Optical communication system and method for frequency offset adjustment

Abstract

The invention belongs to the technical field of optical communication, and particularly relates to a frequency offset adjustment optical communication system which comprises a light source module, a modulation module, an optical fiber transmission module, a receiving module, a frequency offset detection module, a digital signal processing module, a feedback control module and a monitoring and control module. The method is applied to the fields of multi-channel dense wavelength division multiplexing optical communication networks, long-distance optical fiber backbone transmission and data center interconnection. The tunable laser and the frequency stabilization control unit are adopted by the light source module, and multi-wavelength signals can be stably output, so that the transmission capacity and the bandwidth utilization rate of the system are remarkably improved, and the signal transmission stability and integrity are remarkably improved. Compared with the prior art, the scheme realizes single-channel 100Gbps stable transmission in a laboratory test, the communication quality is improved by 20%-30%, the system energy efficiency ratio is improved by 15%, and the scheme is compatible with a future 400G / 800G high-speed communication standard.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical communication, and is applied to multi-channel dense wavelength division multiplexing optical communication networks, long-distance optical fiber backbone transmission, and data center interconnection fields. Specifically, it refers to an optical communication system for frequency offset adjustment and its method. Background Art

[0002] The link tracing system aims to monitor the connections and invocations between various key operations or functions in a software system. The core of such a system lies in tracing the propagation path of a specific operation or request within the system to identify the links in the system and establish the associations between them. However, traditional link tracing systems are usually limited to the monitoring and tracing of specific operations, and may not be able to completely and accurately capture all complex operation links in the system, resulting in limitations in problem location or system optimization.

[0003] At the same time, the anomaly capture system is used to detect and record the abnormal situations that occur in the system. These anomalies may include incorrect operations, unexpected results, or performance issues. Existing systems usually rely on post-mortem analysis and cannot accurately capture anomalies in real time and quickly locate the problem, resulting in time-consuming and complex system troubleshooting and repair.

[0004] Therefore, although existing link tracing and anomaly capture systems provide useful information in monitoring and problem location, they have limitations and deficiencies. The present invention is committed to providing an improved system to overcome the limitations of existing systems and provide a more superior link tracing and anomaly capture mechanism in terms of real-time performance, comprehensiveness, and accuracy. By improving the challenges and limitations of existing systems, the new system aims to bring more efficient and reliable monitoring and troubleshooting solutions to the software development and operation and maintenance fields. Summary of the Invention

[0005] In view of the above situation, the present invention provides an optical communication system for frequency offset adjustment.

[0006] The technical solution adopted by the present invention is as follows: The present invention provides an optical communication system for frequency offset adjustment, including:

[0007] Light source module: The tunable laser is used to support multi-wavelength operation;

[0008] Modulation module: Modulates the data signal onto the optical signal;

[0009] Optical fiber transmission module: Responsible for long-distance transmission of the modulated optical signal through the optical fiber;

[0010] Receiving module: Used to convert the received optical signal into an electrical signal;

[0011] Frequency offset detection module: Detects the frequency offset of the optical signal;

[0012] Digital signal processing module: Estimate and compensate the frequency offset of the received signal;

[0013] Feedback control module: Further reduce the frequency offset by feedback regulating the light source or the modulation module;

[0014] Monitoring and control module: Dynamically optimize the frequency offset adjustment parameters according to the detection results.

[0015] Furthermore, the light source module includes:

[0016] Laser unit: Generate an optical signal with a narrow linewidth and high stability;

[0017] Frequency stabilization control unit: Maintain the stability of the laser output frequency;

[0018] Wavelength control unit: Provide precise wavelength adjustment capabilities to support multi-wavelength communication;

[0019] Power control unit: Control the optical signal output power to meet the transmission requirements;

[0020] Optical output coupling unit: Lead out the optical signal generated by the laser to the optical fiber;

[0021] Monitoring and protection unit: Monitor the status of the light source module and protect its normal operation.

[0022] Furthermore, the modulation module includes:

[0023] Electric signal processing unit: Preprocess the input electric signal;

[0024] Modulator unit: Modulate the electric signal onto the optical carrier;

[0025] Bias control unit: Maintain the stability of the modulator operating point;

[0026] Driver circuit unit: Provide a high-frequency electric signal drive for the modulator;

[0027] Signal format generation unit: Generate the modulated electric signal format;

[0028] Optical signal synthesis unit: Synthesize multiple optical signals into a composite signal;

[0029] Optical coupling and output unit: Efficiently couple the modulated optical signal into the optical fiber;

[0030] Monitoring and calibration unit: Real-time monitor the performance of the modulation module.

[0031] Furthermore, the optical fiber transmission module includes:

[0032] Optical fiber unit: Realize the long-distance transmission of optical signals;

[0033] Optical amplifier unit: Compensate for the attenuation of optical signals caused by loss during transmission;

[0034] Dispersion compensation unit: Compensate for the accumulated dispersion in the optical fiber;

[0035] Nonlinear management unit: Mitigate the impact of nonlinear effects in optical fiber transmission;

[0036] Optical isolation and optical circulation unit: Prevent the interference of backward light to the system and support single-fiber bidirectional transmission or multi-channel optical signal distribution; Wavelength division multiplexing unit: Realize the multiplexing and demultiplexing of optical signals with multiple wavelengths;

[0037] Polarization multiplexing unit: Utilize the polarization state of optical signals for multiplexing to increase the channel capacity;

[0038] Optical signal monitoring and feedback unit: Monitor the quality and performance of optical signals in real time and provide a feedback adjustment mechanism;

[0039] Optical switch and protection unit: Provide optical signal switching and protection in case of system failures;

[0040] Environmental control unit: Ensure the stability of the optical fiber transmission module and reduce the impact of environmental factors.

[0041] Furthermore, the frequency offset detection module includes:

[0042] Optoelectronic conversion unit: Convert the received optical signal into an electrical signal to provide a basis for subsequent frequency offset detection;

[0043] Coherent reception unit: Extract the phase and frequency information of the optical signal for frequency offset estimation;

[0044] Digital signal processing unit: Perform frequency offset estimation and analysis on the received signal;

[0045] Local oscillator frequency control unit: Adjust the frequency of the local oscillator light source to approach the frequency of the transmitting light source;

[0046] Phase-locked loop unit: Achieve precise frequency offset tracking and compensation by locking the phase of the received signal;

[0047] Automatic gain control unit: Adjust the level of the received signal;

[0048] Data calibration unit: Calibrate the detected frequency offset value to improve the measurement accuracy;

[0049] Monitoring and output unit: Output the frequency offset detection result and provide monitoring data.

[0050] Furthermore, the digital signal processing module includes:

[0051] Digital signal acquisition unit: samples and quantizes the received analog signal;

[0052] Equalization and channel compensation unit: compensates for channel distortion introduced during signal transmission;

[0053] Frequency offset and phase offset compensation unit: detects and compensates for frequency offset and phase noise caused by laser instability; Timing recovery unit: extracts an accurate sampling clock from the received signal;

[0054] Symbol demodulation unit: demodulates the received digital signal according to the modulation format;

[0055] Data decoding and error correction unit: restores the original bit stream and corrects errors during transmission;

[0056] Signal quality monitoring unit: evaluates the performance and quality of the received signal;

[0057] Signal resynchronization and frame recovery unit: extracts the frame header and synchronization information from the received data stream;

[0058] Digital filtering unit: performs frequency-domain filtering on the received signal to remove noise and interference;

[0059] Power control and normalization unit: adjusts the signal power amplitude to match the requirements of subsequent processing units;

[0060] Higher-order processing unit: supports extended applications.

[0061] Furthermore, the digital signal processing unit adopts a non-linear compensation algorithm, and the specific algorithm formula is as follows:

[0062] Digital backpropagation; used to compensate for fiber non-linearity;

[0063]

[0064] A(z, t): complex envelope of the signal;

[0065] α: attenuation coefficient;

[0066] β 2 : dispersion coefficient;

[0067] γ: non-linear coefficient.

[0068] Furthermore, the equalization and channel compensation unit adopts a linear dispersion compensation algorithm, and the specific algorithm formula is as follows:

[0069] Frequency-domain equalization: used to compensate for fiber dispersion effects;

[0070] Y(f) = X(f) · H(f);

[0071] X(f): frequency-domain representation of the received signal;

[0072] Dispersion compensation filter;

[0073] β 2 : Group velocity dispersion coefficient;

[0074] L: Optical fiber length.

[0075] Furthermore, the frequency offset and phase offset compensation unit adopts a frequency offset compensation algorithm, and the specific algorithm formula is as follows:

[0076] Estimate the frequency offset by detecting the main frequency peak of the received signal;

[0077]

[0078] x(n): Sampling sequence of the received signal;

[0079] N: Number of points of FFT;

[0080] The frequency corresponding to the main frequency peak is the frequency offset Δf;

[0081] Estimate the frequency offset by using the cyclic property;

[0082]

[0083] r(n): Received signal;

[0084] T: Symbol time;

[0085] ∠: Represents the phase angle;

[0086] Estimate the frequency offset by calculating the autocorrelation function of the signal;

[0087]

[0088] The frequency offset is determined by the phase difference between adjacent autocorrelation samples;

[0089]

[0090] This solution also discloses an operation method for an optical communication system with frequency offset adjustment, which mainly includes the following steps:

[0091] Step A1: Initialize the light source module, initialize the tunable laser and set it to support multi-wavelength operation, and select a specific wavelength to work according to the communication requirements;

[0092] Step A2: Generate the modulation signal, and load the input data signal onto the optical signal through the modulator;

[0093] Step A3: Transmit the optical signal, and transmit the modulated optical signal over a long distance through the optical fiber transmission module;

[0094] Step A4: Optical signal reception. In the receiving module, the optical signal is converted into an electrical signal by a photodetector and is preliminarily amplified and filtered.

[0095] Step A5: Frequency offset detection. In the frequency offset detection module, the spectral characteristics of the received electrical signal are analyzed to detect the frequency offset.

[0096] Step A6: Digital signal processing. According to the detected frequency offset, the digital signal processing module estimates and compensates the frequency offset of the signal.

[0097] Step A7: Feedback regulation. The feedback control module adjusts the parameters of the light source module or the modulation module according to the frequency offset detection result.

[0098] Step A8: Monitoring and dynamic optimization. The operating state of the entire system is monitored in real time, and the trend of frequency offset change is recorded.

[0099] Step A9: Output of the compensation signal. The compensated electrical signal is output and converted into a digital signal for transmission.

[0100] Step A10: System calibration and maintenance. The system is calibrated regularly to ensure the parameter consistency of the light source module, the modulation module, and the feedback module.

[0101] The beneficial effects achieved by the present invention with the above structure are as follows: The present invention provides an optical communication system for frequency offset adjustment, achieving the following beneficial effects:

[0102] (1) The light source module adopts a tunable laser and a frequency stabilization control unit, which can stably output multi-wavelength signals to meet the requirements of multi-channel and multi-wavelength in modern optical communication. This significantly improves the transmission capacity and bandwidth utilization rate of the system.

[0103] (2) The frequency offset detection module and the digital signal processing module can accurately detect and compensate the frequency offset and phase noise in the signal.

[0104] (3) The optical fiber transmission module includes an optical fiber unit, an optical amplifier, a dispersion compensation unit, etc., which can effectively compensate for the losses, dispersion, and nonlinear effects of the signal during transmission, improving the stability of long-distance transmission and the signal quality.

[0105] (4) The digital signal processing module can eliminate various distortions generated during optical fiber transmission and restore high-quality signals through multiple processes such as equalization, channel compensation, frequency offset, and phase compensation of the received signal.

[0106] (5) The monitoring and control module can monitor the operating status of the system in real time and optimize parameters according to the detection results to achieve dynamic adaptive adjustment. By adjusting the light source and modulation module, the system can automatically adapt to different environments and working conditions and maintain the optimal working state. Description of the Drawings

[0107] Figure 1 It is a flowchart of an optical communication system for frequency offset adjustment proposed by the present invention;

[0108] Figure 2 It is a schematic diagram of the collaborative process of an optical communication system for frequency offset adjustment proposed by the present invention;

[0109] Figure 3 It is a link tracking and anomaly capture process of an optical communication system for frequency offset adjustment proposed by the present invention.

[0110] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. Detailed Embodiments

[0111] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0112] Embodiment 1:

[0113] Please refer to Figures 1-3 As shown, this embodiment is an optical communication system for frequency offset adjustment, including a light source module, a modulation module, an optical fiber transmission module, a receiving module, a frequency offset detection module, a digital signal processing module, a feedback control module, and a monitoring and control module;

[0114] Among them, the tunable laser in the light source module is used to support multi-wavelength operation;

[0115] Among them, the modulation module modulates the data signal onto the optical signal;

[0116] Among them, the optical fiber transmission module is responsible for long-distance transmission of the modulated optical signal through the optical fiber;

[0117] Among them, the receiving module is used to convert the received optical signal into an electrical signal;

[0118] Among them, the frequency offset detection module detects the frequency offset of the optical signal;

[0119] Among them, the digital signal processing module estimates and compensates the frequency offset of the received signal;

[0120] Among them, the feedback control module further reduces the frequency offset by feedback - regulating the light source or the modulation module;

[0121] Among them, the monitoring and control module dynamically optimizes the frequency - offset adjustment parameters according to the detection results.

[0122] Embodiment 2:

[0123] Please refer to Figures 1-3 As shown, the method of using an optical communication system for frequency - offset adjustment includes the following steps:

[0124] Step A1: Initialize the light - source module, initialize the tunable laser and set it to support multi - wavelength operation, and select a specific wavelength for operation according to communication requirements;

[0125] Step A2: Generate the modulation signal, load the input data signal onto the optical signal through the modulator;

[0126] Step A3: Transmit the optical signal, and the modulated optical signal is transmitted over a long distance through the optical - fiber transmission module;

[0127] Step A4: Receive the optical signal, in the receiving module, the optical signal is converted into an electrical signal by the photodetector and is preliminarily amplified and filtered;

[0128] Step A5: Detect the frequency offset, in the frequency - offset detection module, analyze the spectral characteristics of the received electrical signal and detect the frequency - offset amount;

[0129] Step A6: Digital signal processing, according to the detected frequency offset, the digital signal processing module estimates and compensates the frequency offset of the signal;

[0130] Step A7: Feedback regulation, the feedback control module adjusts the parameters of the light - source module or the modulation module according to the frequency - offset detection results;

[0131] Step A8: Monitoring and dynamic optimization, monitor the operating state of the entire system in real - time and record the trend of frequency - offset changes;

[0132] Step A9: Output the compensated signal, output the compensated electrical signal and convert it into a digital signal for transmission;

[0133] Step A10: System calibration and maintenance, regularly calibrate the system to ensure the parameter consistency of the light - source module, the modulation module and the feedback module.

[0134] Key parameters and implementation methods of the wavelength - selective switch (WSS) in the frequency - offset - adjusted communication system

[0135] WSS Core Parameters and Technical Definitions

[0136] Wavelength Range: The wavelength coverage range of the optical signals supported by the WSS, usually the C band (1530 - 1565 nm) or the L band (1565 - 1625 nm), depending on the device design requirements.

[0137] Implementation Method: By working together with a beam deflection device (such as LCoS) and a beam splitting grating group, the wavelength coverage ability is extended.

[0138] Insertion Loss: The power loss of the optical signal after passing through the WSS, which directly affects the signal-to-noise ratio (SNR) and transmission distance of the system.

[0139] Implementation Method: Optimize the optical path design (such as low-loss lenses, coating technology) and high-reflectivity materials to reduce the insertion loss to ≤7.5 dB.

[0140] Polarization Sensitivity: The response difference of the WSS to optical signals with different polarization states may cause signal distortion.

[0141] Implementation Method: Adopt polarization diversity technology (such as polarization beam splitter + PBS compensation module) to reduce the polarization-dependent loss (PDL) to <0.5 dB.

[0142] Wavelength Accuracy and Control Resolution: The center frequency positioning accuracy of the wavelength channels by the WSS (usually ≤±1 GHz) and the minimum adjustable step size (such as 12.5 GHz / 25 GHz).

[0143] Implementation Method: Combine high-precision LCoS phase modulation algorithms with closed-loop feedback control to achieve sub-GHz wavelength adjustment.

[0144] Switching Time and Stability: The time required for wavelength channel switching (usually <10 ms) and the parameter drift tolerance under long-term operation.

[0145] Implementation Method: Integrate a temperature compensation module (such as TEC temperature control) and an anti-vibration mechanical structure design to ensure environmental adaptability.

[0146] Implementation Scheme of WSS in the Frequency Offset Adjustment System

[0147] Optical Architecture Design:

[0148] Beam Splitting and Combining Module: The input port fiber array receives multi-wavelength signals, which are separated into single-wavelength signals by the beam splitting grating group, and then the optical path direction is dynamically adjusted by the beam deflection device (LCoS) to achieve wavelength selection and cross-connection.

[0149] Dynamic Feedback Mechanism: The output optical power and wavelength offset are detected in real time by the monitoring module and fed back to the control unit to adjust the deflection angle of the LCoS to compensate for the frequency offset and phase noise.

[0150] Control Algorithm and Signal Processing:

[0151] Multi-parameter joint calibration, based on the digital signal processing (DSP) module, synchronously optimizes the wavelength accuracy, insertion loss, and polarization sensitivity, and supports online parameter dynamic matching.

[0152] Anti-interference design, using a multi-level equalization algorithm to suppress the fiber nonlinear effect and dispersion, ensuring the wavelength stability under long-distance transmission.

[0153] Modular Packaging and Integration:

[0154] Compact packaging, integrating electrical and optical interfaces through the backplane, simplifies the disassembly and assembly process (such as the planar layout design in Huawei patents), and improves the operation and maintenance efficiency.

[0155] High-reliability design, selecting high-temperature resistant and anti-aging optical materials, and verifying the long-term stability through accelerated life tests (>100,000 hours MTBF).

[0156] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

[0157] The above describes the present invention and its implementation manners. Such description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and design similar structural manners and embodiments without creative efforts without departing from the purpose of the present invention, they shall fall within the protection scope of the present invention.

Claims

1. An optical communication system for frequency deviation adjustment, characterized in that: include: Light source module: tunable laser to support multi-wavelength operation; Modulation module: modulates the data signal onto the optical signal; Optical fiber transmission module: responsible for transmitting modulated optical signals over long distances through optical fibers; Receiving module: used to convert the received optical signal into an electrical signal; Frequency deviation detection module: detects the frequency deviation of the optical signal; Digital signal processing module: estimates and compensates the frequency deviation of the received signal; Feedback control module: adjusts the light source or modulation module through feedback to further reduce frequency deviation; Monitoring and control module: Dynamically optimize frequency deviation adjustment parameters based on detection results.

2. The optical communication system for frequency offset adjustment according to claim 1, characterized in that: The light source module includes: a laser unit: generates a narrow line width and high stability optical signal; Frequency stabilization control unit: maintains the stability of the laser output frequency; Wavelength control unit: provides precise wavelength adjustment capability and supports multi-wavelength communication; Power control unit: controls the output power of optical signals to meet transmission requirements; Optical output coupling unit: leads the optical signal generated by the laser to the optical fiber; Monitoring and protection unit: monitors the status of the light source module and protects its normal operation.

3. The optical communication system for frequency offset adjustment according to claim 2, characterized in that: The modulation module includes: an electrical signal processing unit: preprocessing the input electrical signal; Modulator unit: modulates the electrical signal onto an optical carrier; Bias control unit: maintains the working point of the modulator stable; Driving circuit unit: provides high-frequency electrical signal driving for the modulator; Signal format generation unit: generates modulated electrical signal format; Optical signal synthesis unit: synthesizes multiple optical signals into a composite signal; Optical coupling and output unit: efficiently couples the modulated optical signal into the optical fiber; Monitoring and calibration unit: real-time monitoring of the performance of the modulation module.

4. The optical communication system for frequency offset adjustment according to claim 3, characterized in that: The optical fiber transmission module includes: an optical fiber unit: to realize long-distance transmission of optical signals; Optical amplifier unit: compensates for the attenuation of optical signals caused by losses during transmission; Dispersion compensation unit: compensates for the accumulated dispersion in the optical fiber; Nonlinear management unit: mitigates the impact of nonlinear effects in optical fiber transmission; Optical isolation and optical circulation unit: prevents reverse light from interfering with the system, supports single-fiber bidirectional transmission or multi-channel optical signal distribution; Wavelength division multiplexing unit: realizes multiplexing and demultiplexing of optical signals of multiple wavelengths; Polarization multiplexing unit: uses the polarization state of optical signals for multiplexing to increase channel capacity; Optical signal monitoring and feedback unit: monitors the quality and performance of optical signals in real time and provides feedback adjustment mechanism; Optical switch and protection unit: provides switching and protection of optical signals in case of system failure; Environmental control unit: ensures the stability of the optical fiber transmission module and reduces the impact of environmental factors.

5. The optical communication system for frequency offset adjustment according to claim 4, characterized in that: The frequency deviation detection module includes: Photoelectric conversion unit: converts the received optical signal into an electrical signal, providing a basis for subsequent frequency deviation detection; Coherent receiving unit: extracts phase and frequency information from the optical signal for frequency offset estimation; Digital signal processing unit: estimates and analyzes the frequency deviation of the received signal; Local oscillator frequency control unit: adjusts the frequency of the local oscillator light source to be close to the frequency of the transmitting light source; Phase-locked loop unit: achieves accurate frequency deviation tracking and compensation by locking the phase of the received signal; Automatic gain control unit: adjusts the level of the received signal; Data calibration unit: calibrates the detected frequency deviation value to improve measurement accuracy; Monitoring and output unit: outputs frequency deviation detection results and provides monitoring data.

6. The optical communication system for frequency offset adjustment according to claim 5, characterized in that: The digital signal processing module includes: Digital signal acquisition unit: samples and quantizes the received analog signal; Equalization and channel compensation unit: compensates for channel distortion introduced during signal transmission; Frequency offset and phase shift compensation unit: detects and compensates for frequency offset and phase noise caused by laser instability; Timing recovery unit: extracts accurate sampling clock from received signal; Symbol demodulation unit: demodulates the received digital signal according to the modulation format; Data decoding and error correction unit: restores the original bit stream and corrects errors in transmission; Signal quality monitoring unit: evaluates the performance and quality of received signals; Signal resynchronization and frame recovery unit: extracts frame header and synchronization information from received data stream; Digital filtering unit: performs frequency domain filtering on the received signal to remove noise and interference; Power control and normalization unit: adjusts the signal power amplitude to match the requirements of subsequent processing units; Advanced processing unit: supports extended applications.

7. The optical communication system for frequency offset adjustment according to claim 6, characterized in that: The digital signal processing unit adopts a nonlinear compensation algorithm. The specific algorithm formula is as follows: Digital back propagation; used to compensate for fiber nonlinearity; A(z, t): complex envelope of the signal; α: attenuation coefficient; β2: dispersion coefficient; γ: nonlinear coefficient.

8. The optical communication system for frequency offset adjustment according to claim 7, characterized in that: The equalization and channel compensation unit adopts a linear dispersion compensation algorithm. The specific algorithm formula is as follows: Frequency domain equalization: used to compensate for the fiber dispersion effect; Y(f) = X(f)·H(f); X(f): frequency domain representation of the received signal; Dispersion compensation filters; β2: group velocity dispersion coefficient; L: optical fiber length.

9. The optical communication system for frequency offset adjustment according to claim 8, characterized in that: The frequency offset and phase shift compensation unit adopts a frequency offset compensation algorithm. The specific algorithm formula is as follows: The frequency deviation is estimated by detecting the peak of the main frequency of the received signal; x(n): sampling sequence of received signal; N: number of FFT points; The frequency corresponding to the peak of the main frequency is the frequency deviation Δf; Using cyclic characteristics to estimate frequency deviation; r(n): received signal; T: symbol time; ∠: represents the phase angle; The frequency deviation is estimated by calculating the autocorrelation function of the signal; The frequency offset is determined by the phase difference between adjacent autocorrelation samples; 10. A method for link tracking and anomaly capture, characterized in that; The operation of the optical communication system with frequency deviation adjustment according to claim 9 mainly comprises the following steps: Step A1: Initialize the light source module, initialize the tuned laser and set it to support multi-wavelength operation, and select a specific wavelength to work according to communication requirements; Step A2: generating a modulation signal, loading the input data signal onto the optical signal through a modulator; Step A3: Optical signal transmission: the modulated optical signal is transmitted over a long distance through an optical fiber transmission module; Step A4: receiving the optical signal. In the receiving module, the optical signal is converted into an electrical signal by a photodetector and is preliminarily amplified and filtered. Step A5: frequency deviation detection, in the frequency deviation detection module, the spectrum characteristics of the received electrical signal are analyzed to detect the frequency deviation; Step A6: digital signal processing: according to the detected frequency deviation, the digital signal processing module estimates and compensates the frequency deviation of the signal; Step A7: Feedback adjustment, the feedback control module adjusts the parameters of the light source module or the modulation module according to the frequency deviation detection result; Step A8: Monitoring and dynamic optimization: real-time monitoring of the operating status of the entire system and recording the frequency deviation change trend; Step A9: output the compensation signal, the compensated electrical signal is output and converted into a digital signal for transmission; Step A10: System calibration and maintenance: calibrate the system regularly to ensure parameter consistency of the light source module, modulation module, and feedback module.

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