A method and system for dispersion compensation of optical modules based on hot-state feedback

Abstract

The application discloses a kind of light module dispersion compensation method and system based on hot state feedback, it is related to optical communication technical field.To solve the problem of high power consumption of light module pure electric field dynamic dispersion compensation computing power, and the dynamic residual error of static solidification compensation, the method comprises: obtaining link configuration parameters;Accordingly generate reference wavelength, and set the reference hot state of light emission source;According to the preset fixed compensation amount, the input signal of receiving end is carried out static digital compensation, and the residual dispersion error after compensation is extracted;According to the error, generate hot state bias, and superimposed to reference hot state to update the operating hot state of light emission source.The application greatly reduces the power consumption of computing power by solidifying digital compensation coefficient, and constructs the cross-domain closed loop of receiving end digital domain and transmitting end physical hot domain, utilizes temperature fine-tuning wavelength to offset dynamic dispersion, effectively considers dynamic dispersion compensation performance and extremely low power consumption demand under limited hardware.

Description

Technical Field

[0001] This invention relates to the field of optical communication technology, and specifically to a method and system for optical module dispersion compensation based on thermal feedback. Background Technology

[0002] With the rapid development of 5G communication, cloud computing, and large data centers, the demand for network bandwidth is growing exponentially. Single-mode optical modules have been widely used in scenarios such as metropolitan area networks and data center interconnection. In single-mode fiber transmission systems, when the transmission distance is long (e.g., 10 to 80 kilometers), the dispersion effect of the fiber becomes the primary physical factor limiting transmission quality. Dispersion causes the light pulse to broaden in the time domain, leading to severe inter-symbol interference, which in turn causes a sharp increase in the bit error rate at the receiver.

[0003] Early solutions to dispersion problems often employed passive optical devices such as dispersion-compensating fiber (DCF) or fiber Bragg gratings. However, these devices are bulky and have high insertion loss, making them impossible to integrate into today's miniaturized pluggable optical modules (such as QSFP+ packages) with extremely stringent size requirements.

[0004] To address the aforementioned issues, existing technologies have gradually shifted towards compensation in the electrical domain and have attempted to integrate dispersion compensation chips into the optical module. For example, Chinese patent CN103281129A discloses an "Optical Module and its Electrical Domain Dispersion Compensation Method." This scheme proposes setting up an EDC (Electronic Dispersion Compensation) chip and a microcontroller unit (MCU) inside the optical module. The EDC chip determines the delay and distortion of the electrical signal and sends it to the MCU, which calculates the dispersion compensation value and feeds it back to the EDC chip, thus achieving dispersion compensation purely in the electrical domain within the optical module. However, when facing dynamic dispersion drift caused by fiber aging, temperature fluctuations, or stress changes in actual links, existing technologies have fallen into an irreconcilable technical dilemma:

[0005] On the one hand, if a dynamic adaptive compensation mechanism is adopted, the DSP must continuously and frequently run adaptive algorithms (such as blind equalization algorithms) to refresh the tap coefficients of the filter in real time. This tracking mechanism, which relies on "high computing power for dynamic compensation," will cause the chip power consumption and heat generation to soar. Due to the extreme compression of the physical size of the optical module by the Multi-Source Algorithm (MSA) and the strict limitation of the host on the maximum power consumption budget of the port, high-frequency electrical domain dynamic operation can easily cause the optical module to "thermally fail" when there is no space inside the module to add effective heat dissipation components.

[0006] On the other hand, if we revert to a static fixed compensation mechanism (i.e., fixed DSP filter coefficients) in order to reduce power consumption, this scheme can only compensate for the reference dispersion at a fixed distance. Once the link generates dynamic time-varying dispersion fluctuations, static compensation will produce residual dispersion errors that cannot be covered, directly causing the bit error rate at the receiver to exceed the threshold and making it impossible to maintain communication quality.

[0007] Furthermore, existing technologies have significant limitations in their system control architecture. Their dispersion tolerance management relies excessively on passive compensation through electrical domain signal processing at the receiver (Rx), failing to fully exploit the collaborative correction potential of the underlying physical characteristics of the transmitter (Tx). Specifically, existing long-distance optical modules typically integrate a semiconductor thermoelectric cooler (TEC), but the controlled dimension of this component is limited to maintaining the static isothermal operation of the optical emission source to avoid center wavelength drift; an effective cross-domain closed-loop control architecture has not been established within the system. Summary of the Invention

[0008] The technical problem to be solved by this application is: how to solve the problem that the existing pure electric domain adaptive algorithm, when performing dynamic dispersion compensation, must rely on real-time high-frequency iterative calculations, which leads to soaring power consumption and excessive thermal load in optical modules with extremely limited physical space.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: a method for optical module dispersion compensation based on thermal feedback, comprising the following steps:

[0010] Obtain link configuration parameters, including target transmission distance, fiber dispersion coefficient, and fiber dispersion slope;

[0011] Based on the link configuration parameters, a preset wavelength offset is calculated. The standard center wavelength is added to the preset wavelength offset to obtain the reference wavelength. The reference thermal state of the optical emission source is set based on the reference wavelength. The preset wavelength offset is used to generate additional dispersion in the optical fiber dispersion slope to offset the expected dynamic dispersion fluctuation.

[0012] At the receiving end, a preset fixed compensation amount is used to perform static compensation on the electrical signal, and the residual dispersion error is extracted.

[0013] A thermal bias is generated based on the residual dispersion error and superimposed on the reference thermal state to update the operating thermal state. The residual error is dynamically suppressed by adjusting the wavelength at different temperatures.

[0014] This application also provides a thermal feedback-based optical module dispersion compensation system, the system including a processor and a memory storing instructions that, when executed by the processor, implement the steps of the method described in any of the preceding claims.

[0015] Compared with the prior art, the beneficial technical effects of this application are as follows:

[0016] This invention fully leverages the control potential of the integrated TEC components in optical modules, transferring some dynamic dispersion correction to the transmitting optical domain: only low-computing-power static fixed compensation and residual error detection are retained at the receiving end. Dynamic residual dispersion cancellation is achieved by adjusting the wavelength of the transmitting source through thermal feedback. This eliminates the need for the DSP to continuously run high-frequency adaptive iterative algorithms, greatly reducing the computational power requirements of the electrical domain and chip power consumption, thus fundamentally avoiding the thermal load exceeding limits problem caused by pure electrical domain dynamic compensation. At the same time, it retains the ability to track and correct dynamic dispersion drift. Without changing the existing packaging structure of the optical module or increasing hardware costs, it balances low power consumption requirements and dynamic dispersion compensation performance, solving the problem of unstable communication quality in static compensation schemes. Attached Figure Description

[0017] Figure 1 This is the system topology diagram of the present invention.

[0018] Figure 2 This is a flowchart of the method of the present invention.

[0019] Figure 3 This is a system block diagram of the present invention. Detailed Implementation

[0020] In this application, the term "light emission source" refers to an active device within an optical module that generates and modulates signal light, typically a semiconductor light emission source, which is generally encapsulated within a light emission assembly (TOSA). Unless otherwise specified, all subsequent references to temperature-controlled objects and wavelength-generating components will be referred to as "light emission source".

[0021] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] To facilitate understanding of the methods and systems provided in the embodiments of this application, the background of the embodiments of this application will be introduced before introducing the embodiments of this application.

[0023] As mentioned in the background section, existing long-distance single-mode optical modules face a dilemma when dealing with dynamic dispersion: if purely electrical adaptive dynamic compensation is used, the high-frequency blind equalization iteration operation will cause the power consumption of the digital processing chip to soar, and the extremely compact package size (such as QSFP+) will prevent the addition of mechanical heat dissipation components, which can easily lead to system thermal collapse; if static compensation with fixed coefficients is used to reduce power consumption, the residual dispersion error caused by dynamic changes in the link cannot be eliminated, resulting in excessive communication bit error rate.

[0024] Based on a profound understanding of the aforementioned hardware barriers and the underlying physical characteristics of optical communication, the inventors of this application propose a novel control architecture of "electrical domain dimensionality reduction and staticization, and physical thermal domain cross-domain collaboration." The core breakthrough of this application lies in: completely abandoning the dynamic coefficient refresh mechanism of DSPs, and instead utilizing a fixed digital filter with extremely low computing power to handle reference dispersion (solving power consumption and heat generation issues); simultaneously, breaking the industry's technical prejudice that TECs (thermoelectric transducers) are merely static thermostats, innovatively transforming the residual dispersion error extracted from the receiver's (Rx) electrical domain into a thermal bias at the transmitter's (Tx) end. By actively fine-tuning the TEC's operating temperature, a slight shift in the center wavelength of the light source is achieved, directly offsetting dynamic dispersion distortion (solving the residual error problem) using the underlying propagation characteristics of physical optics.

[0025] It should be noted beforehand that, in order to highlight the core cross-domain control logic of this invention, the conventional hardware transceiver link has been simplified and presented as a black box in the accompanying drawings and this embodiment. Those skilled in the art will understand that the optical signal input at the receiving end must undergo photoelectric conversion and analog-to-digital sampling via an optical receiver assembly (ROSA); while the optical emission source at the transmitting end is typically encapsulated within an optical transmitter assembly (TOSA), which, in conjunction with a laser driver and micro-optical lenses, completes modulation and fiber coupling. The aforementioned conventional photoelectric physical conversion process is not the core innovation of this invention, and therefore will not be elaborated upon here.

[0026] Based on the above-mentioned core inventive concept, the specific implementation steps of this application will be described in detail below with reference to the accompanying drawings.

[0027] Example 1: A Reference Method for Dispersion Compensation of Optical Modules Based on Thermal Feedback Figure 1 and Figure 2 This embodiment provides a dispersion compensation method for optical modules based on thermal feedback. This method is preferably run in the microcontroller unit (MCU) inside the optical module, and specifically includes the following steps:

[0028] S101: Obtain link configuration parameters, including target transmission distance, fiber dispersion coefficient, and fiber dispersion slope.

[0029] Specifically, it includes:

[0030] S101a: Complete device handshake and initialization. After the optical module is inserted into the host device and powered on, it establishes a communication handshake with the host through the I2C bus to complete the device identification and initialization process.

[0031] S101b: Read link configuration parameters. Obtain the following parameters of the current link via the internal bus or configuration commands issued by the host:

[0032] The target transmission distance L is, for example, 40km or 80km;

[0033] The fiber dispersion coefficient D is the dispersion coefficient of the single-mode fiber used in the current wavelength window, with a typical value of about 17 ps / (nm·km).

[0034] The fiber dispersion slope S, i.e. the rate of change of the dispersion coefficient with wavelength, is measured in ps / (nm²·km). It is obtained by querying the fiber dispersion curve pre-stored in the local register or by the host device during link initialization.

[0035] Step S102: Calculate the preset wavelength offset according to the link configuration parameters, add the preset wavelength offset to the standard center wavelength to obtain the reference wavelength, and set the reference thermal state of the light emission source based on the reference wavelength.

[0036] Specifically, it includes:

[0037] S102a: Calculate the preset wavelength offset. Calculate the preset wavelength offset using the following formula. :

[0038]

[0039] in, The unit is the amount of dispersion fluctuation that is expected to be compensated for by wavelength shift. ;

[0040] S is the dispersion slope of the optical fiber, in units of... ;

[0041] S102b: Calculate the reference wavelength.

[0042] Standard center wavelength offset from preset wavelength Add them together to obtain the reference wavelength:

[0043]

[0044] S102c: Calculation reference hot state.

[0045] Calculate the thermal offset using the following formula. :

[0046]

[0047] in, ν is the wavelength-temperature tuning coefficient of the light emission source, in nm / ℃.

[0048] Preset standard operating hot state With thermal offset Adding them together, we obtain the reference hot state:

[0049]

[0050] S102d: Output reference hot state.

[0051] Control the semiconductor thermoelectric cooler below the light emission source to bring the light emission source to a reference thermal state. This ensures that the center wavelength of the signal light output by the light source is the reference wavelength. .

[0052] The dynamic compensation of this invention does not involve directly re-equalizing the broadened pulse at the receiving end, but rather utilizes the dispersion coefficient of a single-mode fiber. The characteristic that varies with wavelength (i.e., the existence of a non-zero dispersion slope) Typical values ​​are approximately 0.056-0.058. Let the reference wavelength be... The corresponding fiber dispersion coefficient is Then, at the target transmission distance L, the reference dispersion is The FIR filter fixed at the receiver is designed to compensate for this fixed amount. When environmental factors such as temperature and stress cause fiber dispersion... When the fluctuation occurs, the actual link dispersion becomes + At this point, the fixed compensation cannot completely offset the dispersion, resulting in residual dispersion. .

[0053] This invention utilizes TEC to fine-tune the thermal state of the light emission source. This causes a shift in the center wavelength. The change in the dispersion coefficient at the corresponding operating point This introduces an additional dispersion on the fiber side. .

[0054] Adjusting this additional amount to be equal in magnitude and opposite in sign to the residual dispersion pulls the equivalent residual dispersion at the receiver back to zero, thus rematching the total dispersion of the link with the fixed compensation amount and restoring communication quality. This process only changes the dispersion operating point experienced by the overall signal spectrum and does not rely on secondary correction of the relative delays of each frequency component within the pulse; therefore, only a few units of compensation are typically required. The dynamic drift requires a very small wavelength shift, which is completely within the controllable range of the optical emission source TEC.

[0055] Step S103: Perform static digital compensation on the input signal at the receiving end according to the preset fixed compensation amount, and extract the residual dispersion error after compensation. This is the core step of the present invention to reduce power consumption. To avoid the high power consumption caused by enabling the blind equalization algorithm on the DSP, the present invention configures the DSP to "fixed mode". Specifically, the MCU reads the fixed tap coefficients stored in the local register (these coefficients correspond to the median compensation value of the dispersion tolerance range) and directly loads the fixed tap coefficients into the finite impulse response (FIR) filter of the DSP signal processing link. The fixed tap coefficients are pre-calibrated in the following way: based on the reference total dispersion at the target transmission distance. To achieve the target compensation value, a set of FIR filter tap weights is calculated in the offline state based on the minimum mean square error criterion or the zero-forcing algorithm. This ensures that the group delay characteristics of the filter can accurately cancel the phase distortion caused by the reference dispersion within the signal bandwidth. The calculated tap coefficients are fixed into a constant table, burned into or stored in the local register, and loaded once upon chip power-up, without being refreshed during operation. At this time, the DSP performs constant dispersion cancellation on the received signal with extremely low computational power. However, fixed compensation cannot cope with dynamic dispersion fluctuations caused by sudden changes in fiber optic ambient temperature or minor routing changes. Therefore, the detection module in the DSP continuously collects the bit error rate (BER) of the forward error correction code (FEC) at a preset period. When the BER is determined to be higher than a preset secure communication threshold (e.g., 1E-4), it indicates that residual dispersion has occurred. At this time, the underlying error accumulator is triggered to accurately record the clock phase offset of the current digital signal and report it to the MCU as "residual dispersion error".

[0056] In this application, the physical mapping relationship between "clock phase offset" and "residual dispersion error" is based on the following principle: After applying fixed dispersion compensation, if residual dispersion still exists in the link, this residual dispersion will cause pulse broadening of the received signal. This broadening manifests as a lateral contraction of the digital signal eye diagram in the clock data recovery circuit, thereby causing the optimal sampling point to deviate from the center of the eye diagram, i.e., generating clock phase offset. In a system with a fixed symbol rate, there is a deterministic relationship between this clock phase offset (unit: picosecond) and the residual dispersion value (unit: ps / nm) that causes it, determined by the fiber optic link. After pre-calibration, the error accumulator inside the DSP can directly convert the detected phase offset proportionally into a residual dispersion error value for closed-loop control.

[0057] Step S104: Generate a thermal bias based on the residual dispersion error, and superimpose the thermal bias onto the reference thermal state to update the operating thermal state of the light source. This is the core step of the present invention to achieve cross-domain dynamic compensation. After receiving the residual dispersion error from the electrical domain, the MCU inputs it into a preset PID (proportional-integral-derivative) controller. The control parameters of this PID controller (proportional coefficient) Integral Time Differential time Based on the thermal response time constant of the TEC and the wavelength-temperature tuning coefficient of the light emission source. Tuning is performed. The tuning principle is to ensure that the closed-loop adjustment bandwidth mapped from the residual dispersion error to the temperature control quantity is much smaller than the residual error extraction period of the DSP and greater than the gradual change rate of the environment, thereby avoiding oscillations between the control loop and the detection loop and ensuring dynamic tracking capability for gradual drift. In this embodiment, the PID parameters are tuned to a set of fixed empirical values ​​and stored in the MCU firmware. The PID controller outputs an extremely small thermal adjustment step value (e.g., 0.1℃) at a preset period as the thermal bias. Before performing temperature adjustment, to prevent the light emission source from being damaged due to excessively high or low temperatures or causing the wavelength to completely deviate, this invention introduces a hardware safety fallback mechanism: the MCU sums the calculated thermal bias with the current thermal value fed back by the current NTC thermistor to obtain a new target thermal value; then it determines whether the target thermal value is within the preset safe thermal range (e.g., 20℃ to 30℃). If the temperature is within the safe range, a command is directly issued to the TEC to perform a thermal update; if the temperature exceeds the safe range, the command is forcibly clamped to the boundary value (e.g., the maximum temperature allowed is only 30°C) to ensure the absolute safety of the physical devices.

[0058] Furthermore, to avoid "oscillations" in the control system and further save power consumption, this system also has a convergence closed-loop mechanism: after updating the hot state, the MCU cyclically extracts the latest round of residual dispersion error. When the absolute value of the extracted residual dispersion error is less than the preset convergence threshold within N consecutive detection cycles (N is an integer greater than or equal to 1) (meaning that the bit error rate has recovered to a healthy level), the MCU maintains the current TEC operating hot state and temporarily suspends the iterative update of the hot state bias until the next sudden change in bit error rate, at which point the process is restarted.

[0059] Through the above steps, the present invention ingeniously constructs a single-module autonomous closed loop of "digital electrical domain error checking at the receiving end -> physical thermal domain temperature adjustment and compensation at the transmitting end", which effectively offsets dynamic time-varying dispersion in long-distance transmission under the premise of shutting down the high-power adaptive algorithm of DSP.

[0060] Assuming a G.652 single-mode fiber is used and the transmission distance is 80km, the dispersion coefficient in the 1550nm window is... ≈17 Dispersion slope 0.058 .

[0061] The FIR filter embedded at the receiver is configured for precise compensation. The reference dispersion. If the fiber dispersion coefficient increases due to an increase in ambient temperature. Then the link will have additional residual dispersion. .

[0062] To counteract this residual wavelength, the center wavelength of the light source needs to be adjusted towards shorter wavelengths via TEC. .

[0063] Assuming the light emission source Then the required thermal bias —Clearly, this value has exceeded the safe range and has been clamped, indicating that this method is suitable for compensating for smaller dynamic drifts (e.g., This aligns with the range of slow time-varying dispersion fluctuations that need to be handled in practical applications. When large drifts occur, the system will maintain the clamping boundaries and work in coordination with the tolerance of forward error correction codes (FEC), ensuring that the overall communication robustness remains unaffected.

[0064] For typical dynamic fluctuations ( (corresponding to a residual of 2.4 ps / nm at 80km), required It is completely within the safe operating range and can converge accurately.

[0065] Example 2: A dispersion compensation system for optical modules based on thermal feedback

[0066] Based on the same inventive concept as Embodiment 1, such as Figure 3As shown, this embodiment provides an optical module dispersion compensation system based on thermal feedback. This system operates within the aforementioned optical module. Specifically, the system includes: a memory, a processor (such as an MCU module), and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it is logically divided into the following virtual functional modules: Parameter acquisition module: used to acquire link configuration parameters including the target transmission distance, fiber dispersion coefficient, and fiber dispersion slope. Reference control module: used to calculate the reference wavelength based on the underlying physical equations (distance-to-wavelength conversion, wavelength-to-temperature conversion), and control the TEC to enter the initial reference thermal state. Digital compensation module: This module is deeply integrated into the DSP. Its core is to abandon the dynamic update mechanism, only loading preset fixed filter coefficients to perform static cancellation on the received electrical signal, and outputting the clock phase offset as the residual dispersion error when the bit error rate exceeds the limit. Thermal feedback module: responsible for performing cross-domain decision-making. Based on the extracted error, a tiny target temperature bias command is generated using a PID algorithm. After passing a safety threshold check, this command is superimposed on and modifies the current driving target of the TEC component. By fine-tuning the emission wavelength of the light source using physical temperature, dynamic dispersion distortion is directly resolved at the optical domain level. The various modules of this system work together to ultimately achieve the steps described in Example 1.

[0067] The embodiments and functional operations of the subject matter described in this specification can be implemented in the following ways: digital electronic circuits, tangibly implemented computer software or firmware, computer hardware, including the structures disclosed in this specification and their equivalents, or combinations thereof. Embodiments of the subject matter described in this specification can be implemented as one or more computer programs, that is, one or more modules of computer program instructions encoded on one or more tangible non-transitory program carriers, for execution by a data processing device or to control the operation of the data processing device.

[0068] Alternatively or additionally, program instructions may be encoded on artificially generated propagation signals, such as machine-generated electrical, optical, or electromagnetic signals, which are then generated as coded information to be transmitted to an appropriate receiver device executed by data processing equipment. The computer storage medium may be a machine-readable storage device, a machine-readable storage substrate, a random or serial access memory device, or one or more combinations of the above.

[0069] The processing and logic flows described in this specification can be executed by one or more programmable computers, which execute one or more computer programs by processing input data and generating output to run functions. The processing and logic flows can also be executed by special-purpose logic circuitry, such as FPGAs (Field-Programmable Gate Arrays) or ASICs (Application-Specific Integrated Circuits), and the device can also be implemented as special-purpose logic circuitry.

[0070] To transmit interactions with a user, embodiments of the subject matter described in this specification can be implemented on a computer having: a display device, such as a CRT (cathode ray tube) or LCD (liquid crystal display) monitor, for displaying information to the user; and a keyboard and a positioning device, such as a mouse or trackball, which the user can use to send input to the computer. Other types of devices can also be used to transmit interactions with the user; for example, feedback provided to the user can be any form of sensory feedback, such as visual feedback, auditory feedback, or tactile feedback; and input from the user can be received in any form, including sound input, voice input, or tactile input. Additionally, the computer can interact with the user by sending documents to and receiving documents from a device used by the user; for example, by sending a webpage to a web browser on the user's client device in response to a received request from a web browser.

[0071] While this specification contains numerous specific implementation details, these should not be construed as limiting the scope of any invention or the scope of the claims, but rather as descriptions of features that can embody specific embodiments of a particular invention. Specific features described in this specification within the context of an independent embodiment may also be implemented in combination with a single embodiment. Conversely, various features described within the context of a single embodiment may also be implemented independently in multiple embodiments, or in any suitable sub-combination. Furthermore, while features may be described for combination and even initially claimed in this way, one or more features from a claimed combination may be removed from that combination in some cases, and the claimed combination may be redirected to a sub-combination or a variation thereof.

[0072] Similarly, although operations are described in the accompanying drawings in a specific order, it should not be construed as requiring that such operations be performed in the specific order shown or in sequential order, or that all illustrated operations be performed, in order to achieve the desired result. In certain cases, multitasking and parallel processing may be advantageous. Furthermore, the separation of various system modules and components in the above embodiments should not be construed as requiring such separation in all embodiments, and it should be understood that program components and systems can generally be integrated into a single software product or packaged into multiple software products.

[0073] Specific implementations of the subject matter have been described. Other implementations are within the scope of the following claims. For example, the activities described in the claims can be performed in a different order and still achieve the desired result. As an example, the processes described in the drawings do not necessarily require a specific order or sequence to be shown in order to achieve the desired result. In certain implementations, multitasking and parallel processing may be advantageous.

Claims

1. A method for optical module dispersion compensation based on thermal feedback, characterized in that, Includes the following steps: Obtain link configuration parameters, including target transmission distance, fiber dispersion coefficient, and fiber dispersion slope; Based on the link configuration parameters, a preset wavelength offset is calculated. The standard center wavelength is added to the preset wavelength offset to obtain the reference wavelength. The reference thermal state of the optical emission source is set based on the reference wavelength. The preset wavelength offset is used to generate additional dispersion in the optical fiber dispersion slope to offset the expected dynamic dispersion fluctuation. At the receiving end, a preset fixed compensation amount is used to perform static compensation on the electrical signal, and the residual dispersion error is extracted. A thermal bias is generated based on the residual dispersion error and superimposed on the reference thermal state to update the operating thermal state. The residual error is dynamically suppressed by adjusting the wavelength at different temperatures.

2. The optical module dispersion compensation method based on thermal feedback according to claim 1, characterized in that, Static compensation of the electrical signal is performed using a preset fixed compensation amount, including: Read the fixed tap coefficients stored in the local register, which correspond to the median compensation value of the dispersion tolerance range; The fixed tap coefficients are loaded into the finite impulse response filter of the signal processing link to perform constant dispersion cancellation on the input signal at the receiving end.

3. The optical module dispersion compensation method based on thermal feedback according to claim 1, characterized in that, Calculate the preset wavelength offset, including: The preset wavelength offset is calculated using the following formula. in, S represents the dispersion fluctuation that is expected to be compensated for by wavelength shift, and S is the dispersion slope of the optical fiber.

4. The optical module dispersion compensation method based on thermal feedback according to claim 3, characterized in that, Setting the reference thermal state of the light emission source based on the reference wavelength includes: according to the formula Calculate the thermal offset, where This is the thermal offset. The wavelength-temperature tuning coefficient of the light emission source is used; the preset standard operating thermal state is added to the thermal state offset to obtain and output the reference thermal state.

5. The optical module dispersion compensation method based on thermal feedback according to claim 1, characterized in that, Extracting residual dispersion error includes: collecting the bit error rate of the forward error correction code during digital signal processing at a preset period; when the bit error rate is determined to be higher than a preset threshold, triggering an error accumulator, recording the clock phase offset of the current signal, and converting the clock phase offset into the residual dispersion error according to a preset mapping relationship.

6. The optical module dispersion compensation method based on thermal feedback according to claim 1, characterized in that, The thermal bias is generated based on the residual dispersion error, including: The residual dispersion error is input into a preset proportional-integral-derivative controller; The proportional-integral-derivative controller outputs a hot-state adjustment step value at a preset period, and the hot-state adjustment step value is used as the hot-state bias.

7. The optical module dispersion compensation method based on thermal feedback according to claim 1, characterized in that, The hot-state bias is superimposed onto the reference hot state to update the operating hot state of the optical emission source, including: The target thermal value is obtained by summing the thermal bias value with the current thermal value; wherein, during the first execution, the reference thermal value is used as the current thermal value, and during subsequent executions, the operating thermal value after the previous round of updates is used as the current thermal value; Determine whether the target thermal state value is within a preset safe thermal state range; If the operating temperature is within the safe thermal state range, then update the operating temperature according to the target thermal state value; If the safe hot state range is exceeded, the operating hot state will be clamped to the boundary value within the safe hot state range that is closest to the target hot state value.

8. The optical module dispersion compensation method based on thermal feedback according to claim 1, characterized in that, After updating the operating thermal state of the light emission source, the method further includes: cyclically extracting the latest compensated residual dispersion error; when the absolute value of the residual dispersion error extracted in N consecutive detection cycles is less than a preset convergence threshold, the current operating thermal state is kept unchanged, and the update of the thermal state bias is paused, where N is an integer greater than or equal to 1.

9. The optical module dispersion compensation method based on thermal feedback according to claim 1, characterized in that, The fiber dispersion slope is obtained by querying a pre-stored fiber dispersion curve or by obtaining the link parameters issued by the host device.

10. A dispersion compensation system for an optical module based on thermal feedback, characterized in that, include: The memory, the processor, and the computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the steps of the optical module dispersion compensation method based on thermal feedback as described in any one of claims 1 to 9.

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