A multi-wavelength coherent optical module

Abstract

The application provides a multi-wavelength coherent light module and relates to the technical field of optical communication.The multi-wavelength coherent light module comprises a transmitting end chip, a receiving end chip, a transmitting port, a receiving port and a light source module, the transmitting port and the light source module are connected with the transmitting end chip, and the receiving port and the light source module are connected with the receiving end chip.Through the separation design of the transmitting end chip and the receiving end chip, the physical separation of the transmitting and receiving functions is realized, the chip area is reduced, the cost is lowered, the thermal interference and the electric crosstalk can be effectively avoided, and the system stability is improved; and the light signals of different wavelengths are split in the light source module and then transmitted to the transmitting end chip and the receiving end chip respectively, so that the efficient sharing of multi-wavelength resources between the transmitting and receiving paths is realized.

Description

Technical Field

[0001] This invention relates to the field of optical communication technology, and more specifically, to a multi-wavelength coherent optical module. Background Technology

[0002] With the rapid development of cloud computing, artificial intelligence, and ultra-high-definition video services, the bandwidth demand of optical communication systems is growing exponentially. Traditional single-wavelength intensity modulation direct detection (IM-DD) technology is no longer sufficient to meet the requirements of speeds above 400Gbps. Coherent optical communication, due to its advantages such as high sensitivity, strong dispersion tolerance, and support for high-order modulation formats, has become the core technology direction for next-generation high-speed optical modules.

[0003] Currently, most mainstream coherent optical modules use InP (indium phosphide) or LiNbO3 (lithium niobate) platforms to integrate modulators and detectors, but these methods suffer from high cost, large size, and difficulty in large-scale integration. In recent years, silicon photonics technology has gained widespread attention in the field of optical modules due to its advantages such as compatibility with CMOS processes, ease of integration, and low cost.

[0004] In related technologies, there are already solutions that integrate the transmitter and receiver on the same silicon photonic chip, but this single-chip integration solution has problems such as large thermal interference, severe electrical crosstalk, difficulty in sharing wavelength resources, and large chip area. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-wavelength coherent optical module to solve problems such as large thermal interference, severe electrical crosstalk, difficulty in wavelength resource sharing, and large chip area in related technologies.

[0006] The embodiments of the present invention can be implemented as follows: In a first aspect, the present invention provides a multi-wavelength coherent optical module, including a transmitter chip, a receiver chip, a transmitter port, a receiver port, and a light source module, wherein the transmitter port and the light source module are both connected to the transmitter chip, and the receiver port and the light source module are both connected to the receiver chip; The light source module is used to generate multiple initial light signals of different wavelengths, and split each initial light signal into a first split signal and a second split signal, which are then transmitted to the transmitting chip and the receiving chip, respectively. The transmitter chip is used to modulate the first split optical signals of each received wavelength to obtain the corresponding modulated optical signals; and to synthesize the multiple modulated optical signals of different wavelengths into a first multi-wavelength optical signal and output it to the transmitter port. The receiving chip is used to take the second split signal of each wavelength as the local oscillator light; to divide the second multi-wavelength optical signal received through the receiving port into multiple demodulated optical signals of different wavelengths; and to perform frequency mixing processing on each wavelength demodulated optical signal and the local oscillator light of the corresponding wavelength.

[0007] In an optional implementation, the light source module includes multiple light emitting components, each of which includes a laser, an isolator, and a beam splitter; The isolator is disposed between the laser and the beam splitter to isolate optical noise; The laser is used to generate an initial optical signal with a fixed wavelength; the initial optical signal passes through the isolator and reaches the beam splitter; the initial optical signal output by the lasers in different optical emitting components has a different wavelength; The beam splitter is used to split the received initial optical signal to obtain the first split signal and the second split signal.

[0008] In an optional embodiment, each of the light emitting components further includes a thermoelectric cooler, and the laser, the isolator, and the beam splitter are all disposed on the thermoelectric cooler; The semiconductor cooler is used to control the temperature of the laser.

[0009] In an optional embodiment, the light source module includes multiple output port groups, each output port group including a first output port and a second output port; the first output port is connected to the transmitter chip, and the second output port is connected to the receiver chip; The first output port is used to output the first split signal, and the second output port is used to output the second split signal.

[0010] In an optional embodiment, the multi-wavelength coherent optical module further includes a transmitter fiber array and a receiver fiber array. The transmitter port and the light source module are both connected to the transmitter chip through the transmitter fiber array, and the receiver port and the light source module are both connected to the receiver chip through the receiver fiber array. The transmitting fiber array is used to couple the first split signal output by the light source module to the transmitting chip, and to output the first multi-wavelength optical signal synthesized by the transmitting chip to the transmitting port; The receiving fiber array is used to couple the second split signal output by the light source module to the receiving chip, and to couple the second multi-wavelength optical signal received by the receiving port to the receiving chip.

[0011] In an optional implementation, the transmitter chip integrates a multiplexer for combining multiple modulated optical signals of different wavelengths into the first multi-wavelength optical signal.

[0012] In an optional implementation, the receiver chip integrates a demultiplexer, which is used to divide the second multi-wavelength optical signal into multiple demodulated optical signals of different wavelengths.

[0013] In an optional implementation, the receiver chip integrates multiple mixers, each corresponding to a different wavelength. The second split signal and the signal to be demodulated are input into the corresponding mixers according to their wavelengths for mixing.

[0014] In an optional implementation, the transmitter chip and the receiver chip are independently mounted on a PCB board.

[0015] In an optional implementation, the light source module is connected to the PCB board via an FPC board.

[0016] The beneficial effects of the multi-wavelength coherent optical module provided in this embodiment of the invention include: The multi-wavelength coherent optical module provided in this embodiment of the invention includes a transmitter chip, a receiver chip, a transmitter port, a receiver port, and a light source module. The transmitter port and the light source module are both connected to the transmitter chip, and the receiver port and the light source module are both connected to the receiver chip. The light source module is used to generate multiple initial optical signals of different wavelengths and split each initial optical signal to form a first split signal and a second split signal, which are transmitted to the transmitter chip and the receiver chip, respectively. The transmitter chip is used to modulate the first split signals of each received wavelength to obtain the corresponding modulated optical signals. The multiple modulated optical signals of different wavelengths are combined to form a first multi-wavelength optical signal and output to the transmitter port. The receiver chip is used to use the second split signals of each received wavelength as local oscillator light. The second multi-wavelength optical signal received through the receiver port is divided into multiple demodulated optical signals of different wavelengths, and each demodulated optical signal of a wavelength is mixed with the local oscillator light of the corresponding wavelength. By separating the transmitter chip and receiver chip, the physical separation of transmission and reception functions is achieved, which reduces chip area and cost, while also effectively avoiding thermal interference and electrical crosstalk, and improving system stability. Furthermore, by splitting optical signals of different wavelengths in the light source module and transmitting them to the transmitter chip and receiver chip respectively, the efficient sharing of multi-wavelength resources between the transmission and reception paths is realized. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a first structural block diagram of the multi-wavelength coherent optical module provided in this embodiment; Figure 2 This is a second structural block diagram of the multi-wavelength coherent optical module provided in this embodiment; Figure 3 This is a structural block diagram of the light source module in the multi-wavelength coherent optical module provided in this embodiment; Figure 4 This is a third structural block diagram of the multi-wavelength coherent optical module provided in this embodiment.

[0019] Icons: 100 - Multi-wavelength coherent optical module; 110 - Transmitter chip; 120 - Receiver chip; 130 - Transmit port; 140 - Receiver port; 150 - Light source module; 160 - PCB board; 170 - FPC board; 180 - Transmitter fiber array; 190 - Receiver fiber array; 151 - Optical emission assembly; 152 - Output port group; 1511 - Laser; 1512 - Isolator; 1513 - Beam splitter; 1514 - Semiconductor cooler; 1521 - First output port; 1522 - Second output port. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0024] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0025] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0026] In related technologies, coherent optical modules that integrate the transmitter, receiver, and splitter on a single chip present the following problems: First, the splitting ratio is fixed during the chip design phase, making wavelength resource allocation inflexible and hindering efficient sharing of wavelength resources between the transmit and receive paths; second, integrating the transmitter and receiver on the same chip causes severe thermal interference and electrical crosstalk; third, achieving multi-wavelength transceiver integration on a single chip results in complex optical path wiring, a large chip area, and high costs; finally, as the number of channels increases, on-chip space becomes limited, making it difficult to support the integration of more wavelengths and resulting in poor scalability.

[0027] To address the aforementioned issues, this invention provides a multi-wavelength coherent optical module. By separating the transmitter chip and receiver chip, the physical separation of transmission and reception functions is achieved, reducing chip area and cost while effectively avoiding thermal interference and electrical crosstalk, thus improving system stability. Furthermore, by splitting optical signals of different wavelengths in the light source module and transmitting them to the transmitter chip and receiver chip respectively, efficient sharing of multi-wavelength resources between the transmission and reception paths is realized.

[0028] The multi-wavelength coherent optical module provided in the embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0029] Please refer to Figure 1 The multi-wavelength coherent optical module 100 provided in this embodiment of the invention includes a transmitter chip 110, a receiver chip 120, a transmitter port 130, a receiver port 140, and a light source module 150. The transmitter port 130 and the light source module 150 are both connected to the transmitter chip 110, and the receiver port 140 and the light source module 150 are both connected to the receiver chip 120.

[0030] The light source module 150 is used to generate multiple initial light signals of different wavelengths, and split each initial light signal into a first split light signal and a second split light signal, which are transmitted to the transmitter chip 110 and the receiver chip 120 respectively. The transmitter chip 110 is used to modulate the received first split light signals of each wavelength to obtain the corresponding modulated light signals. The multiple modulated light signals of different wavelengths are combined into a first multi-wavelength light signal and output to the transmitter port 130. The receiver chip 120 is used to use the received second split light signals of each wavelength as local oscillator light. The second multi-wavelength light signal received through the receiver port 140 is divided into multiple demodulated light signals of different wavelengths, and each demodulated light signal of a wavelength is mixed with the local oscillator light of the corresponding wavelength.

[0031] In this embodiment, the number of initial light signals of different wavelengths generated in the light source module 150 can be set according to actual needs, for example, it can be 2 wavelengths, 3 wavelengths, 4 wavelengths, etc.

[0032] In this embodiment, the light source module 150 splits the initial light signal of each wavelength into a first split signal and a second split signal, which are transmitted to the transmitter chip 110 and the receiver chip 120 respectively. The first split signal is used for signal modulation transmission, and the second split signal is used as the local oscillator light of the corresponding wavelength for coherent mixing, thereby realizing the efficient sharing of multi-wavelength resources between the transmission and reception paths.

[0033] It is understandable that the first and second split signals have the same wavelength, such as... Figure 1 The two dashed lines represent the first and second optical signals with wavelength λ1 being transmitted to the transmitter chip 110 and receiver chip 120, respectively. The two thin solid lines represent the first and second optical signals with wavelength λ2 being transmitted to the transmitter chip 110 and receiver chip 120, respectively.

[0034] In this embodiment, after multiple first optical signals of different wavelengths are input to the transmitter chip 110, each first optical signal is modulated by the transmitter chip 110 to obtain a modulated optical signal carrying data information. Then, the modulated optical signals corresponding to each first optical signal are combined into a first multi-wavelength optical signal and output to the transmitter port 130. It can be understood that the combined first multi-wavelength optical signal carries multiple wavelengths. For example... Figure 1 The thick solid line between the transmitter chip 110 and the transmitter port 130 indicates that the first multi-wavelength optical signal is transmitted from the transmitter chip 110 to the transmitter port 130.

[0035] In this embodiment, multiple second-wavelength optical signals of different wavelengths are input to the receiving chip 120 and used as local oscillator light. After receiving a beam of second multi-wavelength optical signal with multiple wavelengths through the receiving port 140, the receiving chip 120 first splits the second multi-wavelength optical signal into multiple demodulated optical signals of different wavelengths. Then, each wavelength of demodulated optical signal is mixed with the corresponding wavelength of local oscillator light to achieve signal demodulation. Figure 1 The thick solid line between the receiver chip 120 and the receiver port 140 indicates that the second multi-wavelength optical signal is transmitted from the transmitter port 130 to the transmitter chip 110.

[0036] It should be noted that the first multi-wavelength optical signal and the second multi-wavelength optical signal mentioned above are both optical signals with multiple different wavelengths and carrying data information. The first multi-wavelength optical signal is generated at this end and then output to the external module through the transmitting port 130, that is, the optical signal output to the outside; the second multi-wavelength optical signal is generated by the external module and input to the receiving port 140, that is, the optical signal input to the outside.

[0037] In this embodiment, the transmitter chip 110 and the receiver chip 120 can be independent silicon-based photonic chips. This transceiver separation design allows the transmitting and receiving functions to be implemented on two independent chips, thereby effectively reducing thermal interference and electrical crosstalk between the two and improving system stability. Transceiver separation can also reduce the chip area, which is beneficial for mass production of chips and thus reduces costs.

[0038] In one embodiment, the receiver chip 120 integrates multiple mixers, each corresponding to a different wavelength. The second split signal and the signal to be demodulated are input into the corresponding mixer according to their wavelengths for mixing.

[0039] In this way, the second split signal and the signal to be demodulated with the same wavelength will be input into the same mixer. Each mixer will use the received second split signal as the local oscillator and perform mixing processing with the received signal to be demodulated.

[0040] In one embodiment, the transmitter chip 110 integrates a multiplexer for combining multiple modulated optical signals of different wavelengths into a first multi-wavelength optical signal.

[0041] In this embodiment, the modulated optical signal obtained after signal modulation in the transmitter chip 110 is input into the multiplexer, which combines multiple modulated optical signals of different wavelengths into a first multi-wavelength optical signal and outputs it to the transmitter port 130.

[0042] In one embodiment, a demultiplexer is integrated on the receiver chip 120, which is used to divide the second multi-wavelength optical signal into multiple demodulated optical signals of different wavelengths.

[0043] In this embodiment, the second multi-wavelength optical signal is an optical signal with multiple different wavelengths. The receiver chip 120 can separate the second multi-wavelength optical signal into multiple optical signals to be demodulated with different wavelengths through a demultiplexer. Then, the multiple optical signals to be demodulated with different wavelengths are input into the corresponding mixers according to their wavelengths and mixed with the local oscillator light.

[0044] It should be noted that both the multiplexer and demultiplexer in this embodiment can be implemented using an optical wavelength division multiplexer. That is, based on the reversibility of the optical path, the optical wavelength division multiplexer can be used as both a multiplexer and a demultiplexer.

[0045] In one implementation, please refer to Figure 2 The transmitter chip 110 and receiver chip 120 can be independently mounted on the PCB board 160, and the light source module 150 is connected to the PCB board 160 via the FPC board 170. The PCB board 160 is a printed circuit board, and the FPC board 170 is a flexible circuit board.

[0046] In this embodiment, the transmitter chip 110 and the receiver chip 120 are independently packaged and disposed on the same PCB board 160, achieving physical isolation between the transmitting and receiving functions. The light source module 150 is connected to the PCB board 160 via an FPC board 170. This design, which separates the light source module 150 from the transmitter chip 110 and the receiver chip 120, allows the light source module 150 to be coupled and tested independently, reducing manufacturing difficulty.

[0047] In one implementation, please refer to Figure 3 The light source module 150 includes multiple light emitting components 151, each of which includes a laser 1511, an isolator 1512, and a beam splitter 1513.

[0048] Isolator 1512 is disposed between laser 1511 and beam splitter 1513 to isolate optical noise. By disposing of isolator 1512 between laser 1511 and beam splitter 1513, noise caused by reflected light can be effectively suppressed.

[0049] Laser 1511 is used to generate an initial optical signal of a fixed wavelength; the initial optical signal passes through isolator 1512 and reaches beam splitter 1513; the initial optical signals output by lasers 1511 in different optical emitting components 151 have different wavelengths. In this way, multiple initial optical signals of different wavelengths can be generated by different lasers 1511.

[0050] The beam splitter 1513 is used to split the received initial optical signal to obtain a first split signal and a second split signal.

[0051] In this embodiment, the beam splitter 1513 may include two beam splitting prisms. By reflecting and projecting part of the light according to a set ratio through the two beam splitting prisms, an initial optical signal can be split into two paths (i.e., a first beam splitting signal and a second beam splitting signal), which are then transmitted to the transmitter chip 110 and the receiver chip 120, respectively.

[0052] In one implementation, please refer to [link / reference]. Figure 3 Each light emitting component 151 also includes a semiconductor cooler 1514, and the laser 1511, isolator 1512 and beam splitter 1513 are all disposed on the semiconductor cooler 1514; the semiconductor cooler 1514 is used to control the temperature of the laser 1511.

[0053] In this embodiment, by setting a semiconductor cooler 1514 to control the temperature of the laser 1511, the wavelength adjustment and wavelength stabilization of the output optical signal of the laser 1511 can be achieved.

[0054] In one implementation, please refer to [link / reference]. Figure 3 The light source module 150 includes multiple output port groups 152, each output port group 152 including a first output port 1521 and a second output port 1522; the first output port 1521 is connected to the transmitter chip 110, and the second output port 1522 is connected to the receiver chip 120.

[0055] The first output port 1521 is used to output the first split signal, and the second output port 1522 is used to output the second split signal.

[0056] In other words, each light emitting component 151 in the light source module 150 corresponds to an output port group 152. The first split signal obtained by the beam splitter 1513 in each light emitting component 151 is output to the transmitter chip 110 through the first output port 1521 in the corresponding output port group 152; the second split signal obtained by the beam splitter 1513 in each light emitting component 151 is output to the receiver chip 120 through the second output port 1522 in the corresponding output port group 152.

[0057] In one implementation, please refer to Figure 4 The multi-wavelength coherent optical module 100 also includes a transmitter fiber array 180 and a receiver fiber array 190. The transmitter port 130 and the light source module 150 are both connected to the transmitter chip 110 through the transmitter fiber array 180, and the receiver port 140 and the light source module 150 are both connected to the receiver chip 120 through the receiver fiber array 190.

[0058] The transmitting fiber array 180 and the receiving fiber array 190 are also mounted on the PCB board 160.

[0059] The transmitting fiber array 180 is used to couple the first split signal output by the light source module 150 to the transmitting chip 110, and to output the first multi-wavelength optical signal synthesized by the transmitting chip 110 to the transmitting port 130; the receiving fiber array 190 is used to couple the second split signal output by the light source module 150 to the receiving chip 120, and to couple the second multi-wavelength optical signal received by the receiving port 140 to the receiving chip 120.

[0060] In this embodiment, the light source module 150 and the transmitting fiber array 180, the light source module 150 and the receiving fiber array 190, the transmitting port 130 and the transmitting fiber array 180, and the receiving port 140 and the receiving fiber array 190 can be connected by optical fibers.

[0061] Thus, the first split signal output from the first output port 1521 of the light source module 150 passes through the optical fiber to the transmitter fiber array 180, and is coupled to the transmitter chip 110 by the transmitter fiber array 180. After signal modulation in the transmitter chip 110, the first multi-wavelength optical signal is synthesized by the internal multiplexer. The first multi-wavelength optical signal is then output to the transmitter port 130 through the transmitter fiber array 180 and the optical fiber.

[0062] Similarly, the second split signal output from the second output port 1522 of the light source module 150 passes through an optical fiber to the receiving end fiber array 190, is coupled from the receiving end fiber array 190 to the receiving end chip 120, and is then input into the corresponding mixer as the local oscillator light; the second multi-wavelength optical signal received by the receiving port 140 passes through an optical fiber to the receiving end fiber array 190, is coupled from the receiving end fiber array 190 to the receiving end chip 120, and is then split into multiple demodulated optical signals of different wavelengths by the demultiplexer inside the receiving end chip 120. Each demodulated optical signal is input into the corresponding mixer according to its wavelength and mixed with the local oscillator light.

[0063] In summary, the multi-wavelength coherent optical module provided by this invention achieves physical separation of transmission and reception functions by separating the transmitter chip and receiver chip, effectively avoiding thermal interference and electrical crosstalk, and improving system stability. Furthermore, this separation design results in smaller chip areas, reduced wiring complexity, and improved processing yield, which is beneficial for mass production and thus significantly reduces production costs. By employing an independent light source module integrating multiple lasers, the fixed-wavelength optical signal emitted by each laser is split into two paths and output to the transmitter chip and receiver chip respectively, achieving efficient sharing of multi-wavelength resources between the transmission and reception paths and improving light source utilization. This multi-wavelength coherent optical module has high integration and scalability, supporting multi-wavelength parallel transmission such as 2×400G and 2×800G, and is easy to upgrade to high-speed optical modules such as 1.6T / 3.2T.

[0064] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A multi-wavelength coherent optical module, characterized in that, It includes a transmitter chip, a receiver chip, a transmitter port, a receiver port, and a light source module. The transmitter port and the light source module are both connected to the transmitter chip, and the receiver port and the light source module are both connected to the receiver chip. The transmitter chip and the receiver chip are independent silicon-based photonic chips, and the light source module is independent of the transmitter chip and the receiver chip. The light source module is used to generate multiple initial light signals of different wavelengths, and split each initial light signal into a first split signal and a second split signal, which are then transmitted to the transmitting chip and the receiving chip, respectively. The transmitter chip is used to modulate the first split optical signals of each received wavelength to obtain the corresponding modulated optical signals; and to synthesize the multiple modulated optical signals of different wavelengths into a first multi-wavelength optical signal and output it to the transmitter port. The receiving chip is used to take the second split signal of each wavelength as the local oscillator light; to divide the second multi-wavelength optical signal received through the receiving port into multiple demodulated optical signals of different wavelengths; and to perform frequency mixing processing on each wavelength demodulated optical signal and the local oscillator light of the corresponding wavelength.

2. The multi-wavelength coherent optical module according to claim 1, characterized in that, The light source module includes multiple light emitting components, each of which includes a laser, an isolator, and a beam splitter; The isolator is disposed between the laser and the beam splitter to isolate optical noise; The laser is used to generate an initial optical signal with a fixed wavelength; the initial optical signal passes through the isolator and reaches the beam splitter; the initial optical signal output by the lasers in different optical emitting components has a different wavelength; The beam splitter is used to split the received initial optical signal to obtain the first split signal and the second split signal.

3. The multi-wavelength coherent optical module according to claim 2, characterized in that, Each of the optical emitting components further includes a semiconductor cooler, and the laser, the isolator and the beam splitter are all disposed on the semiconductor cooler; The semiconductor cooler is used to control the temperature of the laser.

4. The multi-wavelength coherent optical module according to claim 1, characterized in that, The light source module includes multiple output port groups, each output port group including a first output port and a second output port; the first output port is connected to the transmitter chip, and the second output port is connected to the receiver chip; The first output port is used to output the first split signal, and the second output port is used to output the second split signal.

5. The multi-wavelength coherent optical module according to claim 1, characterized in that, The multi-wavelength coherent optical module further includes a transmitter fiber array and a receiver fiber array. The transmitter port and the light source module are both connected to the transmitter chip through the transmitter fiber array, and the receiver port and the light source module are both connected to the receiver chip through the receiver fiber array. The transmitting fiber array is used to couple the first split signal output by the light source module to the transmitting chip, and to output the first multi-wavelength optical signal synthesized by the transmitting chip to the transmitting port; The receiving fiber array is used to couple the second split signal output by the light source module to the receiving chip, and to couple the second multi-wavelength optical signal received by the receiving port to the receiving chip.

6. The multi-wavelength coherent optical module according to claim 1, characterized in that, The transmitter chip integrates a multiplexer, which is used to synthesize the first multi-wavelength optical signal by combining multiple modulated optical signals of different wavelengths.

7. The multi-wavelength coherent optical module according to claim 1, characterized in that, The receiver chip integrates a demultiplexer, which is used to divide the second multi-wavelength optical signal into multiple demodulated optical signals of different wavelengths.

8. The multi-wavelength coherent optical module according to claim 1, characterized in that, The receiver chip integrates multiple mixers, each corresponding to a different wavelength. The second split signal and the signal to be demodulated are input into the corresponding mixers according to their wavelengths for mixing.

9. The multi-wavelength coherent optical module according to any one of claims 1-8, characterized in that, The transmitter chip and the receiver chip are independently mounted on the PCB board.

10. The multi-wavelength coherent optical module according to claim 9, characterized in that, The light source module is connected to the PCB board via an FPC board.

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