least one second OTU. The second wavelength splitting unit is configured to separate the sixth and seventh optical signals from the received fifth optical signal and send the second sixth optical signal to the second OTU. When the wavelength division multiplexing device is normally connected to the first adjacent wavelength division multiplexing device, the second wavelength splitting unit sends the seventh optical signal to the second wavelength combining unit. When the wavelength division multiplexing device and the first adjacent wavelength division multiplexing device are not connected properly, the second wavelength splitting unit sends the seventh optical signal to the first wavelength splitting unit. The second wavelength combining 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 normally connected, and to send the eighth optical signal to the first wavelength combining unit when the wavelength division multiplexing device and the first adjacent wavelength division multiplexing device are not connected properly. The eighth optical signal includes at least one optical signal from at least one first OTU.

[0007] Through the solution provided in the embodiments of the present application, the first wavelength splitting unit and the second wavelength splitting unit are optically connected, and the first wavelength combining unit and the second wavelength combining unit are also optically connected, forming the add and drop loops for the first and second OTUs. The optical path between the output of the first wavelength combining unit and the input of the second wavelength combining unit can be understood as the add loop of the second OTU. The optical path between the output of the first wavelength splitting unit and the input of the second wavelength splitting unit can be understood as the drop loop of the second OTU. The optical path between the output of the second wavelength combining unit and the input of the first wavelength combining unit can be understood as the add loop of the first OTU. The optical path between the output of the second wavelength splitting unit and the input of the first wavelength splitting unit can be understood as the drop loop of the first OTU. Therefore, when a fault occurs on the main add / drop path of the OTU, transmission is carried out via the add / drop loops. Optical layer protection against faults can be achieved without configuring the local optical layer. Only the add and drop loops need to be established, eliminating the need for additional local-level components such as WSSs. This reduces resources and the configuration cost of wavelength division multiplexing equipment.

[0008] In one possible design, the first wavelength splitting 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 wavelength splitting 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 wavelength combining 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 wavelength combining unit includes N+2 input ports including a seventh output port, an eighth output port, a seventh input port, and an eighth input port, where 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 of the second wavelength splitting unit, the first output port is optically connected to the fifth input port; the second output port is optically connected to the third input port; and the first wavelength splitting unit except the first output port and the second output port has N+2 optical ports. The N1 output ports are directly optically connected to the N1 first OTUs in a one-to-one correspondence, where N1 is less than or equal to N; the sixth input port is optically connected to the seventh output port, and the N2 input ports of the first multiplexing unit, except the fifth input port and the sixth input port, are directly optically connected to the N2 second OTUs in a one-to-one correspondence, 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; the N2 output ports of the second demultiplexing unit, except the third output port and the fourth output port, are directly optically connected to the N2 second OTUs in a one-to-one correspondence, 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 N1 input ports of 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. The above configuration connection between ports realizes the add / drop wave loop and supports the add / drop wave transmission of multiple OTUs, thereby improving the utilization rate of wavelength division multiplexing equipment and further reducing the configuration cost of wavelength division multiplexing equipment.

[0009] In one possible design, the first wavelength splitting unit includes a first coupler and a first wavelength selective switch WSS, the second wavelength splitting unit includes a second coupler and a second WSS, the first wavelength combining unit includes a first optical splitter and a third WSS, and the second wavelength combining unit includes a second optical splitter and a fourth WSS; the input end of the first coupler is optically connected to the output end of the first adjacent wavelength division multiplexing device and the second WSS respectively, the output end of the first coupler is optically connected to the input end of the first WSS, the output end of the first WSS is optically connected to the input end of the third WSS and the input end of the second coupler respectively, and the output end of the first WSS is also directly optically connected to 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 third WSS is optically connected to the output end of the third WSS. The input end of S is also directly optically connected to at least one second OTU, the output end of the third WSS is optically connected to the input end of the first optical splitter, 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 coupler is also optically connected to the 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 also optically connected to the fourth WSS, and the output end of the second WSS is also directly optically connected to at least one second OTU; the input end of the fourth WSS is also directly optically connected to 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 also optically connected to the first adjacent wavelength division multiplexing device. Through the above design, the coupler and WSS are combined to realize the function of the wavelength division multiplexing unit, and the WSS and optical splitter are combined to realize the function of the wavelength division multiplexing unit. Since the cost of the added coupler and optical splitter is relatively low, the configuration cost of the wavelength division multiplexing device can be further reduced.

[0010] In one possible design, the first WSS and the fourth WSS are deployed on the same board; the second WSS and the third WSS are deployed on the same board.

[0011] In one possible design, the first demultiplexing unit further includes a first optical amplifier, which is disposed between the first coupler and the first wavelength selective switch (WSS); the second demultiplexing unit further includes a second optical amplifier, which is disposed between the first coupler and the second WSS; the first combining unit further includes a third optical amplifier, which is disposed between the first optical splitter and the third WSS; and the second combining unit further includes a fourth optical amplifier, which is disposed between the second optical splitter and the fourth WSS. The above design uses optical amplifiers to increase the transmission power of optical signals.

[0012] In one possible design, the first and second wavelength splitting units are each a WSS, and the first and second wavelength combining units are each a WSS. In this design, the WSSs alone implement the functions of the wavelength splitting and combining units, eliminating the need for additional local optical layer configuration and reducing the cost of configuring wavelength division multiplexing equipment.

[0013] In a possible design, the WSSs included in the first demultiplexing unit and the second multiplexing unit are respectively deployed on the same single board, and the WSSs included in the second demultiplexing unit and the first multiplexing unit are respectively deployed on the same single board.

[0014] In a possible design, the first demultiplexing unit and the second multiplexing unit are deployed on the same single board, and the second demultiplexing unit and the first multiplexing unit are deployed on the same single board.

[0015] In one possible design, the first wavelength splitting unit includes a first optical switch and a first WSS, the second wavelength splitting unit includes a second optical switch and a second WSS, the first wavelength combining unit includes a third optical switch and a third WSS, and the second wavelength combining unit includes a fourth optical switch and a fourth WSS; wherein, the input end of the first optical switch is optically connected to the output end of the first adjacent wavelength division multiplexing device and the second WSS respectively, the output end of the first optical switch is optically connected to the input end of the first WSS, the output end of the first WSS is optically connected to the input end of the third WSS and the input end of the second optical switch respectively, and the output end of the first WSS is also directly optically connected to at least one first OTU; the input end of the third WSS is also optically connected to the output end of the fourth optical switch, and the output end of the third WSS is optically connected to the output end of the fourth OTU. The input end is also directly optically connected to at least one second OTU, 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 also optically connected to the second adjacent wavelength division multiplexing device, the output end of the second optical switch is optically connected to the input end of the second WSS, the output end of the second WSS is also optically connected to the fourth WSS, and the output end of the second WSS is also directly optically connected to at least one second OTU. The input end of the fourth WSS is also directly optically connected to 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. Through the above design, the optical switch and WSS are combined to realize the functions of the wavelength division multiplexing unit and the wavelength combination unit. Since the cost of the additional optical switch is relatively low, the configuration cost of the wavelength division multiplexing device is further reduced.

[0016] In one possible design, the first demultiplexing unit further includes a first optical amplifier, which is arranged between the first optical switch and the first wavelength selective switch WSS; the second demultiplexing unit further includes a second optical amplifier, which is arranged between the second optical switch and the second WSS; the first combining unit further includes a third optical amplifier, which is arranged between the third optical switch and the third WSS; the second combining unit further includes a fourth optical amplifier, which is arranged between the fourth optical switch and the fourth WSS.

[0017] 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 deployed at the input end of the first wavelength division multiplexing unit, and the first wavelength division multiplexing unit is optically connected to the first adjacent wavelength division multiplexing device through the first optical amplifier; the second optical amplifier is deployed at the input end of the second wavelength division multiplexing unit, and the second wavelength division multiplexing unit is optically connected to the second adjacent wavelength division multiplexing device through the second optical amplifier; the third optical amplifier is deployed at the output end of the first wavelength combination unit, and the first wavelength combination unit is optically connected to the second adjacent wavelength division multiplexing device through the third optical amplifier; the fourth optical amplifier is deployed at the output end of the second wavelength combination unit, and the second wavelength combination unit is optically connected to the first adjacent wavelength division multiplexing device through the fourth optical amplifier.

[0018] In one possible design, the first optical amplifier, the first wavelength splitting unit, the second wavelength combining unit, and the fourth optical amplifier are deployed on the same board. The second optical amplifier, the second wavelength splitting unit, the first wavelength combining unit, and the third optical amplifier are deployed on the same board.

[0019] In one possible design, the wavelength division multiplexing device further includes a controller configured to, when a connection failure occurs between the wavelength division multiplexing device and a second adjacent wavelength division multiplexing device, control the first wavelength splitting unit to optically cross-link the third optical signal to the second wavelength splitting unit; and control the first wavelength combining unit to optically cross-link the fourth optical signal to the second wavelength combining unit. Optionally, the controller is further configured to, when a connection failure occurs between the wavelength division multiplexing device and the second adjacent wavelength division multiplexing device, control the first wavelength splitting unit to optically cross-link the third optical signal to the first wavelength combining unit; and control the first wavelength combining unit to optically cross-link the fourth optical signal to the second adjacent wavelength division multiplexing device.

[0020] In one possible design, the wavelength division multiplexing device further includes a controller configured to, when a connection failure occurs between the wavelength division multiplexing device and a first adjacent wavelength division multiplexing device, control the second wavelength splitting unit to optically cross-link the seventh optical signal to the first wavelength splitting unit; and control the second wavelength combining unit to optically cross-link the eighth optical signal to the first wavelength combining unit. Optionally, the controller is further configured to, when a connection failure occurs between the wavelength division multiplexing device and the first adjacent wavelength division multiplexing device, control the second wavelength splitting unit to optically cross-link the seventh optical signal to the second wavelength combining unit; and control the second wavelength combining unit to optically cross-link the eighth optical signal to the first adjacent wavelength division multiplexing device.

[0021] In a second aspect, embodiments of the present application provide a method for processing optical signals. A wavelength division multiplexing (WDM) device includes a first wavelength division multiplexing (WDM) unit, a first wavelength combination unit, a second wavelength division multiplexing (WDM) unit, and a second wavelength combination unit. The method includes: receiving a first optical signal from a first adjacent WDM device. Using the first wavelength division multiplexing (WDM) unit, the WDM unit separates a second optical signal to be sent to at least one OTU from the first optical signal, and distributes the second optical signal directly to the at least one first OTU. When the WDM device is properly connected to the second adjacent WDM device, the WDM unit is controlled to send a third optical signal in the first optical signal, excluding the second optical signal, to the first wavelength combination unit, and the first wavelength combination unit sends the third optical signal to the second adjacent WDM device. When the WDM device fails to connect to the second adjacent WDM device, the WDM unit is controlled to send the third optical signal in the first optical signal, excluding the second optical signal, to the second wavelength division multiplexing (WDM) unit. The WDM unit is controlled to separate a fourth optical signal in the third optical signal, excluding the second optical signal, from the third optical signal, and the second wavelength division multiplexing (WDM) unit sends the fourth optical signal to the at least one second OTU. The second demultiplexing unit is controlled to send a fifth optical signal excluding the fourth optical signal in the third optical signal to the second multiplexing unit, and the fifth optical signal is sent to the first adjacent wavelength division multiplexing device through the second multiplexing unit.

[0022] In one possible design, the method further includes: receiving an optical signal from at least one second OTU; and when a connection failure occurs between the wavelength division multiplexing device and the second adjacent wavelength division multiplexing device, 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 via the second multiplexing unit includes: multiplexing the fifth optical signal with the optical signal from the at least one second OTU via the second multiplexing unit, and then sending the result to the first adjacent wavelength division multiplexing device.

[0023] In one possible design, the method further includes: receiving an optical signal from at least one first OTU. After combining the fifth optical signal and the optical signal from at least one second OTU using a second combining unit, the optical signal is sent to a first adjacent wavelength division multiplexing device. Specifically, the method includes: after combining the fifth optical signal, the optical signal from at least one first OTU, and the optical signal from at least one second OTU using the second combining unit, the optical signal is sent to the first adjacent wavelength division multiplexing device.

[0024] In one possible design, controlling the first wave splitting unit to send a third optical signal other than the second optical signal in the first optical signal to the second wave splitting unit specifically includes: controlling the first wave splitting unit to perform optical cross-switching, and optically cross-connecting the third optical signal other than the second optical signal in the first optical signal to an output port connected to the second wave splitting unit.

[0025] The structures of the first demultiplexing unit, the second demultiplexing unit, the first combining unit and the second combining unit can be referred to the related description of the first aspect, which will not be repeated here.

[0026] In a third aspect, embodiments of the present application also provide an optical signal processing method. This method can be applied to a controller in a wavelength division multiplexing device. The wavelength division multiplexing device includes a first wavelength demultiplexing unit, a first wavelength combining unit, a second wavelength demultiplexing unit, and a second wavelength combining unit. The method includes: controlling the first wavelength demultiplexing unit to separate a second optical signal to be sent to at least one OTU from a received first optical signal, and directly distributing the second optical signal to the at least one first OTU. When the wavelength division multiplexing device is properly connected to a second adjacent wavelength division multiplexing device, controlling the first wavelength demultiplexing unit to send a third optical signal in the first optical signal, excluding the second optical signal, to the first wavelength combining unit, and controlling the first wavelength combining unit to send the third optical signal to the second adjacent wavelength division multiplexing device. When the wavelength division multiplexing device fails to connect to the second adjacent wavelength division multiplexing device, controlling the first wavelength demultiplexing unit to send the third optical signal in the first optical signal, excluding the second optical signal, to the second wavelength demultiplexing unit. Controlling the second wavelength demultiplexing unit to separate a fourth optical signal in the third optical signal, excluding the second optical signal, to be sent to at least one second OTU, and controlling the second wavelength demultiplexing unit to send the fourth optical signal to the at least one second OTU. The second wavelength splitting unit is controlled to send a fifth optical signal excluding the fourth optical signal in the third optical signal to the second wavelength combining unit, and the second wavelength combining unit is controlled to send the fifth optical signal to the first adjacent wavelength division multiplexing device.

[0027] In one possible design, the method further includes: when a connection failure occurs between the wavelength division multiplexing device and a second adjacent wavelength division multiplexing device, controlling the first multiplexing unit to send an optical signal from at least one second OTU to the second multiplexing unit. Controlling the second multiplexing unit to send the fifth optical signal to the first adjacent wavelength division multiplexing device includes: controlling the second multiplexing unit to multiplex the fifth optical signal with an optical signal from at least one second OTU and then sending the resultant optical signal to the first adjacent wavelength division multiplexing device.

[0028] In one possible design, the method also includes: controlling the second combining unit to combine the fifth optical signal and the optical signal from at least one second OTU, and then sending it to the first adjacent wavelength division multiplexing device, specifically including: controlling the second combining unit to combine the fifth optical signal, the optical signal from at least one first OTU, and the optical signal from at least one second OTU, and then sending it to the first adjacent wavelength division multiplexing device.

[0029] In one possible design, controlling the first wave splitting unit to send a third optical signal other than the second optical signal in the first optical signal to the second wave splitting unit specifically includes: controlling the first wave splitting unit to perform optical cross-switching, and optically cross-connecting the third optical signal other than the second optical signal in the first optical signal to an output port connected to the second wave splitting unit.

[0030] In a fourth aspect, embodiments of the present application provide a computer-readable storage medium storing a software program that, when read and executed by one or more processors, can implement any of the methods provided in the third aspect.

[0031] In a fifth aspect, an embodiment of the present application provides a computer program product comprising instructions. When the computer program product is run on a computer, the computer is caused to execute any one of the methods provided in the third aspect.

[0032] The beneficial effects of the second to fifth aspects mentioned above can be found in the relevant description of the first aspect and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of the architecture of a directionless ROADM;

[0034] Figure 2 This is a schematic diagram of the structure of a ring metropolitan area network;

[0035] Figure 3A This is a schematic structural diagram of a wavelength division multiplexing device in an embodiment of the present application;

[0036] Figure 3B This is a structural diagram of another wavelength division multiplexing device in an embodiment of the present application;

[0037] Figure 4 This is a schematic diagram of the deployment of wavelength division multiplexing equipment in an embodiment of the present application;

[0038] Figure 5 This is a schematic diagram of a signal processing method of a wavelength division multiplexing device when the A-link and the B-link are normal in an embodiment of the present application;

[0039] Figure 6 This is a schematic diagram of a signal processing method of a wavelength division multiplexing device when a B-direction link fails in an embodiment of the present application;

[0040] Figure 7 This is a schematic diagram of a signal processing method of a wavelength division multiplexing device when a failure occurs in the A-direction link in an embodiment of the present application;

[0041] Figure 8 This is a schematic structural diagram of another wavelength division multiplexing device in an embodiment of the present application;

[0042] Figure 9 A schematic diagram of the structure of a wavelength division multiplexing device provided in Example 1 of this application;

[0043] Figure 10 A schematic structural diagram of another wavelength division multiplexing device provided in Example 1 of this application;

[0044] Figure 11 A schematic structural diagram of another wavelength division multiplexing device provided in Example 1 of this application;

[0045] Figure 12 A schematic diagram showing the connection relationship between the various ports in the wavelength division multiplexing device provided in Example 1 of this application;

[0046] Figure 13 A schematic structural diagram of a wavelength division multiplexing device provided in Example 2 of this application;

[0047] Figure 14 A schematic structural diagram of another wavelength division multiplexing device provided in Example 2 of this application;

[0048] Figure 15 A schematic structural diagram of a wavelength division multiplexing device provided in Example 3 of this application;

[0049] Figure 16 A schematic structural diagram of another wavelength division multiplexing device provided in Example 3 of this application;

[0050] Figure 17 A schematic structural diagram of another wavelength division multiplexing device provided in Example 3 of this application;

[0051] Figure 18 A schematic diagram showing the connection relationship between the various ports in the wavelength division multiplexing device provided in Example 3 of this application;

[0052] Figure 19 This is a flow chart of an optical signal processing method in an embodiment of the present application. DETAILED DESCRIPTION

[0053] The present application will be described in further detail below with reference to the accompanying drawings.

[0054] Wavelength division multiplexing systems can use optical layer service protection. Optical layer protection can use WSON rerouting protection. WSON rerouting protection can use unidirectional ROADM deployment. Figure 1 Figure 1 is a schematic diagram of a non-directional ROADM architecture. Figure 1As shown, the directionless ROADM includes two 1*N WSS boards, WSS board 1 and WSS board 2, which are used to implement wavelength scheduling between different dimensions. At least one 1*N WSS board 3 and an add / drop multiplexer (ADM) are required in the local optical layer dimension to connect the optical transport unit (OTU) board. In the following description, the OTU board will be referred to as an OTU. The add / drop multiplexer can be a wavelength-free (colorless) add / drop multiplexer built on WSS, or a wavelength-based (colored) add / drop multiplexer built on arrayed waveguide grating (AWG). The ROADM site primarily uses the WSS boards and add / drop multiplexers in the local optical layer dimension to perform local add / drop multiplexing based on wavelength and implement line direction scheduling. The 1*N WSS board 3 in the local optical layer dimension is used to connect WSS boards in different directional dimensions. The WSS board can be composed of two 1*N WSS modules or one 1*N WSS module and one 1*N optical splitter.

[0055] Below is Figure 1 The signal flow is explained using the example of adding and dropping wavelength λ1 in direction 1. In the drop direction, the optical signal of wavelength λ1 enters the optical receiving module (such as a 1xN WSS module or a splitter module) of WSS board 1 via the optical cable in direction 1. The optical signal is wavelength-selected by the optical receiving module and then sent from the splitter port (such as the DM port) of WSS board 1 in direction 1 to the multiplexing port (such as the AM port) of the optical receiving module (WSS module) of WSS board 3 in the local optical layer. The signal then flows to the drop / de-split unit and finally reaches the receiving end of OTU2. In the add-wave direction, the optical signal of wavelength λ1 emitted by OTU 2 is combined by the add-wave combining unit (WSS board or AWG board) in the local dimension of the optical layer, and enters the add-wave unit (such as WSS module or Splitter module) of WSS board 3 in the local dimension of the optical layer. Then, it is transmitted from the demultiplexing port (DM port) of WSS board 3 in the local dimension of the optical layer to the wavelength selection unit (WSS module) of WSS board 1 in direction 1. After wavelength cross-linking by the WSS module, it is input into the optical cable in direction 1.

[0056] Directionless ROADM sites require local configuration of the add / drop wavelength layer. This configuration is implemented using WSS boards and add / drop wavelength splitter boards, resulting in high configuration costs.

[0057] Embodiments of the present application provide a wavelength division multiplexing (WDM) device and optical signal processing method for reducing the configuration cost of a WDM system. The WDM device and optical signal processing method provided in embodiments of the present application can be applied to WDM systems. WDM systems can be applied to backbone networks, metropolitan area networks, and other networks.

[0058] As an example, let's take the application of wavelength division multiplexing equipment in a metropolitan area network. Take a ring metropolitan area network as an example. The ring structure used by the ring metropolitan area network can be called a convergence ring. Figure 2 The convergence ring includes at least one convergence node and multiple integrated service access (central office, CO) nodes. The convergence ring adopts a bidirectional deployment mode. Figure 2 In the example, there are two aggregation nodes, namely aggregation node A and aggregation node B. For example, there are four CO nodes, namely CO1, CO2, CO3, and CO4. The two aggregation nodes and the four CO nodes are connected by optical fibers. The two aggregation nodes are used to undertake the business data of the COs and can also play a role in load sharing between the two aggregation nodes. When any CO node on the aggregation ring fails, the other CO nodes need to adjust the transmission direction of the optical signal to quickly restore the wavelength connection from the CO node to the two aggregation nodes to avoid transmission interruption or congestion of business data. In order to quickly restore the wavelength connection from the CO node to the two aggregation nodes, the optical layer WSON method can be used.

[0059] In some embodiments, the CO node may use Figure 1 The ROADM structure shown in the figure. However, the use of a non-directional ROADM structure requires configuration of the local dimension of the optical layer, resulting in high configuration costs. This application provides another wavelength division multiplexing device that can be applied to the CO node, which does not require configuration of the local dimension of the optical layer, thereby saving optical layer configuration costs.

[0060] Figure 3A This is a schematic diagram of the structure of a wavelength division multiplexing device in an embodiment of the present application. Figure 3AAs shown, the wavelength division multiplexing device includes a first wavelength demultiplexing unit 310, a first wavelength combining unit 320, a second wavelength demultiplexing unit 330, and a second wavelength combining unit 340. The first wavelength demultiplexing unit 310 is optically connected to the first wavelength combining unit 320 and the second wavelength demultiplexing unit 330. The first wavelength combining unit 320 is also optically connected to the second wavelength combining unit 340. The second wavelength demultiplexing unit 330 is also optically connected to the second wavelength combining unit 340. The input end of the first wavelength demultiplexing unit 310 is optically connected to the output end of the second wavelength demultiplexing unit 330, and the output end of the first wavelength demultiplexing unit 310 is optically connected to the input end of the first wavelength combining unit 320 and the input end of the second wavelength demultiplexing unit 330, respectively. The input end of the first wavelength combining unit 320 is also optically connected to the output end of the second wavelength combining unit 340, and the output end of the first wavelength combining unit 320 is optically connected to the input end of the second wavelength combining unit 340. The output end of the second wavelength demultiplexing unit 330 is also optically connected to the input end of the second wavelength combining unit 340. The output end 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 demultiplexing unit can also be called a drop unit, which is used to perform the distribution of the drop signal, and the multiplexing unit can also be called an add unit, which is used to perform the merging of the add signal. The first demultiplexing unit 310 and the second multiplexing unit 340 are combined to perform up and down multiplexing and demultiplexing of the connected OTUs. The first multiplexing unit 320 and the second demultiplexing unit 330 are combined to perform up and down multiplexing and demultiplexing of the connected OTUs. For ease of distinction, the OTU optically connected to the first demultiplexing unit 310 and the second multiplexing unit 340 is referred to as the first OTU. The OTU optically connected to the first multiplexing unit 320 and the second demultiplexing unit 330 is referred to as the second OTU.

[0061] In some embodiments, the first demultiplexer unit 310 and the second multiplexer unit 340 can be deployed on the same board. The first multiplexer unit 320 and the second demultiplexer unit 340 can also be deployed on the same board. When the demultiplexer unit and the multiplexer unit are deployed on the same board, the board can be referred to as a multiplexer / demultiplexer, or a multiplexer / demultiplexer board. Other terms may also be used, and are not specifically limited in the embodiments of the present application. Figure 3B Shown is a structural schematic diagram of another wavelength division multiplexing device in an embodiment of the present application. Figure 3B In the figure, the board on which the first demultiplexing unit 310 and the second multiplexing unit 340 are deployed is referred to as board 1 , and the board on which the first multiplexing unit 320 and the second demultiplexing unit 340 are deployed is referred to as board 2 .

[0062] In some embodiments, the first demultiplexing unit 310, the second multiplexing unit 340, the first multiplexing unit 320, and the second demultiplexing unit 340 may also be deployed separately. The demultiplexing unit may also be called a demultiplexer or a demultiplexing board, or other names may be used, which are not specifically limited in the embodiments of the present application.

[0063] Figure 4FIG. 1 is a schematic diagram of the deployment of wavelength division multiplexing equipment in an embodiment of the present application. Figure 4 As shown, the output end of the first wavelength division multiplexing unit 310 is also directly optically connected to at least one first OTU. The input end of the second wavelength division multiplexing unit 340 is also directly optically connected to at least one first OTU. The input end of the first wavelength division multiplexing unit 320 is also directly optically connected to at least one second OTU. The output end of the second wavelength division multiplexing unit 330 is also directly optically connected to at least one second OTU. The number of first OTUs supported by the wavelength division multiplexing device is related to the number of ports included in the output end of the first wavelength division multiplexing unit 310 and the number of ports included in the input end of the second wavelength division multiplexing unit 340. Exemplarily, the number of first OTUs connected by the wavelength division multiplexing device is less than or equal to the minimum of the number of ports included in the output end of the first wavelength division multiplexing unit 310 and the number of ports included in the input end of the second wavelength division multiplexing unit 340. The number of second OTUs supported by the wavelength division multiplexing device is related to 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 division multiplexing unit 320. Exemplarily, the number of second OTUs connected to 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 demultiplexing unit 330 and the number of ports included in the input end of the first multiplexing unit 320.

[0064] 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 through optical fibers. For ease of description, the two adjacent wavelength division multiplexing devices are referred to as a first adjacent wavelength division multiplexing device and a second adjacent wavelength division multiplexing device, respectively. Figure 4 As shown. The input end of the first wavelength splitter unit 310 is also optically connected to the first adjacent wavelength division multiplexing device, and the output end of the first wavelength multiplexing unit 320 is also optically connected to the second adjacent wavelength division multiplexing device. The input end of the second wavelength splitter unit 330 is also optically connected to the second adjacent wavelength division multiplexing device, and the output end of the second wavelength splitter unit 330 is also optically connected to the first adjacent wavelength division multiplexing device.

[0065] In one possible implementation, the wavelength division multiplexing device may further include a controller 350, which is used to control the first wavelength division multiplexing unit 310, the second wavelength division multiplexing unit 330, the first wavelength combining unit 320 and the second wavelength combining unit 340 on the wavelength division multiplexing device. The specific control method will be described in detail later and will not be repeated here.

[0066] For ease of description, the direction in which a WDM device connects to a first adjacent WDM device is referred to as direction A, and the link between the WDM device and the first adjacent WDM device is referred to as the A-link. The direction in which a WDM device connects to a second adjacent WDM device is referred to as direction B, and the link between the WDM device and the second adjacent WDM device is referred to as the B-link.

[0067] Figure 5 This is a schematic diagram of the signal processing method of the wavelength division multiplexing device when the A-link and B-link are normal in the embodiment of the present application. Figure 5 The signal processing method when both the A-link and the B-link are normal is described.

[0068] When both the A-link and the B-link are normal, the signal flow in the wavelength division multiplexing device is through Figure 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 demultiplexing 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.

[0069] It should be noted that the first demultiplexing unit 310 can separate the second optical signal to be sent to each first OTU from the first optical signal based on the wavelength of each first OTU and perform the sending operation. The third optical signal can be understood as an optical signal from the first optical signal other than the second optical signal of at least one first OTU. For example, if the first optical signal includes optical signals to be sent to three first OTUs, the optical signals other than the optical signals of these three first OTUs in the first optical signal are the third optical signals. The first demultiplexing unit 310 sends the third optical signal to the first multiplexing unit 320, which then transmits it to the second adjacent wavelength division multiplexing device. In some embodiments, one or more second OTUs have optical signals to be sent. For ease of distinction, the optical signals to be sent by one or more second OTUs are collectively referred to as fourth optical signals. One or more second OTUs each send the fourth optical signal to be sent to the first multiplexing unit 320. The first multiplexing unit 320 can combine the fourth optical signal with the third optical signal and transmit the combined signal to the second adjacent wavelength division multiplexing device.

[0070] The second demultiplexing unit 330 separates the sixth optical signal and the seventh optical signal to be sent to at least one second OTU from the received fifth optical signal. When both the A-link and the B-link are normal, the fifth optical signal is an optical signal received from the second adjacent wavelength division multiplexing device.

[0071] It should be noted that the second demultiplexing unit 330 can separate the sixth optical signal to be sent to each second OTU from the fifth optical signal based on the wavelength of each second OTU and perform the sending operation. The seventh optical signal can be understood as the optical signal in the fifth optical signal other than the sixth optical signal of at least one second OTU. For example, if the fifth optical signal includes optical signals to be sent to two second OTUs, the optical signals in the fifth optical signal other than the optical signals of the two second OTUs are the seventh optical signal. The second demultiplexing unit 330 sends the seventh optical signal to the second multiplexing unit 340, which then sends it to the first adjacent wavelength division multiplexing device.

[0072] In some embodiments, one or more first OTUs have optical signals to be transmitted. To facilitate differentiation, the optical signals of one or more second OTUs are collectively referred to as eighth optical signals. One or more first OTUs each send the eighth optical signals to be transmitted to the second multiplexing unit 340. The second multiplexing unit 340 can combine the eighth optical signal with the seventh optical signal and transmit the combined signals to the first adjacent wavelength division multiplexing device.

[0073] In some embodiments, when both the A-link and the B-link are normal, the controller can control the first wavelength splitting unit 310 to forward the third optical signal to the first wavelength combining unit 320. Furthermore, the controller can control the first wavelength combining unit 320 to forward the fourth optical signal to the second adjacent wavelength division multiplexing device. Furthermore, the controller can control the second wavelength splitting unit 330 to forward the seventh optical signal to the second wavelength combining unit 340. Furthermore, the controller can control the second wavelength combining unit 340 to forward the eighth optical signal to the first adjacent wavelength division multiplexing device.

[0074] Figure 6 This is a schematic diagram of the signal processing method of the wavelength division multiplexing device when a failure occurs in the B-direction link in the embodiment of the present application. Figure 6 The following describes how to handle signals when a failure occurs on the B-link.

[0075] When the B-direction link fails, the optical signal to be sent to the second adjacent WDM device is sent to the first adjacent WDM device via the second demultiplexing unit 330 and the second multiplexing unit 340. When a ring network is used, the optical signal forwarded in the B-direction is switched to the A-direction for forwarding to the corresponding OTU or network side.

[0076] After separating the third optical signal from the received first optical signal, the first wavelength splitting unit 310 sends the third optical signal to the second wavelength splitting unit 330. In some embodiments, when a B-link failure occurs, the controller controls the first wavelength splitting unit 310 to optically cross-link the third optical signal to the second wavelength splitting unit 330, and controls the first wavelength combining unit 320 to optically cross-link the fourth optical signal to the second wavelength combining unit 340. The second wavelength splitting unit 330 can perform wavelength splitting operations to separate the optical signal required by the second OTU from the third optical signal. In the embodiments of the present application, the second wavelength splitting unit 330 can perform wavelength splitting operations based on the wavelength of the second OTU. It should be noted that when a B-link failure occurs, the second wavelength splitting unit 330 will no longer directly receive optical signals from the second adjacent wavelength division multiplexing device. When a B-link failure occurs, the second wavelength splitting unit 330 will only receive optical signals from the first wavelength splitting unit 310. For example, the optical signal separated from the third optical signal to be sent to the second OTU is referred to as optical signal 9. Optical signal 9 is then sent to the second OTU. The optical signals in the third optical signal other than optical signal 9 are referred to as optical signals 10. Optical signal 10 is sent to the second multiplexing unit 340. When there are no optical signals to be sent on the first OTU, the second multiplexing unit 340 can send optical signal 10 to the first adjacent wavelength division multiplexing device. When there are optical signals to be sent on the first OTU, the second multiplexing unit 340 directly receives the optical signal to be sent by the first OTU from the first OTU. For ease of distinction, the optical signal to be sent by the first OTU is referred to as the eighth optical signal. Of course, the first OTU may include multiple optical signals, and the number of first OTUs that need to send optical signals at different times may be different. The number of first OTUs that need to send optical signals at different times may also be different. After receiving the eighth optical signal, the second multiplexing unit 340 can combine optical signal 10 with the eighth optical signal and send the combined signals to the first adjacent wavelength division multiplexing device.

[0077] In some embodiments, when the B-direction link fails, the first multiplexing unit 320 will not receive optical signals from the first demultiplexing unit 310. If an optical signal needs to be transmitted on the second OTU, the first multiplexing unit 320 can directly receive the optical signal from the second OTU. For ease of description, the optical signal to be transmitted on the second OTU is referred to herein as the fourth optical signal. The first multiplexing unit 320 transmits this fourth optical signal to the second multiplexing unit 340. The second multiplexing unit 340 can then multiplex the fourth optical signal, the eighth optical signal, and the optical signal 10 and transmit them to the first adjacent wavelength division multiplexing device.

[0078] Figure 7 This is a schematic diagram of the signal processing method of the wavelength division multiplexing device when the A-direction link fails in the embodiment of the present application. Figure 7The following describes how to handle signals when a failure occurs on the A-link.

[0079] When a link in direction A fails, the optical signal 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 splitting unit 310 and the first wavelength combining unit 320. When a ring network is used, the optical signal forwarded in direction A is switched to direction B for forwarding to the corresponding OTU or network side.

[0080] The second demultiplexer 330 separates the sixth optical signal and the 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. Due to a failure in the A-direction link, the second demultiplexer 330 does not send the seventh optical signal to the second combining unit 340, but instead sends the seventh optical signal to the first demultiplexer 310. In some embodiments, when a failure occurs in the A-direction link, the controller controls the second demultiplexer 330 to optically cross the seventh optical signal to the first demultiplexer 310; and controls the second combining unit 340 to optically cross the eighth optical signal to the first combining unit 320. The first demultiplexer 310 can perform a demultiplexing 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 demultiplexing operation, the first demultiplexer 310 can perform the separation operation based on the wavelength of the second OTU. It should be noted that when the A-link fails, the first wavelength splitter unit 310 will no longer directly receive optical signals from the first adjacent wavelength division multiplexing device. Instead, the first wavelength splitter unit 310 will receive optical signals from the first wavelength splitter unit 310. For example, the optical signal separated from the seventh optical signal to be sent to the second OTU is called optical signal 11. This optical signal 11 is sent to the second OTU. The optical signals in the seventh optical signal other than optical signal 11 are called optical signal 12. Optical signal 12 is sent to the first wavelength multiplexing unit 320. If there are no optical signals to be sent on the second OTU, the first wavelength multiplexing unit 320 can send optical signal 11 to the second adjacent wavelength division multiplexing device. If there are optical signals to be sent on the second OTU, the first wavelength multiplexing unit 320 directly receives the optical signal to be sent by the second OTU from the second OTU. For ease of distinction, the optical signal to be sent by the second OTU is called the fourth optical signal. Of course, there may be multiple second OTUs directly connected to the wavelength division multiplexing device, and different second OTUs may need to send optical signals at different times. The number of second OTUs that need to send 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 with the fourth optical signal and send the combined signal to the second adjacent wavelength division multiplexing device.

[0081] In some embodiments, when the A-link fails, the second multiplexing unit 340 does not receive optical signals from the second demultiplexing unit 330. If an optical signal to be transmitted exists on the first OTU, the second multiplexing unit 340 can directly receive the optical signal to be transmitted from the first OTU. For ease of description, the optical signal to be transmitted on the first OTU is referred to herein as the eighth optical signal. The second multiplexing unit 340 transmits this eighth optical signal to the first multiplexing unit 320. The first multiplexing unit 320 can then multiplex the eighth optical signal, the fourth optical signal, and the optical signal 12, and transmit the combined optical signals to the second adjacent wavelength division multiplexing device.

[0082] In the solution provided by the above-described embodiment of the present application, the second OTU's add path combines the local second OTU's optical signal onto the main optical path through the first multiplexing unit 320. The drop path drops the corresponding wavelength optical signal to the local second OTU's drop port through the second demultiplexing unit 330. The first OTU's add path combines the local first OTU's optical signal onto the main optical path through the second multiplexing unit 340. The drop path drops the corresponding wavelength optical signal to the local first OTU's drop port through the first demultiplexing unit 310. The optical path between the output of the first multiplexing unit 320 and the input of the second multiplexing unit 340 can be understood as the second OTU's add path. If a fault occurs in the connection path between the first multiplexing unit 320 and the second adjacent wavelength division multiplexing device, i.e., a B-direction link fault, such as a cable fault, the first multiplexing unit 320 combines the local second OTU's optical signal onto the A-direction optical path via the add path. The optical path between the output of the first demultiplexing unit 310 and the input of the second demultiplexing unit 330 can be understood as the second OTU's drop path. In the event of a B-direction link failure, the second OTU's downlink optical signal is received by the first demultiplexing unit 310 and then optically cross-linked to the second demultiplexing unit 330. The second demultiplexing unit 330 separates the optical signal of the local OTU and sends it directly to the local second OTU. Similarly, the optical path between the output of the second multiplexing unit 340 and the input of the first multiplexing unit 320 can be understood as the uplink circuit of the first OTU. In the event of an A-direction link failure, such as a cable failure, the second multiplexing unit 340 combines the optical signal of the local first OTU via the uplink circuit and onto the B-direction optical path. The optical path between the output of the second demultiplexing unit 330 and the input of the first demultiplexing unit 310 can be understood as the downlink circuit of the first OTU. In the event of an A-direction link failure, the first OTU's downlink optical signal is received by the second demultiplexing unit 330 and then optically cross-linked to the first demultiplexing unit 310. The first demultiplexing unit 310 separates the optical signal of the local first OTU and sends it directly to the local first OTU. This application can achieve optical layer protection in the event of a fault without configuring the local dimension of the optical layer. It only requires the establishment of an upper wave loop and a lower wave loop. There is no need to add additional local dimension WSS and other devices, which can reduce resources and reduce the configuration cost of wavelength division multiplexing equipment.

[0083] The following describes the structure of each component in the wavelength division multiplexing device. For the sake of convenience, the numbers of each component are not given as examples.

[0084] Figure 8 FIG. 1 is a structural diagram of another wavelength division multiplexing device in an embodiment of the present application. Figure 8 As shown, 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 combining 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 combining unit includes N+2 input ports, including a seventh output port, an eighth output port, a seventh input port, and an eighth input port, where N is a positive integer.

[0085] The first input port of the first wavelength splitter unit is optically connected to the first adjacent wavelength division multiplexing device. The second input port of the first wavelength splitter unit is optically connected to the third output port of the second wavelength splitter unit. The first output port of the first wavelength splitter unit is optically connected to the fifth input port of the first wavelength combining unit. The second output port of the first wavelength splitter unit is optically connected to the third input port of the second wavelength splitter unit. N1 output ports of the first wavelength splitter unit, excluding the first output port and the second output port, are directly optically connected to N1 first OTUs in a one-to-one correspondence, where N1 is less than or equal to N.

[0086] The sixth input port of the first multiplexing unit is optically connected to the seventh output port of the second multiplexing unit. The N input ports of the first multiplexing unit, excluding the fifth and sixth input ports, are directly optically connected to the N second OTUs in a one-to-one correspondence. The fifth output port of the first multiplexing unit is optically connected to the second adjacent wavelength division multiplexing device, and the sixth output port is optically connected to the seventh input port of the second multiplexing unit.

[0087] The fourth input port of the second wavelength splitting unit is optically connected to the second adjacent wavelength division multiplexing device. The fourth output port of the second wavelength splitting unit is optically connected to the eighth input port of the second wavelength combining unit. N2 output ports of the second wavelength splitting unit, excluding the third and fourth output ports, are directly optically connected to N2 second OTUs in a one-to-one correspondence, where N2 is less than or equal to N. The eighth output port of the second wavelength combining unit is optically connected to the first adjacent wavelength division multiplexing device, and N1 input ports of the second wavelength combining unit, excluding the seventh and eighth input ports, are directly optically connected to N1 first OTUs in a one-to-one correspondence.

[0088] The wave splitting unit and wave combining unit involved in the present application can adopt the structure shown in any of the following implementation methods. In the first possible implementation method, the wave splitting unit includes a coupler and a WSS. The wave combining unit includes an optical splitter and a WSS. In the second possible implementation method, the wave splitting unit includes a WSS. The wave combining unit includes a WSS. In the third possible implementation method, the wave splitting unit includes an optical switch and a WSS. The wave combining unit includes an optical switch and a WSS. The above three possible implementation methods are described below in conjunction with the accompanying drawings.

[0089] Example 1, combined with Figures 9-12 The structure of the wavelength division multiplexing device is described when the first possible implementation method is used for the structures of the wavelength division multiplexing unit and the wavelength combination unit. The wavelength division unit includes a coupler and a WSS, and the wavelength combination unit includes an optical splitter and a WSS. For ease of distinction, the coupler included in the first wavelength division unit is referred to as the first coupler, and the coupler included in the second wavelength division unit is referred to as the second coupler. The optical splitter included in the first wavelength combination unit is referred to as the first optical splitter, and the optical splitter included in the second wavelength combination unit is referred to as the second optical splitter. The WSSs included in the first to fourth wavelength division units are referred to as the first to fourth WSSs, respectively.

[0090] Figure 9 This is a schematic diagram of the structure of the wavelength division multiplexing device provided in Example 1 of this application. Figure 9 As shown, the input end of the first coupler is optically connected to the output end of the first adjacent wavelength division multiplexing device and the second WSS, respectively. The output end of the first coupler is optically connected to the input end of the first WSS. The output end of the first WSS is optically connected to the input end of the third WSS and the input end of the second coupler, respectively. The output end of the first WSS is also directly optically connected to 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 directly optically connected to at least one second OTU. The output end of the third WSS is optically connected to the input end 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 end of the second coupler is also optically connected to the second adjacent wavelength division multiplexing device. The output end of the second coupler is optically connected to the input end of the second WSS, and the output end of the second WSS is also optically connected to the fourth WSS. The output end of the second WSS is also directly optically connected to at least one second OTU. The input end of the fourth WSS is also directly optically connected to 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 also optically connected to the first adjacent wavelength division multiplexing device.

[0091] In a possible implementation, the wavelength division multiplexing device further includes at least four optical amplifiers, namely a first optical amplifier, a second optical amplifier, a third optical amplifier, and a fourth optical amplifier.

[0092] Figure 10This is a schematic diagram of the structure of another wavelength division multiplexing device provided in Example 1 of this application. Figure 10 As shown, the first optical amplifier is arranged 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; and the fourth optical amplifier is arranged between the second optical splitter and the fourth WSS. The amplifiers described above are used to adjust the power of the input signal. For example, the first optical amplifier is deployed in the first demultiplexing unit, the second optical amplifier is deployed in the first combining unit, the third optical amplifier is deployed in the second demultiplexing unit, and the fourth optical amplifier is deployed in the second combining unit. In some embodiments, the first WSS and the fourth WSS can be deployed on the same board or on different boards. The second WSS and the third WSS can be deployed on the same board or on different 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 deployed 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 deployed on the same board.

[0093] Figure 10 This is a schematic diagram of the structure of another wavelength division multiplexing device provided in Example 1 of this application. Figure 11 As shown, a first optical amplifier is deployed at the input end of the first wavelength splitting unit, and the first coupler of the first wavelength splitting unit is optically connected to the first adjacent wavelength division multiplexing device via the first optical amplifier. A third optical amplifier is deployed at the output end of the first wavelength combining unit, and the first optical splitter of the first wavelength combining unit is optically connected to the second adjacent wavelength division multiplexing device via the second optical amplifier. A second optical amplifier is deployed at the input end of the second wavelength splitting unit, and the second coupler of the second wavelength splitting unit is optically connected to the second adjacent wavelength division multiplexing device via the second optical amplifier. A fourth optical amplifier is deployed at the output end of the second wavelength combining unit, and the second optical splitter of the second wavelength combining unit is optically connected to the first adjacent wavelength division multiplexing device via the fourth optical amplifier.

[0094] Figure 12 This is a schematic diagram of the connection relationship between the various ports in the wavelength division multiplexing device provided in Example 1 of this application. Figure 12 Zhongcong Figure 8 The port perspective described here describes the connection relationship between each port in the wavelength division multiplexing device. Figure 12As shown, the input end of the first coupler includes a first input port and a second input port. The first WSS can be a 1*(N+2) WSS. 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 N other output ports for connecting to OTUs. The output port of the first coupler is optically connected to the input port of the first WSS. The second demultiplexing unit includes a second coupler and a second WSS, and the second coupler includes a third input port and a fourth input port. The second WSS can be a 1*(N+2) WSS. 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 N other output ports for connecting to OTUs. The output port of the second coupler is optically connected to the input port of the second WSS. The first combining unit includes a first optical splitter and a third WSS, and the first optical splitter includes a fifth output port and a sixth output port. The third WSS can be a (N+2)*1 WSS. The third WSS includes N+2 input ports and one output port. The N+2 input ports include the fifth and sixth input ports, as well as N other input ports for connecting to OTUs. The input port of the first optical splitter is optically connected to the output port of the third WSS. The second multiplexing unit includes a second optical splitter and a fourth WSS, and the second optical splitter includes a seventh and eighth output ports. The fourth WSS can use an (N+2)*1 WSS. The fourth WSS includes N+2 input ports and one output port. The N+2 input ports include the seventh and eighth input ports, as well as N other input ports for connecting to OTUs. The input port of the second optical splitter is optically connected to the output port of the fourth WSS.

[0095] As an example, let's take the wavelength of the first OTU as λa and the wavelength of the second OTU as λb. On the second OTU's upstream path, the local second OTU's upstream optical signal is combined into the B-direction main optical path through the third WSS's multiplexing port (input port). On the second OTU's downstream path, the corresponding wavelength optical signal is dropped to the local second OTU's downstream port through the second WSS's splitting port (output port). On the first OTU's upstream path, the local first OTU's upstream optical signal is combined into the A-direction main optical path through the fourth WSS's multiplexing port (input port). On the first OTU's downstream path, the corresponding wavelength optical signal is dropped to the local first OTU's downstream port through the first WSS's splitting port (output port).

[0096] For the B-direction link, during normal operation, the third WSS combines the pass-through wavelength (i.e., the optical signal from the first splitter) with the local add-wavelength λb. Under the control of the controller, the third WSS performs an optical cross-connect and inputs the combined optical signal into the B-direction main optical path. The optical path from the third WSS through the output port of the first optical splitter to the input port of the fourth WSS can be understood as the add-wave loop of the second OTU. The output port of the first WSS reaches the second WSS through the second coupler, which can be understood as the drop-wave loop of the second OTU.

[0097] When a fault occurs in the optical cable connected to the second adjacent wavelength division multiplexing device in direction B, the third WSS sends the optical signal of wavelength λb of the second OTU to the fourth WSS through the upper wave loop. The third WSS can perform wavelength cross-connection under the control of the controller to complete the switching of the upper wave wavelength λb signal route. When a fault occurs in the optical cable in direction B, the optical signal of wavelength λb input from direction A enters the first WSS. The first WSS performs optical cross-connection under the control of the controller and inputs the optical signal of wavelength λb into the lower wave loop of wavelength λb through the demultiplexing port of the first WSS. The optical signal of lower wave wavelength λb is combined into the main optical path from direction B to direction A through the second coupler of the lower wave loop. The second WSS performs optical cross-connection and inputs the optical signal of wavelength λb to the receiving port of the second OTU, thereby completing the lower wave routing switching of the lower wave wavelength λb.

[0098] Similarly, for the A-direction link, during normal operation, the controller controls the fourth WSS in direction A to combine the passthrough wavelength (i.e., the optical signal from the first demultiplexer) with the local add-wavelength λa optical signal. The fourth WSS performs an optical cross-connect and inputs the combined optical signal into the main optical path in direction A. The add-wavelength path for the first OTU can be: fourth WSS → second splitter output → second WSS input. The output of the second WSS → first coupler → first WSS, which can be understood as the drop-wavelength path for the first OTU. If the optical cable connected to the first adjacent wavelength division multiplexing device in direction A fails, the fourth WSS, under the control of the controller, performs a wavelength cross-connect and sends the first OTU's wavelength λa optical signal via the add-wavelength path to the third WSS, completing the routing switch of the add-wavelength λa signal. If the optical cable in direction A fails, the wavelength λa signal input from direction B enters the second WSS. The second WSS is configured with the corresponding wavelength cross-connection, and the signal enters the drop-wavelength path for wavelength λa through the demultiplexer port of the second WSS. The drop wavelength λa is added to the main optical path from direction A to direction B via the drop loop. A wavelength crossover rule is configured on the first WSS to the receiving port of the first connected OTU, completing the drop routing switch for the drop wavelength λa.

[0099] Example 2, combined with Figure 13-14The structure of a wavelength division multiplexing device is described below when the second possible implementation method is used for the structures of the wavelength division multiplexing unit and the wavelength combination unit. The wavelength division multiplexing device includes a wavelength separation system (WSS). The first wavelength division multiplexing unit and the second wavelength division multiplexing unit each include a WSS having two input ports and N+2 output ports, i.e., a 2*(N+2)WSS. The first wavelength combination unit and the second wavelength combination unit each include a WSS having two output ports and N+2 input ports, i.e., a (N+2)*2WSS. Figure 13 A schematic diagram of the structure of a wavelength division multiplexing device provided in Example 2 of this application is shown in FIG. Figure 13 As shown, for example, the WSS of the first splitter unit is called the first WSS, the WSS of the second splitter unit is called the second WSS, the WSS of the first multiplexing unit is called the third WSS, and the WSS of the second multiplexing unit is called the fourth WSS. In some embodiments, the first WSS and the fourth WSS can be deployed on the same board or on different boards. The second WSS and the third WSS can be deployed on the same board or on different boards.

[0100] In a possible implementation manner, the wavelength division multiplexing device further includes at least four optical amplifiers, namely, first to fourth optical amplifiers. Figure 14 A schematic diagram of the structure of another wavelength division multiplexing device provided in Example 2 of this application is shown in FIG. Figure 14 As shown, a first optical amplifier is deployed at the input end of the first wavelength splitting unit, and the first coupler of the first wavelength splitting unit is optically connected to the first adjacent wavelength division multiplexing device via the first optical amplifier. A second optical amplifier is deployed at the input end of the second wavelength splitting unit, and the second coupler of the second wavelength splitting unit is optically connected to the second adjacent wavelength division multiplexing device via the second optical amplifier. A third optical amplifier is deployed at the output end of the first wavelength combining unit, and the third optical switch of the first wavelength combining unit is optically connected to the second adjacent wavelength division multiplexing device via the third optical amplifier. A fourth optical amplifier is deployed at the output end of the second wavelength combining unit, and the fourth optical switch of the second wavelength combining unit is optically connected to the first adjacent wavelength division multiplexing device via the fourth optical amplifier.

[0101] In some embodiments, the first WSS, the first optical amplifier, the fourth WSS, and the fourth optical amplifier may be deployed on the same board or on different boards. The second WSS, the second optical amplifier, the third WSS, and the third optical amplifier may be deployed on the same board or on different boards.

[0102] For example, consider the first OTU's wavelength λa and the second OTU's wavelength λb. For link B, during normal operation, the third WSS combines the optical signal at the pass-through wavelength (i.e., the optical signal from the first WSS) with the local add-on wavelength λb. Under the control of the controller, the third WSS performs an optical cross-connect, passing the combined optical signal through the third OA and inputting it into the main optical path in direction B.

[0103] The input port of the third WSS to the fourth WSS can be considered the second OTU's add-in loop. The output port of the first WSS to the second WSS can be considered the second OTU's drop-in loop. If the optical cable connecting to the second adjacent wavelength division multiplexing device in direction B fails, the third WSS, under the control of the controller, performs an optical cross-connection and sends the optical signal of wavelength λb of the second OTU via the add-in loop to the fourth WSS, completing the routing switch of the add-in wavelength λb signal. If the optical cable in direction B fails, the optical signal of wavelength λb input from direction A enters the first WSS. Under the control of the controller, the first WSS performs an optical cross-connection and inputs the optical signal of wavelength λb into the drop-in loop of wavelength λb through its demultiplexing port. After receiving the optical signal of wavelength λb via the drop-in loop, the second WSS merges the drop-in wavelength λb signal into the main optical path in direction B. The second WSS performs an optical cross-connection and inputs the optical signal of wavelength λb to the receiving port of the second OTU, completing the drop-in route switch of the drop-in wavelength λb.

[0104] Similarly, for the A-direction link, during normal operation, the controller controls the fourth WSS in direction A to combine the passthrough wavelength (i.e., the optical signal from the first wavelength splitter) with the local add-wavelength λa optical signal. The fourth WSS performs an optical cross-connect and inputs the combined optical signal into the main optical path from direction B to direction A. The add-wave loop of the first OTU can be: from the fourth WSS to the input port of the second WSS. The output port of the second WSS to the first WSS can be understood as the drop-wave loop of the first OTU. If the optical cable connecting to the first adjacent wavelength division multiplexing device in direction A fails, the fourth WSS, under the control of the controller, performs a wavelength cross-connect and sends the optical signal of wavelength λa of the first OTU via the add-wave loop to the third WSS, completing the routing switch of the add-wavelength λa signal. If the optical cable in direction A fails, the optical signal of wavelength λa input from direction B enters the second WSS. Under the control of the controller, the second WSS performs an optical cross-connect and enters the drop-wave loop of wavelength λa through the wavelength splitter port of the second WSS. Under the control of the controller, the first WSS combines the optical signal of the dropped wavelength λa into the main optical path from direction A to direction B. The first WSS performs an optical cross-connection to output the optical signal of the dropped wavelength λa to the receiving port of the first OTU, completing the drop routing switch of the dropped wavelength λa.

[0105] This application can achieve optical layer protection in the event of a fault without configuring the local dimension of the optical layer. It only requires the establishment of an upper wave loop and a lower wave loop. There is no need to add additional local dimension WSS and other devices, thereby reducing the configuration cost of the wavelength division multiplexing equipment.

[0106] Example 3, combined with Figures 15-18 The structure of the wavelength division multiplexing device is described when the second possible implementation method is used for the structures of the wavelength division multiplexing unit and the wavelength division multiplexing unit. The wavelength division multiplexing unit and the wavelength division multiplexing unit in the wavelength division multiplexing device include optical switches and WSSs. For ease of distinction, the optical switch included in the first wavelength division unit is referred to as the first optical switch, and the optical switch included in the second wavelength division unit is referred to as the second optical switch. The optical switch included in the first wavelength division unit is referred to as the third optical switch, and the optical switch included in the second wavelength division unit is referred to as the fourth optical switch. The WSS included in the first wavelength division unit is referred to as the first WSS, the WSS included in the second wavelength division unit is referred to as the second WSS, the WSS included in the first wavelength division unit is referred to as the third WSS, and the WSS included in the second wavelength division unit is referred to as the fourth WSS. Figure 15 This is a schematic diagram of the structure of a wavelength division multiplexing device provided in Example 3 of this application. Figure 15 As shown, the input end of the first optical switch is optically connected to the output end of the first adjacent wavelength division multiplexing device and the second WSS, respectively. The output end of the first optical switch is optically connected to the input end of the first WSS. The output end of the first WSS is optically connected to the input end of the third WSS and the input end of the second optical switch, respectively. The output end of the first WSS is also directly optically connected to at least one first OTU. The input end of the third WSS is also optically connected to the output end of the fourth optical switch, and the input end of the third WSS is also directly optically connected to at least one second OTU. The output end of the third WSS is optically connected to the input end 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 end of the second optical switch is also optically connected to the second adjacent wavelength division multiplexing device. The output end of the second optical switch is optically connected to the input end of the second WSS, and the output end of the second WSS is also optically connected to the fourth WSS. The output end of the second WSS is also directly optically connected to at least one second OTU. The input end of the fourth WSS is also directly optically connected to 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.

[0107] In a possible implementation manner, the wavelength division multiplexing device further includes at least four optical amplifiers, namely, first to fourth optical amplifiers.

[0108] Figure 16 This is a schematic diagram of the structure of another wavelength division multiplexing device provided in Example 3 of this application. Figure 16As shown, the first optical amplifier is disposed between the first optical switch and the first WSS; the second optical amplifier is disposed between the second optical switch and the second WSS; the third optical amplifier is disposed between the third optical switch and the third WSS; and the fourth optical amplifier is disposed between the fourth optical switch and the fourth WSS. The amplifiers described above are used to adjust the power of the input signal. For example, the first optical amplifier is deployed in the first demultiplexing unit, the second optical amplifier is deployed in the first multiplexing unit, the third optical amplifier is deployed in the second demultiplexing unit, and the fourth optical amplifier is deployed in the second multiplexing unit. In some embodiments, the first WSS and the fourth WSS can be deployed on the same board. The second WSS and the third WSS can be deployed on the same 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 deployed on the same board. The second WSS, the second OA, the second optical switch, the third optical switch, the third OA, and the third WSS are deployed on the same board.

[0109] Figure 17 This is a schematic diagram of the structure of another wavelength division multiplexing device provided in Example 3 of this application. Figure 17 As shown, a first optical amplifier is deployed at the input end of the first wavelength splitter unit, and the first optical switch of the first wavelength splitter unit is optically connected to the first adjacent wavelength division multiplexing device via the first optical amplifier; a second optical amplifier is deployed at the input end of the second wavelength splitter unit, and the second optical switch of the second wavelength splitter unit is optically connected to the second adjacent wavelength division multiplexing device via the second optical amplifier; a third optical amplifier is deployed at the output end of the first wavelength combiner unit, and the third switch of the first wavelength combiner unit is optically connected to the second adjacent wavelength division multiplexing device via the third optical amplifier; a fourth optical amplifier is deployed at the output end of the second wavelength combiner unit, and the fourth optical switch of the second wavelength combiner unit is optically connected to the first adjacent wavelength division multiplexing device via 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 deployed on the same single board. The second WSS, the second OA, the second optical switch, the third optical switch, the third OA, and the third WSS are deployed on the same single board.

[0110] Figure 18 This is a schematic diagram of the connection relationship between the various ports in the wavelength division multiplexing device provided in Example 3 of this application. Figure 18 Zhongcong Figure 8 The port perspective described here describes the connection relationship between each port in the wavelength division multiplexing device. Figure 18As shown, the input end of the first optical switch includes a first input port and a second input port. The first WSS can be a 1*(N+2) WSS. 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 N other output ports for connecting to OTUs. The output port of the first optical switch is optically connected to the input port of the first WSS via a first optical opening (OA). The second demultiplexing unit includes a second optical switch and a second WSS, which includes a third input port and a fourth input port. The second WSS can be a 1*(N+2) WSS. 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, as well as N other output ports for connecting to OTUs. The output port of the second optical switch is optically connected to the input port of the second WSS via a second optical opening (OA). The first multiplexing unit includes a third optical switch and a third WSS, which includes a fifth output port and a sixth output port. The third WSS can be a (N+2)*1 WSS. The third WSS includes N+2 input ports and one output port. The N+2 input ports include the fifth and sixth input ports, as well as the other N input ports for connecting to OTUs. The input port of the third optical switch is optically connected to the output port of the third WSS via the third OA. The second multiplexing unit includes a fourth optical switch and a fourth WSS, and the fourth optical switch includes the seventh and eighth output ports. The fourth WSS can adopt an (N+2)*1 WSS. The fourth WSS includes N+2 input ports and one output port. The N+2 input ports include the seventh and eighth input ports, as well as the other N input ports for connecting to OTUs. The input port of the fourth optical switch is optically connected to the output port of the fourth WSS via the fourth OA.

[0111] As an example, let's take the wavelength of the first OTU as λa and the wavelength of the second OTU as λb. For the B-direction link, during normal operation, the third WSS combines the pass-through wavelength (i.e., the optical signal from the first demultiplexer) with the optical signal at the local add-on wavelength λb. Under the control of the controller, the third WSS performs an optical cross-connect and inputs 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. Under the control of the controller, the third optical switch connects the input port of the third optical switch to the fifth output port. The third optical switch sends the signal to the second adjacent wavelength division multiplexing device via the fifth output port.

[0112] 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-in loop for 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 drop-in loop for the second OTU. If a fault occurs in the optical cable connected to the second adjacent wavelength division multiplexing device in direction B, the third WSS will send the optical signal of wavelength λb of the second OTU to the fourth WSS via the add-in loop. Under the control of the controller, the third optical switch connects its input port to its sixth output port, sending the optical signal of wavelength λb to the fourth WSS. If a fault occurs in the optical cable in direction B, the first input port and output port of the first optical switch connect, allowing the optical signal of wavelength λb input from direction A to enter the first WSS. Under the control of the controller, the first WSS performs optical cross-connection and inputs the optical signal of wavelength λb into the drop-in loop for wavelength λb via the wavelength demultiplexing port of the first WSS. The third input port and output port of the second optical switch connect. The optical signal at wavelength λb is sent to the second WSS via the second optical switch of the drop circuit. The second WSS performs an optical cross-connect and inputs the optical signal at wavelength λb to the receiving port of the second OTU, thus completing the drop routing switch for the drop wavelength λb.

[0113] Similarly, for the A-direction link, during normal operation, the controller controls the fourth WSS in direction A to combine the passthrough wavelength (i.e., the optical signal from the second wavelength splitter) with the optical signal at the local add-wavelength λa. The fourth WSS performs an optical cross-connect and inputs the combined optical signal into the main optical path in direction A. The seventh output port of the fourth optical switch is electrically conductive to its input port. The add-wave loop for the first OTU can 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, which can be understood as the drop-wave loop for the first OTU. If a fault occurs in the optical cable connected to the first adjacent wavelength division multiplexing device in direction A, the fourth WSS, under the control of the controller, performs a wavelength cross-connect, sending the optical signal at wavelength λa of the first OTU to the fourth optical switch. Under the control of the controller, the input port of the fourth optical switch is electrically conductive to its seventh output port, thereby transmitting the optical signal at wavelength λa to the third WSS, completing the routing switch of the add-wavelength λa signal. If the optical cable in direction A fails, wavelength λa signal light from direction B enters the second WSS. Under the control of the controller, the second WSS performs an optical cross-connect and sends the signal to the first optical switch through the fourth output port. The second input port and output port on the first optical switch are connected, allowing the wavelength λa signal light to enter the first WSS and be sent to the first OTU through the first WSS's wavelength drop port. Optical signals other than the dropped wavelength λa are then combined into the main optical path in direction B via the drop circuit.

[0114] Based on the above embodiments, the present application also provides 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 device includes a first demultiplexing unit, a first multiplexing unit, a second demultiplexing unit, and a second multiplexing unit. Figure 19 This is a flow chart of an optical signal processing method according to an embodiment of the present application. Figure 19 As shown, the method may include the following steps.

[0115] 1901. Receive a first optical signal from the first adjacent wavelength division multiplexing device.

[0116] 1902 : Separate a second optical signal to be sent to at least one first optical transmission unit (OTU) from the first optical signal by using the first wavelength splitting unit, and directly distribute the second optical signal to the at least one first OTU.

[0117] 1903. When the wavelength division multiplexing device is normally connected to the second adjacent wavelength division multiplexing device, control the first wavelength splitting unit to send the third optical signal in the first optical signal except the second optical signal to the first wavelength combining unit, and send the third optical signal to the second adjacent wavelength division multiplexing device through the first wavelength combining unit.

[0118] 1904 : When a connection failure occurs between the wavelength division multiplexing device and the second adjacent wavelength division multiplexing device, control the first wavelength splitting unit to send a third optical signal other than the second optical signal in the first optical signal to the second wavelength splitting unit.

[0119] 1905 : Control the second wavelength demultiplexing 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 demultiplexing unit.

[0120] 1906 : Control the second wavelength splitting unit to send a fifth optical signal in the third optical signal excluding the fourth optical signal to the second wavelength combining unit, and send the fifth optical signal to the first adjacent wavelength division multiplexing device through the second wavelength combining unit.

[0121] In one possible implementation, the method further includes: receiving an optical signal from at least one second OTU. When the connection between the wavelength division multiplexing device and the second adjacent wavelength division multiplexing device fails, controlling the first multiplexing unit to send the optical signal from the at least one second OTU to the first adjacent wavelength division multiplexing device. Optionally, sending the fifth optical signal to the second multiplexing unit through the second multiplexing unit in the above step 1906 specifically includes: after multiplexing the fifth optical signal and the optical signal from the at least one second OTU through the second multiplexing unit, sending the result to the first adjacent wavelength division multiplexing device.

[0122] In one possible implementation, the method further includes: receiving an optical signal from at least one first OTU. Multiplexing the fifth optical signal with the optical signal from the at least one second OTU using the second multiplexing unit, and then sending the result to the first adjacent wavelength division multiplexing device. Specifically, the method includes: 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 using the second multiplexing unit, and then sending the result to the first adjacent wavelength division multiplexing device.

[0123] In one possible implementation, controlling the first wave splitting unit to send a third optical signal other than the second optical signal in the first optical signal to the second wave splitting unit specifically includes: controlling the first wave splitting unit to perform optical cross-connection switching, and optically cross-connecting the third optical signal other than the second optical signal in the first optical signal to an output port connected to the second wave splitting unit.

[0124] The structures of the first demultiplexing unit, the second demultiplexing unit, the first combining unit and the second combining unit are as described above and will not be repeated here.

[0125] The present application also provides a computer-readable storage medium having stored therein instructions that, when executed on a computer or processor, cause the computer or processor to execute some or all of the steps executed by the control component in any embodiment of the present application.

[0126] An embodiment of the present application also provides a computer program product comprising instructions, which, when executed on a computer or processor, enables the computer or processor to execute some or all of the steps executed by the control component in any embodiment of the present application.

[0127] In the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0128] In this application, "at least one" means one or more, and "more" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple. In the text description of this application, the character " / " generally indicates that the related objects before and after are in an "or" relationship. In the formula of this application, the character " / " indicates that the related objects before and after are in a "divided" relationship. In addition, in this application, the word "exemplarily" is used to indicate an example, illustration or description. Any embodiment or design described as an "example" in this application should not be interpreted as being more preferred or advantageous than other embodiments or designs. Alternatively, it can be understood that the use of the word "example" is intended to present concepts in a specific way and does not limit this application.

[0129] It will be appreciated that the various numerical numbers involved in this application are merely for the purpose of describing the distinctions made, and are not intended to limit the scope of the embodiments of the present application. The size of the sequence numbers of the above-mentioned processes does not imply the order of execution, and the order of execution of each process should be determined by its function and inherent logic. Terms such as "first", "second", and similar expressions are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, comprising a series of steps or units. Methods, systems, products, or devices are not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or that are inherent to these processes, methods, products, or devices.

[0130] Although the present application has been described with reference to specific features and embodiments thereof, it is apparent that various modifications and combinations thereof may be made without departing from the spirit and scope of the present application. Accordingly, this specification and the drawings are intended to be illustrative only of the solutions defined by the appended claims and are to be construed as covering any and all modifications, variations, combinations or equivalents within the scope of the present application.

[0131] Obviously, those skilled in the art may make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these 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 intended to include these modifications and variations.

Claims

1. A wavelength division multiplexing device, characterized in that: The wavelength division multiplexing device includes a first wavelength demultiplexing unit, a first wavelength combining unit, a second wavelength demultiplexing unit and a second wavelength combining unit; wherein: The input end of the first wavelength demultiplexing unit is optically connected to the output end of the first adjacent wavelength division multiplexing device and the second wavelength demultiplexing unit respectively, and the output end of the first wavelength demultiplexing unit is optically connected to the input end of the first wavelength combining unit and the input end of the second wavelength demultiplexing unit respectively; the output end of the first wavelength demultiplexing unit is also directly optically connected to at least one first optical transmission unit OTU; The input end of the first multiplexing unit is further optically connected to the output end of the second multiplexing unit, and the input end of the first multiplexing unit is further directly optically connected to at least one second OTU; the output end of the first multiplexing unit is optically connected to a second adjacent wavelength division multiplexing device and the input end of the second multiplexing unit; The input end of the second wavelength demultiplexing unit is further optically connected to the second adjacent wavelength division multiplexing device, the output end of the second wavelength demultiplexing unit is further optically connected to the input end of the second wavelength combining unit, and the output end of the second wavelength demultiplexing unit is further directly optically connected to the at least one second OTU; The input end of the second multiplexing unit is also directly optically connected to the at least one first OTU; the output end of the second multiplexing unit is also optically connected to the first adjacent wavelength division multiplexing device; The first wavelength splitting unit is configured to separate a second optical signal and a third optical signal from the received first optical signal, send the second optical signal to the first OTU, and send the third optical signal to the first wavelength combining unit when the connection between the wavelength division multiplexing device and the second adjacent wavelength division multiplexing device is normal; and send the third optical signal to the second wavelength splitting unit when the connection between the wavelength division multiplexing device and the second adjacent wavelength division multiplexing device fails; The first multiplexing unit is configured to send the received fourth optical signal to the second adjacent wavelength division multiplexing device when the connection between the wavelength division multiplexing device and the second adjacent wavelength division multiplexing device is normal, and send the fourth optical signal to the second multiplexing unit when the connection between the wavelength division multiplexing device and the second adjacent wavelength division multiplexing device fails; the fourth optical signal includes at least an optical signal from the at least one second OTU; The second wavelength splitting 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, and send the seventh optical signal to the second wavelength combining unit when the wavelength division multiplexing device is normally connected to the first adjacent wavelength division multiplexing device, and send the seventh optical signal to the first wavelength splitting unit when the connection between the wavelength division multiplexing device and the first adjacent wavelength division multiplexing device fails; The second 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 is normally connected to the first adjacent wavelength division multiplexing device, and to send the eighth optical signal to the first multiplexing unit when the wavelength division multiplexing device fails to connect to the first adjacent wavelength division multiplexing device; the eighth optical signal includes at least an optical signal from the at least one first OTU.

2. The wavelength division multiplexing device according to claim 1, wherein: 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, where N is a positive integer; 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, the first output port is optically connected to the fifth input port; the second output port is optically connected to the third input port; N1 output ports of the first wavelength splitting unit other than the first output port and the second output port are directly optically connected to N1 first OTUs in a one-to-one correspondence, where N1 is less 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 other than the fifth input port and the sixth input port are directly optically connected to N2 second OTUs in a one-to-one correspondence, 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 splitting unit other than the third output port and the fourth output port are directly optically connected to N2 second OTUs in a one-to-one correspondence, 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 N1 input ports of the second multiplexing unit except the seventh input port and the eighth input port are directly optically connected to N1 first OTUs in a one-to-one correspondence.

3. The wavelength division multiplexing device according to claim 1, wherein: The first demultiplexing unit includes a first coupler and a first wavelength selective switch WSS, the second demultiplexing unit includes a second coupler and a second WSS, the first combining unit includes a first optical splitter and a third WSS, and the second combining unit includes a second optical splitter and a fourth WSS; The input end of the first coupler is optically connected to the output end of the first adjacent wavelength division multiplexing device and the second WSS respectively, the output end of the first coupler is optically connected to the input end of the first WSS, the output end of the first WSS is optically connected to the input end of the third WSS and the input end of the second coupler respectively, and the output end of the first WSS is also directly optically connected to at least one first OTU; The input end of the third WSS is further optically connected to the output end of the second optical splitter, the input end of the third WSS is further directly optically connected to at least one second OTU, the output end of the third WSS is optically connected to the input end of the first optical splitter, 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 coupler is further optically connected to the 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 directly optically connected to the at least one second OTU; The input end of the fourth WSS is also directly optically connected to 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 also optically connected to the first adjacent wavelength division multiplexing device.

4. The wavelength division multiplexing device according to claim 3, wherein: 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.

5. The wavelength division multiplexing device according to claim 3 or 4, characterized in that: The first wave splitting unit further includes a first optical amplifier, which is arranged between the first coupler and the first wavelength selective switch WSS; The second wave splitting unit further includes a second optical amplifier, which is arranged between the first coupler and the second WSS; The first combining unit further includes 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 includes 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, wherein: The first demultiplexing unit and the second demultiplexing unit are both WSSs; the first combining unit and the second combining unit are both WSSs.

7. The wavelength division multiplexing device according to claim 6, wherein: The WSSs included in the first demultiplexing unit and the second multiplexing unit are respectively deployed on the same single board, and the WSSs included in the second demultiplexing unit and the first multiplexing unit are respectively deployed on the same single board.

8. The wavelength division multiplexing device according to claim 1, wherein: The first demultiplexing unit includes a first optical switch and a first WSS, the second demultiplexing unit includes a second optical switch and a second WSS, the first combining unit includes a third optical switch and a third WSS, and the second combining unit includes a fourth optical switch and a fourth WSS; wherein, The input end of the first optical switch is optically connected to the output end of the first adjacent wavelength division multiplexing device and the second WSS respectively, the output end of the first optical switch is optically connected to the input end of the first WSS, the output end of the first WSS is optically connected to the input end of the third WSS and the input end of the second optical switch respectively, and the output end of the first WSS is also directly optically connected to at least one first OTU; 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 directly optically connected to at least one second OTU. The output end of the third WSS is optically connected to the input end of the third optical switch. The output end of the third optical switch 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 to the second adjacent wavelength division multiplexing device, the output end of the second optical switch 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 directly optically connected to the at least one second OTU; The input end of the fourth WSS is also directly optically connected to at least one first OTU, the output end of the fourth WSS is optically connected to the input end of a fourth optical switch, and the output end of the fourth optical switch is also optically connected to the first adjacent wavelength division multiplexing device.

9. The wavelength division multiplexing device according to claim 8, wherein: The first demultiplexing unit further includes a first optical amplifier, which is arranged between the first optical switch and the first wavelength selective switch WSS; The second wave splitting unit further includes a second optical amplifier, which is arranged between the second optical switch and the second WSS; The first multiplexing unit further includes 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 arranged between the fourth optical switch and the fourth WSS.

10. The wavelength division multiplexing device according to any one of claims 1 to 4 and 6 to 9, characterized in that: 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 deployed at the input end of the first wavelength division unit, and 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 deployed at the input end of the second wavelength splitting unit, and the second wavelength splitting unit is optically connected to the second adjacent wavelength division multiplexing device through the second optical amplifier; The third optical amplifier is deployed at the output end of the first multiplexing unit, and the first multiplexing unit is optically connected to 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 second multiplexing unit is optically connected to the first adjacent wavelength division multiplexing device through the fourth optical amplifier.

11. The wavelength division multiplexing device according to any one of claims 1 to 4 and 6 to 9, characterized in that: The wavelength division multiplexing device also includes a controller for controlling the first wavelength splitting unit to optically cross-link the third optical signal to the second wavelength splitting unit when a connection failure occurs between the wavelength division multiplexing device and the second adjacent wavelength division multiplexing device; and controlling the first wavelength combining unit to optically cross-link the fourth optical signal to the second wavelength combining unit.

12. The wavelength division multiplexing device according to claim 11, wherein: The controller is further configured to, when the wavelength division multiplexing device is normally connected to the second adjacent wavelength division multiplexing device, control the first wavelength splitting unit to optically cross the third optical signal to the first wavelength combining unit; and control the first wavelength combining 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 4 and 6 to 9, characterized in that: The wavelength division multiplexing device also includes a controller for controlling the second wavelength splitting unit to optically cross the seventh optical signal to the first wavelength splitting unit when a connection failure occurs between the wavelength division multiplexing device and the first adjacent wavelength division multiplexing device; and controlling the second wavelength combining unit to optically cross the eighth optical signal to the first wavelength combining unit.

14. The wavelength division multiplexing device according to claim 13, wherein: The controller is further configured to, when the wavelength division multiplexing device is normally connected to the first adjacent wavelength division multiplexing device, control the second wavelength splitting unit to optically cross the seventh optical signal to the second wavelength combining unit; and control the second wavelength combining unit to optically cross the eighth optical signal to the first adjacent wavelength division multiplexing device.

15. A method for processing an optical signal, characterized in that: The method is applied to a wavelength division multiplexing device, wherein the wavelength division multiplexing device includes a first wavelength demultiplexing unit, a first wavelength combining unit, a second wavelength demultiplexing unit, and a second wavelength combining unit; the method includes: receiving a first optical signal from a first adjacent 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 by the first wavelength demultiplexing unit, and directly distributing the second optical signal to the at least one first OTU; When the wavelength division multiplexing device is normally connected to the second adjacent wavelength division multiplexing device, control the first wavelength splitting unit to send a third optical signal other than the second optical signal in the first optical signal to the first wavelength combining unit, and send the third optical signal to the second adjacent wavelength division multiplexing device through the first wavelength combining unit; When a connection failure occurs between the wavelength division multiplexing device and the second adjacent wavelength division multiplexing device, controlling the first wavelength splitting unit to send a third optical signal other than the second optical signal in the first optical signal to the second wavelength splitting unit; Control the second wavelength splitting 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 splitting unit; The second wavelength splitting unit is controlled to send a fifth optical signal excluding the fourth optical signal in the third optical signal to the second wavelength combining unit, and the fifth optical signal is sent to the first adjacent wavelength division multiplexing device through the second wavelength combining unit.

16. The method according to claim 15, wherein The method further comprises: receiving an optical signal from at least one second OTU; When a connection failure occurs between the wavelength division multiplexing device and the second adjacent wavelength division multiplexing device, controlling the first multiplexing unit to send the optical signal from the at least one second OTU to the second multiplexing unit; The method of sending the fifth optical signal to the first adjacent wavelength division multiplexing device through the second multiplexing unit specifically includes: The fifth optical signal and the optical signal from the at least one second OTU are multiplexed by the second multiplexing unit and then sent to the first adjacent wavelength division multiplexing device.

17. The method according to claim 16, wherein The method further comprises: receiving an optical signal from at least one first OTU; The method further comprises: combining the fifth optical signal and the optical signal from the at least one second OTU, and sending the combined optical signal to the first adjacent wavelength division multiplexing device. 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 multiplexed by the second multiplexing unit and sent 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 wave splitting unit to send a third optical signal other than the second optical signal in the first optical signal to the second wave splitting unit specifically includes: The first demultiplexing unit is controlled to perform optical cross-connection switching, and a third optical signal other than the second optical signal in the first optical signal is optically cross-connected to an output port connected to the second demultiplexing unit.

Images