Optical path signal integrity control method and system

Abstract

The invention provides an optical path signal integrity control method and system, and relates to the technical field of optical communication. The method comprises the following steps: configuring corresponding SI-S series parameters according to a default AppSel mode agreed with a switch after each LPO optical module is electrified; the switch adjusts a corresponding FIR parameter according to the insertion loss condition of each channel and sends an AppSel mode switching instruction to an LPO optical module corresponding to each channel port, and the AppSel mode switching instruction is an instruction which is issued to the LPO optical module by the switch according to the FIR parameter adjustment condition and is used for changing the AppSel mode of the LPO optical module; any LPO optical module responds to the received AppSel mode switching instruction, instruction validity verification is carried out, if verification passes, the corresponding SI-S series parameters are updated according to the AppSel mode switching instruction, and if verification fails, parameter updating is refused to be executed. According to the scheme, the matching efficiency between the LPO optical module and the switch can be improved.

Description

Technical Field

[0001] This application relates to the field of optical communication technology, and more specifically, to a method and system for controlling the integrity of optical path signals. Background Technology

[0002] As data centers evolve towards 800G and higher speeds, the traditional solution of embedding DSP chips in optical modules has become a bottleneck due to high power consumption and high cost.

[0003] Against this backdrop, LPO optical modules have emerged. They adopt a linear drive strategy, using transimpedance amplifiers (TIAs) and drivers with excellent linearity and equalization capabilities to replace digital signal processors (DSPs) or clock data recovery units (CDRs). This avoids the disadvantages of high power consumption and high link latency of DSP or CDR optical modules, and is better suited to the data communication needs of modern data centers with short distances, high bandwidth, low power consumption, and low latency.

[0004] However, removing the DSP and CDR also brings new technical challenges: without the intervention of DSP and CDR, linear drives inevitably suffer from increased bit error rate and excessive module channel insertion loss, making their performance highly dependent on the coordinated optimization of preset parameters and the switch side. Therefore, the industry urgently needs a solution that can efficiently and accurately match the parameters of LPO optical modules and switches to solve their signal integrity problems while maintaining the low power consumption and low cost advantages of LPO modules. Summary of the Invention

[0005] The purpose of this application is to provide an optical path signal integrity control method and system that can solve the signal integrity problem while maintaining the technical advantages of low power consumption and low cost of LPO modules.

[0006] This application is implemented as follows: Firstly, this application provides an optical path signal integrity control method applied to LPO optical modules, comprising the following steps: After each LPO optical module is powered on, it configures the corresponding SI-S series parameters according to the default AppSel mode agreed upon with the switch. Upon receiving an AppSel mode switching command, any LPO optical module performs a command validity check. If the check passes, it updates the corresponding SI-S series parameters according to the AppSel mode switching command; otherwise, it refuses to perform the parameter update. The AppSel mode switching command is a command issued by the switch to the LPO optical module to change its AppSel mode after adjusting the corresponding FIR parameters according to the insertion loss of each channel.

[0007] In some implementations, the LPO optical module pre-stores multiple AppSel modes, each of which is associated with a set of predefined SI-S series parameters.

[0008] In some implementations, the predefined SI-S series parameters are preset values ​​obtained after preprocessing test samples under different switch port insertion losses and / or different temperature conditions.

[0009] In some implementations, the valid verification of the instruction includes: verifying whether the data corresponding to the AppSel mode switching instruction is in the supported parameter list of the LPO optical module, and when the corresponding data is in the supported parameter list of the LPO optical module, verifying whether its value is within a preset threshold range.

[0010] In some implementations, any of the LPO optical modules returns a first flag indicating that the setting is correct to the switch after the instruction validity check passes, and returns a second flag indicating that the setting is incorrect to the switch after the instruction validity check fails.

[0011] In some implementations, the SI-S series parameters include one or more of the TEQ, REQ-Pre, REQ-Post, and R-Amp parameters.

[0012] Secondly, this application provides an optical path signal integrity control method applied to a switch, comprising the following steps: the switch adjusts the corresponding FIR parameters according to the insertion loss of each channel, and issues an AppSel mode switching command to the LPO optical module corresponding to each channel port to change the AppSel mode of the LPO optical module according to the adjustment of the FIR parameters, so that the corresponding LPO optical module first configures the corresponding SI-S series parameters according to the default AppSel mode agreed with the switch after power-on, and then performs a valid verification of the command after receiving the AppSel mode switching command, and updates the corresponding SI-S series parameters according to the AppSel mode switching command after the verification passes, and refuses to execute the parameter update if the verification fails.

[0013] In some implementations, the LPO optical module pre-stores multiple AppSel modes, each of which is associated with a set of predefined SI-S series parameters.

[0014] In some implementations, the predefined SI-S series parameters are preset values ​​obtained after preprocessing test samples under different switch port insertion losses and / or different temperature conditions.

[0015] In some implementations, the valid verification of the instruction includes: verifying whether the data corresponding to the AppSel mode switching instruction is in the supported parameter list of the LPO optical module, and when the corresponding data is in the supported parameter list of the LPO optical module, verifying whether its value is within a preset threshold range.

[0016] In some implementations, any of the LPO optical modules returns a first flag indicating that the setting is correct to the switch after the instruction validity check passes, and returns a second flag indicating that the setting is incorrect to the switch after the instruction validity check fails.

[0017] In some implementations, the SI-S series parameters include one or more of the TEQ, REQ-Pre, REQ-Post, and R-Amp parameters.

[0018] Thirdly, this application provides a method for controlling the integrity of optical path signals, comprising the following steps: After each LPO optical module is powered on, it configures the corresponding SI-S series parameters according to the default AppSel mode agreed upon with the switch. The switch adjusts the corresponding FIR parameters according to the insertion loss of each channel and sends an AppSel mode switching command to the LPO optical module corresponding to each channel port. The AppSel mode switching command is a command issued by the switch to the LPO optical module to change its AppSel mode based on the adjustment of the FIR parameters. Upon receiving the AppSel mode switching command, any LPO optical module performs a validity check on the command. If the check passes, it updates the corresponding SI-S series parameters according to the AppSel mode switching command. If the check fails, it refuses to perform the parameter update.

[0019] In some implementations, the LPO optical module pre-stores multiple AppSel modes, each of which is associated with a set of predefined SI-S series parameters.

[0020] In some implementations, the predefined SI-S series parameters are preset values ​​obtained after preprocessing test samples under different switch port insertion losses and / or different temperature conditions.

[0021] In some implementations, the valid verification of the instruction includes: verifying whether the data corresponding to the AppSel mode switching instruction is in the supported parameter list of the LPO optical module, and when the corresponding data is in the supported parameter list of the LPO optical module, verifying whether its value is within a preset threshold range.

[0022] In some implementations, any of the LPO optical modules returns a first flag indicating that the setting is correct to the switch after the instruction validity check passes, and returns a second flag indicating that the setting is incorrect to the switch after the instruction validity check fails.

[0023] In some implementations, the SI-S series parameters include one or more of the TEQ, REQ-Pre, REQ-Post, and R-Amp parameters.

[0024] Fourthly, this application provides an optical path signal integrity control system, comprising: a switch configured to: adjust corresponding FIR parameters according to the insertion loss of each channel, and send an AppSel mode switching command to the LPO optical module corresponding to each channel port, wherein the AppSel mode switching command is a command issued by the switch to the LPO optical module according to the FIR parameter adjustment, used to change its AppSel mode. An LPO optical module, communicatively connected to the switch, is configured to: configure corresponding SI-S series parameters according to the default AppSel mode agreed upon with the switch upon power-up, and perform command validity verification upon receiving the AppSel mode switching command; if the verification passes, update the corresponding SI-S series parameters according to the AppSel mode switching command; if the verification fails, refuse to execute the parameter update.

[0025] In some implementations, the LPO optical module pre-stores multiple AppSel modes, each of which is associated with a set of predefined SI-S series parameters.

[0026] In some implementations, the predefined SI-S series parameters are preset values ​​obtained after preprocessing test samples under different switch port insertion losses and / or different temperature conditions.

[0027] In some implementations, the valid verification of the instruction includes: verifying whether the data corresponding to the AppSel mode switching instruction is in the supported parameter list of the LPO optical module, and when the corresponding data is in the supported parameter list of the LPO optical module, verifying whether its value is within a preset threshold range.

[0028] In some implementations, any of the LPO optical modules returns a first flag indicating that the setting is correct to the switch after the instruction validity check passes, and returns a second flag indicating that the setting is incorrect to the switch after the instruction validity check fails.

[0029] In some implementations, the SI-S series parameters include one or more of the TEQ, REQ-Pre, REQ-Post, and R-Amp parameters.

[0030] Fifthly, this application provides an LPO optical module, comprising: a first communication interface configured to: communicate with a switch via a protocol and receive an AppSel mode switching instruction, wherein the AppSel mode switching instruction is an instruction issued by the switch to the LPO optical module to change its AppSel mode after adjusting the corresponding FIR parameters according to the insertion loss of each channel. A processing unit is configured to: upon power-on, configure the corresponding SI-S series parameters according to the default AppSel mode agreed upon with the switch; during normal operation, respond to the AppSel mode switching instruction received through the first communication interface, perform instruction validity verification; if the verification passes, update the corresponding SI-S series parameters according to the AppSel mode switching instruction; if the verification fails, refuse to execute the parameter update.

[0031] In some implementations, the LPO optical module further includes a storage unit configured to pre-store multiple AppSel modes, each AppSel mode being associated with a set of predefined SI-S series parameters.

[0032] In some implementations, the predefined SI-S series parameters are preset values ​​obtained after preprocessing test samples under different switch port insertion losses and / or different temperature conditions.

[0033] In some implementations, the valid verification of the instruction includes: verifying whether the data corresponding to the AppSel mode switching instruction is in the supported parameter list of the LPO optical module, and when the corresponding data is in the supported parameter list of the LPO optical module, verifying whether its value is within a preset threshold range.

[0034] In some implementations, any of the LPO optical modules returns a first flag indicating that the setting is correct to the switch after the instruction validity check passes, and returns a second flag indicating that the setting is incorrect to the switch after the instruction validity check fails.

[0035] In some implementations, the SI-S series parameters include one or more of the TEQ, REQ-Pre, REQ-Post, and R-Amp parameters.

[0036] Sixthly, this application provides a switch comprising: The control unit is configured to: adjust the corresponding FIR parameters according to the insertion loss of each channel, and send an AppSel mode switching command to the LPO optical module corresponding to each channel port through the second communication interface. The AppSel mode switching command is a command issued to the LPO optical module according to the FIR parameter adjustment to change its AppSel mode. The second communication interface is configured to: communicate with the LPO optical module via protocol and issue AppSel mode switching commands.

[0037] In some implementations, the LPO optical module pre-stores multiple AppSel modes, each of which is associated with a set of predefined SI-S series parameters.

[0038] In some implementations, the predefined SI-S series parameters are preset values ​​obtained after preprocessing test samples under different switch port insertion losses and / or different temperature conditions.

[0039] In some implementations, the valid verification of the instruction includes: verifying whether the data corresponding to the AppSel mode switching instruction is in the supported parameter list of the LPO optical module, and when the corresponding data is in the supported parameter list of the LPO optical module, verifying whether its value is within a preset threshold range.

[0040] In some implementations, any of the LPO optical modules returns a first flag indicating that the setting is correct to the switch after the instruction validity check passes, and returns a second flag indicating that the setting is incorrect to the switch after the instruction validity check fails.

[0041] In some implementations, the SI-S series parameters include one or more of the TEQ, REQ-Pre, REQ-Post, and R-Amp parameters.

[0042] Compared with the prior art, this application has at least the following advantages or beneficial effects: This application proposes an optical path signal integrity control method. It improves the matching efficiency between the LPO optical module and the switch by combining the SI-S series parameters of the LPO optical module with the LPO's AppSel mode and the insertion loss of different channels of the switch. In this method, after the switch adjusts the FIR parameters based on the measured channel characteristics, it triggers the LPO optical module to synchronously switch to AppSel mode via a standardized AppSel mode switching command. The LPO optical module then matches the corresponding SI-S series parameters according to the AppSel mode switch. This not only greatly expands the control domain of the LPO optical module's output signal integrity but also effectively improves the environmental adaptability of the output signal and the lower limit of the bit error rate, thereby improving the matching efficiency between the LPO optical module and the switch. This effectively reduces unnecessary manpower construction and maintenance costs at the application end and effectively reduces various errors and inaccuracies introduced by manual debugging. In short, this method can solve the signal integrity problem while maintaining the low power consumption and low cost advantages of the LPO module. Furthermore, the optical path signal integrity control method in this application is simple and efficient, and can be well integrated into the firmware of LPO optical modules with limited memory space, without having to replace the storage space of the LPO optical module due to the introduction of additional algorithms. Attached Figure Description

[0043] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of the structure of an optical network built using LPO optical modules in conventional mode; Figure 2 This is a flowchart of an embodiment of an optical path signal integrity control method according to this application; Figure 3 This is a flowchart of yet another embodiment of the optical path signal integrity control method of this application. Detailed Implementation

[0045] 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, and not all embodiments. It should be understood that this application is not limited to the exemplary embodiments described herein.

[0046] In this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying any such actual relationship or order between these entities or operations.

[0047] Application Overview To facilitate understanding of the technical solutions provided in this application, some concepts will be introduced below.

[0048] 1. LPO Optical Module (Linear-driver Pluggable Optics) Unlike traditional optical modules that use DSPs or CDRs for complex signal processing, LPO optical modules use linear analog drivers and linear receivers to directly amplify and equalize signals in the analog domain, without retiming or complex digital processing of the digital signals. Therefore, they offer advantages over traditional optical modules in terms of low power consumption, low latency, and low cost.

[0049] 2. DSP (Digital Signal Processor) A dedicated microprocessor for performing high-speed mathematical operations (such as filtering, equalization, encoding / decoding) on ​​digital signals. This allows it to compensate for damage to optical / electrical signals during long-distance transmission.

[0050] 3. CDR (Clock Data Recovery) A circuit that can extract a clock signal from an input data stream, and use the clock signal to resample and reshape the data, outputting a clean, clock-synchronized data stream.

[0051] 4. FIR (Finite Impulse Response) - Finite Impulse Response Filter A digital filter whose output is determined only by the current and past input values, and is independent of past output values. It is primarily used for pre-emphasis or deemphasis at the transmitting end. By pre-distorting the signal before transmission, it can pre-compensate for the attenuation of high-frequency signals by the channel (such as PCB traces or optical fibers), thus obtaining a larger eye diagram at the receiving end.

[0052] 5. VGAIN (Gain Control Voltage) - Transmitter Gain Control A voltage signal used to control the gain of a laser driver or modulator. By adjusting this voltage, the modulation amplitude of the emitted light signal can be changed.

[0053] 6. LUT (Look-Up Table) A pre-calculated table of values ​​can directly output the corresponding results by inputting an address or index, without requiring real-time calculations.

[0054] 7. 20GPKD (Integrated Peak Detector, 20GHz) - 20GHz Output Amplitude Monitoring An integrated peak detection circuit with an operating bandwidth up to 20 GHz. It can be used to monitor the amplitude of high-speed signals (such as transmitted or received signals) in real time. This monitoring result can be fed back to the control system (e.g., via FW) to automatically adjust VGAIN or other parameters to maintain a constant signal amplitude and resist the effects of temperature and device aging.

[0055] 8. FW (Firmware) - Optical module firmware Embedded software stored in the non-volatile memory inside the optical module.

[0056] 9. CMIS (Common Management Interface Specification) - General Management Interface Specification for Optical Modules This is a standardized management protocol defined by the MSA organization for managing high-speed pluggable optical modules (such as QSFP-DD and OSFP). It replaces the older protocols SFF-8636 and CMIS, providing richer and more flexible management functions, especially supporting the configuration and management of modules in various application modes.

[0057] 10. AppSel (Applications select) - Optical module application mode A feature defined by the CMIS protocol allows an optical module to support multiple different operating modes or "applications".

[0058] 11. SI-S (Signal Integrity Setting) A set of configurable parameters is used to optimize the transmit and receive performance of the optical module to cope with different channel conditions and system requirements.

[0059] 12. TEQ (Manual Fixed Tx Input Equalizer Control) - Manual Equalization Control at the Generator End A manually configured, fixed transmitter input equalizer.

[0060] 13. REQ-Pre / REQ-Post (Rx output equalization) - Receiver output equalization The equalizer located at the optical module receiver is used to shape the signal before it is output to the host. REQ-Pre: Forward cursor equalization. Adjusts the effect of the current bit on the next bit. REQ-Post: Backward cursor equalization. Adjusts the effect of the current bit on the previous bit (this is the most important equalization component).

[0061] 14. R-Amp (Rx output amplitude) - Receiver output amplitude The voltage amplitude of the electrical signal output by the receiving end.

[0062] It's worth noting that with the rapid development of the optical communication industry, and driven by the massive demand from 5G and artificial intelligence (AI) in recent years, the market demand for optical modules has grown rapidly. Data center network speeds are gradually evolving from 100G, 200G, and 400G to 800G and 1.6T, and may even reach 3.2T in the near future. This explosive growth in demand for data center optical networks has quickly impacted the optical module supply side, directly driving the continuous improvement of optical module speeds. However, technological iteration is not simply about doubling the numbers. After reaching the 400G speed stage, while solving the problem of increasing data transmission rates, we must also face challenges brought by increased power consumption, demanding packaging methods, and the cost of optical modules.

[0063] In the early days, a 10G optical module consumed only about 1W of power. However, current optical modules (400G and 800G) generally consume over 10W. This dramatic increase in power consumption has led to a rapid rise in their share of the total power consumption of the entire equipment, currently accounting for 40% or more. This places a significant burden on the energy utilization and costs of the entire data center. To address these issues, the industry has explored various approaches, with LPO optical modules being one of the main focuses.

[0064] LPO optical modules adopt a linear drive strategy, replacing DSPs or CDRs with transimpedance amplifiers (TIAs) and drivers that have excellent linearity and equalization capabilities. This avoids the disadvantages of high power consumption and high link latency of DSP or CDR optical modules, and is more in line with the current data communication needs of data centers with short distances, high bandwidth, low power consumption and low latency.

[0065] Compared to traditional optical modules, LPO optical modules offer advantages primarily in four aspects: low power consumption, low cost, low latency, and ease of maintenance. However, correspondingly, due to the lack of DSP and CDR intervention, linear drive inevitably leads to increased bit error rate and excessive module channel insertion loss. Especially under different temperatures, if different switches need to maintain low bit error rate and channel insertion loss, the current industry practice is to individually match LPO modules with different FIR or other parameters for different devices, which incurs significant construction costs. Furthermore, subsequent maintenance also presents difficulties and gradually increasing costs. In addition, some similar technical solutions add extra circuitry to the LPO optical module hardware to avoid high bit error rate and high channel insertion loss, and some require professional production personnel for debugging and matching. This not only increases the cost of LPO optical modules but also, to some extent, increases their power consumption. Therefore, effectively reducing various costs and solving these problems at the root (LPO series optical modules) has always been one of the research directions for researchers.

[0066] To address the aforementioned issues, this application proposes an optical path signal integrity control method and system. This method combines the SI-S series parameters of the LPO optical module with its AppSel mode and the insertion loss characteristics of different switch channels. This collaborative mechanism of "switch active guidance + optical module intelligent response" automates and refines parameter configuration, fundamentally solving the signal integrity challenge of LPO technology in large-scale deployments.

[0067] After introducing the basic principles of this application, various non-limiting embodiments of this application will be described in detail below with reference to the accompanying drawings. Unless otherwise specified, the various embodiments and features described below can be combined with each other.

[0068] Exemplary Method 1 First, it should be noted that under existing optical communication network conditions, the application of LPO optical modules is as follows: Figure 1 As shown, the switch adjusts the parameters of the LPO optical module via the IIC bus and the parameter adjustment protocol agreed upon with the optical module manufacturer to match the data reception and transmission at the other end. The current mainstream solution is to preset or configure the corresponding adaptive matching VGAIN parameters in the LPO optical module to solve the switch's LOSS (channel insertion loss) problem to some extent.

[0069] However, the inventors discovered that, in addition to VGAIN being the parameter that has the greatest impact on the signal link, the matching of the FIR parameters on the switch side and the SI-S parameters of the module is also very important in terms of the accuracy, low bit error rate and control efficiency of LPO optical module signal control. It can cover application scenarios that VGAIN control cannot cover and can effectively improve the lower limit of the bit error rate and the upper limit of the signal integrity of the LPO module.

[0070] Based on this, please refer to Figure 2 This application proposes an optical path signal integrity control method, which includes the following steps: Step S101: After each LPO optical module is powered on, configure the corresponding SI-S series parameters according to the default AppSel mode agreed with the switch.

[0071] In the above steps, after the LPO optical module is plugged into the switch and powered on, it needs to immediately establish an initial, communicable link. At this time, the LPO optical module is unaware of the specific environment it is connected to (switch model, port insertion loss, etc.), so it pre-agrees with the switch on a default AppSel mode (e.g., 8×100G, high LOSS mode). The LPO optical module's firmware automatically loads the set of default SI-S series parameters bound to this default AppSel mode and configures them on its internal linear drivers, amplifiers, and other hardware. This allows the LPO optical module to start working with a relatively accurate and conservative configuration.

[0072] This ensures that the LPO optical module can always establish a basic connection with the switch in its initial state, enabling subsequent fine-tuning and greatly simplifying the deployment process. Furthermore, this stable default state provides a reliable reference point for subsequent measurement of channel characteristics and parameter adjustments by the switch.

[0073] For example, taking a standard 800G LPO optical module as an example, an 800G LPO optical module can initially be configured with four main categories of AppSel modes: 8×100G, 4×200G, 2×400G, and 1×800G. Then, each main category is further divided into three subcategories of AppSel modes for different switch scenarios: high loss, normal loss, and low loss. In this way, each 800G LPO optical module can define at least 12 AppSel modes.

[0074] Step S102: The switch adjusts the corresponding FIR parameters according to the insertion loss of each channel, and sends an AppSel mode switching command to the LPO optical module corresponding to each channel port. The AppSel mode switching command is a command issued by the switch to the LPO optical module according to the FIR parameter adjustment to change its AppSel mode.

[0075] In the above steps, due to the differences in loss between different ports of the switch, if the current port needs to output a relatively high-quality signal, different FIR parameters need to be adjusted to match the physical characteristics of the current port. That is, the ASIC chip on the switch continuously evaluates the signal quality of each port channel through its SerDes (serializer / deserializer), either continuously or after power-on, thereby sensing the specific channel insertion loss. Based on this sensing, the switch first adjusts its own internal FIR filter parameters. After adjusting its own FIR parameters, the switch needs to notify the LPO optical module to cooperate accordingly. Then, based on the FIR parameter adjustment, the switch issues an AppSel mode switching command to the LPO optical module through the standard CMIS management interface, instructing it to switch to AppSel mode to configure the corresponding SI-S series parameters.

[0076] In the above steps, by converting the relatively abstract channel insertion loss of the switch into a specific, executable "AppSel mode switching command", the parameter matching between the switch and the LPO optical module can be simplified.

[0077] For example, taking a channel port that needs to issue an AppSel mode switching command as an example, the LPO optical module corresponding to the channel port is a regular 800G LPO optical module. The switch can generate and issue a corresponding AppSel mode switching command (for example, switching from the default first AppSel mode to the optimized second AppSel mode) according to the current insertion loss level (high, medium, low) and service requirements (such as whether 2×400G or 1×800G is required).

[0078] Step S103: Any LPO optical module responds to the received AppSel mode switching command by performing command validity verification. If the verification passes, the corresponding SI-S series parameters are updated according to the AppSel mode switching command. If the verification fails, the parameter update is refused.

[0079] In the above steps, the LPO optical module does not blindly execute the AppSel mode switching command received from the switch. It first performs a command validity check to prevent misconfiguration. Only after the check passes does it update the corresponding SI-S series parameters according to the AppSel mode switching command; that is, it begins loading the set of SI-S parameters required by the AppSel mode switching command that best matches the current switch FIR settings. This update process can be as follows: the LPO optical module first switches the AppSel mode to the corresponding state according to the AppSel mode switching command, and then directly calls the pre-configured SI-S series parameters according to the switched AppSel mode. Alternatively, the LPO optical module first switches the AppSel mode to the corresponding state according to the AppSel mode switching command, and then adjusts the SI-S series parameters according to the pre-set constraints of the switched AppSel mode. For example, if the constraint requires a parameter to be within the range of -0.2 to +0.2, then if the parameter is not within this range, it will be adjusted to fall within that range. In this way, by using a series of preset conditions for each "AppSel mode", the parameters can be adjusted within a range.

[0080] Because the SI-S parameters loaded on the LPO optical module are a customized solution that is precisely matched to the actual channel insertion loss and switch FIR settings, rather than a general compromise solution. This matching and collaborative optimization between the switch-side FIR parameters and the LPO optical module-side SI-S parameters can more comprehensively compensate for signal impairments than adjusting either parameter individually, thus ensuring signal integrity at the system level.

[0081] It should be noted that current LPO optical module signal integrity control methods mostly rely on individually adjusting the module's VGAIN parameters. Since the insertion loss varies across each port of a switch, individual VGAIN control may be insufficient to cover all application scenarios if matching the insertion loss of different ports on different switches is required. This leads to insufficient accuracy and significant fluctuations in LPO module integrity under different operating conditions. Consequently, requiring manual review and configuration of each switch, the workload for any data center becomes an extremely labor-intensive and resource-intensive undertaking. Furthermore, in addition to increased costs, the human error and mistakes introduced by manual equipment configuration are also considerable. All of these factors can potentially cause significant economic losses and negative impacts on the client.

[0082] In the above embodiment, unlike the approach of adjusting the VGAIN parameters of a separate module, this approach improves the matching efficiency between the LPO optical module and the switch by combining the SI-S series parameters of the LPO optical module with the LPO's AppSel mode and the insertion loss of different channels of the switch. In this method, after the switch adjusts the FIR parameters according to the measured channel characteristics, it triggers the LPO optical module to synchronously switch to AppSel mode via a standardized AppSel mode switching command. The LPO optical module then matches the corresponding SI-S series parameters according to the AppSel mode switch. This not only greatly expands the control domain of the LPO optical module's output signal integrity but also effectively improves the environmental adaptability of the output signal and the lower limit of the bit error rate, thereby improving the matching efficiency between the LPO optical module and the switch. This effectively reduces unnecessary manpower construction and maintenance costs at the application end and effectively reduces various errors and inaccuracies introduced by manual debugging. In other words, this method can solve the signal integrity problem while maintaining the low power consumption and low cost advantages of the LPO module. Furthermore, the optical path signal integrity control method in this application is simple and efficient, and can be well integrated into the firmware of LPO optical modules with limited memory space, without having to replace the storage space of the LPO optical module due to the introduction of additional algorithms.

[0083] Based on the aforementioned scheme, in some implementations of this application, the LPO optical module pre-stores multiple AppSel modes, and each AppSel mode is associated with a set of predefined SI-S series parameters.

[0084] In the above implementation, a mechanism of pre-storage and dynamic association transforms complex real-time signal processing problems into efficient and accurate pattern matching problems. This solution pre-builds a "parameter database" within the firmware of the LPO optical module. Specifically, the LPO optical module pre-stores multiple AppSel modes: for different application scenarios (taking an 800G LPO optical module as an example, it can pre-store data path configurations such as 8×100G and 4×200G) and physical conditions (such as high, medium, and low channel insertion loss).

[0085] At the same time, for each AppSel mode, a set of matching SI-S series parameters are pre-calculated and bound (which may include parameters such as TEQ, REQ-Pre, REQ-Post, and R-Amp, for example). These parameters may be the optimal solution set customized by the manufacturer for specific operating conditions based on a large number of tests and simulations.

[0086] In this way, by adopting a "one scenario, one set of customized parameters" approach, it is ensured that in any operating mode, the LPO optical module loads a parameter set that has been deeply optimized for that scenario, thereby fundamentally guaranteeing the lower limit of signal quality and achieving optimal performance. Furthermore, this simplifies the complex signal integrity control problem into an "AppSel mode selection" operation. The switch does not need to know the complex details of the underlying parameters; it only needs to issue an AppSel mode switching command to trigger the LPO optical module to complete the precise configuration of the entire set of parameters, greatly reducing the technical threshold and cost of operation and maintenance. Moreover, since a complete set of SI-S parameters is bound to one AppSel mode, all relevant parameters will be loaded synchronously and consistently during switching, avoiding the instantaneous signal instability problems that may be caused by setting parameters one by one, and greatly improving the reliability of the system reconfiguration process.

[0087] In summary, this pre-stored and associated scheme enables LPO optical modules to maintain low bit error rate and low channel insertion loss without the intervention of DSP and CDR.

[0088] It should be noted that different switch loss conditions and SI-S series parameters can be combined through the "AppSel mode" of the LPO optical module, so that theoretically all modes that the CMIS interface can define can be supported as needed.

[0089] For example, in some implementations of this application, the predefined SI-S series parameters are preset values ​​obtained after preprocessing test samples under different switch port insertion losses and / or different temperature conditions. Therefore, these predefined SI-S series parameters can reduce the problem of increased bit error rate of LPO optical modules in relatively special operating environments.

[0090] In the above implementation, because the parameters are derived from extensive testing in real-world environments, each preset value is deeply optimized for specific physical conditions. This ensures that the LPO optical module maintains low bit error rate and high signal quality under various complex operating conditions, significantly improving the product's environmental adaptability and reliability. Furthermore, by bringing the most complex debugging work forward to the R&D stage, resource-intensive parameter traversal and optimization are avoided at each usage site, achieving an optimal balance between R&D costs and deployment and maintenance efficiency.

[0091] Furthermore, in some implementations of this application, the SI-S series parameters may include one or more of the TEQ, REQ-Pre, REQ-Post, and R-Amp parameters. This implementation, by integrating transmitter equalization, receiver equalization, and amplitude control into a unified framework for coordinated configuration, avoids the limitations of single-parameter adjustment and enables optimization of overall signal quality at the system level. Since the TEQ, REQ-Pre, REQ-Post, and R-Amp parameter sets cover the entire signal link from transmission to reception, when the SI-S series parameters fully include these four types of data, it can comprehensively handle the entire process of transmitter pre-compensation, channel loss compensation, inter-symbol interference cancellation, and signal level restoration, further ensuring end-to-end signal integrity.

[0092] Based on the aforementioned scheme, in some implementations of this application, the step of validating the instruction includes: verifying whether the data corresponding to the AppSel mode switching instruction is in the supported parameter list of the LPO optical module, and when the corresponding data is in the supported parameter list of the LPO optical module, verifying whether its value is within a preset threshold range.

[0093] In the above implementation, by first verifying whether the data corresponding to the AppSel mode switching command is in the LPO optical module's supported parameter list, unauthorized or erroneous command codes can be identified and rejected, preventing illegal requests at the source. Next, for commands that pass the validity check, the specific parameter values ​​are further verified to ensure they are within the "preset threshold range" allowed by the LPO optical module hardware. This second line of defense prevents situations where, although the command code is legal, excessively extreme parameter values ​​may cause hardware malfunctions or damage to the LPO optical module.

[0094] In other words, the dual verification mechanism can effectively prevent the loading of illegal or dangerous parameters due to switch bugs, transmission errors or configuration mistakes, protecting LPO optical modules from damage such as electrical overstress, and greatly enhancing the fault tolerance and long-term reliability of LPO optical modules and switches when faced with abnormal commands.

[0095] In order to transform the switch from a simple "command issuer" to a "process monitor" and enable it to know the execution results of its control commands in real time, and to further enhance the collaboration between the switch and the LPO optical module, in some implementations of this application, any LPO optical module needs to return a first flag bit (such as logic "1") indicating that the setting is correct after the command validity verification passes, and a second flag bit (such as logic "0") indicating that the setting is incorrect after the command validity verification fails.

[0096] To enable those skilled in the art to understand this application more intuitively, a specific example will be used here for illustration.

[0097] This example uses a standard 800G LPO optical module. Assuming the default AppSel mode upon power-up is "8×100G, High Loss Mode" (AppSel mode is AppSel 1), when the LPO optical module is running normally, the switch switches the high-loss ports to 2×400G (requiring the corresponding LPO optical module's AppSel mode to switch to AppSel 2), the standard-loss ports to 1×800G (requiring the corresponding LPO optical module's AppSel mode to switch to AppSel 3), and the low-loss ports to 4×200G (requiring the corresponding LPO optical module's AppSel mode to switch to AppSel 4). The flow of this optical path signal integrity control method is as follows: (1) The LPO optical module is powered on successfully and the SI-S series parameters of the default AppSel mode (AppSel 1) are configured. (2) Adjust the FIR parameters of different loss ports on the switch (this process does not distinguish the order and can be adjusted synchronously or asynchronously): 1) Adjust the FIR parameters of the high LOSS port section, and at the same time issue an AppSel mode switching command to the LPO optical module corresponding to the high LOSS port section (for ease of explanation, it will be referred to as the first LPO optical module from now on), requiring it to switch the AppSel mode to AppSel 2. 2) Adjust the FIR parameters of the regular LOSS port section, and at the same time issue an AppSel mode switching command to the LPO optical module corresponding to the regular LOSS port section (for ease of explanation, it will be referred to as the second LPO optical module from now on), requiring it to switch the AppSel mode to AppSel 3; 3) Adjust the FIR parameters of the low LOSS port section, and at the same time issue an AppSel mode switching command to the LPO optical module corresponding to the low LOSS port section (for ease of explanation, it will be referred to as the third LPO optical module from now on), requiring it to switch the AppSel mode to AppSel 4.

[0098] (3) The corresponding LPO optical module responds to the AppSel mode switching command and begins to operate: After receiving the corresponding AppSel mode switching command, the first LPO optical module first performs a command validity check. If the check passes, it sets its AppSel mode to AppSel 2 and configures the corresponding SI-S series parameters according to AppSel 2. If the check fails, it refuses to perform the parameter update and keeps the AppSel mode as AppSel 1.

[0099] Similarly, after receiving the corresponding AppSel mode switching command, the second LPO optical module first performs a command validity check. If the check passes, it sets its AppSel mode to AppSel 3 and configures the corresponding SI-S series parameters according to AppSel 4. If the check fails, it refuses to perform the parameter update and keeps the AppSel mode as AppSel 1.

[0100] Similarly, after receiving the corresponding AppSel mode switching command, the third LPO optical module first performs a command validity check. If the check passes, it sets its AppSel mode to AppSel 4 and configures the corresponding SI-S series parameters according to AppSel 4. If the check fails, it refuses to perform the parameter update and keeps the AppSel mode as AppSel 1.

[0101] In this process, in order for the switch to know the switching results of the first LPO optical module, the second LPO optical module, and the third LPO optical module in a timely manner, these three LPO optical modules can also be instructed to return a first flag indicating that the setting is correct to the switch after the instruction validity verification passes, and to return a second flag indicating that the setting is incorrect to the switch after the instruction validity verification fails.

[0102] Exemplary Method Two Please see Figure 3 This optical path signal integrity control method originates from the same inventive concept as the solution in "Exemplary Method One," but differs in that it is applied to LPO optical modules and includes the following steps: After each LPO optical module is powered on, it configures the corresponding SI-S series parameters according to the default AppSel mode agreed upon with the switch. Upon receiving an AppSel mode switching command, any LPO optical module performs a command validity check. If the check passes, it updates the corresponding SI-S series parameters according to the AppSel mode switching command; otherwise, it refuses to perform the parameter update. The AppSel mode switching command is a command issued by the switch to the LPO optical module to change its AppSel mode after adjusting the corresponding FIR parameters based on the insertion loss of each channel.

[0103] In the above method, the operation flow of the LPO optical module in the optical path signal integrity control method is as follows: (1) Initialization phase: After the LPO optical module is powered on successfully, it automatically enters a preset default AppSel mode and loads its corresponding SI-S series parameters to ensure the establishment of a basic but stable communication connection with the switch; (2) Dynamic optimization phase: The LPO optical module continuously listens for AppSel mode switching commands from the switch. The AppSel mode switching command is essentially a "coordination signal" that the switch commands the LPO optical module to perform collaborative optimization after completing its own FIR parameter adjustment; (3) Secure execution phase: Before responding to the AppSel mode switching command, the LPO module performs a mandatory validity check. Only valid and secure commands that pass the check will trigger the update of the SI-S parameters; otherwise, execution will be refused, and the original state will be maintained.

[0104] The default AppSel mode of the LPO optical module ensures convenient deployment and reliable initial connection, while the subsequent command response mechanism gives it the ability to dynamically and accurately optimize according to actual working conditions, balancing ease of use and high performance.

[0105] Specifically, the implementation process of the optical path signal integrity control method applied to LPO optical modules is described in the section "Exemplary Method 1", and will not be repeated here.

[0106] Based on the aforementioned scheme, in some implementations of this application, the LPO optical module pre-stores multiple AppSel modes, and each AppSel mode is associated with a set of predefined SI-S series parameters.

[0107] Based on the aforementioned scheme, in some implementations of this application, the predefined SI-S series parameters are preset values ​​obtained after preprocessing test samples under different switch port insertion losses and / or different temperature conditions.

[0108] Based on the aforementioned scheme, in some implementations of this application, the step of validating the instruction includes: verifying whether the data corresponding to the AppSel mode switching instruction is in the supported parameter list of the LPO optical module, and when the corresponding data is in the supported parameter list of the LPO optical module, verifying whether its value is within a preset threshold range.

[0109] Based on the aforementioned scheme, in some implementations of this application, any of the LPO optical modules returns a first flag indicating that the setting is correct to the switch after the instruction validity verification passes, and returns a second flag indicating that the setting is incorrect to the switch after the instruction validity verification fails.

[0110] Based on the aforementioned scheme, in some implementations of this application, the SI-S series parameters include one or more of the TEQ, REQ-Pre, REQ-Post, and R-Amp parameters.

[0111] Exemplary Method 3 This optical path signal integrity control method originates from the same inventive concept as the solution in "Exemplary Method 1". The difference is that this method is applied to a switch and includes the following steps: The switch adjusts the corresponding FIR parameters according to the insertion loss of each channel, and sends an AppSel mode switching command to the LPO optical module corresponding to each channel port to change the AppSel mode of the LPO optical module according to the FIR parameter adjustment. This allows the corresponding LPO optical module to configure the corresponding SI-S series parameters according to the default AppSel mode agreed with the switch after power-on. Then, after receiving the AppSel mode switching command, the switch performs a command validity verification. If the verification passes, the corresponding SI-S series parameters are updated according to the AppSel mode switching command. If the verification fails, the parameter update is refused.

[0112] In the above method, the operation flow of the switch in the optical path signal integrity control method is as follows: (1) Based on real-time signal quality feedback, the switch dynamically optimizes the filter coefficients through an adaptive algorithm to overcome physical channel loss and ensure the reliability of the high-speed data link. Then, the switch sends an AppSel mode switching command to the LPO optical module to change the AppSel mode of the LPO optical module, so that it can perform synchronous optimization. Thus, the switch can act as the master of optical path signal integrity control, and simply and conveniently realize the parameter configuration matching between the switch and the LPO optical module, fundamentally solving the signal integrity problem of LPO technology in large-scale deployment.

[0113] Specifically, the implementation process of the optical path signal integrity control method applied to the switch described above is described in the "Exemplary Method 1" section, and will not be repeated here.

[0114] Based on the aforementioned scheme, in some implementations of this application, the LPO optical module pre-stores multiple AppSel modes, and each AppSel mode is associated with a set of predefined SI-S series parameters.

[0115] Based on the aforementioned scheme, in some implementations of this application, the predefined SI-S series parameters are preset values ​​obtained after preprocessing test samples under different switch port insertion losses and / or different temperature conditions.

[0116] Based on the aforementioned scheme, in some implementations of this application, the step of validating the instruction includes: verifying whether the data corresponding to the AppSel mode switching instruction is in the supported parameter list of the LPO optical module, and when the corresponding data is in the supported parameter list of the LPO optical module, verifying whether its value is within a preset threshold range.

[0117] Based on the aforementioned scheme, in some implementations of this application, any of the LPO optical modules returns a first flag indicating that the setting is correct to the switch after the instruction validity verification passes, and returns a second flag indicating that the setting is incorrect to the switch after the instruction validity verification fails.

[0118] Based on the aforementioned scheme, in some implementations of this application, the SI-S series parameters include one or more of the TEQ, REQ-Pre, REQ-Post, and R-Amp parameters.

[0119] Exemplary System This application provides an optical path signal integrity control system, comprising: a switch configured to: adjust corresponding FIR parameters according to the insertion loss of each channel, and send an AppSel mode switching command to the LPO optical module corresponding to each channel port; wherein the AppSel mode switching command is a command issued by the switch to the LPO optical module according to the FIR parameter adjustment, used to change its AppSel mode; and an LPO optical module communicatively connected to the switch, configured to: configure corresponding SI-S series parameters according to the default AppSel mode agreed with the switch upon power-up, and perform command validity verification upon receiving the AppSel mode switching command; if the verification passes, update the corresponding SI-S series parameters according to the AppSel mode switching command; otherwise, refuse to execute the parameter update.

[0120] For the specific implementation process of the above system, please refer to the optical path signal integrity control method provided in the "Exemplary Method 1" section, which will not be repeated here.

[0121] Based on the aforementioned scheme, in some implementations of this application, the LPO optical module pre-stores multiple AppSel modes, and each AppSel mode is associated with a set of predefined SI-S series parameters.

[0122] Based on the aforementioned scheme, in some implementations of this application, the predefined SI-S series parameters are preset values ​​obtained after preprocessing test samples under different switch port insertion losses and / or different temperature conditions.

[0123] Based on the aforementioned scheme, in some implementations of this application, the step of validating the instruction includes: verifying whether the data corresponding to the AppSel mode switching instruction is in the supported parameter list of the LPO optical module, and when the corresponding data is in the supported parameter list of the LPO optical module, verifying whether its value is within a preset threshold range.

[0124] Based on the aforementioned scheme, in some implementations of this application, any of the LPO optical modules returns a first flag indicating that the setting is correct to the switch after the instruction validity verification passes, and returns a second flag indicating that the setting is incorrect to the switch after the instruction validity verification fails.

[0125] Based on the aforementioned scheme, in some implementations of this application, the SI-S series parameters include one or more of the TEQ, REQ-Pre, REQ-Post, and R-Amp parameters.

[0126] Exemplary LPO optical module This application provides an LPO optical module, comprising: a first communication interface configured to communicate with a switch via a protocol and receive an AppSel mode switching instruction, wherein the AppSel mode switching instruction is an instruction issued by the switch to the LPO optical module to change its AppSel mode after adjusting the corresponding FIR parameters according to the insertion loss of each channel; and a processing unit configured to: configure the corresponding SI-S series parameters according to the default AppSel mode agreed upon with the switch upon power-on; and during normal operation, respond to the AppSel mode switching instruction received through the first communication interface, perform instruction validity verification, and if the verification passes, update the corresponding SI-S series parameters according to the AppSel mode switching instruction; otherwise, refuse to perform parameter update.

[0127] For the specific implementation process of the LPO optical module described above, please refer to the optical path signal integrity control method provided in the "Exemplary Method 1" section, which will not be repeated here.

[0128] Based on the aforementioned scheme, in some implementations of this application, the LPO optical module pre-stores multiple AppSel modes, and each AppSel mode is associated with a set of predefined SI-S series parameters.

[0129] Based on the aforementioned scheme, in some implementations of this application, the predefined SI-S series parameters are preset values ​​obtained after preprocessing test samples under different switch port insertion losses and / or different temperature conditions.

[0130] Based on the aforementioned scheme, in some implementations of this application, the step of validating the instruction includes: verifying whether the data corresponding to the AppSel mode switching instruction is in the supported parameter list of the LPO optical module, and when the corresponding data is in the supported parameter list of the LPO optical module, verifying whether its value is within a preset threshold range.

[0131] Based on the aforementioned scheme, in some implementations of this application, any of the LPO optical modules returns a first flag indicating that the setting is correct to the switch after the instruction validity verification passes, and returns a second flag indicating that the setting is incorrect to the switch after the instruction validity verification fails.

[0132] Based on the aforementioned scheme, in some implementations of this application, the SI-S series parameters include one or more of the TEQ, REQ-Pre, REQ-Post, and R-Amp parameters.

[0133] Exemplary switch This application provides a switch, comprising: a control unit configured to: adjust corresponding FIR parameters according to the insertion loss of each channel, and send an AppSel mode switching command to the LPO optical module corresponding to each channel port through a second communication interface, wherein the AppSel mode switching command is a command issued to the LPO optical module according to the FIR parameter adjustment, for changing its AppSel mode; and a second communication interface configured to: perform protocol communication with the LPO optical module and issue the AppSel mode switching command.

[0134] For the specific implementation process of the above-mentioned switch, please refer to the optical path signal integrity control method provided in the "Exemplary Method 1" section, which will not be repeated here.

[0135] Based on the aforementioned scheme, in some implementations of this application, the LPO optical module pre-stores multiple AppSel modes, and each AppSel mode is associated with a set of predefined SI-S series parameters.

[0136] Based on the aforementioned scheme, in some implementations of this application, the predefined SI-S series parameters are preset values ​​obtained after preprocessing test samples under different switch port insertion losses and / or different temperature conditions.

[0137] Based on the aforementioned scheme, in some implementations of this application, the step of validating the instruction includes: verifying whether the data corresponding to the AppSel mode switching instruction is in the supported parameter list of the LPO optical module, and when the corresponding data is in the supported parameter list of the LPO optical module, verifying whether its value is within a preset threshold range.

[0138] Based on the aforementioned scheme, in some implementations of this application, any of the LPO optical modules returns a first flag indicating that the setting is correct to the switch after the instruction validity verification passes, and returns a second flag indicating that the setting is incorrect to the switch after the instruction validity verification fails.

[0139] Based on the aforementioned scheme, in some implementations of this application, the SI-S series parameters include one or more of the TEQ, REQ-Pre, REQ-Post, and R-Amp parameters.

[0140] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A method of controlling the integrity of an optical path signal, characterized by, The application is applied to LPO optical modules, and comprises the following steps: After each LPO optical module is powered on, SI-S series parameters corresponding to a default AppSel mode configuration agreed with the switch are configured; Any LPO optical module responds to receiving an AppSel mode switching instruction, performs instruction validity verification, and if the verification is passed, updates corresponding SI-S series parameters according to the AppSel mode switching instruction, and if the verification fails, refuses to perform parameter updating; wherein the AppSel mode switching instruction is an instruction for changing the AppSel mode of the LPO optical module issued by the switch to the LPO optical module according to FIR parameter adjustment.

2. The method of claim 1, wherein, The LPO optical module pre-stores a plurality of AppSel modes, and each AppSel mode is associated with a group of pre-defined SI-S series parameters.

3. A method of controlling the integrity of an optical path signal, characterized by, The application is applied to switches, and comprises the following steps: The switch adjusts corresponding FIR parameters according to channel insertion loss, and issues an AppSel mode switching instruction for changing the AppSel mode of the LPO optical module to the LPO optical module corresponding to each channel port according to FIR parameter adjustment, so that the corresponding LPO optical module first configures SI-S series parameters corresponding to a default AppSel mode configuration agreed with the switch after being powered on, and then performs instruction validity verification after accepting the AppSel mode switching instruction, and updates corresponding SI-S series parameters according to the AppSel mode switching instruction after the verification is passed, and refuses to perform parameter updating if the verification fails.

4. The method of claim 3, wherein, The LPO optical module pre-stores a plurality of AppSel modes, and each AppSel mode is associated with a group of pre-defined SI-S series parameters.

5. A method of controlling the integrity of an optical path signal, characterized by, The application comprises the following steps: After each LPO optical module is powered on, SI-S series parameters corresponding to a default AppSel mode configuration agreed with the switch are configured; The switch adjusts corresponding FIR parameters according to channel insertion loss, and issues an AppSel mode switching instruction for changing the AppSel mode of the LPO optical module to the LPO optical module corresponding to each channel port according to FIR parameter adjustment, so that the corresponding LPO optical module first configures SI-S series parameters corresponding to a default AppSel mode configuration agreed with the switch after being powered on, and then performs instruction validity verification after accepting the AppSel mode switching instruction, and updates corresponding SI-S series parameters according to the AppSel mode switching instruction after the verification is passed, and refuses to perform parameter updating if the verification fails. The LPO optical module pre-stores a plurality of AppSel modes, and each AppSel mode is associated with a group of pre-defined SI-S series parameters.

6. The method of claim 5, wherein, The pre-defined SI-S series parameters are preset values obtained by pre-processing test samples under different switch port insertion losses and / or different temperature conditions.

7. The method of claim 6, wherein, The pre-defined SI-S series parameters are preset values obtained by pre-processing test samples under different switch port insertion losses and / or different temperature conditions.

8. The method according to any one of claims 5-7, characterized in that, The performing instruction validity verification comprises: verifying whether the data corresponding to the AppSel mode switching instruction is in the support parameter list of the LPO optical module, and when the corresponding data is in the support parameter list of the LPO optical module, verifying whether the value is within a preset threshold range.

9. An optical path signal integrity control system, characterized by, Comprise: The switch is configured to adjust the corresponding FIR parameter according to the channel insertion loss condition, and send the AppSel mode switching instruction to the LPO optical module corresponding to each channel port, wherein the AppSel mode switching instruction is an instruction for changing the AppSel mode of the LPO optical module issued by the switch according to the FIR parameter adjustment condition; The LPO optical module is in communication connection with the switch, and is configured to: when powered on, configure the corresponding SI-S series parameters according to the default AppSel mode agreed with the switch, and when receiving the AppSel mode switching instruction, perform instruction validity verification, if the verification is passed, update the corresponding SI-S series parameters according to the AppSel mode switching instruction, and if the verification fails, refuse to execute parameter update.

10. The system of claim 9, wherein, A plurality of AppSel modes are pre-stored in the LPO optical module, and each AppSel mode is associated with a set of pre-defined SI-S series parameters.

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