Signal processing device of digital coherent optical transceiver module

Abstract

The invention provides a signal processing device of a digital coherent optical transceiver module, comprising: a clock synchronization module for outputting a reference clock signal; the high-speed acquisition module comprises a plurality of high-speed analog-to-digital converters, and the high-speed analog-to-digital converters are respectively used for receiving the reference clock signal and the optical signal sent by the digital coherent optical transceiver module and sampling the received electric signal based on the received reference clock signal to obtain a sampling signal; the signal processing module is used for receiving the reference clock signal and each sampling signal, and processing each received sampling signal according to a preset processing mode based on the reference clock signal to obtain a target signal corresponding to each sampling signal; and the signal forwarding module is used for receiving the target signals, sending the received target signals to external equipment and efficiently processing the data signals sent by the digital coherent optical transceiver module.

Description

Technical Field

[0001] The invention relates to the technical field of laser ground communication, and in particular to a signal processing device of a digital coherent optical transceiver module. Background Art

[0002] With the development of intersatellite and satellite-to-ground laser communications, the demand for space wireless laser communications is also increasing. Compared with traditional wired laser communications, the use environment of space wireless laser communications is more complex and demanding. For example, in the space environment, it may face problems such as dispersion and atmospheric turbulence. Therefore, it is necessary to fully simulate and verify the space environment.

[0003] At present, the intersatellite high-speed communication simulation system is generally used to simulate the space laser communication environment, so as to provide real-time, reliable and high-speed integrated communication services for space wireless laser communication. Specifically, the intersatellite high-speed communication simulation system can receive the data signal sent by the digital coherent optical transceiver module, process the data signal, and then forward it to the external device.

[0004] However, the data signal sent by the digital coherent optical transceiver module simulates the laser signal on the satellite. The data signal has an extremely high transmission rate and carries a large amount of data. The intersatellite high-speed communication simulation system cannot efficiently process these data signals and cannot meet actual needs. Summary of the invention

[0005] The present invention provides a signal processing device for a digital coherent optical transceiver module, which is used to solve the technical problem in the prior art that a data signal sent by the digital coherent optical transceiver module cannot be efficiently processed.

[0006] In one aspect, the present invention provides a signal processing device for a digital coherent optical transceiver module, comprising: A clock synchronization module, used for outputting a reference clock signal; A high-speed acquisition module, comprising a plurality of high-speed analog-to-digital converters, each of which is used to receive the reference clock signal and the optical signal sent by the digital coherent optical transceiver module, and to sample the received electrical signal based on the received reference clock signal to obtain a sampled signal; A signal processing module, configured to receive the reference clock signal and each of the sampling signals, and process each of the received sampling signals according to a preset processing method based on the reference clock signal to obtain a target signal corresponding to each of the sampling signals; The signal forwarding module is used to receive each of the target signals and send each received target signal to an external device.

[0007] According to a signal processing device of a digital coherent optical transceiver module provided by the present invention, the number of the high-speed analog-to-digital converters is 4; The high-speed acquisition module is configured with a single polarization mode and a dual polarization mode; The high-speed acquisition module provides two input channels in the single polarization mode; The high-speed acquisition module provides four input channels in the dual-polarization mode.

[0008] According to a signal processing device of a digital coherent optical transceiver module provided by the present invention, the preset processing method includes: Demodulation processing, decoding processing and descrambling processing; The demodulation process includes four-phase shift keying, two-phase shift keying and on-off keying.

[0009] According to a signal processing device of a digital coherent optical transceiver module provided by the present invention, the signal processing module includes a DDR4 data buffer, and the bandwidth supported by the DDR4 data buffer is greater than or equal to 60Gbps; The signal processing module is configured with a PCIe 3.0 x8 interface, and the maximum data transmission rate supported by the PCIe 3.0 x8 interface is 60 Gbps.

[0010] According to a signal processing device of a digital coherent optical transceiver module provided by the present invention, the wavelength of the electrical signal output by the signal forwarding module is 850nm, the transmission rate is 10Gbps, and the transmission distance is 280-320M.

[0011] According to a signal processing device of a digital coherent optical transceiver module provided by the present invention, the maximum frequency of the electrical signal collected by the high-speed acquisition module is 18 GHz, the sampling accuracy is 8 bits, the sampling rate is 40 GSps, and calibration between each input channel is achieved with the signal processing module.

[0012] According to a signal processing device of a digital coherent optical transceiver module provided by the present invention, the calibration includes at least one of the following: Clock calibration, gain calibration, offset calibration, phase calibration and channel balance.

[0013] A signal processing device for a digital coherent optical transceiver module provided by the present invention further includes: The monitoring module is used to monitor the working status of the signal processing module.

[0014] According to a signal processing device of a digital coherent optical transceiver module provided by the present invention, the monitoring module comprises: A status monitoring unit, used to monitor the operating status and performance parameters of the signal processing module; A fault diagnosis unit, configured to perform fault diagnosis on the abnormal state when an abnormal state is detected in the operating state, and provide a diagnosis result; an alarm unit, configured to send out an alarm signal when the fault diagnosis unit determines that an abnormal state exists in the operating state; A control unit is used to control the signal processing module to eliminate faults according to the diagnosis result.

[0015] According to a signal processing device of a digital coherent optical transceiver module provided by the present invention, the signal processing module is also used to perform I / Q delay correction and imbalance correction on the received sampling signal before processing the received sampling signal according to a preset processing method.

[0016] The signal processing device of the digital coherent optical transceiver module provided by the present invention comprises a high-speed acquisition module including a plurality of high-speed analog-to-digital converters, each of which is used to receive a reference clock signal and an optical signal sent by the digital coherent optical transceiver module, and samples the received electrical signal based on the received reference clock signal to obtain a sampled signal; the signal processing module is used to receive the reference clock signal and each sampled signal, and processes each received sampled signal according to a preset processing method based on the reference clock signal to obtain a target signal corresponding to each sampled signal; the signal forwarding module is used to receive each target signal and send each received target signal to an external device, thereby realizing the simultaneous processing of multiple optical signals sent by the digital coherent optical transceiver module, greatly improving the processing efficiency and data throughput, and the parallel processing capability can quickly respond to and process a large amount of data to meet the needs of high-speed communication, and can still maintain some functions when some ADCs fail, thereby improving reliability and robustness. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is one of the structural schematic diagrams of the signal processing device of the digital coherent optical transceiver module provided in an embodiment of the present invention; Figure 2 This is a second structural schematic diagram of a signal processing device for a digital coherent optical transceiver module provided in an embodiment of the present invention; Figure 3 1 is a schematic diagram of the architecture of a signal processing device for a digital coherent optical transceiver module provided by an embodiment of the present invention; Figure 4is a schematic diagram of a single polarization process provided by an embodiment of the present invention; Figure 5 It is a schematic diagram of the dual polarization process provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Figure 1 This is one of the structural schematic diagrams of the signal processing device of the digital coherent optical transceiver module provided in an embodiment of the present invention; Figure 2 This is a second structural schematic diagram of a signal processing device for a digital coherent optical transceiver module provided in an embodiment of the present invention; Figure 3 Schematic diagram of the architecture of the signal processing device of the digital coherent optical transceiver module provided by the embodiment of the present invention. The signal processing device can be used at the ground end and can be used as an inter-satellite high-speed communication simulation system to receive the laser signal transmitted by the satellite. The digital coherent optical transceiver module can be used to simulate the laser signal transmitted by the satellite.

[0021] See also Figures 1 to 3 The signal processing device 10 of the digital coherent optical transceiver module may include a clock synchronization module 102 , a high-speed acquisition module 103 , a signal processing module 104 and a signal forwarding module 105 .

[0022] The clock synchronization module 102 is used to output a reference clock signal.

[0023] The high-speed acquisition module 103 includes a plurality of high-speed analog-to-digital converters (ADCs), each of which is used to receive a reference clock signal and an optical signal sent by the digital coherent optical transceiver module, and to sample the received electrical signal based on the received reference clock signal to obtain a sampled signal. It can be understood that each ADC is capable of receiving a reference clock signal and an optical signal sent by the digital coherent optical transceiver module, and to sample the received electrical signal based on the received reference clock signal to obtain a sampled signal, thereby ensuring high precision and high sampling rate of the signal, thereby improving the performance of signal processing.

[0024] The signal processing module 104 is used to receive the reference clock signal and each sampling signal, and processes each received sampling signal according to a preset processing method based on the reference clock signal to obtain a target signal corresponding to each sampling signal. It can be understood that this design helps to improve the real-time and accuracy of signal processing and ensure high-quality transmission of signals.

[0025] The signal forwarding module 105 is used to receive each target signal and send the received target signal to an external device.

[0026] In this embodiment, the high-speed acquisition module 103 includes multiple high-speed analog-to-digital converters, each of which is used to receive a reference clock signal and an optical signal sent by the digital coherent optical transceiver module, and samples the received electrical signal based on the received reference clock signal to obtain a sampling signal; the signal processing module 104 is used to receive the reference clock signal and each sampling signal, and processes each received sampling signal according to a preset processing method based on the reference clock signal to obtain a target signal corresponding to each sampling signal; the signal forwarding module 105 is used to receive each target signal and send each received target signal to an external device, thereby realizing the simultaneous processing of multiple optical signals sent by the digital coherent optical transceiver module, greatly improving the processing efficiency and data throughput, and this parallel processing capability can quickly respond to and process a large amount of data to meet the needs of high-speed communication, and can still maintain some functions when some ADCs fail, thereby improving reliability and robustness.

[0027] In one embodiment of this specification, the number of the high-speed analog-to-digital converters is 4; The high-speed acquisition module 103 is configured with a single polarization mode and a dual polarization mode; The high-speed acquisition module 103 provides two input channels in the single polarization mode; The high-speed acquisition module 103 provides four input channels in the dual-polarization mode.

[0028] In this embodiment, the single polarization mode means that the optical signal is transmitted in only one polarization direction. This mode is suitable for short-distance transmission because the change of the polarization state is small in a short distance, and a high symbol rate can be maintained, thereby improving the transmission efficiency. In the single polarization mode, the high-speed acquisition module 103 can provide two input channels, which is suitable for short optical fiber transmission of optical signals. The system maintains polarization and has a higher symbol rate.

[0029] See also Figure 4, the two AD input channels receive the signals sent by the digital coherent optical transceiver module respectively, and then perform preprocessing, timing synchronization, equalization, carrier synchronization, frame synchronization, descrambling and decoding on the received signals, and then they can be sent to the client side. Among them, preprocessing: refers to the preliminary processing of the received analog signal before the signal enters the digital signal processor (DSP) to improve the signal quality, which usually includes amplification, filtering and normalization. Timing synchronization: the process of ensuring that the receiving end can correctly identify the starting position of each code element, which is crucial for correct sampling judgment. It involves eliminating the time error caused by the clock frequency offset and phase jitter of the transceiver to ensure the accuracy of the sampling sequence. Equalization: refers to compensating for the signal spectrum distortion caused by the optical fiber channel. Due to factors such as optical fiber dispersion and polarization mode dispersion, the signal will be distorted during transmission. The equalization process adjusts the signal through an adaptive algorithm to offset these effects. Carrier synchronization: estimates and corrects the carrier frequency and phase of the received signal. Due to the frequency difference between the local oscillator light source and the transmitting laser, as well as the phase offset introduced by the laser line width, the carrier synchronization compensates for these deviations through frequency offset estimation and phase recovery algorithms. Frame synchronization: refers to the receiving end identifying the start and end positions of the signal to determine the frame structure of the signal, which is crucial for correctly parsing the information in the signal. It involves detecting a specific frame synchronization sequence to achieve frame-level synchronization of the signal. Descrambling: refers to the process of signal transmission. Due to the influence of various interferences and noises, the received signal may have errors. The descrambling process attempts to detect and correct these errors through technologies such as error correction codes to restore the original transmitted data. Decoding: Decoding is the conversion of the received signal into original digital data. In coherent optical communication systems, this usually involves mapping the modulated optical signal properties (such as amplitude, phase, and polarization) back to digital data, and performing decoding operations to restore the original information.

[0030] The dual polarization mode means that the optical signal can be transmitted in two orthogonal polarization directions, so that double the amount of data can be transmitted within the same bandwidth. The dual polarization mode is suitable for long-distance transmission because it does not require maintaining a specific polarization state during transmission, which is more practical and economical for long-distance optical fiber transmission. In the dual polarization mode, the high-speed acquisition module 103 provides 4 input channels, which is suitable for long optical fiber transmission signals, and the system does not maintain polarization.

[0031] See also Figure 5, the 4 AD input channels receive the signals sent by the digital coherent optical transceiver module respectively, and then perform preprocessing, timing synchronization, equalization and polarization demultiplexing, carrier synchronization, frame synchronization, descrambling, decoding and data merging on the received signals before sending them to the client side. Among them, polarization demultiplexing can be understood as processing the polarization-multiplexed optical signals at the receiving end to separate signals of different polarization states. Since the polarization state of the optical signal transmitted in the optical fiber link changes randomly, the RSOP (Rotation of State of Polarization) effect is generated. After demultiplexing at the receiving end, two stable optical paths cannot be obtained. It is necessary to control the polarization state at the receiving end to realize demultiplexing. Data merging refers to merging the independent data streams obtained after the above processing steps into a continuous data stream for further processing or transmission. Figure 5 The meaning of the remaining steps can be found in Figure 4 The meaning of the corresponding steps in will not be repeated here.

[0032] By configuring the single polarization mode and the dual polarization mode, the high-speed acquisition module 103 can adapt to different communication requirements and environmental conditions, thereby enhancing flexibility and adaptability. It is understood that the signal processing module 104 can also support the single polarization mode and the dual polarization mode.

[0033] In one embodiment of the present specification, the preset processing method may include: Demodulation processing, decoding processing and descrambling processing; The demodulation process includes four-phase shift keying, two-phase shift keying and on-off keying.

[0034] In this embodiment, demodulation processing refers to the process of restoring the received modulated signal to the original digital signal. In digital coherent optical communication, demodulation processing includes detecting and recovering parameters such as phase, amplitude and polarization of the signal. Demodulation processing includes quadrature phase shift keying (QPSK), binary phase shift keying (BPSK) and on-off keying (OOK). These modulation methods encode information by changing the phase, amplitude and other properties of the optical signal. The demodulation process needs to accurately detect these changes and convert them back to digital signals.

[0035] Decoding refers to the process of converting the demodulated signal into the original data. In coherent optical communication, decoding involves error detection and correction (ECC) algorithms to identify and correct errors that may occur during transmission. Decoding ensures the integrity and accuracy of data and improves the reliability of communication.

[0036] Descrambling refers to eliminating various interferences and influences on the signal during transmission, such as dispersion, multipath effect, phase noise, etc. Descrambling optimizes the signal to reduce the impact of these interferences on signal quality. In coherent optical communication systems, descrambling helps improve signal quality, extend transmission distance and improve system performance.

[0037] In summary, demodulation processing, decoding processing and descrambling processing are three indispensable links in the digital coherent optical transceiver module signal processing device 10, which together ensure accurate reception and high-quality transmission of signals.

[0038] In one embodiment of the present specification, the preset processing method may include: The signal processing module 104 includes a DDR4 data buffer, and the bandwidth supported by the DDR4 data buffer is greater than or equal to 60 Gbps; The signal processing module 104 is configured with a PCIe 3.0 x8 interface, and the maximum data transmission rate supported by the PCIe 3.0 x8 interface is 60 Gbps.

[0039] In this embodiment, the bandwidth supported by the DDR4 data buffer is greater than or equal to 60Gbps, which can provide high-bandwidth performance, facilitate the processing of large amounts of data and high-speed data transmission, and significantly improve data processing capabilities. The maximum data transmission rate supported by the PCIe 3.0 x8 interface is 60Gbps, which makes the signal processing module 104 compatible with a variety of high-speed devices and has good scalability. PCIe 3.0 can use 128b / 130b encoding, which effectively reduces errors in the data transmission process and improves the efficiency and reliability of the signal. The signal processing module 104 can also be configured with an interface above PCIe 3.0 x8.

[0040] In one embodiment of the present specification, the wavelength of the electrical signal output by the signal forwarding module 105 is 850nm, the transmission rate is 10Gbps, and the transmission distance is 280-320M.

[0041] In this embodiment, the signal forwarding module 105 supports a data transmission rate of up to 10Gbps, which can meet the needs of high-speed networks. The transmission distance is 280-320 meters, which is suitable for short-distance high-speed connection scenarios such as data center internal and enterprise network wiring, reducing wiring complexity and improving flexibility. The wavelength is 850nm, which has higher compatibility and is compatible with multimode optical fiber (MMF), which allows them to be used with existing optical fiber infrastructure without replacing optical fiber, thereby saving upgrade costs.

[0042] In one embodiment of the present specification, the high-speed acquisition module 103 acquires electrical signals at a maximum frequency of 18 GHz, a sampling accuracy of 8 bits, a sampling rate of 40 GSps, and implements calibration between input channels with the signal processing module 104 .

[0043] In this embodiment, the maximum frequency of the electrical signal collected by the high-speed acquisition module 103 is 18 GHz, which is convenient for supporting data transmission with a wider bandwidth; the 8-bit sampling accuracy provides 256 quantization levels, which helps to more accurately represent the amplitude changes of the signal, thereby improving the quality of signal processing; the sampling rate is 40GSps (Giga Samples per second), which ensures that the Nyquist sampling theorem can be met in high-speed signal acquisition, avoiding aliasing, and capturing rapid changes in the signal.

[0044] In one embodiment of the present specification, the calibration includes at least one of the following: Clock calibration, gain calibration, offset calibration, phase calibration and channel balance.

[0045] In this embodiment, clock calibration refers to adjusting the clock signal in the signal processing module 104 to ensure the synchronization of sampling and data processing. In the digital coherent optical transceiver module, clock calibration can ensure that the sampling clock of the analog-to-digital converter (ADC) is accurately aligned with the processing clock in the signal processing module 104, thereby reducing the error caused by clock deviation. Clock calibration can be achieved through technologies such as digital phase-locked loop (PLL) or digital phase-locked loop (DPLL) to dynamically adjust the clock frequency and phase to ensure the stability and accuracy of the clock signal.

[0046] Gain calibration refers to adjusting the amplifier gain in the signal processing module 104 to compensate for the gain differences between different channels or different devices. In a digital coherent optical transceiver module, gain calibration can ensure that the signal maintains a consistent amplitude level after analog-to-digital conversion and subsequent processing, which is conducive to accurate demodulation and decoding of the signal. Gain calibration is usually achieved by adjusting the quantization step size of the ADC or the gain control parameters in the digital signal processing (DSP).

[0047] Offset calibration refers to adjusting the DC offset in the signal processing module 104 to eliminate the DC component in the signal. In a digital coherent optical transceiver module, offset calibration can reduce the DC offset caused by hardware imperfections or environmental factors, which is very important for improving the signal-to-noise ratio and accuracy of the signal.

[0048] Phase calibration refers to adjusting the phase in the signal processing module 104 to ensure the phase consistency of the signal. In the digital coherent optical transceiver module, phase calibration is conducive to maintaining the coherence of the signal and achieving accurate signal demodulation. Phase calibration can be achieved by adjusting the phase compensation parameters in the DSP to compensate for the phase deviation caused by optical fiber transmission or hardware mismatch.

[0049] Channel balancing refers to adjusting multiple input channels in the signal processing module 104 to ensure that the signal characteristics between each channel are consistent. In a digital coherent optical transceiver module, channel balancing can ensure that the signals of different channels have the same amplitude and phase characteristics after processing, which is conducive to the efficient merging and transmission of multi-channel signals. Channel balancing is usually achieved by adjusting the gain, offset and phase parameters of each channel to compensate for the differences between channels.

[0050] In one embodiment of the present specification, the signal processing device 10 of the digital coherent optical transceiver module further includes: The monitoring module 106 is used to monitor the working status of the signal processing module 104 .

[0051] Specifically, the monitoring module 106 includes: A state monitoring unit, used to monitor the operating state and performance parameters of the signal processing module 104; A fault diagnosis unit, configured to perform fault diagnosis on the abnormal state when an abnormal state is detected in the operating state, and provide a diagnosis result; an alarm unit, configured to send out an alarm signal when the fault diagnosis unit determines that an abnormal state exists in the operating state; A control unit is used to control the signal processing module 104 to eliminate the fault according to the diagnosis result.

[0052] In this embodiment, the monitoring module 106 is used to realize status monitoring, fault diagnosis, alarm and control, realizes comprehensive management, can realize real-time analysis and quality measurement of baseband data and demodulation data, and has a high level of intelligence. Through monitoring, it can be known that the bit error rate of the present invention is very low. For example, the bit error rate is 10 -9 about.

[0053] In one embodiment of the present specification, the signal processing module 104 is further used to perform I / Q delay correction and imbalance correction on the received sampled signal before processing the received sampled signal according to a preset processing method.

[0054] In this embodiment, I / Q delay correction and imbalance correction are performed on the received sampling signal to achieve zero intermediate frequency. Compared with the intermediate frequency solution, the ADC sampling rate can be significantly reduced, and the system's dependence on high-performance ADC is reduced.

[0055] In an embodiment of the present specification, I / Q delay correction may specifically include identifying delay differences and adjusting sampling moments.

[0056] Identify delay differences: The delay differences between the I (in-phase) and Q (quadrature) channels need to be identified, for example, by sending a known test signal or using an adaptive algorithm to estimate the delay differences.

[0057] Adjust the sampling time: According to the identified delay difference, adjust the sampling time of the ADC so that the sampling of the I and Q channels is synchronized. For example, the clock phase of the ADC can be adjusted or digital signal processing technology can be used to compensate for the delay.

[0058] In one embodiment of the present specification, imbalance correction may include gain and offset correction, amplitude balance and phase balance.

[0059] Gain and offset correction: Adjust the gain and offset of the I and Q channels to compensate for the amplitude and phase imbalance between the two channels. Specifically, for example, this can be achieved by measuring the DC offset and gain difference of the I and Q channels and applying the corresponding correction coefficients.

[0060] Amplitude balance: adjust the amplitude of the I and Q channels to ensure that the amplitude responses of the I and Q channels are equal. Specifically, for example, this can be achieved by adjusting the gain of the amplifier.

[0061] Phase balance: Adjust the phase of the I and Q channels to ensure that the phase response of the I and Q channels is consistent. Specifically, for example, adjust the phase delay line or use digital signal processing technology to compensate for the phase difference.

[0062] In an embodiment of the present specification, the signal processing device 10 may further include an optoelectronic conversion module. The optoelectronic conversion module is used to receive the optical signal sent by the digital coherent optical transceiver module and convert the optical signal into an electrical signal.

[0063] The high-speed acquisition module 103 is used to receive the electrical signal and the reference clock signal, and sample the received electrical signal based on the received reference clock signal to obtain a sampled signal.

[0064] The signal forwarding module 105 is used to receive the target signal, convert the received target signal into an electrical signal, and send it to an external device.

[0065] In summary, the signal processing device 10 of the digital coherent optical transceiver module of the present invention can also be regarded as a circuit, which may include but is not limited to a field programmable gate array (FPGA), an analog-to-digital converter (AD), a static random access memory (SRAM), a magnetic random access memory (MRAM), a small form-factor pluggable module (SFP), a network interface connector (such as RJ45), a clock circuit and an interface circuit, etc., and can be used for processing multi-channel high-speed acquisition signals. See Figure 2 The signal processing device 10 may include a substrate, on which the clock synchronization module 102, the high-speed acquisition module 103, the signal processing module 104, the signal forwarding module 105 and the monitoring module 106 are all arranged. The clock synchronization module 102, the high-speed acquisition module 103 and the signal processing module 104 may be connected by signals to communicate with each other. The signal processing module 104, the signal forwarding module 105 and the monitoring module 106 may also be connected by signals to communicate with each other.

[0066] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0067] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A signal processing device for a digital coherent optical transceiver module, characterized in that: include: A clock synchronization module, used for outputting a reference clock signal; A high-speed acquisition module, comprising a plurality of high-speed analog-to-digital converters, each of which is used to receive the reference clock signal and the optical signal sent by the digital coherent optical transceiver module, and to sample the received electrical signal based on the received reference clock signal to obtain a sampled signal; A signal processing module, configured to receive the reference clock signal and each of the sampling signals, and process each of the received sampling signals according to a preset processing method based on the reference clock signal to obtain a target signal corresponding to each of the sampling signals; The signal forwarding module is used to receive each of the target signals and send each received target signal to an external device.

2. The signal processing device of the digital coherent optical transceiver module according to claim 1, characterized in that: The number of the high-speed analog-to-digital converters is 4; The high-speed acquisition module is configured with a single polarization mode and a dual polarization mode; The high-speed acquisition module provides two input channels in the single polarization mode; The high-speed acquisition module provides four input channels in the dual-polarization mode.

3. The signal processing device of the digital coherent optical transceiver module according to claim 1, characterized in that: The preset processing methods include: Demodulation processing, decoding processing and descrambling processing; The demodulation process includes four-phase shift keying, two-phase shift keying and on-off keying.

4. The signal processing device of the digital coherent optical transceiver module according to claim 1, characterized in that: The signal processing module includes a DDR4 data buffer, and the bandwidth supported by the DDR4 data buffer is greater than or equal to 60 Gbps; The signal processing module is configured with a PCIe 3.0 x8 interface, and the maximum data transmission rate supported by the PCIe 3.0 x8 interface is 60 Gbps.

5. The signal processing device of the digital coherent optical transceiver module according to claim 1, characterized in that: The signal forwarding module outputs an electrical signal with a wavelength of 850nm, a transmission rate of 10Gbps, and a transmission distance of 280-320M.

6. The signal processing device of the digital coherent optical transceiver module according to claim 1, characterized in that: The high-speed acquisition module collects electrical signals at a maximum frequency of 18 GHz, a sampling accuracy of 8 bits, and a sampling rate of 40 GSps, and implements calibration between input channels with the signal processing module.

7. The signal processing device of the digital coherent optical transceiver module according to claim 6, characterized in that: The calibration includes at least one of the following: Clock calibration, gain calibration, offset calibration, phase calibration and channel balance.

8. The signal processing device of the digital coherent optical transceiver module according to claim 1, characterized in that: Also includes: The monitoring module is used to monitor the working status of the signal processing module.

9. The signal processing device of the digital coherent optical transceiver module according to claim 8, characterized in that: The monitoring module comprises: A status monitoring unit, used to monitor the operating status and performance parameters of the signal processing module; A fault diagnosis unit, configured to perform fault diagnosis on the abnormal state when an abnormal state is detected in the operating state, and provide a diagnosis result; an alarm unit, configured to send out an alarm signal when the fault diagnosis unit determines that an abnormal state exists in the operating state; A control unit is used to control the signal processing module to eliminate faults according to the diagnosis result.

10. The signal processing device of the digital coherent optical transceiver module according to claim 1, characterized in that: The signal processing module is also used to perform I / Q delay correction and imbalance correction on the received sampled signal before processing the received sampled signal according to a preset processing method.

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