Serdes signal emphasis parameter setting method and device for OTN coherent optical module

Abstract

The application discloses a kind of Serdes signal of OTN coherent optical module's emphasis parameter setting method and device, it is related to signal emphasis equalization field.The steps of the method include: after setting several different sending amplitudes in module sending end and sending Serdes signal, the receiving amplitude corresponding to each sending amplitude is obtained in module receiving end, according to the size of all receiving amplitudes, the quality of Serdes signal is determined, and the emphasis parameter of the Serdes signal with optimal quality is used as the optimal emphasis parameter.The quality of signal transmission result is used to judge quality in the application, and the situation that the quality of signal is very good but cannot meet the requirements cannot occur.The emphasis parameter of the Serdes signal with optimal quality obtained in the application is used as the optimal emphasis parameter, which can be used directly thereafter, and thus the working quality and user experience are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of signal emphasis equalization, and specifically to a method and apparatus for setting emphasis parameters for the SerDes signal of an OTN coherent optical module. Background Technology

[0002] In recent years, with the rapid development and application of technologies such as cloud networks, streaming media, the Internet of Things, and 5G, data traffic has been continuously expanding, and the bandwidth requirements for networks have been increasing exponentially. OTN, as the main channel for wired transmission, has seen its single-wavelength rate evolve from large-scale commercial use of 100G and 200G to the current gradual deployment of 400G. The most important technologies in service boards are framing chips, coherent optical modules, and high-speed SerDes signals (serial communication signals) connecting these chip modules. As signal rates increase, the skin effect of high-speed signals and the dielectric loss of transmission lines cause significant signal degradation during transmission. To obtain a better waveform at the receiving terminal, it is necessary to compensate for the damaged signal. Common compensation techniques include pre-emphasis and de-emphasis.

[0003] Pre-emphasis technology enhances the high-frequency components of a signal at the beginning of a transmission line to compensate for excessive attenuation of these components during transmission. The frequency of a signal is primarily determined by the rate of change of its signal level; therefore, the high-frequency components mainly appear at the rising and falling edges of the signal. Pre-emphasis technology amplifies the amplitude at these rising and falling edges.

[0004] De-emphasis technology is similar to pre-emphasis technology; it maintains the amplitude at the rising and falling edges of the signal while weakening the signal elsewhere. The signal swing after de-emphasis compensation is smaller than that after pre-emphasis compensation, resulting in a lower eye diagram height, lower power consumption, and lower EMC (Electromagnetic Compatibility) radiation.

[0005] Pre-emphasis and de-emphasis effectively compensate for signal loss during transmission and improve signal quality. However, these techniques also have drawbacks. For example, when crosstalk exists on the line, pre-emphasis and de-emphasis can amplify high-frequency crosstalk components, increasing the severity of crosstalk. To overcome these shortcomings, equalization techniques were developed. Unlike pre-emphasis and de-emphasis, equalization is used at the signal receiver. Its characteristics are similar to a high-pass filter, significantly reducing high-frequency component loss and effectively filtering out high-frequency crosstalk.

[0006] The module's chip has self-balancing capabilities, adaptively adjusting equalization compensation based on the received signal. However, in most cases, the signal at the transmitting end may be significantly damaged during transmission, making it difficult for the receiving chip to recover through self-balancing. Therefore, manual setting of pre-emphasis and de-emphasis parameters is necessary to compensate for transmission loss. Chips capable of viewing SerDes signal eye diagrams can intuitively determine the quality of the received signal through eye height, eye width, eye amplitude, and eye crossover ratio. The DSP (Digital Signal Processing) chip inside the coherent optical module does not have eye diagram viewing capabilities. In this case, the current practice is to measure signal quality by checking the bit error rate (BER) of the SerDes signal received by the coherent optical module.

[0007] However, during the testing process, it was found that although the bit error rate of the module's SerDes signal was 0 (indicating very good signal quality), the module's OSNR (Optical Signal-to-Noise Ratio) performance did not reach the optimal index or the probability of restarting a single-board service was not high. In other words, the accuracy of measuring signal quality by checking the bit error rate of the SerDes signal at the coherent optical module's receiving end is insufficient. Summary of the Invention

[0008] In view of the deficiencies in the existing technology, the technical problem solved by the present invention is: how to accurately determine the SerDes signal quality of the coherent optical module and set the emphasis parameters accordingly.

[0009] To achieve the above objectives, the present invention provides a method for setting the emphasis parameters of the Serdes signal in an OTN coherent optical module, comprising the following steps: setting several different transmission amplitudes at the transmitting end of the module and transmitting the Serdes signal, obtaining the received amplitude corresponding to each transmission amplitude at the receiving end of the module, determining the quality of the Serdes signal based on the magnitude of all received amplitudes, and taking the emphasis parameter of the Serdes signal with the best quality as the optimal emphasis parameter.

[0010] Based on the above technical solution, the process of determining the quality of the Serdes signal according to the magnitude of all received amplitudes includes: calculating the amplitude difference S of the Serdes signal, S=|X1-X1'|+|X2-X2'|+…+|Xn-Xn'|, where X represents the transmitted amplitude, X' represents the received amplitude corresponding to the transmitted amplitude, and n represents the number of amplitude settings; the standard for the best quality Serdes signal is: the Serdes signal with the smallest amplitude difference.

[0011] Based on the above technical solution, after obtaining the received amplitude and before calculating the amplitude difference, the following steps are also included: establishing a rectangular coordinate system, where the horizontal and vertical axes represent the transmitted amplitude and the received amplitude, respectively; filling each transmitted amplitude into the rectangular coordinate system in a specified order; drawing an emphasis curve based on the coordinates of each transmitted amplitude and its corresponding received amplitude; retaining the emphasis curve that changes continuously along a specified direction, with the specified direction corresponding to the specified order.

[0012] Based on the above technical solution, the several different transmission amplitudes include a minimum value, a maximum value, and an intermediate value between the minimum and maximum values; after obtaining the received amplitude and before calculating the amplitude difference, the following steps are also included: if the received amplitude corresponding to each transmission amplitude is above a specified threshold, then the quality of the current Serdes signal is determined to be optimal, and the emphasis parameter of the current Serdes signal is taken as the optimal emphasis parameter.

[0013] Based on the above technical solution, the process of this method includes:

[0014] S1: Combine each de-emphasis parameter with each pre-emphasis parameter to form several emphasis parameters and save them to the database;

[0015] S2: Retrieve one emphasis parameter from the database, set three transmission amplitudes at the module transmitter: minimum, middle and maximum values, send the Serdes signal according to the three transmission amplitudes, retrieve the received amplitude corresponding to each transmission amplitude at the module receiver, and proceed to S3;

[0016] S3: Establish a rectangular coordinate system, where the horizontal axis represents the transmitted amplitude and the vertical axis represents the received amplitude. Fill each transmitted amplitude into the rectangular coordinate system in ascending order. Plot an accented curve based on the coordinates of each transmitted amplitude and its corresponding received amplitude. Determine whether the accented curve is in a continuously rising direction. If so, go to S4; otherwise, go to S5.

[0017] S4: Determine whether the received amplitude corresponding to each transmitted amplitude is above the specified threshold. If yes, proceed to S6; otherwise, calculate the amplitude difference of the Serdes signal and proceed to S5.

[0018] S5: After deleting the current emphasis parameter from the database, check if the emphasis parameter exists in the database. If it does, go to S2; otherwise, compare the amplitude difference of all Serdes signals, obtain the Serdes signal with the smallest amplitude difference, and go to S6.

[0019] S6: Set the quality of the current Serdes signal to be optimal, and use its corresponding emphasis parameters as the optimal emphasis parameters.

[0020] The device for setting the emphasis parameters of the SerDes signal in an OTN coherent optical module provided by the present invention includes a SerDes signal transmission module, a received amplitude acquisition module, a signal quality judgment module, and an optimal emphasis parameter determination module.

[0021] The Serdes signal transmitting module is used to: set several different transmission amplitudes at the module's transmitting end and transmit Serdes signals;

[0022] The received amplitude acquisition module is used to: acquire the received amplitude corresponding to each transmitted amplitude at the receiving end of the module;

[0023] The signal quality judgment module is used to determine the quality of the SerDes signal based on the magnitude of all received amplitudes acquired by the received amplitude acquisition module.

[0024] The optimal emphasis parameter determination module is used to: use the emphasis parameters of the highest quality Serdes signal as the optimal emphasis parameters.

[0025] Based on the above technical solution, the workflow of the signal quality judgment module includes: calculating the amplitude difference S of the Serdes signal, S=|X1-X1'|+|X2-X2'|+…+|Xn-Xn'|, where X represents the transmitted amplitude, X' represents the received amplitude corresponding to the transmitted amplitude, and n represents the number of amplitude settings.

[0026] Based on the above technical solution, the standard for the best quality Serdes signal is: the Serdes signal with the smallest amplitude difference.

[0027] Based on the above technical solution, the signal quality judgment module further includes the following workflow before calculating the amplitude difference: establishing a rectangular coordinate system, where the horizontal and vertical axes represent the transmitted amplitude and the received amplitude, respectively; filling each transmitted amplitude into the rectangular coordinate system in a specified order; drawing an emphasis curve based on the coordinates of each transmitted amplitude and its corresponding received amplitude; retaining the emphasis curve that continuously changes along a specified direction, with the specified direction corresponding to the specified order.

[0028] Based on the above technical solution, the Serdes signal transmission module is set with several different transmission amplitudes, including a minimum value, a maximum value, and an intermediate value between the minimum and maximum values; before calculating the amplitude difference, the signal quality judgment module also includes the following workflow: if the received amplitude corresponding to each transmission amplitude is above a specified threshold, then the current Serdes signal quality is determined to be optimal.

[0029] Compared with the prior art, the advantages of the present invention are as follows:

[0030] Compared to existing technologies that determine SerDes signal quality based on bit error rate, this invention determines SerDes signal quality by measuring the amplitude at the module's receiving end. In other words, while existing technologies judge quality based on the signal's intrinsic parameters, this invention judges quality based on the signal's transmission result. Therefore, this invention avoids the situation where, in existing technologies, the perceived signal quality is excellent but the signal actually fails to meet requirements. Based on this, the optimal SerDes signal emphasis parameters obtained by this invention are used directly as the optimal emphasis parameters, significantly improving operational quality and user experience. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is the optimal emphasis curve of the OTN coherent optical module in this embodiment of the invention;

[0033] Figure 2 This is a curve showing the edge-weighting of the OTN coherent optical module in an embodiment of the present invention.

[0034] Figure 3 This is an overemphasis curve of the OTN coherent optical module in an embodiment of the present invention;

[0035] Figure 4 This invention relates to a method for setting the emphasis parameters of the SerDes signal in an OTN coherent optical module. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] The flowchart shown in the attached diagram is for illustrative purposes only and does not necessarily include all content and operations / steps, nor does it necessarily have to be performed in the order described. For example, some operations / steps can be broken down, combined, or partially merged, so the actual execution order may change depending on the actual situation.

[0038] First, the research and development principles of this invention will be explained.

[0039] Limited channel bandwidth and other non-ideal responses lead to signal distortion at the receiver, significantly limiting the increase in data transmission frequency and distance. Equalization techniques are introduced to counteract these non-ideal channel effects and address high-frequency losses caused by the channel. For the chip transmitter, configurable parameters include emphasis parameters (de-emphasis and pre-emphasis parameters) and amplitude; the receiver uses automatic equalization. Equalization and emphasis are used to compensate for the effects of trace attenuation, noise, and crosstalk during transmission on the PCB (Printed Circuit Board). Appropriate compensation can restore the transmitted signal. A certain linear relationship exists between the properly compensated signal and the transmitted signal; ideally, the transmitted amplitude and received amplitude should be completely identical.

[0040] In order to determine the quality of the signal without eye diagrams, it is necessary to investigate the service connectivity under different emphasis parameters at different amplitudes. To this end, the applicant conducted the following research and development work: using different OTN chips (specifically FRAMER chips, i.e. OTN framing chips) on the same single disk, setting different amplitudes, and then analyzing the amplitude and service connectivity at the receiving end of the module.

[0041] The following example uses a single module, defining a received amplitude of 50 or higher as indicating service activation. (See also...) Figure 1 As shown, the horizontal axis represents the settable amplitude of the module's receiving end (OTN chip) (generally adjustable from 0 to 64, corresponding to an amplitude of 200mV to 1.2V); the vertical axis represents the amplitude of the module's receiving end (range 0 to 250, corresponding to an amplitude of 0 to 1.2V). The module's emphasis parameter is A. When the amplitude at the transmitting end is 12, the service is activated, and the corresponding amplitude of the signal received by the module's receiving end is 10. Furthermore, as the amplitude of the transmitting chip gradually increases, the amplitude received by the module also increases proportionally, exhibiting a continuous linear relationship. The service activation range on the horizontal axis is 12 to 64.

[0042] See Figure 2 As shown, the emphasis parameter for this module is B. When the transmitter chip's value is set to 20, the service begins to function, and the received amplitude of the module reaches exactly 10. Furthermore, as the transmitter chip's amplitude gradually increases, the received amplitude of the module also increases proportionally, showing a linear correlation. However, the service-enabled range on the horizontal axis is from 20 to 64, which is relatively... Figure 1 The range of (12~64) is relatively small.

[0043] See Figure 3As shown, the emphasis parameter of this module is C. When the transmitting chip is set to 0, the service starts to be enabled, and the amplitude received by the module reaches 150. As the amplitude of the transmitting chip gradually increases, the amplitude received by the module drops from 150 to about 10. Then, after the transmitting chip is set to 50, the amplitude starts to increase linearly with the amplitude received by the module. However, the range of the enabled service is relatively small on the horizontal axis, ranging from 0 to 20 and 0 to 64. Moreover, there is no obvious correlation between the transmitted and received signals. It can be seen that unreasonable emphasis compensation leads to signal distortion.

[0044] in conclusion: Figure 1 This is the optimal emphasis curve (i.e., relatively speaking, the emphasis parameters are best at this point, meaning the Serdes signal is best). Figure 2 The edge-emphasis curve is shown (i.e., relatively speaking, the emphasis parameters are available but not optimal, meaning the Serdes signal is poor). Figure 3 This is an overemphasis curve (meaning the emphasis parameters are unavailable at this point, which means the Serdes signal is at its worst).

[0045] Therefore, by analyzing the emphasis curves under different parameters, we can determine the quality of the module's SerDes signal under those parameters.

[0046] Based on this, the method for setting the emphasis parameters of the SerDes signal in the OTN coherent optical module in this embodiment of the invention includes the following steps: setting the emphasis parameters of the SerDes signal, and setting several (at least 3) different transmission amplitudes at the module transmitter (see...). Figure 1 As shown, in actual process, the amplitude can be used to represent the corresponding amplitude value. After sending the Serdes signal, the received amplitude corresponding to each transmitted amplitude value is obtained at the receiving end of the module. Based on the magnitude of all received amplitude values, the quality of the Serdes signal is determined, and the emphasis parameter of the Serdes signal with the best quality is taken as the optimal emphasis parameter.

[0047] Therefore, compared with the prior art that judges SerDes signal quality based on bit error rate, this invention judges SerDes signal quality based on the amplitude at the module's receiving end. That is, the prior art judges quality based on the signal's intrinsic parameters, while this invention judges quality based on the signal transmission result. Thus, this invention avoids the situation where the signal quality is judged as excellent but actually fails to meet requirements, as is the case in the prior art. Based on this, the emphasis parameters of the optimal SerDes signal obtained by this invention are used as the optimal emphasis parameters. After testing the back-to-back OSNR of the coherent optical module, the test results are also the best (i.e., corresponding to the optimal emphasis parameters), thereby significantly improving the working quality and user experience.

[0048] Preferably, the process of determining the quality of the SerDes signal based on the magnitude of all received amplitudes in this method includes: calculating the amplitude difference S of the SerDes signals, S = |X1 - X1'| + |X2 - X2'| + ... + |X n -X n '|, where X represents the transmitted amplitude, X' represents the received amplitude corresponding to the transmitted amplitude, and n represents the number of amplitude settings; further, the standard for the best quality Serdes signal according to this method is: the Serdes signal with the smallest amplitude difference. The principle is: the smaller the amplitude difference, the closer the received amplitude is to the transmitted amplitude. At this time, the combination of emphasis parameters represents the closest linear relationship between the transmitted amplitude and the received amplitude, which is the smoothest and is the optimal parameter.

[0049] Preferably, after acquiring the received amplitude and before calculating the amplitude difference, the method further includes the following steps: establishing a rectangular coordinate system, where the horizontal and vertical axes represent the transmitted amplitude and the received amplitude, respectively; filling each transmitted amplitude into the rectangular coordinate system in a specified order (e.g., from smallest to largest); drawing an accented curve based on the coordinates of each transmitted amplitude and its corresponding received amplitude; and retaining the accented curve that continuously changes along a specified direction (corresponding to the specified order; when the specified order is from smallest to largest, the specified direction is upward; when the specified order is from largest to smallest, the specified direction is downward).

[0050] By using the above method, a large number of obviously unsuitable weighting parameters can be filtered out, thereby greatly simplifying the subsequent calculation workload.

[0051] Preferably, the different transmitted amplitudes set in this method are the minimum value, the maximum value, and the intermediate value between the minimum and the maximum value. After obtaining the received amplitude and before calculating the amplitude difference, the method also includes the following steps: if the received amplitude corresponding to each transmitted amplitude is above a specified threshold (the minimum value for service conduction), the quality of the current SerDes signal is determined to be optimal, and the emphasis parameter of the current SerDes signal is taken as the optimal emphasis parameter. The principle is as follows: theoretically, the more amplitudes set, the more accurate the final emphasis curve will be. However, after a large number of actual tests, it was found that only the minimum, intermediate, and maximum values ​​are needed to obtain the emphasis parameter that meets the working requirements. On this basis, if the received amplitude corresponding to each of the above transmitted amplitudes is above the minimum value for service conduction, it means that the emphasis parameter at this time must be the optimal emphasis parameter.

[0052] See Figure 4 As shown, the method of the present invention will be described below through a specific embodiment.

[0053] S1: Combine each de-emphasis parameter with each pre-emphasis parameter to form several emphasis parameters and save them to the database; for example: define the de-emphasis parameter as x, with a range of 0~k (k represents the maximum settable range of x, i.e., the number is k), and the pre-emphasis parameter as y, with a range of 0~t (t represents the maximum settable range of y, i.e., the number is t), then the emphasis parameters corresponding to each de-emphasis parameter are: x, 0~t, and all emphasis parameters are: 0~k, 0~t.

[0054] S2: Retrieve one emphasis parameter from the database, set three transmission amplitudes at the module transmitter: minimum, middle and maximum values, send the Serdes signal according to the three transmission amplitudes, retrieve the received amplitude corresponding to each transmission amplitude at the module receiver, and proceed to S3.

[0055] S3: Establish a Cartesian coordinate system, where the horizontal axis represents the transmitted amplitude and the vertical axis represents the received amplitude. Fill each transmitted amplitude into the Cartesian coordinate system in ascending order. Plot an accented curve based on the coordinates of each transmitted amplitude and its corresponding received amplitude. Determine if the accented curve shows a continuous upward trend. If yes, proceed to S4; otherwise, proceed to S5. An accented curve showing a continuous upward trend, representing service connection (connected) and disconnection (disconnected), is represented by: Disconnect-Connected and Connected-Connected. Other accented curves represent: Connected-Disconnected-Connected, Connected-Disconnected, Disconnected-Connected, Disconnected-Disconnected, or Disconnected-Disconnected.

[0056] S4: Determine whether the received amplitude corresponding to each transmitted amplitude is above the specified threshold (the minimum value for service activation). If yes, proceed to S6; otherwise, calculate the amplitude difference of the Serdes signal and proceed to S5.

[0057] S5: After deleting the current emphasis parameter from the database, check if the emphasis parameter exists in the database. If it does, go to S2; otherwise, it means that all emphasis parameters have been traversed. After comparing the amplitude difference of all Serdes signals, obtain the Serdes signal with the smallest amplitude difference and go to S6.

[0058] S6: Set the quality of the current Serdes signal to optimal, take its corresponding emphasis parameter as the optimal emphasis parameter, and end.

[0059] The emphasis parameter setting device for the SerDes signal of the OTN coherent optical module in this embodiment of the invention includes a SerDes signal transmission module, a received amplitude acquisition module, a signal quality judgment module, and an optimal emphasis parameter determination module.

[0060] The Serdes signal transmitting module is used to: set several different transmission amplitudes (minimum, maximum, and the middle between the minimum and maximum values) at the module's transmitting end and transmit the Serdes signal;

[0061] The received amplitude acquisition module is used to: acquire the received amplitude corresponding to each transmitted amplitude at the receiving end of the module;

[0062] The signal quality judgment module is used to determine the quality of the SerDes signal based on the magnitude of all received amplitudes acquired by the received amplitude acquisition module. The specific process includes: establishing a Cartesian coordinate system, where the horizontal and vertical axes represent the transmitted and received amplitudes respectively; filling each transmitted amplitude into the Cartesian coordinate system in a specified order; plotting an emphasis curve based on the coordinates of each transmitted amplitude and its corresponding received amplitude; retaining the emphasis curve that continuously changes along a specified direction, with the specified direction corresponding to a specified order. If the received amplitude corresponding to each transmitted amplitude is above a specified threshold, the current SerDes signal is determined to have the best quality; otherwise, the amplitude difference S of the SerDes signal is calculated: S = |X1 - X1'| + |X2 - X2'| + ... + |X n -X n '|, where X represents the transmitted amplitude, X' represents the received amplitude corresponding to the transmitted amplitude, and n represents the number of amplitude settings.

[0063] The optimal emphasis parameter determination module is used to: select the emphasis parameters of the best quality Serdes signal (the Serdes signal with the smallest amplitude difference) as the optimal emphasis parameters.

[0064] Those skilled in the art will understand that all or some of the steps, systems, and apparatuses disclosed above, and their functional modules / units, can be implemented as software, firmware, hardware, or suitable combinations thereof. In hardware implementations, the division between functional modules / units mentioned above does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed collaboratively by several physical components. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit (ASIC). Such software can be distributed on a computer-readable storage medium, which may include computer-readable storage media (or non-transitory media) and communication media (or transient media).

[0065] The above are merely specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the scope of the claims.

Claims

1. A method for setting a weighting parameter of a Serdes signal of an OTN coherent optical module, characterized in that, The method comprises the following steps: setting a plurality of different sending amplitudes at a sending end of a module and sending a Serdes signal, obtaining a receiving amplitude corresponding to each sending amplitude at a receiving end of the module, determining the quality of the Serdes signal according to the sizes of all the receiving amplitudes, and taking the weighting parameter of the Serdes signal with the optimal quality as the optimal weighting parameter; The process of determining the quality of the SerDes signal based on the magnitude of all received amplitudes includes: calculating the amplitude difference S of the SerDes signal, S = |X1 - X1'| + |X2 - X2'| + … + |X n -X n '|, where X represents the transmitted amplitude, X' represents the received amplitude corresponding to the transmitted amplitude, and n represents the number of amplitude settings; the standard for the best quality Serdes signal is: the Serdes signal with the smallest amplitude difference.

2. The method of claim 1, wherein the method is performed by the OTN coherent optical module. After obtaining the receiving amplitude, before calculating the amplitude difference, the method further comprises the following steps: The method comprises the following steps: establishing a rectangular coordinate system, wherein the horizontal direction and the vertical direction respectively represent the sending amplitude and the receiving amplitude, filling each sending amplitude into the rectangular coordinate system in a specified order, drawing a weighting curve according to the coordinates of each sending amplitude and the coordinates of the receiving amplitude corresponding to each sending amplitude, and retaining the weighting curve that continuously changes in a specified direction, wherein the specified direction corresponds to the specified order.

3. The method for setting the emphasis parameters of the SerDes signal in an OTN coherent optical module as described in claim 2, characterized in that: The plurality of different sending amplitudes comprise a minimum value, a maximum value, and an intermediate value between the minimum value and the maximum value; after obtaining the receiving amplitude, before calculating the amplitude difference, the method further comprises the following steps: if the receiving amplitude corresponding to each sending amplitude is all above a specified threshold value, it is determined that the quality of the current Serdes signal is optimal, and the weighting parameter of the current Serdes signal is taken as the optimal weighting parameter.

4. The method of setting the emphasis parameter of the Serdes signal of the OTN coherent optical module according to any one of claims 1 to 3, characterized in that, The flow of the method comprises: S1: combining each de-weighting parameter with each pre-weighting parameter to form a plurality of weighting parameters and saving the weighting parameters to a database; S2: obtaining one weighting parameter in the database, setting three sending amplitudes, i.e., a minimum value, an intermediate value and a maximum value, at the sending end of the module, obtaining the receiving amplitude corresponding to each sending amplitude at the receiving end of the module after sending the Serdes signal according to the three sending amplitudes, and proceeding to S3; S3: establishing a rectangular coordinate system, wherein the horizontal direction represents the sending amplitude and the vertical direction represents the receiving amplitude, filling each sending amplitude into the rectangular coordinate system in the order from small to large, drawing a weighting curve according to the coordinates of each sending amplitude and the coordinates of the receiving amplitude corresponding to each sending amplitude, and determining whether the weighting curve is in a continuously rising direction, if yes, proceeding to S4, and if not, proceeding to S5; S4: determining whether the receiving amplitude corresponding to each sending amplitude is all above a specified threshold value, if yes, proceeding to S6, and if not, calculating the amplitude difference of the Serdes signal and proceeding to S5; S5: deleting the current weighting parameter from the database, determining whether there is a weighting parameter in the database, if yes, proceeding to S2, and if not, comparing the amplitude differences of all the Serdes signals, obtaining the Serdes signal with the smallest amplitude difference, and proceeding to S6; S6: determining that the quality of the current Serdes signal is optimal, and taking the weighting parameter corresponding to the current Serdes signal as the optimal weighting parameter.

5. A device for setting an emphasis parameter of a Serdes signal of an OTN coherent optical module, characterized in that: The device comprises a Serdes signal sending module, a receiving amplitude obtaining module, a signal quality determining module and an optimal weighting parameter determining module; The Serdes signal sending module is configured to set a plurality of different sending amplitudes at a sending end of a module and send a Serdes signal; The receiving amplitude obtaining module is configured to obtain a receiving amplitude corresponding to each sending amplitude at a receiving end of the module; The signal quality determining module is configured to determine the quality of the Serdes signal according to the sizes of all the receiving amplitudes obtained by the receiving amplitude obtaining module; The workflow of the signal quality judging module includes: calculating the amplitude difference S of the Serdes signal, S=|X1-X1'|+|X2-X2'|+…+|Xn-Xn'|, wherein X represents a sending amplitude, X' represents a receiving amplitude corresponding to the sending amplitude, and n represents the number of amplitudes. n -X n ' represents a receiving amplitude corresponding to the sending amplitude, and n represents the number of amplitudes. The optimal weighting parameter determination module is configured to determine the weighting parameter of the Serdes signal with the optimal quality as the optimal weighting parameter.

6. The apparatus for setting the emphasis parameter of the Serdes signal of the OTN coherent optical module according to claim 5, wherein: The Serdes signal with the optimal quality is the Serdes signal with the minimum amplitude difference.

7. The apparatus for setting the emphasis parameter of the Serdes signal of the OTN coherent optical module according to claim 5, wherein: The signal quality determination module further comprises the following workflow before calculating the amplitude difference: establishing a rectangular coordinate system, in which the horizontal direction and the vertical direction represent the sending amplitude and the receiving amplitude respectively, filling each sending amplitude into the rectangular coordinate system according to a specified order, drawing a weighting curve according to the coordinates of each sending amplitude and the coordinates of the corresponding receiving amplitude, and retaining the weighting curve that continuously changes along a specified direction corresponding to the specified order.

8. The apparatus for setting the emphasis parameter of the Serdes signal of the OTN coherent optical module according to claim 5, wherein: The different sending amplitudes set by the Serdes signal sending module include the minimum value, the maximum value, and the intermediate value between the minimum value and the maximum value; and the signal quality determination module further comprises the following workflow before calculating the amplitude difference: if the receiving amplitude corresponding to each sending amplitude is above a specified threshold, it is determined that the quality of the current Serdes signal is optimal.

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