CN116346215A

CN116346215A - Signal processing method and signal processing system

Info

Publication number: CN116346215A
Application number: CN202211313422.5A
Authority: CN
Inventors: 周谞; 王娟; 刘小军; 蒋浩; 高峰; 程钢
Original assignee: Beijing Baidu Netcom Science and Technology Co Ltd
Current assignee: Beijing Baidu Netcom Science and Technology Co Ltd
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2023-06-27
Also published as: CN113098592B; CN115694620A; CN113098592A; CN115694621A; CN116318378A

Abstract

The disclosure provides a signal processing method and a signal processing system, and relates to the fields of optical communication, information flow, signal processing, data transmission, big data and cloud computing. The specific implementation scheme is as follows: determining a target route of a current transmission signal according to the switching condition of the routes; and carrying out signal recovery processing on the signal received from the target route based on the pre-stored parameters determined before the route switching. According to the technology disclosed by the invention, the speed of route switching and digital signal processing is improved, and the data loss is reduced.

Description

Signal processing method and signal processing system

The present application is a divisional application of chinese patent application with application date 2021, 03, 31, application number 202110350734.2 and the name "signal processing method and signal processing system".

Technical Field

The present disclosure relates to the field of data processing technologies, and in particular, to the fields of optical communications, information flow, signal processing, data transmission, big data, and cloud computing.

Background

In an optical transmission network, when detecting that the optical power of a signal transmitted by a route falls, a route switching is required to protect the optical transmission network from continuing data transmission. However, since the time of the route switching and the time of the signal recovery process are long, a large amount of data loss is caused to the data transmitted in the optical transmission network.

Disclosure of Invention

The present disclosure provides a signal processing method and a signal processing system.

According to an aspect of the present disclosure, there is provided a signal processing method including:

determining a target route of a current transmission signal according to the switching condition of the routes;

and carrying out signal recovery processing on the signal received from the target route based on the pre-stored parameters determined before the route switching.

According to another aspect of the present disclosure, there is provided a signal processing apparatus including:

the determining module is used for determining a target route of the current transmission signal according to the switching condition of the routes;

and the signal recovery module is used for carrying out signal recovery processing on the signal received from the target route based on the pre-stored parameters determined before the route switching.

According to another aspect of the present disclosure, there is provided a signal processing system including:

at least two routes for transmitting signals;

the optical protection board card comprises a high-speed optical switch, a processor and a first optical power detector; the input end of the high-speed optical switch is connected with the route respectively, the first optical power detector is connected with the route, the processor is connected with the high-speed optical switch and the first optical power detector, and the processor is used for controlling the connection state of the high-speed optical switch and the route according to the optical power of the route detected by the first optical power detector;

The service board card comprises the signal processing device, and the signal processing device is connected with the output end of the high-speed optical switch.

According to another aspect of the present disclosure, there is provided an electronic device including:

at least one processor; and

a memory communicatively coupled to the at least one processor; wherein, the liquid crystal display device comprises a liquid crystal display device,

the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of the embodiments of the present disclosure.

According to another aspect of the present disclosure, there is provided a non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the method of any of the embodiments of the present disclosure.

According to another aspect of the present disclosure, there is provided a computer program product comprising a computer program which, when executed by a processor, implements the method in any of the embodiments of the present disclosure.

According to the technology disclosed by the invention, the speed of route switching and digital signal processing is improved, and the data loss is reduced.

It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the disclosure, nor is it intended to be used to limit the scope of the disclosure. Other features of the present disclosure will become apparent from the following specification.

Drawings

The drawings are for a better understanding of the present solution and are not to be construed as limiting the present disclosure. Wherein:

fig. 1 is a schematic flow chart of an implementation of a signal processing method according to an embodiment of the present application;

fig. 2 is a schematic flow chart of an implementation of a signal processing method according to an embodiment of the present application;

FIG. 3 is a schematic flow chart of an implementation of a signal processing method according to an embodiment of the present application;

fig. 4 is a schematic flow chart of an implementation of a signal processing method according to an embodiment of the present application;

fig. 5 is a schematic flow chart of an implementation of a signal processing method according to an embodiment of the present application;

fig. 6 is a schematic structural view of a signal processing apparatus according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a signal processing system according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a signal processing system according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a signal processing system according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of a signal processing system according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of a signal processing system according to an embodiment of the present application;

fig. 12 is a block diagram of an electronic device for implementing a signal processing method of an embodiment of the present application.

Detailed Description

Exemplary embodiments of the present disclosure are described below in conjunction with the accompanying drawings, which include various details of the embodiments of the present disclosure to facilitate understanding, and should be considered as merely exemplary. Accordingly, one of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present disclosure. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.

According to an embodiment of the present disclosure, as shown in fig. 1, the present disclosure provides a signal processing method, which is applied to a service board card, including:

s10: and determining the target route of the current transmission signal according to the switching condition of the routes.

The switching of the routes can be realized by an optical protection board card connected with the service board card, and the optical protection board card determines whether to switch the routes for signal transmission with the service board card according to the optical power drop condition of the signals transmitted in each route. The switching of the route can also be realized by artificial active intervention, namely, the artificial active switching and the routing of the service board card for signal transmission. The switching of the route can also automatically trigger the light protection board card to switch after the service board card detects that the light power of the route falls.

The service board card can be used as a terminal for signal transmission, and also can be used as a transfer station for signal transmission. After the signal sent by the light protection board card is transmitted to the service board card, the service board card can directly utilize the received signal to execute certain operations, and can also process the received signal and then send the processed signal to other terminals. The specific product corresponding to the service board is not specifically limited herein, and any device that can process signals can be understood as the service board. For example, the service card may be a mobile terminal, server, cloud, computer, etc.

The current target route of the transmission signal can be understood as the route of the signal transmission with the service board card after route switching. For example, routes for transmitting the same signal include a main route and a standby route, both routes can send signals to a board for controlling route switching (i.e. signal double sending), and the board for controlling route switching can only select one route to send signals to a service board (i.e. signal selecting and receiving). Therefore, the service board card needs to determine which route the currently received signal is sent, so that the signal recovery processing can be performed on the route in a targeted manner based on the characteristics of the route, and the optical transmission network can continue to smoothly and stably perform data transmission.

S11: and carrying out signal recovery processing on the signal received from the target route based on the pre-stored parameters determined before the route switching.

The pre-stored parameters are used to speed up the signal recovery process. By pre-storing parameters, the service board card can quickly realize the recovery processing of signals sent by the target route based on the characteristics of the target route and the characteristics of the board card for signal transmission with the target route.

The pre-stored parameters can be understood as parameters related to signal transmission, which are acquired and recorded when the target route and the service board carry out signal transmission. That is, the pre-stored parameters are parameters related to signal transmission, which are acquired and recorded when the target route and the service board carry out signal transmission in a preset time. The preset time can be any time period when the target route and the service board card perform signal transmission. For example, signal transmission is started from the target route and the service board to signal transmission is ended. As another example, the target route and the traffic board signal transmission are over a certain period of time. The pre-stored parameters may characterize the characteristics of the target route transmission signal, the characteristics of the service board receiving the signal and performing signal processing, the characteristics of the board sending the signal to the target route (e.g., the service board sending the signal to the target route), etc.

For a specific procedure of the signal recovery processing, reference may be made to a signal processing manner in the prior art. Such as dispersion compensation, frequency offset compensation, clock recovery, frame synchronization, polarization demultiplexing, clock tracking, etc. The pre-stored parameters are understood to be parameters that need to be utilized during any of the above-described signal processing procedures. By directly calling pre-stored parameters, the needed parameters do not need to be recalculated when any signal processing process is executed, so that the time of signal processing is saved, and the accuracy of signal processing can be improved by referring to historical parameters.

The techniques of this disclosure may be applied to cloud computing technology, particularly data center interconnection optical transport networks. According to the technology disclosed by the invention, the speed of route switching and digital signal processing is improved, the data loss is reduced, and the stability of the optical transmission network is improved.

It should be noted that, in the conventional digital signal processing flow, a parameter scanning method is generally adopted, and each time, the method needs to perform independent calculation and processing on each module for performing signal processing in the service board card again, which results in long time for the whole signal processing. In general, the method of parameter scanning processes digital signals in between 10ms and 30 ms. Although the method of parameter scanning takes time in compliance with the ITU (International Telecommunication Union, international telecommunications union) standard for 50ms (milliseconds) of a telecommunications optical transmission system, as the data transmission rate increases, a huge amount of data loss may be caused even if the requirement of 50ms is satisfied. For example, as optical transmission systems evolve from 10Gb/s to 100Gb/s and 200Gb/s, and even 400Gb/s and 600Gb/s optical transmission wavelength division systems in the near future, the amount of data loss due to single jitter has been increased from 512M (10 Gb/s. Times.50 ms) to huge amounts of data loss of 20G and 30G. Compared with the traditional digital signal processing flow, the technology disclosed by the invention can remarkably reduce the data loss due to the fact that the time of signal recovery processing is prolonged.

In one example, determining the target route of the current transmission signal according to the switching condition of the routes can be understood as: and determining the target route of the current transmission signal under the condition that the route switching is completed.

In the route switching process, a short interruption occurs to the service board card, the interruption of the service board card can be recovered after the route switching is completed, and the service board card determines the target route of the current transmission signal according to the signal received after recovery (the signal is transmitted to the board card for controlling the route switching by the board card for controlling the route switching and is transmitted to the service board card by the board card for controlling the route switching). The board card for controlling the route switching can be a light protection board card.

In one example, determining the target route of the current transmission signal according to the switching condition of the routes can be understood as: in the process of route switching, the target route of the current transmission signal is determined. Since the route connected before the service board is determined before the route is switched, it can be directly determined which other route (i.e., the target route) needs to be switched to when the route is switched.

In one embodiment, the signal processing method includes steps S10 and S11, wherein step S11: performing signal recovery processing on the signal received from the target route based on the pre-stored parameters determined before the route switching may further include:

S111: and carrying out at least one signal recovery processing mode of dispersion compensation, frequency offset compensation, clock recovery, frame synchronization, polarization demultiplexing and phase compensation on the signal received from the target route based on the pre-stored parameters determined before route switching.

The pre-stored parameters are understood to be parameters that need to be utilized during any of the above-described signal processing procedures. By directly calling pre-stored parameters, the needed parameters do not need to be recalculated when any signal processing process is executed, so that the time of signal processing is saved, and the accuracy of signal processing can be improved by referring to historical parameters.

It should be noted that, the signal processing manner of the specific required application may be added or subtracted as needed. That is, the various signal processing procedures mentioned in step S111 are not necessarily all required, and pruning may be performed on the basis of this. The signal recovery processing can also be increased on the basis of the signal recovery processing.

In one embodiment, as shown in fig. 2, the signal processing method includes steps S10 and S11, and the pre-stored parameters include a pre-stored dispersion compensation amount. Wherein, step S111: based on the pre-stored parameters determined before the route switching, at least one signal recovery processing mode of dispersion compensation, frequency offset compensation, clock recovery, frame synchronization, polarization demultiplexing and phase compensation is performed on the signal received from the target route, and the method may further include:

S20: and determining a pre-stored dispersion compensation quantity corresponding to the target route, wherein the pre-stored dispersion compensation quantity is determined according to each historical dispersion compensation quantity of the target route in a preset time period before route switching.

The preset time period can be understood as the last time period of signal transmission between the target route and the service board card before the method is executed.

Each historical dispersion compensation amount can be understood as a dispersion compensation amount of the target route change that is continuously monitored and recorded for a preset period of time.

The final determined pre-stored dispersion compensation amount may be determined based on the average, maximum, minimum of each historical dispersion compensation amount. The historical dispersion compensation amount at the last moment in the preset time period can also be used as a pre-stored dispersion compensation amount, that is, the latest dispersion compensation amount is used as the pre-stored dispersion compensation amount.

S21: and performing dispersion compensation on the signal received from the target route according to the pre-stored dispersion compensation quantity.

The specific method of dispersion compensation may refer to the dispersion compensation method in the prior art, and is not specifically limited herein.

S22: and carrying out at least one signal recovery processing mode of frequency offset compensation, clock recovery, frame synchronization, polarization demultiplexing and phase compensation on the signal received from the target route.

Specific methods of frequency offset compensation, clock recovery, frame synchronization, polarization demultiplexing, and phase compensation may be referred to in the related art, and are not specifically limited herein.

The execution sequence of dispersion compensation, frequency offset compensation, clock recovery, frame synchronization, polarization demultiplexing and phase compensation can be adjusted according to the need, and the execution sequence is not to be understood as the literal expression sequence.

In the technique of the present disclosure, by directly determining the pre-stored dispersion compensation amount obtained based on each of the history dispersion compensation amounts as the dispersion compensation amount required at the time of dispersion compensation, the time of recalculating the dispersion compensation amount of the current route can be saved, and since the pre-stored dispersion compensation amount is determined based on the history data of the current route, the accuracy and stability of signal processing can also be ensured by directly taking it as the dispersion compensation parameter at the time of dispersion compensation. The dispersion compensation amount varies with the transmission distance of the route, and since the transmission distance of the route is generally constant, the predetermined pre-stored dispersion compensation amount does not deviate greatly, and can be basically regarded as the accurate dispersion compensation amount of the current route.

In one example, the dispersion compensation module primarily digitally compensates for transmission dispersion impairments, such as chromatic dispersion and partial polarization-mode dispersion. In a coherent optical communication system, the effect of chromatic dispersion on a received signal is mainly represented by a phase offset, as shown in the following formula:

L represents the transmission distance, γ represents the nonlinear coefficient, P0 represents the emitted light power, α represents the polarization independent attenuation coefficient, and D is the dispersion constant. It can thus be seen that if a known pilot sequence signal is used, the dispersion contribution, the amount of dispersion during transmission can be calculated from the known a (z=0) and the received a (z=l)

Mainly related to the transmission distance L. When calculating the dispersion quantity->

When the dispersion compensation is performed on all received signals. If dispersion compensation is wrong, the signal will add extra phase noise, which will lead to subsequent signal processing failure.

In one example, when there are multiple routes, a pre-stored dispersion compensation amount needs to be calculated for each route. The dispersion compensation amount of each route can be confirmed by manually and actively switching the connection state of the route and the service board card. The system can also monitor continuously when the route and the service board card are in a signal transmission state, and record a new dispersion compensation amount when the dispersion compensation amount of the route changes.

In one embodiment, as shown in fig. 3, the signal processing method includes steps S10 and S11, and the pre-stored parameters include pre-stored signal frequency offset values. Wherein, step S111: based on the pre-stored parameters determined before the route switching, at least one signal recovery processing mode of dispersion compensation, frequency offset compensation, clock recovery, frame synchronization, polarization demultiplexing and phase compensation is performed on the signal received from the target route, and the method may further include:

S30: and determining a pre-stored signal frequency offset value corresponding to the target route, wherein the pre-stored signal frequency offset value is determined according to the frequency offset difference between the center wavelength of the receiving laser and the center wavelength of the transmitting laser at the transmitting end in the moment before route switching.

The time before the route switching can be understood as the last time when the service board card and the first route perform data transmission before the route switching. The first route may be understood as a route for data transmission with the service card before switching to the target route for data transmission with the service card.

An internal receiving laser may be understood as a laser for receiving signals provided inside a service card that performs the method of the present disclosure.

A transmitting end may be understood as sending a signal to a route such that the route sends the signal to a certain board of the service boards. A transmitting laser is understood to mean a laser which is arranged inside the transmitting end and is used for transmitting signals. The transmitting end may be another service board card having the same structure as the service board card. The two service cards are located in different physical locations.

S31: and carrying out frequency offset compensation on the signal received from the target route according to the pre-stored signal frequency offset value.

The specific method of frequency offset compensation may refer to the frequency offset compensation method in the prior art, and is not specifically limited herein.

S32: and performing at least one signal recovery processing mode of dispersion compensation, clock recovery, frame synchronization, polarization demultiplexing and phase compensation on the signal received from the target route.

Specific methods of dispersion compensation, clock recovery, frame synchronization, polarization demultiplexing, and phase compensation are referred to in the art and are not specifically limited herein.

In the technology disclosed by the disclosure, the time for recalculating the frequency offset between the transmitting laser and the receiving laser can be saved by directly determining the frequency offset value of the pre-stored signal as the parameter required in the frequency offset compensation. And because the pre-stored signal frequency offset value is determined based on the frequency offset between the transmitting laser and the receiving laser at the historical moment, the pre-stored signal frequency offset value can be directly used as the frequency offset value in the frequency offset compensation process, and the accuracy and the stability of signal processing can be ensured.

In one example, the following formula is shown:

x _in [k]＝x _sym [k]exp(j[φ[k]+2πΔfkT _sym ])

wherein x is _im [k]Representing the input digital signal received at the kth time, x _sym [k]Representing the original transmission signal corresponding to the kth time, T _sym Representing the signal sampling period interval.

Carrier recovery of a received digital signal mainly requires compensation of phase noise in two parts, namely, frequency offset Δf between the center wavelength of the transmitting laser and the center wavelength of the receiving laser, and phase difference between the transmitting optical signal carrier and the receiving optical signal carrier

Wherein the frequency offset estimation is used to cancel a significant amount of phase noise, thereby allowing the efficiency of phase compensation to be improved. Taking the QPSK pattern as an example, the frequency offset estimation formula is as follows:

finding by means of feed-forward

Peaks in the frequency spectrum. Arg is the angle of the complex plane, max is the maximum value, the frequency offset deltaf represents the frequency offset between the center wavelength of the transmitting laser and the center wavelength of the receiving laser, and Tsym represents the signal sampling period interval.

In one example, the speed of light transmission in the optical fiber route is 3 x 10 x 8m/s, and even in an extreme case, when the distances between the main route and the standby route differ by 80km, the time difference between the light signals sent by the light protection system to the two routes and reaching the receiving end (service board card or light protection board card) also differs by only 0.4ms. Considering the stability of the laser, the laser itself drifts in frequency in the order of MHz in a time of 0.4ms. Thus, the method is applicable to a variety of applications. When the service is normal, the frequency offset value of the transceiver laser is continuously recorded and refreshed through the service board card which needs to process the digital signal, and when the service is interrupted and restored, the frequency offset compensation is performed by using the refreshed recorded frequency offset value.

The frequency offset compensation may include coarse estimation frequency offset compensation and fine estimation frequency offset compensation, wherein the coarse estimation frequency offset compensation is performed according to steps S30 and S31, the fine estimation frequency offset compensation maintains a dynamically balanced working mode, and the dynamic frequency offset estimation is performed on the signal, that is, the fine estimation frequency offset compensation performs further dynamic compensation based on the result of the coarse estimation frequency offset compensation.

In one embodiment, as shown in fig. 4, the signal processing method includes steps S10 and S11, and the pre-stored parameters include pre-stored clock frequency offset values. Wherein, step S111: based on the pre-stored parameters determined before the route switching, at least one signal recovery processing mode of dispersion compensation, frequency offset compensation, clock recovery, frame synchronization, polarization demultiplexing and phase compensation is performed on the signal received from the target route, and the method comprises the following steps:

s40: and determining a pre-stored clock frequency offset value corresponding to the target route, wherein the pre-stored clock frequency offset value is determined according to the internal clock sampling frequency and the signal clock frequency of the signal sent by the sending end in a preset time period before route switching.

The internal clock sampling frequency may be understood as the sampling frequency of an internally set clock of a service card performing the disclosed method.

A transmitting end may be understood as sending a signal to a route such that the route sends the signal to a certain board of the service boards. The signal clock frequency of the emitted signal is understood to be the signal clock frequency of the emitted signal itself.

S41: and recovering the current internal clock sampling frequency according to the pre-stored clock frequency offset value.

The specific method for recovering the internal clock sampling frequency may refer to the internal clock sampling frequency recovering method in the prior art, and is not specifically limited herein.

S42: and performing at least one signal recovery processing mode of dispersion compensation, frequency offset compensation, frame synchronization, polarization demultiplexing and phase compensation on the signal received from the target route.

Specific methods of dispersion compensation, frequency offset compensation, frame synchronization, polarization demultiplexing, and phase compensation are referred to in the art, and are not specifically limited herein.

In the technique of the present disclosure, by directly determining a pre-stored clock frequency offset value as a parameter required at the time of clock recovery, time for recalculating the clock frequency offset value can be saved. And because the clock frequency offset value is determined based on the average value of the historical clock frequency offset value, the clock frequency offset value can be directly used as the clock frequency offset value during clock recovery, and the accuracy and the stability of signal processing can be ensured.

In one example, step S40: determining a pre-stored clock frequency offset value corresponding to the target route, where the pre-stored clock frequency offset value is determined according to an internal clock sampling frequency and a signal clock frequency of a signal sent by a sending end in a preset time period before route switching, and may further include:

based on the length of the route, determining the transmission time of the signal sent by the sending end to the service board card through the route;

collecting signal clock frequency of a signal sent by a sending end, and collecting internal clock sampling frequency of a service board card after the transmission time according to the transmission time; determining a clock frequency offset value at the current moment based on the signal clock frequency and the internal clock sampling frequency;

and carrying out average value calculation on each clock frequency offset value determined in a preset time period to obtain a pre-stored clock frequency offset value.

In one example, the signal processing method is executed by a service board, and the route capable of performing signal transmission with the service board includes a main route and a standby route, where the main route and the standby route receive signals sent by the same sending end, and send signals received from the sending end (another service board) to the service board at the same time, but the service board performs signal transmission with only one of the main route and the standby route under the action of the light protection board.

As shown in fig. 5, before performing the signal processing method, the method further includes:

and determining the pre-stored dispersion compensation quantity corresponding to the main route and the standby route respectively. The pre-stored dispersion compensation quantity is determined according to each historical dispersion compensation quantity of the main route and the standby route which are continuously recorded in a preset time period before route switching.

And determining pre-stored signal frequency offset values corresponding to the main route and the standby route respectively. The pre-stored signal frequency offset value is determined according to the frequency offset difference between the central wavelength of the receiving laser in the service board card and the central wavelength of the transmitting laser at the transmitting end, which are continuously recorded at the previous moment of route switching.

And determining the pre-stored clock frequency offset values corresponding to the main route and the standby route respectively. And continuously recording the internal clock sampling frequency of the service board card and the signal clock frequency of the signal sent by the sending end according to the pre-stored clock frequency offset value of the main route and when the signal is transmitted through the main route in a preset time period before route switching.

And continuously recording the internal clock sampling frequency of the service board card and the signal clock frequency of the signal sent by the sending end to determine according to the pre-stored clock frequency offset value of the standby route when the signal is transmitted through the standby route in a preset time period before route switching.

Performing a signal processing method comprising:

Under the condition that the light protection board card determines that the main route connected with the service board card falls off in light power, switching the route for carrying out data transmission with the service board card, and connecting the standby route with the service board card;

under the condition that the service board card determines that the route switching is completed, determining a target route (i.e. a standby route) of the current transmission signal;

and receiving the signal transmitted by the target route.

And determining a pre-stored dispersion compensation amount corresponding to the target route, and performing dispersion compensation on the signal received from the target route according to the pre-stored dispersion compensation amount.

And determining a pre-stored signal frequency offset value corresponding to the target route, and performing rough estimation frequency offset compensation on the dispersion compensated signal according to the pre-stored signal frequency offset value.

And determining a pre-stored clock frequency offset value corresponding to the target route, and recovering the current internal clock sampling frequency of the service board card according to the pre-stored clock frequency offset value.

After the internal clock sampling frequency is recovered, the signal is frame synchronized.

And polarization demultiplexing is carried out on the signals after frame synchronization.

And (3) clock tracking is carried out on the clock with the recovered internal clock sampling frequency so as to regulate and optimize the internal clock sampling frequency.

And carrying out fine estimation frequency offset compensation based on the signal subjected to coarse estimation frequency offset compensation, thereby completing signal recovery.

In one example, after the service board receives the signal, the service board performs photoelectric conversion on the received optical signal, and the conversion from the optical signal to the electrical signal is implemented through a coherent optical receiver. And then sampling, extracting and digital quantizing the electric signals through an analog-to-digital converter, and providing a precondition for subsequent digital signal processing.

In one example, frame synchronization is based on clock synchronization, with an alignment at the frame granularity, facilitating overhead and pilot signal extraction and detection.

In one example, current coherent optical communications generally modulate traffic information in two mutually orthogonal polarization states that can remain independent of each other during transmission and are separately received at the receiving end. A constant modulus algorithm may be used for QPSK (Quadrature Phase Shift Keying ) modulation patterns in general, and a multimode algorithm may be employed for polarization demultiplexing for higher order QAM (Quadrature Amplitude Modulation ) patterns.

In one example, the clock tracking module is mainly used for detecting deviation allowance after signal clock recovery, so as to feed back to the clock recovery module for parameter optimization.

In one example, in addition to frequency offset compensation, a phase difference between a transmitted optical signal carrier and a received optical signal carrier is required

And compensating. Different phase estimation methods are provided for different modulation models, and taking QPSK as an example, the phase estimation formula is as follows:

the QPSK modulation patterns are respectively 0, pi/2, pi and 3 pi/2, after the received signal is four times, the phase angles of the normal signal are all changed into integer multiples of 2 pi, and are respectively 0,2 pi, 4 pi and 6 pi, and the angles of the normal received signal on a coordinate system return to 0 point. The angle of the signal in the coordinate system is the phase deviation of the transmitted light signal and the received light signal

Averaging the plurality of received signals may result in a phase estimate. Arg is the angle of the complex plane. The phase estimation generally adopts forward feedback, and converges based on a minimum mean square error algorithm.

According to an embodiment of the present disclosure, as shown in fig. 6, the present disclosure further provides a signal processing apparatus 600, including:

a determining module 610, configured to determine a target route of the current transmission signal according to the switching situation of the routes.

The signal recovery module 620 is configured to perform signal recovery processing on a signal received from the target route based on a pre-stored parameter determined before the route switching.

In one embodiment, the signal recovery module is further configured to perform at least one of a signal recovery processing manner of dispersion compensation, frequency offset compensation, clock recovery, frame synchronization, polarization demultiplexing, and phase compensation on the signal received from the target route based on the pre-stored parameters determined before the route switch.

In one embodiment, the pre-stored parameters include pre-stored dispersion compensation amounts, and the signal recovery module includes:

the first determining sub-module is used for determining a pre-stored dispersion compensation amount corresponding to the target route, and the pre-stored dispersion compensation amount is determined according to each historical dispersion compensation amount of the target route in a preset time period before route switching.

And the dispersion compensation sub-module is used for carrying out dispersion compensation on the signal received from the target route according to the pre-stored dispersion compensation quantity.

And the first signal recovery submodule is used for carrying out frequency offset compensation, clock recovery, frame synchronization, polarization demultiplexing and phase compensation on the signal received from the target route.

In one embodiment, the pre-stored parameters include pre-stored signal frequency offset values, and the signal recovery module includes:

the second determining sub-module is used for determining a pre-stored signal frequency offset value corresponding to the target route, and the pre-stored signal frequency offset value is determined according to the frequency offset difference between the center wavelength of the receiving laser and the center wavelength of the transmitting laser of the transmitting end in the moment before route switching.

And the frequency offset compensation sub-module is used for carrying out frequency offset compensation on the signal received from the target route according to the frequency offset value of the pre-stored signal.

A second signal recovery sub-module for performing dispersion compensation, clock recovery, frame synchronization, polarization demultiplexing, and phase compensation on the signal received from the target route.

In one embodiment, the pre-stored parameters include pre-stored clock frequency offset values, and the signal recovery module includes:

and the third determining submodule is used for determining a pre-stored clock frequency offset value corresponding to the target route, and the pre-stored clock frequency offset value is determined according to the internal clock sampling frequency and the signal clock frequency of the signal sent by the sending end in a preset time period before route switching.

And the clock recovery sub-module is used for recovering the current internal clock sampling frequency according to the pre-stored clock frequency offset value.

And a third signal recovery sub-module for performing dispersion compensation, frequency offset compensation, frame synchronization, polarization demultiplexing, and phase compensation on the signal received from the target route.

The functions of each unit, module or sub-module in each apparatus of the embodiments of the present disclosure may be referred to the corresponding descriptions in the above method embodiments, which are not repeated herein.

According to an embodiment of the present disclosure, as shown in fig. 7, the present disclosure further provides a signal processing system, including:

At least two routes for transmitting optical signals.

The routes may be any route structure in the prior art, and are not specifically limited herein.

The light protection board card 73 includes a high-speed optical switch 731, a processor 732, and a first optical power detector 733. The input terminal of the high-speed optical switch 731 is connected to each route, the first optical power detector 733 is connected to each route, the processor 732 is connected to the high-speed optical switch 731 and the first optical power detector 733, and the processor 732 is configured to control the connection state of the high-speed optical switch 731 and each route according to the optical power of each route detected by the first optical power detector 733.

The service card 74 includes the signal processing device 600 of any of the above embodiments, and the signal processing device is connected to the output terminal of the high-speed optical switch 731.

Each route may be connected to one first optical power detector 733 at the same time, or may be connected to one first optical power detector 733 separately. The optical power of each route may be detected by the first optical power detector 733.

The first optical power detector 733 may be any optical power detector in the related art, for example, an optical power meter, or a sensor, etc., and is not particularly limited herein. The number of first optical power detectors 733 may be selected and adjusted as desired. For example, each route may be connected to one first optical power detector 733, respectively, to implement separate optical power detection for the corresponding route by each first optical power detector 733. As another example, each route is connected to the same first optical power detector 733 to enable optical power detection of each route by one first optical power detector 733. Specifically, the detection end of the first optical power detector 733 may be branched into a plurality of branches in parallel, where each branch is connected to each route in a one-to-one correspondence manner, and each branch samples the optical power of each route according to the sampling sequence, and feeds back the optical power to the first optical power detector 733 in sequence according to the sampling sequence.

The high speed optical switch 731 may be any non-mechanical optical switch, wherein the optical switch is an optical device with one or more selectable transmission ports that function to physically switch optical signals in an optical transmission line or integrated optical circuit. . For example, the high-speed optical switch 731 may be a magneto-optical switch, an electro-optical switch, or an SOA (Semiconductor Optical Amplifier ) optical switch, or the like. The high-speed optical switch 1 specifically selected can be adjusted according to the requirement of the route switching speed.

The number of inputs to the high speed optical switch 731 can be selected and adjusted as desired. In the case where the number of input terminals of the high-speed optical switch 731 is plural, the connection of the input terminals of the high-speed optical switch 731 to the respective routes can be understood as: each input of the high-speed optical switch 731 may be connected to a path route in a one-to-one correspondence, for example, the high-speed optical switch 731 has an input a and an input B, and the route includes a route C and a route D, and then the input a is connected to the route C and the input B is connected to the route D. That is, the input of each high-speed optical switch 731 is capable of transmitting the signal corresponding to the routing transmission to the output of the high-speed optical switch 731.

The processor 732 may employ an MCU (micro control unit) or an FPGA (Field Programmable Gate Array ).

The connection state of the high-speed optical switch 731 to each route can be switched. The processor 732 controls the connection state of the high-speed optical switch 731 and each route, and it can be understood that the processor 732 can control which route the high-speed optical switch 731 is specifically connected to achieve signal transmission to the output end of the high-speed optical switch 731, and which route is connected to but not connected to, so that the signal transmitted by the route cannot be transmitted to the output end of the high-speed optical switch 731. That is, the high-speed optical switch 731 can select and receive signals transmitted by each route.

Conventional mechanical optical switches are limited by the physical limits of hardware switching, which takes about 6ms (milliseconds) for routing switching, which cannot meet the demand for fast switching of routes. The technology of the present disclosure adopts the high-speed optical switch 731, so that the switching process is not limited by the physical limit of hardware switching, the speed of route switching can be improved, the time consumed by route switching is reduced, and the time consumed by route switching reaches the μs (microsecond) level, even ns (nanosecond) level. The data loss caused by unstable signal transmission in the route switching process is effectively relieved, and the data loss is reduced.

In one example, the magneto-optical switch is an optical switch utilizing faraday magneto-optical effect, and the angle of the polarization plane of the incident polarized light by the magneto-optical crystal is changed by changing the external magnetic field, so as to achieve the effect of optical path switching. The point optical switch is a component which changes the refractive index of a material and the phase of light under the action of an electric field by utilizing the electro-optic effect or the electro-absorption effect of materials such as ferroelectric, compound semiconductor, organic polymer and the like and the plasma dispersion effect of a silicon material, and then makes the light intensity suddenly change or the light path change by utilizing the methods such as light interference or polarization and the like. When a terahertz electric field is applied to the electro-optic crystal, the refractive index of the electro-optic crystal changes. And after the linearly polarized light pulse passes through the electro-optic crystal, the polarization direction of the linearly polarized light pulse can be changed along with the change of the terahertz electric field. The working modes of the high-speed optical switch are non-mechanical route switching, so that the switching speed of the route can be effectively improved, and the time consumed by route switching can be reduced.

In one example, each route is capable of transmitting signals to each input of the high-speed optical switch 731 because each route is connected in one-to-one correspondence with each input of the high-speed optical switch 731. However, since the high-speed optical switch 731 can only communicate with one route in the working state, the high-speed optical switch 731 can only transmit signals of one route to which one input terminal is currently connected to the service board 74 through the output terminal.

In one embodiment, as shown in fig. 7, each route may include a first route 71 and a second route 72. The input end of the high-speed optical switch 731 is connected to the first route 71 and the second route 72, the first optical power detector 733 is connected to the first route 71 and the second route 72, the processor 732 is connected to the high-speed optical switch 731 and the first optical power detector 733, and the processor 732 is configured to control the connection state of the high-speed optical switch 731 and the first route 71 and the second route 72 according to the optical powers of the routes detected by the first optical power detector 733.

In one embodiment, in the case where the processor 732 employs an FPGA, the polling detection time interval of the optical power may reach the μs level, and the hardware FPGA may perform hardware averaging on each collected optical power, where the number of times is less than 100, so as to filter out the extreme power jitter. The detection time of the light protection board card on the light power is ensured to be less than 100 mu s. Therefore, the speed and time of optical power drop detection are accelerated, and the time required by route switching is further improved.

In one embodiment, the output end of the high-speed optical switch 731 is connected to a second optical power detector 734, the second optical power detector 734 is connected to the processor 732, and the processor 732 determines the connection state of the high-speed optical switch and each route according to the detection results of the first optical power detector 733 and the second optical power detector 734.

Determining the connection status of the high speed optical switch to each route is understood to mean determining, by the processor 732, with which route the high speed optical switch 731 is currently in signal communication.

The second optical power detector 734 may be any optical power detector known in the art, such as an optical power meter, or a sensor, and is not specifically limited herein.

In one embodiment, the high speed optical switch 731 is a magneto-optical switch, an electro-optical switch, or a semiconductor SOA (semiconductor optical amplifier ) optical switch.

In one example, the light protection board card 73 includes an MCU and an FPGA. The input end of the high-speed optical switch 731 is connected to the first route 71 and the second route 72, the first optical power detector 733 is connected to the first route 71 and the second route 72, the FPGA is connected to the high-speed optical switch 731 and the first optical power detector 733, and the FPGA is configured to control the connection state of the high-speed optical switch 731 and the first route 71 and the second route 72 according to the optical powers of the first route 71 and the second route 72 detected by the first optical power detector 733. The MCU is connected to the FPGA for controlling the FPGA and other devices in the light protection board card 73, such as the splitter 735.

In one example, the light protection board card 73 includes an MCU and an FPGA. The input terminal of the high-speed optical switch 731 is connected to the first route 71 and the second route 72, respectively, the first optical power detector 733 is connected to the first route 71 and the second route 72, and the FPGA is connected to the high-speed optical switch 731 and the first optical power detector 733. The output end of the high-speed optical switch 731 is connected to a second optical power detector 734, the second optical power detector 734 is connected to an FPGA, and the FPGA determines the connection states of the high-speed optical switch and the first route 71 and the second route 72 according to the detection results of the first optical power detector 733 and the second optical power detector 734. The FPGA is further configured to control the connection states of the high-speed optical switch 731 and the first route 71 and the second route 72 according to the optical powers of the first route 71 and the second route 72 detected by the first optical power detector 733. The MCU is connected to the FPGA for controlling the FPGA and other devices in the light protection board card 73.

In one example, the light protection board card 73 may be applied to a signal transmitting end and a signal receiving end. Therefore, the light protection board card 73 may include both a device that receives a signal and a device that transmits a signal.

In one example, as shown in fig. 8, the light protection board card 73 includes a high-speed optical switch 731, a processor 732, and a first optical power detector 733. The light protection board card 73 further includes a light splitter 735. When the optical protection board 73 is applied to the signal transmitting end, the optical splitter 735 splits the signal transmitted by the service board 74 at the transmitting end into two identical paths of signals, and the two paths of signals are respectively transmitted to the route 71 and the route 72, so that the two paths transmit the signal to the service board at the receiving end.

When the optical protection board card 73 is applied to the signal receiving end, the optical protection board card 73 is connected with two routes through the high-speed optical switch 731, and signals of one route are transmitted to the service board card 74 of the receiving end through the high-speed optical switch 731.

Since the signal transmission is generally bidirectional, that is, there is signal transmission and signal feedback, the optical protection board 73 may include both the splitter 735 and the high-speed optical switch 731, and the lines of the two structures do not interfere with each other. That is, the light protection board 73 may be a receiving end or a transmitting end.

Specifically, in the case of including the first service board and the second service board, the signal transmitted by the first service board may be transmitted to the high-speed optical switch 731 of the optical protection board 73 through each route, so that the high-speed optical switch 731 transmits a signal of one route to the second service board. The signal sent by the second service board card may be sent to each route through the optical splitter 735 of the optical protection board card 73, so that the signal sent by the second service board card is transmitted to the first service board card through each route.

In one embodiment, the number of routes is two. In the case where the optical protection board card 73 is in the optical protection switching operation mode, two routes are respectively connected to one input end of the high-speed optical switch 731, two routes are respectively connected to one first optical power detector 733, and an output end of the high-speed optical switch 731 is communicated with the service board card 74.

When the optical protection board 73 is in the signal distribution operation mode, the upstream optical interface (input end) of the optical splitter 735 is connected to the service board 74, and each downstream optical interface (output end) of the optical splitter 735 is connected to each route.

In one example of application, as shown in fig. 9, the signal processing system includes a transmitting end located at a ground and a receiving end located at B ground. The transmitting end and the receiving end are defined according to the signal transmission direction, and the ground A can be used as the receiving end and the ground B can be used as the transmitting end.

The transmitting end includes a first service card 91, a first optical protection board card 92, a first wavelength division multiplexer 93, and a first optical amplifier 94. The first service card 91 is connected to the first optical protection board card 92, and the first optical protection board card 92 is connected to the first optical fiber route and the second optical fiber route through optical splitters, respectively. A first wavelength division multiplexer 93 and a first optical amplifier 94 are provided between the first optical protection board card 92 and the first optical fiber route and between the first optical protection board card 92 and the second optical fiber route.

The receiving end includes a second service card 98, a second optical protection board card 97, a second wavelength division multiplexer 96, and a second optical amplifier 95. The first optical fiber route and the second optical fiber route are respectively connected with the input end of the high-speed optical switch of the second optical protection board card 97. A second wavelength division multiplexer 96 and a second optical amplifier 95 are provided between the second optical protection board card 97 and the first optical fiber route and between the second optical protection board card 97 and the second optical fiber route. The output end of the high-speed optical switch of the second optical protection board card 97 is connected to the second service board card 98.

The first light protection board 92 and the second light protection board 97 may be the light protection device of any of the above embodiments. The first service card 91 and the second service card 98 may be service ends of any of the above embodiments.

In a variable application example, as shown in fig. 10, the transmitting end includes a first service card 91, a first optical protection board card 92, a first wavelength division multiplexer 93, and a first optical amplifier 94. The first service card 91 is connected to a first wavelength division multiplexer 93, the first wavelength division multiplexer 93 is connected to a first optical protection board card 92, and the first optical protection board card 92 is connected to an optical fiber route one and an optical fiber route two through optical splitters, respectively. A first optical amplifier 94 is provided between the first optical protection board card 92 and the first optical fiber route and between the first optical protection board card 92 and the second optical fiber route.

The receiving end includes a second service card 98, a second optical protection board card 97, a second wavelength division multiplexer 96, and a second optical amplifier 95. The first optical fiber route and the second optical fiber route are respectively connected with the input end of the high-speed optical switch of the second optical protection board card 97. A second optical amplifier 95 is provided between the second optical protection board card 97 and the first optical fiber route and between the second optical protection board card 97 and the second optical fiber route. The output end of the high-speed optical switch of the second optical protection board 97 is connected to the second wavelength division multiplexer 96, and the second wavelength division multiplexer 96 is connected to the second service board 98.

In a variable application example, as shown in fig. 11, the transmitting end includes a first service card 91, a first optical protection board card 92, a first wavelength division multiplexer 93, and a first optical amplifier 94. The first service board 91 is connected to a first wavelength division multiplexer 93, the first wavelength division multiplexer 93 is connected to a first optical amplifier 94, the first optical amplifier 94 is connected to a first optical protection board 92, and the first optical protection board 92 is connected to an optical fiber route one and an optical fiber route two through optical splitters, respectively.

The receiving end includes a second service card 98, a second optical protection board card 97, a second wavelength division multiplexer 96, and a second optical amplifier 95. The first optical fiber route and the second optical fiber route are respectively connected with the input end of the high-speed optical switch of the second optical protection board card 97. The output end of the high-speed optical switch of the second optical protection board 97 is connected to a second optical amplifier 95, the second optical amplifier 95 is connected to a second wavelength division multiplexer 96, and the second wavelength division multiplexer 96 is connected to a second service board 98.

According to an embodiment of the present disclosure, the present disclosure further provides a signal processing method, which may be applied to the signal processing system of the foregoing embodiment, where the processor adopts an FPGA, and the FPGA includes a plurality of registers, and the signal processing method includes:

s1: based on the obtained optical power detection result of the route, the FPGA updates the optical power detection result stored in the register group corresponding to the route. Wherein the register set is configured for routing in advance.

S2: and the FPGA calculates the optical power of the route according to the optical power detection result stored in each register in the updated register group.

S3: and under the condition that the optical power of the route is lower than the threshold value, the service board card controls the optical switch to interrupt signal transmission with the route and controls the optical switch to be switched to be communicated with another route so as to continue signal transmission.

S4: and the service board card determines the target route of the current transmission signal according to the route switching condition.

S5: the service board card performs signal recovery processing on the signal received from the target route based on the pre-stored parameters determined before the route switching.

In one example, S5: based on the pre-stored parameters determined before the route switching, the signal recovery processing is performed on the signal received from the target route, and the method comprises the following steps: and carrying out at least one signal recovery processing mode of dispersion compensation, frequency offset compensation, clock recovery, frame synchronization, polarization demultiplexing and phase compensation on the signal received from the target route based on the pre-stored parameters determined before route switching.

The specific manner of steps S4 and S5 refers to the above embodiments of the present disclosure, and will not be described herein.

In one example, S1: the FPGA updates the optical power detection result stored in each register in the register group corresponding to the route based on the obtained optical power detection result of the route, and may further include:

s50: and under the condition that the optical power detection result of the first route is obtained, determining a target register in which the optical power detection result is stored earliest in the register group corresponding to the first route.

The target register in which the optical power detection result is stored earliest may be understood as a register in which the retention time of the stored optical power detection result is longest when each register in the register group stores the optical power detection result of the first route.

For example, the register set is composed of A, B, C, D four registers. Wherein, the register A is the optical power detection result stored in the first millisecond, the register B is the optical power detection result stored in the second millisecond, the register C is the optical power detection result stored in the third millisecond, and the register D is the optical power detection result stored in the fourth millisecond. And determining that the time of the optical power detection result stored in the register A is longest according to the storage time of each optical power detection result in the register, namely the register A is a target register.

S51: and updating the optical power detection result stored in the target register based on the acquired optical power detection result of the first route.

Updating the optical power detection result stored in the target register may be understood as covering the optical power detection result of the acquired first route with the optical power detection result stored in the target register, or may be understood as deleting the optical power detection result stored in the target register and storing the optical power detection result of the acquired first route.

In the technology disclosed by the disclosure, by updating the data stored in one register in the register set each time, not only can the current optical power of the route be effectively monitored, but also the stability of the optical power calculation result can be ensured, and the calculation result of the whole register set is not influenced when the optical power detection result of an unstable optical signal of the first route is acquired, so that the erroneous judgment on the optical power condition of the first route is avoided.

In one specific application example concerning steps S50 and S51, the register group is composed of A, B, C, D four registers. Wherein, the register A is the optical power detection result stored in the first millisecond, the register B is the optical power detection result stored in the second millisecond, the register C is the optical power detection result stored in the third millisecond, and the register D is the optical power detection result stored in the fourth millisecond. And determining that the time of the optical power detection result stored in the register A is longest according to the storage time of each optical power detection result in the register, namely the register A is a target register. Thus, the obtained optical power detection result of the first route is updated into the register a.

s60: when the optical power detection result of the first route is obtained, the optical power detection result in the first register on the predetermined time node is deleted according to the time sequence in which the optical power detection results are stored in the registers.

For example, the register set is composed of A, B, C, D four registers. Wherein, the register A is the optical power detection result stored in the first millisecond, the register B is the optical power detection result stored in the second millisecond, the register C is the optical power detection result stored in the third millisecond, and the register D is the optical power detection result stored in the fourth millisecond. The first register is a register a, the second register is a register B, the third register is a register C, and the fourth register is a register D, in the order from the early to the late of the optical power detection result stored in each register. Therefore, it is necessary to delete the optical power detection result already stored in the register a (i.e., the first register on the predetermined time node).

S61: and sequentially storing the optical power detection results stored in other registers except the first register in the register group into the previous register.

For example, the register set is composed of A, B, C, D four registers. The first register is a register A, the second register is a register B, the third register is a register C, and the fourth register is a register D according to the order of the optical power detection results stored in the registers from the early to the late. The optical power detection result stored in the first register a is deleted, the optical power detection result stored in the register B is stored in the previous register (i.e., register a), the optical power detection result stored in the register C is stored in the previous register (i.e., register B), and the optical power detection result stored in the register D is stored in the previous register (i.e., register C).

S62: and storing the acquired optical power detection result of the first route into a last register.

The last register is understood to be the register in which the optical power detection results are stored in the order from the early to the late for each register.

For example, the register set is composed of A, B, C, D four registers. Wherein, the register A is the optical power detection result stored in the first millisecond, the register B is the optical power detection result stored in the second millisecond, the register C is the optical power detection result stored in the third millisecond, and the register D is the optical power detection result stored in the fourth millisecond. Then register D serves as the last register in the order in which the registers store the optical power detection results from early to late.

After the optical power detection result stored in the first register a is deleted and the optical power detection result stored in the register B is stored in the previous register (i.e., the register a), the optical power detection result stored in the register C is stored in the previous register (i.e., the register B), and the optical power detection result stored in the register D is stored in the previous register (i.e., the register C), no data is stored in the register D, so that the obtained optical power detection result of the first route can be directly stored in the last register D.

In one example, step S2: the FPGA calculates the optical power of the route according to the optical power detection result stored in each updated register, and may further include:

And calculating an average value according to the updated optical power detection results stored in the registers so as to determine the optical power of the first route.

In the disclosed technology, the optical power of the first route can be rapidly calculated in a hardware averaging mode, and the accuracy and the referenceable value of the calculation result can be ensured.

According to embodiments of the present disclosure, the present disclosure also provides an electronic device, a readable storage medium and a computer program product.

Fig. 12 shows a schematic block diagram of an example electronic device 1200 that can be used to implement embodiments of the present disclosure. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular telephones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the disclosure described and/or claimed herein.

As shown in fig. 12, the electronic device 1200 includes a computing unit 1201 that can perform various appropriate actions and processes according to a computer program stored in a Read Only Memory (ROM) 1202 or a computer program loaded from a storage unit 12012 into a Random Access Memory (RAM) 1203. In the RAM 1203, various programs and data required for the operation of the electronic device 1200 may also be stored. The computing unit 1201, the ROM1202, and the RAM 1203 are connected to each other via a bus 1204. An input output (I/O) interface 1205 is also connected to the bus 1204.

Various components in the electronic device 1200 are connected to the I/O interface 1205, including: an input unit 1206 such as a keyboard, mouse, etc.; an output unit 1207 such as various types of displays, speakers, and the like; a storage unit 1208 such as a magnetic disk, an optical disk, or the like; and a communication unit 1209, such as a network card, modem, wireless communication transceiver, etc. The communication unit 1209 allows the electronic device 1200 to exchange information/data with other devices through a computer network, such as the internet, and/or various telecommunications networks.

The computing unit 1201 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of computing unit 1201 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various computing units running machine learning model algorithms, digital Signal Processors (DSPs), and any suitable processor, controller, microcontroller, etc. The computing unit 1201 performs the various methods and processes described above, such as signal processing methods. For example, in some embodiments, the signal processing method may be implemented as a computer software program tangibly embodied on a machine-readable medium, such as storage unit 1208. In some embodiments, part or all of the computer program may be loaded and/or installed onto the electronic device 1200 via the ROM1202 and/or the communication unit 1209. When a computer program is loaded into the RAM 1203 and executed by the computing unit 1201, one or more steps of the signal processing method described above may be performed. Alternatively, in other embodiments, the computing unit 1201 may be configured to perform the signal processing method by any other suitable means (e.g., by means of firmware).

Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.

Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program code may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus such that the program code, when executed by the processor or controller, causes the functions/operations specified in the flowchart and/or block diagram to be implemented. The program code may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.

In the context of this disclosure, a machine-readable medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. The machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

To provide for interaction with a user, the systems and techniques described here can be implemented on a computer having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and pointing device (e.g., a mouse or trackball) by which a user can provide input to the computer. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.

The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), and the internet.

The computer system may include a client and a server. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other.

It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps recited in the present disclosure may be performed in parallel, sequentially, or in a different order, provided that the desired results of the disclosed aspects are achieved, and are not limited herein.

The above detailed description should not be taken as limiting the scope of the present disclosure. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present disclosure are intended to be included within the scope of the present disclosure.

Claims

1. A signal processing method, the method performed by a service card, the method comprising:

and performing clock recovery on the signal received from the target route based on the pre-stored clock frequency offset value of the pre-stored parameter determined before the route switching.

2. The method of claim 1, wherein the clock recovery of the signal received from the target route based on pre-stored parameters determined prior to route switching comprises:

determining a pre-stored clock frequency offset value corresponding to the target route, wherein the pre-stored clock frequency offset value is determined according to the internal clock sampling frequency and the signal clock frequency of a signal sent by a sending end in a preset time period before route switching;

and recovering the current internal clock sampling frequency according to the pre-stored clock frequency offset value.

3. The method of claim 2, wherein the pre-stored clock frequency offset value is obtained by:

based on the length of the route, determining the transmission time of a signal sent by a sending end to a service board card through the route, collecting the signal clock frequency of the signal sent by the sending end, collecting the internal clock sampling frequency of the service board card before route switching after the transmission time according to the transmission time, determining the clock frequency offset value at the current moment based on the signal clock frequency and the internal clock sampling frequency, and calculating the average value of the clock frequency offset values determined in a preset time period before route switching to obtain the pre-stored clock frequency offset value.

4. The method of claim 1, wherein the method further comprises:

and performing at least one of frame synchronization, polarization demultiplexing and phase compensation signal recovery processing on the signal received from the target route based on the pre-stored parameters determined before the route switching.

5. The method of claim 1, wherein the pre-stored parameters comprise a pre-stored dispersion compensation amount;

the method further comprises the steps of:

determining a pre-stored dispersion compensation quantity corresponding to the target route, wherein the pre-stored dispersion compensation quantity is determined according to each historical dispersion compensation quantity of the target route in a preset time period before route switching;

And performing dispersion compensation on the signal received from the target route according to the pre-stored dispersion compensation quantity.

6. A signal processing apparatus, a service card comprising the signal processing apparatus, the signal processing apparatus comprising:

and the signal recovery module is used for carrying out clock recovery on the signal received from the target route based on the pre-stored clock frequency offset value of the pre-stored parameter determined before the route switching.

7. The apparatus of claim 6, wherein the signal recovery module comprises:

a third determining submodule, configured to determine a pre-stored clock frequency offset value corresponding to the target route, where the pre-stored clock frequency offset value is determined according to an internal clock sampling frequency and a signal clock frequency of a signal sent by a sending end in a preset time period before route switching;

8. The apparatus of claim 7, wherein in the third determining submodule, based on a length of a route, a transmission time when a signal sent by a sending end arrives at a service board through the route is determined, a signal clock frequency of the signal sent by the sending end is collected, an internal clock sampling frequency of the service board before route switching after the transmission time is collected according to the transmission time, a clock frequency offset value at a current moment is determined based on the signal clock frequency and the internal clock sampling frequency, and an average value is calculated for each clock frequency offset value determined in a preset time period before route switching to obtain the pre-stored clock frequency offset value.

9. The apparatus of claim 6, wherein the signal recovery module is further configured to perform at least one of frame synchronization, polarization demultiplexing, and phase compensation on the signal received from the target route based on pre-stored parameters determined prior to route switching.

10. The apparatus of claim 6, wherein the pre-stored parameters comprise pre-stored dispersion compensation amounts, and the signal recovery module comprises:

a first determining submodule, configured to determine a pre-stored dispersion compensation amount corresponding to the target route, where the pre-stored dispersion compensation amount is determined according to each historical dispersion compensation amount of the target route in a preset time period before route switching;

11. A signal processing system, comprising:

at least two routes for transmitting signals;

Service card comprising a signal processing device according to any of claims 6 to 10, said signal processing device being connected to an output of said high speed optical switch.

12. The signal processing system according to claim 11, wherein a second optical power detector is connected to an output end of the high-speed optical switch, the second optical power detector is connected to the processor, and the processor determines a connection state of the high-speed optical switch and the route according to detection results of the first optical power detector and the second optical power detector.

13. The signal processing system of claim 11, wherein the high speed optical switch is a magneto-optical switch, an electro-optical switch, or a semiconductor optical amplifier SOA optical switch.

14. The signal processing system of claim 11, wherein the processor is a micro control unit MCU or a field programmable gate array FPGA.

15. An electronic device, comprising:

at least one processor; and

the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1 to 5.

16. A non-transitory computer readable storage medium storing computer instructions for causing a computer to perform the method of any one of claims 1 to 5.

17. A computer program product comprising a computer program which, when executed by a processor, implements the method according to any one of claims 1 to 5.