Optimization method and system for optical interconnection simulation based on full-link parameters

Abstract

The application discloses an optical interconnection simulation method and system based on full-link parameter optimization, and the method comprises the following steps: processing an original signal based on an encoding module, a first feedforward equalizer and a continuous-time linear equalizer to obtain an electric signal to be processed; converting the electric signal to be processed into an optical signal to be sent through a driving circuit, and sending the optical signal to be sent through an optical channel; obtaining an electric signal to be received by inducting the optical signal to be sent through a photodiode, and processing the electric signal to be received through a transimpedance amplifier to obtain an electric signal to be recovered; processing the electric signal to be recovered through an automatic gain control continuous-time linear equalizer, a decision feedback equalizer and a second feedforward equalizer to obtain a target received signal corresponding to the original signal. The method solves the cooperative optimization problem of electric-optical-electric link distortion compensation and noise suppression in a high-speed optical interconnection system, and improves the simulation precision to a transmission scene verification requirement of 200Gbps (200 gigabits per second) or more.

Description

Technical Field

[0001] This invention relates to the field of optoelectronic communication technology, and in particular to an optical interconnect simulation method and system based on end-to-end parameter optimization. Background Technology

[0002] In the field of optical communication, optical interconnection is a crucial link in achieving efficient data transmission. Current mainstream optical interconnection methods rely on optical modules equipped with Digital Signal Processing (DSP) chips. At the system end, a high-frequency signal is generated via a serializer / deserializer (Serdes). This signal, after undergoing certain electrical path impairments, reaches the DSP receiver of the optical module. The DSP receiver processes and recovers the signal, then performs photoelectric modulation on the clean high-frequency signal through the optical chip before transmitting it to the receiver of the next port via the fiber optic channel. At the receiver, a high-speed photodetector converts the optical signal into current, which is then converted into a voltage signal by a trans-impedance amplifier (TIA). The DSP then performs digital signal processing on the impairments in the fiber optic channel and other optical impairments. The recovered signal is sent to the system end, where digital signal processing is also used to address the electrical path impairments encountered.

[0003] With the continuous increase in bandwidth and channel count of optical communication systems, this DSP-based optical interconnect method faces severe challenges. The increasing complexity of the DSP functionality required by the system leads to a significant increase in the overall system power consumption. To address this issue, a new optical interconnect method has been proposed in the field of optical communication. This method eliminates the need for a DSP chip inside the optical module by enhancing the system-side SerDes functionality. Its basic principle is to directly modulate the signal generated by the SerDes, after certain electrical channel impairments, onto the optical chip, and then transmit it through the optical fiber channel to the receiving end of the next port. The converted electrical signal at the receiving end is directly transmitted through the electrical channel to the system-side SerDes for processing.

[0004] However, the applicant discovered the following problems with the existing technology:

[0005] a. Insufficient link distortion modeling: Traditional models lack dynamic compensation mechanisms for the dispersion, attenuation, and nonlinear effects of fiber optic channels.

[0006] b. Poor module synergy: The joint simulation accuracy of electrical domain equalization [such as feed-forward equalizer (FFE) / decision-feedback equalizer (DFE)] and optical domain devices [such as Mach-Zehnder modulator (MZM) and avalanche photodiode (APD) photodetector] is insufficient.

[0007] c. Inadequate noise suppression: The cascade optimization of the receiver's automatic gain control (AGC) and continuous-time linear equalizer (CTLE) has not formed a systematic solution. Summary of the Invention

[0008] This invention provides an optical interconnect simulation method and system based on full-link parameter optimization, which solves the problem of synergistic optimization of electro-optical-electrical link distortion compensation and noise suppression in high-speed optical interconnect systems, and improves simulation accuracy to meet the verification requirements of single-wavelength transmission scenarios above 200Gbps.

[0009] According to one aspect of the present invention, a method for simulating optical interconnects based on end-to-end parameter optimization is provided, comprising:

[0010] The original signal is processed by the encoding module, the first feedforward equalizer and the continuous-time linear equalizer to obtain the electrical signal to be processed.

[0011] The electrical signal to be processed is modulated and converted into an optical signal to be transmitted through the driving circuit, and then the optical signal to be transmitted is transmitted through the optical channel.

[0012] The optical signal to be transmitted is obtained by sensing the optical signal to be transmitted by a photodiode, and the electrical signal to be received is obtained by processing the electrical signal to be received by a transimpedance amplifier to obtain the electrical signal to be recovered.

[0013] The target received signal corresponding to the original signal is obtained by processing the electrical signal to be recovered through an automatic gain control continuous-time linear equalizer, a decision feedback equalizer, and a second feedforward equalizer.

[0014] According to another aspect of the present invention, an optical interconnect simulation system based on end-to-end parameter optimization is provided, comprising:

[0015] The signal processing module includes an encoding module, a first feedforward equalizer, and a continuous-time linear equalizer, used to process the original signal to obtain the electrical signal to be processed.

[0016] An optical signal modulation and transmission module, including a driving circuit and an optical channel, is used to modulate and convert an electrical signal to be processed into an optical signal to be transmitted, and to transmit the optical signal to be transmitted.

[0017] The optical signal receiving and processing module includes a photodiode and a transimpedance amplifier. The photodiode is used to sense the optical signal to be transmitted to obtain the electrical signal to be received, and the transimpedance amplifier is used to process the electrical signal to be received to obtain the electrical signal to be recovered.

[0018] The signal recovery module includes an automatic gain control continuous-time linear equalizer, a decision feedback equalizer, and a second feedforward equalizer, which are used to process the electrical signal to be recovered to obtain the target received signal corresponding to the original signal.

[0019] In some embodiments, after obtaining the target received signal corresponding to the original signal, the method further includes:

[0020] Determine the comparison results between the target received signal and the original signal, and adjust the parameters of the module to be adjusted based on the comparison results;

[0021] The module to be adjusted includes at least one of the following: a first feedforward equalizer, a continuous-time linear equalizer, a driving circuit, an automatic gain control continuous-time linear equalizer, a decision feedback equalizer, and a second feedforward equalizer.

[0022] In some embodiments, the original signal is processed based on the encoding module, the first feedforward equalizer, and the continuous-time linear equalizer to obtain the electrical signal to be processed, including:

[0023] The original signal is processed by the encoding module to obtain the encoded signal;

[0024] The encoded signal is preprocessed by the first feedforward equalizer to obtain the first electrical signal;

[0025] The first electrical signal is processed by a continuous-time linear equalizer to obtain the electrical signal to be processed.

[0026] In some embodiments, the driving circuit includes a driver, a continuous wave laser, and a modulator. The driving circuit modulates the electrical signal to be processed into an optical signal to be transmitted, including:

[0027] A continuous wave laser generates a continuous optical carrier, and a driver drives a modulator to modulate the signal to be processed onto the optical carrier, thus obtaining the optical signal to be transmitted.

[0028] In some embodiments, the process of processing the received electrical signal using a transimpedance amplifier to obtain the recovered electrical signal includes:

[0029] The electrical signal to be received is converted into a voltage signal by a transimpedance amplifier, and the voltage signal is amplified to obtain the electrical signal to be recovered.

[0030] In some embodiments, the electrical signal to be recovered is processed by an automatic gain control continuous-time linear equalizer, a decision feedback equalizer, and a second feedforward equalizer to obtain the target received signal corresponding to the original signal, including:

[0031] The signal to be recovered is processed by an automatic gain control continuous-time linear equalizer, and then processed by a decision feedback equalizer and a second feedforward equalizer to obtain the target received signal.

[0032] In some embodiments, the automatic gain control (ADC) continuous-time linear equalizer performs automatic gain control and equalization processing on the electrical signal to be recovered, including:

[0033] The frequency response of the electrical signal to be recovered is compensated by a continuous-time linear equalizer, and the amplitude of the electrical signal to be recovered is adjusted by automatic gain control.

[0034] According to one aspect of the present invention, an optical interconnect simulation system based on end-to-end parameter optimization is provided, comprising:

[0035] The signal processing module includes an encoding module, a first feedforward equalizer, and a continuous-time linear equalizer, used to process the original signal to obtain the electrical signal to be processed.

[0036] An optical signal modulation and transmission module, including a driving circuit and an optical channel, is used to modulate and convert an electrical signal to be processed into an optical signal to be transmitted, and to transmit the optical signal to be transmitted.

[0037] The optical signal receiving and processing module includes a photodiode and a transimpedance amplifier. The photodiode is used to sense the optical signal to be transmitted to obtain the electrical signal to be received, and the transimpedance amplifier is used to process the electrical signal to be received to obtain the electrical signal to be recovered.

[0038] The signal recovery module includes an automatic gain control continuous-time linear equalizer, a decision feedback equalizer, and a second feedforward equalizer, which are used to process the electrical signal to be recovered to obtain the target received signal corresponding to the original signal.

[0039] In some embodiments, it also includes:

[0040] The parameter adjustment module is used to determine the comparison result between the target received signal and the original signal after obtaining the target received signal corresponding to the original signal, and adjust the parameters of the module to be adjusted based on the comparison result;

[0041] The module to be adjusted includes at least one of the following: a first feedforward equalizer, a continuous-time linear equalizer, a driving circuit, an automatic gain control continuous-time linear equalizer, a decision feedback equalizer, and a second feedforward equalizer.

[0042] In some embodiments, the signal processing module is specifically used for:

[0043] The original signal is processed by the encoding module to obtain the encoded signal;

[0044] The encoded signal is preprocessed by the first feedforward equalizer to obtain the first electrical signal;

[0045] The first electrical signal is processed by a continuous-time linear equalizer to obtain the electrical signal to be processed.

[0046] In some embodiments, it also includes:

[0047] The parameter adjustment module is used to determine the comparison result between the target received signal and the original signal after obtaining the target received signal corresponding to the original signal, and adjust the parameters of the module to be adjusted based on the comparison result;

[0048] The module to be adjusted includes at least one of the following: a first feedforward equalizer, a continuous-time linear equalizer, a driving circuit, an automatic gain control continuous-time linear equalizer, a decision feedback equalizer, and a second feedforward equalizer.

[0049] In some embodiments, the signal processing module is specifically used for:

[0050] The original signal is processed by the encoding module to obtain the encoded signal;

[0051] The encoded signal is preprocessed by the first feedforward equalizer to obtain the first electrical signal;

[0052] The first electrical signal is processed by a continuous-time linear equalizer to obtain the electrical signal to be processed.

[0053] In some embodiments, the driving circuit includes a driver, a continuous wave laser, and a modulator;

[0054] Continuous wave lasers are used to generate continuous optical carrier waves;

[0055] The driver is used to drive the modulator to modulate the signal to be processed onto the optical carrier, so as to obtain the optical signal to be transmitted.

[0056] In some embodiments, a transimpedance amplifier is used to convert the electrical signal to be received into a voltage signal and amplify the voltage signal to obtain the electrical signal to be recovered.

[0057] In some embodiments, an automatic gain control continuous-time linear equalizer is used to perform automatic gain control and equalization processing on the electrical signal to be recovered.

[0058] The decision feedback equalizer and the second feedforward equalizer are used to process the electrical signal to be recovered to obtain the target received signal.

[0059] In some embodiments, the continuous-time linear equalizer is specifically used to compensate for the frequency response of the electrical signal to be recovered.

[0060] Automatic gain control is specifically used to adjust the amplitude of the electrical signal to be recovered.

[0061] The technical solution of this invention processes the original signal through an encoding module, a first feedforward equalizer, and a continuous-time linear equalizer to obtain a signal to be processed; the signal to be processed is modulated and converted into a signal to be transmitted through a driving circuit, and then transmitted through an optical channel; a signal to be received is obtained by sensing the signal to be transmitted through a photodiode, and then processed by a transimpedance amplifier to obtain a signal to be recovered; the recovered signal is processed by an automatic gain control continuous-time linear equalizer, a decision feedback equalizer, and a second feedforward equalizer to obtain the target received signal corresponding to the original signal. This solves the problem of synergistic optimization of distortion compensation and noise suppression in electro-optical-electrical links in high-speed optical interconnect systems, improving simulation accuracy to meet the verification requirements of transmission scenarios exceeding 200Gbps (data rate of 200 gigabits per second).

[0062] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0063] 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.

[0064] Figure 1 A flowchart of an optical interconnect simulation method based on end-to-end parameter optimization provided in an embodiment of the present invention;

[0065] Figure 2 A schematic diagram of the structure of an optical interconnect simulation system based on end-link parameter optimization provided in an embodiment of the present invention;

[0066] Figure 3 This is a schematic diagram of another optical interconnect simulation system based on full-link parameter optimization provided in an embodiment of the present invention. Detailed Implementation

[0067] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0068] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0069] To further clarify the technical effects of the embodiments of the present invention, the defects of the prior art and the beneficial effects of the present invention are explained:

[0070] Insufficient modeling of link distortion: Traditional models, when describing the characteristics of fiber optic channels, lack dynamic compensation mechanisms for dispersion (signal broadening caused by different frequency components of light propagating at different speeds in the fiber), attenuation (the power of the optical signal gradually decreases as it propagates in the fiber), and nonlinear effects (when the light intensity is high, the refractive index and other properties of the fiber are no longer linearly related to the light intensity, leading to signal distortion). When these distortions change with time, environment, and other factors, traditional models cannot adjust and compensate in a timely manner, seriously affecting the signal transmission quality.

[0071] Poor module synergy: Optical communication systems consist of electrical equalization modules (such as feedforward equalizers (FFE) and decision feedback equalizers (DFE)) and optical devices (such as Mach-Zehnder modulators (MZM) and avalanche photodiodes (APDs). During system simulation, the accuracy of joint simulation of electrical equalization modules and optical devices is insufficient, making it difficult to accurately simulate their mutual influence and synergistic effects in actual operation. This results in deviations between the designed system performance and expectations.

[0072] Inadequate noise suppression: In optical communication receivers, automatic gain control (AGC) is used to automatically adjust the signal gain to maintain stable output signal amplitude, while continuous-time linear equalizer (CTLE) is used to perform linear equalization to improve signal quality. However, currently, there is no systematic solution for cascading optimization of AGC and CTLE, which fails to fully leverage their synergistic effect in noise suppression and signal quality improvement.

[0073] To address the shortcomings of link distortion modeling, the optical interconnect simulation system based on full-link parameter optimization proposed in this invention can comprehensively model and analyze the entire link. It not only considers the static characteristics of the optical fiber channel but also introduces a dynamic compensation mechanism. By monitoring changes in parameters such as dispersion, attenuation, and nonlinear effects in the link in real time, it uses advanced algorithms and models to dynamically adjust and compensate for these distortions, effectively solving the problem that traditional models cannot cope with dynamic changes in link distortion and improving signal transmission quality.

[0074] To address the issue of poor module interoperability, an optical interconnect simulation system based on end-to-end parameter optimization provides a unified simulation platform for electrical equalization modules and optical devices. On this platform, the interactions between electrical and optical modules can be accurately simulated, fully considering their mutual influence in actual operation. By optimizing simulation algorithms and parameter settings, the accuracy of co-simulation can be improved, system performance can be predicted more accurately, and more reliable guidance can be provided for system design, effectively solving the problem of poor module interoperability.

[0075] To address the issue of inadequate noise suppression, this invention employs a dynamic link compensation mechanism that cascades and optimizes AGC and CTLE. Through in-depth analysis and modeling of the noise characteristics throughout the link, combined with a dynamic compensation algorithm, the parameters of AGC and CTLE can be adjusted in real-time according to the actual noise conditions, forming a systematic noise suppression scheme. This fully leverages the synergistic effect of AGC and CTLE in noise suppression, effectively improving signal quality and achieving consistent performance across the entire system.

[0076] Figure 1 This is a flowchart illustrating an optical interconnect simulation method based on end-link parameter optimization, provided as an embodiment of the present invention. This embodiment is applicable to optical communication simulation and can be executed by an optical interconnect simulation system, which can be implemented in hardware and / or software. Figure 1 As shown, the method specifically includes the following steps:

[0077] S110. The original signal is processed based on the encoding module, the first feedforward equalizer, and the continuous-time linear equalizer to obtain the electrical signal to be processed.

[0078] The electrical signal to be processed can refer to the electrical signal obtained after processing the original signal. The encoding module can be a 4-level Pulse Amplitude Modulation (PAM4) encoding module, which has 16 / 32 level configurability and can generate multi-level signals. The first feedforward equalizer can adaptively adjust the tap coefficients of the feedforward equalizer (FFE) based on the channel's frequency response. The feedforward equalizer can be optimized using the Least Mean Square (LMS) algorithm. The LMS algorithm continuously adjusts the equalizer parameters based on the error between the input signal and the desired signal, thereby effectively compensating for signal distortion in the transmission channel.

[0079] In some embodiments, the original signal is processed based on the encoding module, the first feedforward equalizer, and the continuous-time linear equalizer to obtain the electrical signal to be processed, including: processing the original signal through the encoding module to obtain an encoded signal; preprocessing the encoded signal through the first feedforward equalizer to obtain a first electrical signal; and processing the first electrical signal through the continuous-time linear equalizer to obtain the electrical signal to be processed.

[0080] Specifically, the input raw signal is first subjected to pulse amplitude modulation encoding, converting the raw data into an encoding format suitable for transmission. Next, the signal is preprocessed by a first feedforward equalizer to compensate for potential signal distortion from subsequent electrical channels. Finally, the digital signal is converted back to an analog signal by the analog output module (AnalogOut) to obtain the signal to be processed.

[0081] S120: The electrical signal to be processed is modulated and converted into an optical signal to be transmitted through the driving circuit, and the optical signal to be transmitted is transmitted through the optical channel.

[0082] In this embodiment of the invention, the driving circuit integrates the IBIS-AMI interface. By integrating this interface, the driving circuit model can simulate the nonlinear load characteristics of the optical emitting device and more accurately reflect the actual circuit operation.

[0083] In some embodiments, the driving circuit includes a driver, a continuous wave laser, and a modulator. The driving circuit modulates the electrical signal to be processed into an optical signal to be transmitted. This can include generating a continuous optical carrier wave through the continuous wave laser and driving the modulator through the driver to modulate the signal to be processed onto the optical carrier wave to obtain the optical signal to be transmitted.

[0084] Specifically, a continuous wave laser (CW Laser) generates a continuous optical carrier. A Mach-Zehnder modulator, under the control of a driver, modulates the analog electrical signal transmitted through the electrical channel onto the optical carrier, forming an optical signal, which serves as the signal to be transmitted. This optical signal is then transmitted through a fiber optic channel, and during transmission, it may be affected by various factors, such as fiber loss and dispersion. S130: The optical signal to be transmitted is sensed by a photodiode to obtain the electrical signal to be received, and the received electrical signal is processed by a transimpedance amplifier to obtain the electrical signal to be recovered.

[0085] In some preferred embodiments, the process of processing the received electrical signal to obtain the recovered electrical signal by using a transimpedance amplifier may include: converting the received electrical signal into a voltage signal by using a transimpedance amplifier, and amplifying the voltage signal to obtain the recovered electrical signal.

[0086] Specifically, a photodiode or avalanche photodiode (PD / APD) converts the received optical signal into an electrical signal. A transimpedance amplifier converts the weak current signal output by the photodetector into a voltage signal and amplifies it initially as the electrical signal to be recovered.

[0087] In this embodiment of the invention, the optical fiber transmission model employs a piecewise Raman gain calculation and a nonlinear Schrödinger equation (NLSE) compensation algorithm. During optical fiber transmission, the signal is affected by various factors, such as fiber loss, dispersion, and nonlinear effects. Piecewise Raman gain calculation can more accurately simulate the Raman amplification process in the optical fiber, while the NLSE compensation algorithm is used to compensate for nonlinear effects in the optical fiber, thereby improving the accuracy of the optical fiber transmission model.

[0088] S140. The electrical signal to be recovered is processed by an automatic gain control continuous-time linear equalizer, a decision feedback equalizer, and a second feedforward equalizer to obtain the target received signal corresponding to the original signal.

[0089] In some embodiments, the target received signal corresponding to the original signal is obtained by processing the electrical signal to be recovered through an automatic gain control continuous-time linear equalizer, a decision feedback equalizer, and a second feedforward equalizer. This includes: performing automatic gain control and equalization processing on the electrical signal to be recovered through an automatic gain control continuous-time linear equalizer, and then processing the electrical signal to be recovered through a decision feedback equalizer and a second feedforward equalizer to obtain the target received signal.

[0090] The amplified analog electrical signal (i.e., the signal to be recovered) can be received via an analog input module. An automatic gain control-continuous time linear equalizer (AGC-CTLE) performs automatic gain control and equalization to compensate for signal attenuation and distortion during transmission. Finally, a decision feedback equalizer / clock data recovery / feedforward equalizer (DFE / CDR / FFE) further processes the signal to recover the original digital signal, which serves as the target received signal. The entire process, through an electro-optical-electro-electronic conversion, enables long-distance transmission and accurate recovery of the digital signal in optical fiber.

[0091] In other embodiments, the automatic gain control (AGDC) continuous-time linear equalizer is used to perform automatic gain control and equalization processing on the electrical signal to be recovered, including: compensating the frequency response of the electrical signal to be recovered using the AGDC, and adjusting the amplitude of the electrical signal to be recovered using automatic gain control.

[0092] In this embodiment of the invention, a CTLE-AGC joint feedback loop is employed. The continuous-time linear equalizer compensates for the signal's frequency response, while automatic gain control adjusts the signal's amplitude. The joint feedback loop simultaneously achieves synchronous calibration of amplitude and frequency response, effectively suppressing noise in the signal and improving signal quality.

[0093] In an optional embodiment, the DFE is cascaded with the Maximum Likelihood Sequence Detection (MLSD) algorithm. The DFE can perform post-equalization on the signal to further eliminate inter-symbol interference; the MLSD algorithm improves the accuracy of signal detection by finding the most likely transmission sequence. The cascading of the two can reduce the bit error rate to below 1E-15, greatly improving the reliability of the communication system.

[0094] In some preferred embodiments, after obtaining the target received signal corresponding to the original signal, the method further includes: determining the comparison result between the target received signal and the original signal, and adjusting the parameters of the module to be adjusted based on the comparison result.

[0095] The module to be adjusted includes at least one of the following: a first feedforward equalizer, a continuous-time linear equalizer, a driving circuit, an automatic gain control continuous-time linear equalizer, a decision feedback equalizer, and a second feedforward equalizer.

[0096] After obtaining the target received signal corresponding to the original signal, the target received signal and the original signal can be compared. Based on the differences obtained from the comparison, the parameters of the module to be adjusted are optimized. The module to be adjusted includes at least one of the following: a first feedforward equalizer, a continuous-time linear equalizer, a drive circuit, an automatic gain control continuous-time linear equalizer, a decision feedback equalizer, and a second feedforward equalizer. The aim is to improve signal processing performance and system performance.

[0097] The technical solutions of the embodiments of the present invention include at least the following technical effects:

[0098] a. Compared to traditional solutions, this system architecture improves simulation accuracy by 30%. When designing and verifying optical communication systems, it can more accurately simulate the operation of actual systems, reducing the discrepancy between the design and the actual product. Simultaneously, it supports the design of 400G / 800G optical modules and the verification of silicon photonics chips. 400G and 800G are current high-speed transmission standards in the optical communication field, and this architecture can meet the R&D needs of high-speed optical communication products.

[0099] b. This system architecture is scalable and can be applied to emerging architectures such as CPO (co-packaged optics) and LPO (linearly driven pluggable optics). CPO and LPO are emerging technology architectures in the field of optical communication, with advantages such as higher integration and lower power consumption. The scalability of this architecture enables it to adapt to the ever-evolving trends of optical communication technology.

[0100] The technical solution of this invention processes the original signal through an encoding module, a first feedforward equalizer, and a continuous-time linear equalizer to obtain a signal to be processed; the signal to be processed is modulated and converted into a signal to be transmitted through a driving circuit, and then transmitted through an optical channel; a signal to be received is obtained by sensing the signal to be transmitted through a photodiode, and then processed by a transimpedance amplifier to obtain a signal to be recovered; the recovered signal is processed by an automatic gain control continuous-time linear equalizer, a decision feedback equalizer, and a second feedforward equalizer to obtain the target received signal corresponding to the original signal. This solves the problem of synergistic optimization of distortion compensation and noise suppression in electro-optical-electrical links in high-speed optical interconnect systems, improving simulation accuracy to meet the verification requirements of transmission scenarios exceeding 200Gbps (data rate of 200 gigabits per second).

[0101] Figure 2 This is a schematic diagram of a simulation system for optical interconnection based on end-to-end parameter optimization, provided as an embodiment of the present invention. Figure 2 As shown, the system includes:

[0102] i. Sender:

[0103] a) PAM4 encoding module: supports 16 / 32 level configurability to generate multi-level signals;

[0104] b) Dynamic pre-equalizer: Adaptively adjusts the FFE tap coefficients based on the channel frequency response (optimized using the LMS algorithm);

[0105] c) Driving circuit model: Integrates IBIS-AMI interface to simulate the nonlinear load characteristics of optical emitting devices.

[0106] ii. Optical Domain Links:

[0107] a) MZM modulator model: supports real-time collaborative optimization of bias voltage and modulation depth, and embeds VPI transmission equation;

[0108] b) Fiber optic transmission model: A segmented Raman gain calculation and nonlinear Schrödinger equation (NLSE) compensation algorithm are adopted.

[0109] iii. Receiver:

[0110] a) Noise suppression system: CTLE-AGC joint feedback loop to achieve synchronous calibration of amplitude and frequency response;

[0111] b) Digital Equalization Module: The DFE is cascaded with the Maximum Likelihood Sequence Detection (MLSD) algorithm, reducing the bit error rate to below 1E-15.

[0112] Figure 3 This is a schematic diagram of another optical interconnect simulation system based on end-to-end parameter optimization provided in an embodiment of the present invention. Figure 3 As shown, the system includes:

[0113] The signal processing module 310 includes an encoding module, a first feedforward equalizer, and a continuous-time linear equalizer, used to process the original signal to obtain the electrical signal to be processed.

[0114] The optical signal modulation and transmission module 320 includes a driving circuit and an optical channel, used to modulate and convert the electrical signal to be processed into an optical signal to be transmitted, and to transmit the optical signal to be transmitted;

[0115] The optical signal receiving and processing module 330 includes a photodiode and a transimpedance amplifier. The photodiode is used to sense the optical signal to be transmitted to obtain the electrical signal to be received, and the transimpedance amplifier is used to process the electrical signal to be received to obtain the electrical signal to be recovered.

[0116] The signal recovery module 340 includes an automatic gain control continuous-time linear equalizer, a decision feedback equalizer, and a second feedforward equalizer, which are used to process the electrical signal to be recovered to obtain the target received signal corresponding to the original signal.

[0117] In some embodiments, it also includes:

[0118] The parameter adjustment module is used to determine the comparison result between the target received signal and the original signal after obtaining the target received signal corresponding to the original signal, and adjust the parameters of the module to be adjusted based on the comparison result;

[0119] The module to be adjusted includes at least one of the following: a first feedforward equalizer, a continuous-time linear equalizer, a driving circuit, an automatic gain control continuous-time linear equalizer, a decision feedback equalizer, and a second feedforward equalizer.

[0120] In some embodiments, the signal processing module is specifically used for:

[0121] The original signal is processed by the encoding module to obtain the encoded signal;

[0122] The encoded signal is preprocessed by the first feedforward equalizer to obtain the first electrical signal;

[0123] The first electrical signal is processed by a continuous-time linear equalizer to obtain the electrical signal to be processed.

[0124] In some embodiments, the driving circuit includes a driver, a continuous wave laser, and a modulator;

[0125] Continuous wave lasers are used to generate continuous optical carrier waves;

[0126] The driver is used to drive the modulator to modulate the signal to be processed onto the optical carrier, so as to obtain the optical signal to be transmitted.

[0127] In some embodiments, a transimpedance amplifier is used to convert the electrical signal to be received into a voltage signal and amplify the voltage signal to obtain the electrical signal to be recovered.

[0128] In some embodiments, an automatic gain control continuous-time linear equalizer is used to perform automatic gain control and equalization processing on the electrical signal to be recovered.

[0129] The decision feedback equalizer and the second feedforward equalizer are used to process the electrical signal to be recovered to obtain the target received signal.

[0130] In some embodiments, the continuous-time linear equalizer is specifically used to compensate for the frequency response of the electrical signal to be recovered.

[0131] Automatic gain control is specifically used to adjust the amplitude of the electrical signal to be recovered.

[0132] The optical interconnect simulation system based on full-link parameter optimization provided in this embodiment of the invention can execute the optical interconnect simulation method based on full-link parameter optimization provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0133] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An optical interconnection simulation method based on full-link parameter optimization, characterized in that, The method comprises the following steps: processing the original signal based on an encoding module, a first feedforward equalizer and a continuous-time linear equalizer to obtain an electric signal to be processed; modulating and converting the electric signal to be processed into an optical signal to be sent through a driving circuit, and sending the optical signal to be sent through an optical channel; obtaining an electric signal to be received by means of a photodiode in response to the optical signal to be sent, and processing the electric signal to be received through a transimpedance amplifier to obtain an electric signal to be recovered; processing the electric signal to be recovered through an automatic gain control continuous-time linear equalizer, a decision feedback equalizer and a second feedforward equalizer to obtain a target received signal corresponding to the original signal; the driving circuit comprises a driver, a continuous wave laser and a modulator, and the modulating and converting of the electric signal to be processed into the optical signal to be sent through the driving circuit comprises the following steps: generating a continuous optical carrier by means of the continuous wave laser, and driving the modulator by means of the driver to modulate the electric signal to be processed into the optical carrier to obtain the optical signal to be sent.

2. The method of claim 1, wherein, After obtaining the target received signal corresponding to the original signal, the method further comprises the following steps: determining a comparison result of the target received signal and the original signal, and adjusting parameters of an adjustable module based on the comparison result; wherein the adjustable module comprises at least one of the first feedforward equalizer, the continuous-time linear equalizer, the driving circuit, the automatic gain control continuous-time linear equalizer, the decision feedback equalizer and the second feedforward equalizer.

3. The method of claim 1, wherein, The processing of the original signal based on the encoding module, the first feedforward equalizer and the continuous-time linear equalizer to obtain the electric signal to be processed comprises the following steps: processing the original signal through the encoding module to obtain an encoded signal; preprocessing the encoded signal through the first feedforward equalizer to obtain a first electric signal; processing the first electric signal through the continuous-time linear equalizer to obtain the electric signal to be processed.

4. The method of claim 1, wherein, The processing of the electric signal to be received through the transimpedance amplifier to obtain the electric signal to be recovered comprises the following steps: converting the electric signal to be received into a voltage signal through the transimpedance amplifier, and amplifying the voltage signal to obtain the electric signal to be recovered.

5. The method of claim 1, wherein, The processing of the electric signal to be recovered through the automatic gain control continuous-time linear equalizer, the decision feedback equalizer and the second feedforward equalizer to obtain the target received signal corresponding to the original signal comprises the following steps: performing automatic gain control and equalization processing on the electric signal to be recovered through the automatic gain control continuous-time linear equalizer, and then processing the electric signal to be recovered through the decision feedback equalizer and the second feedforward equalizer to obtain the target received signal.

6. The method of claim 5, wherein, The automatic gain control and equalization processing on the electric signal to be recovered through the automatic gain control continuous-time linear equalizer comprises the following steps: compensating the frequency response of the electric signal to be recovered through the continuous-time linear equalizer, and adjusting the amplitude of the electric signal to be recovered through the automatic gain control.

7. An all-link parameter optimization based optical interconnection simulation system, characterized in that, The method comprises the following steps: a signal processing module comprising an encoding module, a first feedforward equalizer and a continuous-time linear equalizer, for processing an original signal to obtain an electric signal to be processed; The optical signal modulation and sending module comprises a driving circuit and an optical channel, and is configured to modulate and convert the to-be-processed electrical signal into a to-be-sent optical signal, and send the to-be-sent optical signal. The optical signal receiving and processing module comprises a photodiode and a transimpedance amplifier, the photodiode is configured to induct the to-be-sent optical signal to obtain a to-be-received electrical signal, and the transimpedance amplifier is configured to process the to-be-received electrical signal to obtain a to-be-recovered electrical signal. The signal recovery module comprises an automatic gain control continuous time linear equalizer, a decision feedback equalizer and a second feedforward equalizer, and is configured to process the to-be-recovered electrical signal to obtain a target received signal corresponding to the original signal. The driving circuit comprises a driver, a continuous wave laser and a modulator. The continuous wave laser is configured to generate a continuous optical carrier. The driver is configured to drive the modulator to modulate the to-be-processed electrical signal to the optical carrier to obtain the to-be-sent optical signal.

8. The system of claim 7, wherein, Further comprising: A parameter adjustment module is configured to determine a comparison result of the target received signal and the original signal after obtaining the target received signal corresponding to the original signal, and adjust parameters of a to-be-adjusted module based on the comparison result. The to-be-adjusted module comprises at least one of a first feedforward equalizer, a continuous time linear equalizer, a driving circuit, an automatic gain control continuous time linear equalizer, a decision feedback equalizer and a second feedforward equalizer.

9. The system of claim 7, wherein, The signal processing module is specifically configured to: Process the original signal through the encoding module to obtain an encoded signal; Preprocess the encoded signal through the first feedforward equalizer to obtain a first electrical signal; Process the first electrical signal through the continuous time linear equalizer to obtain the to-be-processed electrical signal.

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