CN101030831B - Apparatus for wavelength division multiplexing and method for realizing its function - Google Patents

Abstract

The invention discloses a wavelength division multiplexing device, which includes a PID module and at least one service processing module connected by electrical signals, wherein the PID module is used to convert multi-wavelength optical signals into line service signals and output them to the service processing module, from The line service signal received by the service processing module is converted into a multi-wavelength optical signal, and the signal conversion of the service processing module is managed through the control signal; the service processing module is used to convert the line service signal received from the PID module under the management of the PID module. Line service signal, the branch service signal is converted into a line service signal and sent to the PID module. In the present invention, the PID module can connect multiple business processing modules to complete business processing, and the board structure is simple; when a module fails, only the faulty module needs to be replaced, which reduces maintenance costs; when the access business capacity increases, the business can be increased The processing module realizes the ability to expand gradually with the business growth.

Description

Wavelength division multiplexing device and method for realizing wavelength division multiplexing function

technical field

The present invention relates to a WDM (Wavelength Division Multiplex, wavelength division multiplexing) system, in particular to a wavelength division multiplexing device and a method for realizing WDM functions.

Background technique

WDM technology combines two or more optical carrier signals with different wavelengths and various information at the sending end through a multiplexer, and then couples them to the same optical fiber of the optical line for transmission; The optical carriers of various wavelengths are separated to further recover the signals carried in them. With the development of communication technology in recent years, the WDM service access capacity of network transmission equipment continues to increase, which puts forward higher requirements for the service access capability of a single subrack or single board card.

In existing communication equipment, the WDM function is usually implemented by a line card. A typical structure of a line card is shown in Figure 1. The line card includes a multiplexer board 110, a demultiplexer board 120, and a circuit board 130. The multiplexer board 110 and the demultiplexer board 120 provide line access through optical fiber interfaces. The multiplexer board 110. The splitter board 120 and the circuit board 130 are respectively connected by optical fibers.

The multiplexer board 110 includes a multiplexer unit 111 and a multiplexer CPU (Central Process Unit, central processing unit) unit 112, and the multiplexer unit 111 couples the multi-channel single-wavelength optical signals received from the circuit board 130 into one optical combined signal, that is, multiple The wavelength optical signal is sent from the optical fiber interface; the multiplexing CPU unit 112 is mainly composed of CPU and its peripheral circuits, and is connected with the multiplexing unit 111 by a control bus to manage and monitor the multiplexing unit 111.

The demultiplexing board 120 includes a demultiplexing unit 121 and a demultiplexing CPU unit 122, wherein the demultiplexing unit 121 decouples the multi-wavelength optical signals received from the optical fiber interface into multiple single-wavelength optical signals and outputs them to the circuit board 130 through optical fibers; The wave CPU unit 122 is also mainly composed of a CPU and its peripheral circuits, and is connected with the wave splitting unit 121 by a control bus, and manages and monitors the wave splitting unit 121 .

The circuit board 130 includes a service processing unit 131 and a service CPU unit 132. The service processing unit 131 receives a certain decoupled optical signal from the demultiplexing board 120, recovers the branch service signal carried in it, and passes the branch backplane interface 140 Send to the branch board; the service processing unit 131 receives the branch service signal from the branch backplane interface 140, converts it into an optical signal of a specific wavelength and outputs it to the multiplexer board 110, and the specific wavelength can satisfy the input of the multiplexer board 110 wavelength requirements. The line CPU unit 132 manages and monitors the service processing unit 131 .

In the prior art, the service capacity accessed by the optical fiber interface on the line card is all processed by the circuit board 130 . With the increase of the access service capacity, it is difficult for a single board to provide the service processing capability matching the access capacity. At this time, the line card is usually made into multiple PCB (Printed Circuit Board, printed circuit board) boards. Its physical structure can be shown in Figure 2. In FIG. 2 , the multiplexing board 110 and the demultiplexing board 120 can be made into a PCB board 150 , which includes an optical fiber interface 160 , and the circuit board 130 and the PCB board 150 are laminated. It can be seen that the structure of the line card is quite complicated, and its design must consider the structure and connection relationship between stacked boards, multiple boards and the backplane, such as alignment, tolerance of multiple connectors, and stacked boards. Problems such as installation and fixing have increased the workload of the design. Moreover, once a component on the line card fails, usually only the entire line card can be replaced, resulting in high maintenance costs.

In addition, for the line card that implements the WDM function, its service processing capability is fixed, but the service capacity accessed from the optical fiber interface is variable. In this way, if the user's access service capacity may increase in the future, the user must either purchase a line card that can meet its future needs in advance, or replace a new line card later, lacking the flexibility to increase service processing capacity with service growth.

Contents of the invention

Embodiments of the present invention provide a wavelength division multiplexing device and a method for realizing WDM functions, which reduce the design workload of WDM access boards, reduce maintenance costs, and provide capacity expansion capabilities that gradually increase with services.

The embodiment of the wavelength division multiplexing device provided by the embodiment of the present invention includes an optical integrated device PID module and at least one service processing module, the PID module and the service processing module are independent boards, and the PID module is connected to the service processing module through electrical signals, wherein :

The PID module is used to convert the multi-wavelength optical signal into a line service signal and output it to the service processing module, convert the line service signal received from the service processing module into a multi-wavelength optical signal, and manage the signal conversion of the service processing module through the control signal;

The service processing module is used to convert the line service signal received from the PID module into a branch service signal under the management of the PID module, and convert the branch service signal into a line service signal and send it to the PID module.

The embodiment of the present invention also provides a method for realizing the WDM function, which is applied to a device including a PID module and a processing module, and the method includes the following steps:

The PID module reads the online status signal of each business processing module, determines whether each business processing module is in an online state; and starts the work of the online business processing module;

The PID module converts the multi-wavelength optical signal of the access line into a line service signal and outputs it to the activated service processing module;

The activated service processing module converts the line service signal into branch service signal output under the management of the PID module;

Under the management of the PID module, the started service processing module converts the received branch service signal into a line service signal and outputs it to the PID module;

The PID module converts line service signals into multi-wavelength optical signals and outputs them from the access line.

In the embodiment of the present invention, the wavelength division multiplexing device is split into a PID (Photonic Integrated Device, optical integrated device) module and a business processing module, and the photoelectric conversion is completed on the PID module, so that the PID module can connect multiple The service processing module is used to complete the conversion of the line service signal and the branch service signal, which can avoid making the wavelength division multiplexing device into a multi-layer structure, or can reduce the number of layers of the multi-layer structure, and reduce the workload of board design; When a module fails, it is only necessary to replace the faulty module instead of the entire device, which reduces maintenance costs; since the access service capacity of one PID module can be processed by multiple service processing modules, users can choose to meet the current requirements. The business processing module of the access capacity is added when the capacity of the access business increases, realizing the capacity expansion capability with the gradual growth of the business.

Description of drawings

FIG. 1 is a schematic structural diagram of a line card implementing a WDM function in the prior art;

Fig. 2 is the physical structural diagram of the line card that realizes WDM function in the prior art;

3 is a schematic structural diagram of a PID module in an embodiment of a wavelength division multiplexing device of the present invention;

4 is a structural example diagram of a multi-wavelength multiplexing unit and an E/O conversion unit of a PID module in a wavelength division multiplexing device embodiment of the present invention;

5 is a schematic structural diagram of a service processing module in an embodiment of a wavelength division multiplexing device according to the present invention;

6 is a schematic diagram of the physical structure of the PID module and the service processing module in the embodiment of the wavelength division multiplexing device of the present invention;

7 is a schematic diagram of the connection of the backplane interface of the branch circuit on the backplane in the embodiment of the wavelength division multiplexing device of the present invention;

Fig. 8 is a flow chart of the processing of the service processing module by the main control unit in the wavelength division multiplexing device of the present invention.

Detailed ways

In the prior art, in the line card that realizes the WDM function, the multiplexer board, the demultiplexer board, and the circuit board are connected through optical fibers, and the circuit board, the multiplexer board, and the demultiplexer board have only one unified interface, respectively. All access service capacity is concentrated on the circuit board for service processing. This centralized implementation leads to complex structure and fixed service processing capability of the line card.

In the embodiment of the present invention, the wavelength division multiplexing device is split into a PID module and a business processing module. Electronic signals for business processing. The PID module and the service processing module are connected by electrical signals. When completing the WDM function, the PID module can be connected with more than one service processing module to form a wavelength division multiplexing device. Multiple such devices can be used on one subrack. WDM devices are used to access services with larger capacity.

The PID module converts the received multi-wavelength optical signal into a line service signal and outputs it to the service processing module, converts the line service signal received from the service processing module into a multi-wavelength optical signal, and manages the signal conversion process of the service processing module through the control signal ; The service processing module converts the line service signal received from the PID module into a branch service signal under the management of the PID module, and converts the branch service signal into a line service signal and sends it to the PID module.

The PID module and the service processing module can be separately made into boards, connected to their respective service processing interfaces, and the service processing interface completes the electrical signal connection between the PID module and the service processing module. The connection can be realized between the service processing interfaces by connecting wires between boards; when the wavelength division multiplexing device or the device where the device is located includes a backplane, the service processing interface can also be a slot on the backplane, The connection between the service processing interfaces is realized by the wires in the backplane.

In the wavelength division multiplexing device of the present invention, the PID module may have the structure shown in FIG. 3 . Both the multi-wavelength demultiplexing unit 310 and the multi-wavelength combining unit 340 of the PID module 300 are connected to the access optical fiber, and in the receiving direction of the access optical fiber, the multi-wavelength demultiplexing unit 310 decouples a multi-wavelength optical signal connected through the optical fiber It is a multi-channel single-wavelength optical signal, which is output to the O/E (optical) conversion unit 320 . The O/E conversion unit 320 performs photoelectric conversion on each optical signal to form a line service signal and sends it to the service processing module, and the service processing module completes the conversion from the line service signal to the branch service signal.

The multi-wavelength demultiplexing unit 310 can be realized by AWG (Arrayed Waveguide Grating, waveguide array grating). light signal. The AWG used to realize the multi-wavelength demultiplexing unit 310 has an input port and multiple output ports, and is made in the form of a waveguide. Each output port has a central wavelength and a passband, and these central wavelengths and passbands meet the requirements of the standard. The multi-wavelength demultiplexing unit 310 can also be realized by other devices with demultiplexing functions, and if necessary, EDFA (erbium-doped fiber amplifier) or EDWA (erbium-doped waveguide amplifier) can be added to compensate for the optical loss of the demultiplexing devices such as AWG.

The O/E conversion unit 320 may include a PD (Photodiode) chip and peripheral circuits to realize the function of converting an optical signal into an electrical signal. The multi-wavelength demultiplexing unit 310 and the O/E conversion unit 320 in the PID module 300 are usually packaged as a semiconductor element.

When the format of the transmission signal between the service processing interface 400 is different from the output signal format of the O/E conversion unit 320, or when the line service signal is distorted after passing through the service processing interface 400, the O/E conversion unit 320 and The data recovery unit 330 is connected in series between the service processing interfaces 400 . The data recovery unit 330 performs shaping and/or level conversion on the line service signal output by the O/E conversion unit 320 to match the transmission signal format of the service processing interface 400 . The data recovery unit 330 usually includes an electrical signal amplifier and an electrical signal clock data recovery circuit to amplify and regenerate the line service signal so that when it reaches the service processing module through the two service processing interfaces 400, it can still correctly reflect the carried information .

In the sending direction of the access fiber, the PID module 300 receives line service signals from the service processing interface 400 , and the line service signals are input to the E/O (electro-optic) conversion unit 350 of the PID module 300 . The E/O conversion unit 350 performs electro-optical conversion on the line service signals to form multiple channels of single-wavelength optical signals, which are output to the multi-wavelength multiplexing unit 340 . The multi-wavelength combining unit 340 couples multiple single-wavelength optical signals into one multi-wavelength optical combined signal, which is sent from the access optical fiber.

An example implementation of the multi-wavelength multiplexing unit 340 and the E/O conversion unit 350 may have the structure shown in FIG. 4 , where the multi-wavelength multiplexing unit 340 is implemented using an arrayed waveguide grating 341 . In the E/O conversion unit 350, the data channel subunit 354 outputs the line service signals from the service processing module to each light source link subunit 351; each light source link subunit 351 is composed of a light source, a modulator module, an optical The line service signal output by the data channel subunit 354 is modulated into an optical signal of a fixed wavelength, and output to the TAP (optical coupler) subunit 352 corresponding to each light source link subunit 351 ; The TAP subunit 352 has the functions of an optical splitter and an optical switch, and can split part of the optical signal output by the light source link subunit 351, such as 1% output to the link monitoring subunit 355 for link monitoring, and can also use The optical signal of a certain wavelength is output to the arrayed waveguide grating 341 or turned off; the link monitoring subunit 355 completes the monitoring of each optical signal according to the optical signal split by the TAP subunit 352, including power, wavelength drift or temperature, etc. monitoring, and interact with the main control unit 370 for control information. The waveguide array grating 341 couples optical signals of different wavelengths received from each TAP subunit 352 into one multi-wavelength optical signal.

The E/O conversion unit 350 and the arrayed waveguide grating 341 in FIG. 4 are usually integrated on the same semiconductor substrate, and each link uses a light source with a fixed wavelength, and its wavelength can vary in a small range with temperature. In general, the light source can be a DFB (distributed feedback laser) laser or a DBR (distributed Bragg reflective laser) laser, where the wavelength of the DFB or DBR laser using InP (indium phosphide) material varies with temperature at a rate of 0.1nm/ °C (nanometers per degree).

The arrayed waveguide grating 341 can also be replaced by other devices, such as N×1 PLC (Planar Lightwave Circuit, planar light waveguide) waveguide multiplexer, star multiplexer, MMI (MultimodeInterference, multimode interference) multiplexer, etc., If necessary, EDFA or EDWA can also be added to compensate the optical loss of multiplex devices such as AWG.

Please refer to Fig. 3 again, when the format of the transmission signal between the service processing interfaces 400 is different from the input signal format of the E/O conversion unit 350, or when the distortion of the line service signal after passing through the service processing interface 400 is relatively large, the E The data drive unit 360 is connected in series between the I/O conversion unit 350 and the service processing interface 400 . The data driving unit 360 performs shaping and/or level conversion on the line service signal output by the service processing interface 400 to match the input signal format of the E/O conversion unit 350 . Usually, the data driving unit 360 amplifies the line service signal to enhance the driving capability of the line service signal.

In addition to other units in the PID module, the main control unit 370 in the PID module 300 includes a multi-wavelength demultiplexing unit 310, an O/E conversion unit 320, a data recovery unit 330, a multi-wavelength multiplexing unit 340, and an E/O conversion unit 350 and data driver unit 360 not only perform operation control and status monitoring, but also connect to the slave control unit in the business processing module, and manage the business processing module through the slave control unit, including its operation control and status monitoring. It can be seen that the service processing interface 400 can not only transmit the line service signal between the PID module 300 and the service processing module, but also transmit the control signal between the master control unit 370 and the slave control unit in the service processing module. The main control unit 370 usually uses a CPU to implement management functions. The specific management functions of the main control unit 370 for each unit in the PID module 300 may include performance monitoring, initialization, and abnormal state alarming, etc., which may be implemented in the way of the prior art, and will not be repeated here.

In the wavelength division multiplexing device of the present invention, the service processing module may have the structure shown in FIG. 5 . The low-rate tributary service signal from the tributary board is input to the service mapping unit 520 of the service processing module 500 through the tributary backplane interface 140 . The service mapping unit 520 encapsulates and maps multiple tributary services into a high-rate service channel, in other words, maps tributary service signals into line service signals, and sends the line service signals to the PID module.

For the line service signal from the PID module, the service demapping unit 530 demaps the line service signal into a branch service signal, that is, decapsulates the information transmitted by the high-rate service channel, restores it to low-rate branch service information, and passes The tributary backplane interface 140 on the backplane outputs to the tributary board.

As mentioned above, the service processing module 500 and the PID module may be connected through the service processing interface 400 . When the format of the output signal of the service mapping unit 520 and the format of the input signal of the service demapping unit 530 are different from the format of the transmission signal between the service processing interface 400, or when the line service signal is greatly distorted after passing through the service processing interface 400, you can The electrical data processing unit 510 is connected in series between the service processing interface 400 and the service mapping unit 520 , and is also connected in series between the service processing interface 400 and the service demapping unit 530 . The electrical data processing unit 510 performs shaping and/or level conversion on the input line service signal and outputs it, including shaping the line service signal from the service processing interface 400 and outputting it to the service demapping unit 530, and converting the line service signal from the service mapping unit The line service signal at 520 is amplified and then output to the service processing interface 400 .

The slave control unit 540 in the business processing module 500 is connected to the main control unit in the PID module through a control signal, and according to the instructions of the main control unit, each unit in the business processing module 500, including the electrical data processing unit 510, the business mapping unit 520 and the The service demapping unit 530 performs operation control and status monitoring. In other words, in the business processing module 500, the slave control unit 540 directly manages other units, and the management work of the slave control unit 540 is controlled by the master control unit in the PID module, so that the master control unit in the PID module essentially manages the waves other units in the multiplexing device. The slave control unit 540 may include a CPU, or may be implemented by digital logic circuits, such as FPGA (Field Programmable Gate Array, Field Programmable Gate Array) and CPLD (Complex Programmable Logical Device, programmable logic device). The specific management function and implementation of other units in the service processing module 500 by the slave control unit 540 may also adopt the methods in the prior art.

When the slave control unit 540 is implemented with a digital logic circuit, the main control unit in the PID module operates the digital logic circuit through control signals such as address, data, and interrupt, including resetting the chip, interrupt reporting, etc., so that the main control unit The management of the service processing module 500 is completed. In this implementation, the master control unit can perform logic loading on the digital logic circuit of the slave control unit 540 when the service interface module 500 is started. In order to enable the main control unit to automatically discover the business processing module 500 connected to the PID module where it is located, the online status signal of the business processing module 500 can be added in the control signal connecting the PID module and the business processing module 500, when the business processing module 500 is online Only when the state signal takes on a predetermined state. After learning that a service processing module 500 is online, the main control unit loads the digital logic circuit of the service processing module 500, initializes each unit of the service processing module 500, and starts the service processing module 500 to work.

For example, the online state signal line of the service processing module can be connected to the main control unit of the PID module, the online state signal line is grounded on the service processing module, and connected to the power supply on the PID module. After the service processing module is inserted into the service processing interface on the backplane, the online status signal line of the service processing module on the PID module changes from high level to low level, so that the main control unit of the PID module knows the service processing The module is online.

In the wavelength division multiplexing device, the PID module 300 and the service processing module 500 may have the physical structure shown in FIG. 6 . The PID module 300 has an optical fiber interface 160 connected to the multi-wavelength demultiplexing unit and the multi-wavelength combining unit for input and output of multi-wavelength optical signals to the PID module. The PID module 300 is inserted into the service processing interface on the backplane, and the service processing module 500 is inserted into the service processing interface and the tributary backplane interface on the backplane.

There may be multiple interfaces connected to the PID modules and multiple interfaces connected to the service processing modules on the backplane, and each PID module is respectively connected to one or more service processing modules. For example, in FIG. 7, the backplane includes an interface 720 connected to the PID module and five interfaces 710 connected to the service processing module, and the interface 720 connected to the PID module is respectively connected to each interface 710 connected to the service processing module. Connection signals include line service signals and control signals.

In this way, the PID module and the business processing module can be inserted into the corresponding interfaces respectively, and the PID module can automatically identify which interface the business processing module is inserted into from the online status signal line, and automatically perform logic loading, chip initialization, and start the work of the business processing module . The business accessed by a PID module can be processed by multiple business processing modules, and these business processing modules can have the same or different business processing capacity; when the access business capacity increases, new business processing modules can be inserted to complete Add some business processing, so that you can flexibly select and configure business processing modules according to actual application requirements, while taking into account cost and performance.

The business processing module can be made into a board with a unified backplane interface, so that when any business processing module fails, it can be replaced separately, reducing maintenance costs. It is also possible to further make the business processing modules into the same board to reduce the types and quantities of spare parts.

For example, the wavelength division multiplexing device includes a PID module and three service processing modules. The service access capacity of the PID module is 120Gbps (gigabit per second), carried by 12 wavelengths, and each wavelength transmits 10G; each service The processing service capacity of the processing module is 40Gbps, so the three service processing modules just complete the service processing of the PID module. Of course, the processing capacity of the three service processing modules can also be different, such as 50Gbps, 40Gbps and 30Gbps respectively, or 60Gbps, 40Gbps and 20Gbps, etc., or 50Gbps, 50Gbps and 50Gbps, which is convenient for future access capacity upgrade.

In the embodiment of the method for realizing the WDM function of the present invention, in the receiving direction of the wavelength division multiplexing device, the PID module converts the multi-wavelength optical signal of the access line into a line service signal, and outputs the line service signal to the service processing module; Under the management of the PID module, the service processing module converts line service signals into tributary service signals and outputs them to the tributary board. In the sending direction of the wavelength division multiplexing device, the business processing module will receive the branch service signal from the branch board under the management of the PID module, convert the received branch service signal into a line service signal, and then output it to the PID module; the PID module Convert the line service signal into a multi-wavelength optical signal, and output the multi-wavelength optical signal from the access line. The main control unit of the PID module manages the conversion between the multi-wavelength optical signal and the line service signal, and manages the conversion between the line service signal of the service processing module and the branch service signal through the slave control unit on the service processing module.

The main control unit of the PID module can control a service processing module by using the flow shown in FIG. 8 to realize the WDM function. When the control signal between the PID module and the service processing module includes the online status signal of the service processing module, step S810 to step S830 are performed.

Step S810: the main control unit reads the online status signal of the connected service processing module after being powered on. The online status signal of each business processing module is unique to the main control unit. The main control unit can not only judge whether the corresponding business processing module is online or offline through the online status signal, but also use the online status signal as a different business processing Module identification to distinguish each online business processing module.

Step S820: The main control unit judges whether the business processing module is online according to the status signal, if yes, proceed to step S830; if not, end the processing of the business processing module.

Step S830: Start the online service processing module to work. If the slave control unit of the service processing module includes a CPU, the master control module may instruct the slave control unit to initialize the service processing module. When the slave control unit of the business processing module is a digital logic circuit, the main control unit loads the digital logic circuit online and instructs it to complete the initialization of the business processing module; logic circuits to operate.

The main control unit can allocate its processing resources according to the actual situation during the loading and/or initialization process, so as to prevent the interruption of existing services caused by excessive processing resources occupied by the loading and/or initialization process.

Step S840: the master control unit manages the conversion of the line service signal and the branch service signal of the service processing module through the slave control unit. The management of the business processing module may include operation control and status monitoring, such as business performance monitoring, initialization control, and alarm handling.

When the service processing module is offline, the main control unit can be notified by means of interruption, and the main control unit performs protection switching of the service after receiving the interruption, so as to ensure the switching time of the service. At this time, the main control unit may execute step S850 and step S860.

Step S850: When the service processing module is offline, receive the offline interrupt of the service processing module. When the business processing module is offline, the state of its online status signal changes from online to offline; the PID module can know that the business processing module is offline according to this state change, and can further generate an interrupt signal according to this state change to notify the host in time control unit.

Step S860: switch the line service signal protection to other online service processing modules.

It should be noted that, in addition to executing the process in Figure 8, the main control unit also manages the conversion between multi-wavelength optical signals and line service signals on the PID module where it is located, including operation control and status monitoring, such as service performance monitoring , initialization control, alarm handling, etc.

In the embodiment of the present invention, the service processing module can be flexibly configured according to the size of the access service volume. When the access service volume increases, the service processing module is added, which is convenient for upgrading and expansion, and does not affect the existing services. A single optical fiber interface completes multiple The wavelength optical signal access reduces the operation of the optical fiber link; when the business processing module fails, the faulty module can be replaced independently, and the cost of spare parts and maintenance is low; The module is offline, thereby reducing the power consumption of the whole machine; the structure of the PID module and the business processing module is simple, and there is no need to consider the stacked structural relationship when designing the board, which reduces the design complexity.

The embodiments of the present invention described above are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims (11)

1. A wavelength division multiplexing device, characterized in that, comprises an optical integrated device PID module and at least one business processing module, the PID module and the business processing module are respectively independent boards, and the PID module is connected to the business processing module by electrical signals, in: The PID module is used to convert the multi-wavelength optical signal into a line service signal and output it to the service processing module, convert the line service signal received from the service processing module into a multi-wavelength optical signal, and manage the signal conversion of the service processing module through the control signal; The service processing module is used to convert the line service signal received from the PID module into a branch service signal under the management of the PID module, and convert the branch service signal into a line service signal and send it to the PID module. 2. wavelength division multiplexing device as claimed in claim 1, is characterized in that: described PID module comprises main control unit; Described service processing module comprises from control unit, and main control unit passes through from control unit to service processing module Signal transitions are managed. 3. The wavelength division multiplexing device according to claim 2, characterized in that: the slave control unit is a digital logic circuit, and the master control unit loads control logic for it when starting. 4. The wavelength division multiplexing device according to claim 2, wherein the control signal includes an online status signal of the service processing module, which is used for the main control unit to judge whether the service processing module is online. 5. The wavelength division multiplexing device according to any one of claims 1 to 4, wherein the PID module comprises a multi-wavelength demultiplexing unit, a photoelectric O/E conversion unit, a multi-wavelength combining unit and an electro-optical E /O conversion unit, where: The multi-wavelength demultiplexing unit is used to decouple the received multi-wavelength optical signal into multiple single-wavelength optical signals and output them to the O/E conversion unit; The O/E conversion unit is used to convert multiple single-wavelength optical signals into line service signals and output them to the service processing module; The E/O conversion unit is used to convert the line service signal from the service processing module into multiple single-wavelength optical signals and output them to the multi-wavelength multiplexing unit; The multi-wavelength combining unit is used to couple multiple single-wavelength optical signals into one multi-wavelength optical signal. 6. wavelength division multiplexing device as claimed in claim 5, is characterized in that, described PID module also comprises data recovery unit and data driving unit, wherein: The data recovery unit is used to shape and/or level-convert the line service signal output by the O/E conversion unit and output it to the service processing module; The data driving unit is used to shape and/or level-convert the line service signal received from the service processing module and output it to the E/O conversion unit. 7. The wavelength division multiplexing device according to any one of claims 2 to 4, wherein the service processing module includes a service mapping unit, a service demapping unit and an electrical data processing unit, wherein: The service mapping unit is used to map branch service signals to line service signals under the management of the slave control unit; The service demapping unit is used to demap line service signals into branch service signals under the management of the slave control unit; The electrical data processing unit is used to shape and level-convert the line service signal from the PID module and output it to the service demapping unit, and to shape and/or level-convert the line service signal from the service mapping unit and output it to the PID module. 8. The wavelength division multiplexing device according to claim 1, characterized in that: the device also includes a backplane, and the backplane has at least two business processing backplane interfaces, which are respectively connected to the PID module and the business processing module, It is used to transfer line service signals and control signals between the PID module and the service processing module. 9. A method for realizing WDM functions, characterized in that, being applied to a device comprising a PID module and a processing module, the method may further comprise the steps: The PID module reads the online status signal of each business processing module, determines whether each business processing module is in an online state; and starts the work of the online business processing module; The PID module converts the multi-wavelength optical signal of the access line into a line service signal and outputs it to the activated service processing module; The activated service processing module converts the line service signal into branch service signal output under the management of the PID module; Under the management of the PID module, the started service processing module converts the received branch service signal into a line service signal and outputs it to the PID module; The PID module converts line service signals into multi-wavelength optical signals and outputs them from the access line. 10. The method for realizing the WDM function as claimed in claim 9 is characterized in that: the management of the PID module is carried out by the slave control unit of the service processing module; the slave control unit is a digital logic circuit; Said activating the online service processing module includes: PID module loading the digital logic circuit of the service processing module. 11. realize the method for WDM function as claimed in claim 9, it is characterized in that, the management of described PID module to service processing module also comprises: When the business processing module is offline, the PID module learns that it is offline from the change of the online status signal of the business processing module; Switch the line service signal to other online service processing modules.

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