CN115694621A

CN115694621A - Signal processing method and signal processing system

Info

Publication number: CN115694621A
Application number: CN202211308816.1A
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: 2023-02-03
Also published as: CN115694620A; CN116318378A; CN113098592B; CN113098592A; CN116346215A

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 route; and performing signal recovery processing on the signal received from the target route based on the pre-stored parameters determined before 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 the chinese patent application having an application date of 2021, 03/31/month, an application number of 202110350734.2, entitled "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 a drop in optical power of a signal transmitted by a route is detected, route switching is required to protect the optical transmission network from continuing data transmission. However, since the time for the route switching and the time for the signal recovery process are long, a large amount of data loss may be caused to the data transmitted in the optical transmission network.

Disclosure of Invention

The 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 route;

and performing signal recovery processing on the signal received from the target route based on the pre-stored parameters determined before 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 route;

and the signal recovery module is used for performing 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 respectively connected with the route, 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;

and the service board card comprises the signal processing device in the aspect, 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 content of the first and second substances,

the memory stores instructions executable by the at least one processor to cause the at least one processor 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 non-transitory computer readable storage medium storing computer instructions for causing a computer to perform a method in any embodiment of the present disclosure.

According to another aspect of the present disclosure, a computer program product is provided, 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 statements in this section do not necessarily identify key or critical features of the embodiments of the present disclosure, nor do they limit the scope of the present disclosure. Other features of the present disclosure will become apparent from the following description.

Drawings

The drawings are included to provide 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 diagram of a signal processing apparatus according to an embodiment of the present application;

FIG. 7 is a block diagram of a signal processing system according to an embodiment of the present application;

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

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

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

FIG. 11 is a schematic block 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 according to an embodiment of the present application.

Detailed Description

Exemplary embodiments of the present disclosure are described below with reference to the accompanying drawings, in which various details of embodiments of the present disclosure are included to assist understanding, and which are to be considered as merely exemplary. Accordingly, those 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 applied to a service board, including:

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

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 route 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 routing can also be realized by artificial active intervention, namely, the artificial active switching and the service board card carry out the routing of signal transmission. The switching of the route can also automatically trigger the optical protection board card to switch after the service board card detects that the optical power of the route falls.

The service board card can be used as a terminal for signal transmission, and the service board card can also be used as a transfer station for signal transmission. After the signal sent by the optical protection board card is transmitted to the service board card, the service board card can directly utilize the received signal to execute some operations, and can also process the received signal and send the processed signal to other terminals. The specific product corresponding to the service board card is not specifically limited, and the service board card can be understood as the device capable of processing the signal. For example, the service board may be a mobile terminal, a server, a cloud, a computer, or the like.

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

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

The pre-stored parameters are used for accelerating the signal recovery processing speed. By pre-storing the parameters, the service board card can quickly realize the quick recovery processing of the signal 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 obtained and recorded when the target route and the service board transmit signals. That is, the pre-stored parameters are parameters related to signal transmission, which are obtained and recorded when the target route and the service board transmit signals within a predetermined time. The preset time may be any time period when the target route and the service board transmit signals. For example, the signal transmission is started from the target routing and traffic board to the end of the signal transmission. As another example, a certain time period before the end of signal transmission of the target route and the traffic board. The pre-stored parameters may represent characteristics of a target route transmission signal, characteristics of a service board receiving and performing signal processing, characteristics of a board transmitting a signal to the target route (for example, a service board transmitting a signal to the target route), and the like.

The specific process of the signal recovery processing can refer to the signal processing manner in the prior art. For example, dispersion compensation, frequency offset compensation, clock recovery, frame synchronization, polarization demultiplexing, clock tracking, etc. The pre-stored parameters may be understood as parameters that need to be utilized in any of the above signal processing procedures. By directly calling the pre-stored parameters, any one of the signal processing processes does not need to recalculate required parameters during execution, so that the signal processing time is saved, and the accuracy of signal processing can be improved by referring to historical parameters.

The technology disclosed by the invention can be applied to the cloud computing technology, in particular to a data center interconnection optical transmission network. According to the technology disclosed by the invention, the speed of routing 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 this method needs to perform independent calculation and processing on each module performing signal processing in the service board every time, which results in a long time for the whole signal processing. In general, the time for processing digital signals by the method of parameter scanning is between 10ms and 30 ms. Although the time consumed by the parameter scanning method conforms to the standard of 50ms (millisecond) of the ITU (International Telecommunication Union), as the data transmission rate increases, even if the requirement of 50ms is met, a huge amount of data loss may be caused. For example, as optical transmission systems evolve from 10Gb/s to 100Gb/s and 200Gb/s, and even to 400Gb/s and 600Gb/s optical transmission wavelength division systems in the near future, the amount of data loss due to single jitter has increased from 512M (10 Gb/s × 50 ms), to a huge amount of data loss of 20G and 30G. The technology of the present disclosure can significantly reduce the data loss amount compared to the conventional digital signal processing flow because the time of signal recovery processing is increased.

In one example, the target route of the current transmission signal is determined according to the switching situation of the route, which 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 process of route switching, the service board card can be temporarily interrupted, the interruption of the service board card can be recovered after the route switching is completed, and the service board card determines a target route of a current transmission signal according to a signal received after the recovery (the signal is a signal which is transmitted to the board card for controlling the route switching by the switched route 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 an optical protection board card.

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

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

s111: and performing 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 may be understood as parameters that need to be utilized in any of the above signal processing procedures. By directly calling the pre-stored parameters, any one of the signal processing processes does not need to recalculate the required parameters during execution, so that the signal processing time is saved, and the accuracy of signal processing can be improved by referring to historical parameters.

It should be noted that, the signal processing method specifically required to be applied may be added or deleted as needed. That is, the various signal processing procedures mentioned in step S111 are not necessarily all used, and may be deleted on the basis thereof. It may be added to improve the quality of the signal recovery process.

In one embodiment, as shown in fig. 2, the signal processing method includes steps S10 and S11, and the pre-stored parameter includes 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, which may further include:

s20: and determining the pre-stored dispersion compensation amount corresponding to the target route, wherein 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.

The preset time period may be understood as the last time period during which the target router and the service board transmit signals before the method of the present disclosure is executed.

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

The finally determined pre-stored dispersion compensation amount may be determined based on an average value, a maximum value, and a minimum value of the respective historical dispersion compensation amounts. The historical dispersion compensation amount at the last time in the preset time period may also be used as the 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 amount.

As a specific method of dispersion compensation, a dispersion compensation method in the prior art can be referred to, and is not limited specifically herein.

S22: and performing 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.

The specific methods of frequency offset compensation, clock recovery, frame synchronization, polarization demultiplexing, and phase compensation may refer to the related art, and are not limited herein.

It should be noted that the execution sequence of dispersion compensation, frequency offset compensation, clock recovery, frame synchronization, polarization demultiplexing, and phase compensation may be adjusted as needed, and it should not be understood that the order of the text expression is the execution sequence.

In the technology of the present disclosure, by directly determining the pre-stored dispersion compensation amount obtained based on each historical dispersion compensation amount as the dispersion compensation amount required at the time of dispersion compensation, the time for 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 historical data of the current route, it is also possible to ensure the accuracy and stability of signal processing by directly using it as the dispersion compensation parameter at the time of dispersion compensation. The dispersion compensation amount is changed along with the transmission distance of the route, and the transmission distance of the route is usually fixed, so that the predetermined pre-stored dispersion compensation amount does not have large deviation and can be basically considered as the accurate dispersion compensation amount of the current route.

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

l represents the transmission distance, γ represents the nonlinear coefficient, P0 represents the emitted optical 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 effect of dispersion, the amount of dispersion, on transmission can be calculated from the known a (Z = 0) and the received a (Z = L)

Mainly related to the transmission distance L. When the dispersion amount is calculated

In time, dispersion compensation can be performed on all received signals. If the dispersion compensation is wrong, the signal will be superimposed with extra phase noise, which may cause the subsequent signal processing to be invalid.

In one example, when the route is plural, a pre-stored dispersion compensation amount needs to be calculated for each route. The dispersion compensation quantity of each route can be confirmed by manually and actively switching the connection state of the route and the service board card. Or continuously monitoring when the route and the service board card are in a signal transmission state, and recording 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 parameter includes a pre-stored signal frequency offset value. Wherein, the 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, which 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 a receiving laser inside the route switching previous moment and the center wavelength of a transmitting laser at the transmitting end.

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 performing data transmission with the service board card before switching to the target route and performing data transmission with the service board card.

The internal receiving laser may be understood as a laser which is arranged inside the service board card for executing the method of the present disclosure and is used for receiving signals.

The sending end may be understood as a certain board that sends a signal to the route so that the route sends the signal to the service board. The transmitting laser may be understood as a laser arranged inside the transmitting end for transmitting signals. The sending end may be another service board having the same structure as the service board. The two service boards are located at different physical locations.

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

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

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 may refer to the prior art, and are not specifically limited herein.

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

In one example, the following equation is shown:

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

wherein x is _in [k]Representing the input digital signal, x, received at the k-th instant _sym [k]Indicating the original transmitted signal corresponding to the kth time, T _sym Representing the signal sample period interval.

The carrier recovery of the received digital signal mainly needs to compensate the phase noise of two parts, namely the frequency deviation delta f between the center wavelength of the transmitting laser and the center wavelength of the receiving laser and the phase difference between the transmitting optical signal carrier and the receiving optical signal carrier

The frequency offset estimation is used for eliminating a large amount of phase noise, so that the efficiency of phase compensation is improved. Taking QPSK pattern as an example, the frequency offset estimation formula is as follows:

found by means of forward feedback

A peak on the frequency spectrum. Arg is an angle for solving a complex plane, max is a maximum value, frequency deviation delta f represents the frequency deviation between the central wavelength of the sending laser and the central wavelength of the receiving laser, and Tsym represents a signal sampling period interval.

In one example, the speed of light transmission in the optical fiber route is 3 × 10^8m/s, and even in an extreme case, when the distance between the main route and the standby route is different by 80km, the time difference of the optical signals sent by the optical protection system to the two routes to the receiving end (a service board or an optical protection board) is only 0.4ms. In consideration of the stability of the laser, the frequency of the laser shifts in the order of MHz within 0.4ms. Thus. When the service is normal, the frequency offset value of the transceiver laser is continuously recorded and refreshed by the service board card which needs to perform digital signal processing, and when the service is interrupted and recovered, the frequency offset compensation is performed by using the frequency offset value which is refreshed and recorded.

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

In one embodiment, as shown in fig. 4, the signal processing method includes steps S10 and S11, and the pre-stored parameter includes a pre-stored clock frequency offset value. 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 carried out on the signals 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 in a preset time period before route switching and the signal clock frequency of a signal sent by a sending end.

The preset time period may be understood as a last time period during which the target router and the service board perform signal transmission before the method of the present disclosure is performed.

The internal clock sampling frequency can be understood as the sampling frequency of the clock internally set in the service board card for executing the method of the present disclosure.

The sending end may be understood as a certain board that sends a signal to the route so that the route sends the signal to the service board. The signal clock frequency of the emitted signal may be understood as 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 sampling frequency of the internal clock may refer to an internal clock sampling frequency recovery method in the prior art, which is not 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 may refer to the prior art, and are not specifically limited herein.

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

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 within a preset time period before route switching and a signal clock frequency of a signal sent by a sending end, and may further include:

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

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

and calculating the average value of all the determined clock frequency deviation values in the preset time period to obtain a pre-stored clock frequency deviation value.

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

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

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

And determining pre-stored signal frequency offset values corresponding to the main route and the standby route respectively. And determining the pre-stored signal frequency offset value according to the continuously recorded 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 at the moment before the route switching.

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

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

A method of performing signal processing, comprising:

under the condition that the optical protection board card determines that the main route connected with the service board card has optical power drop, switching the route for data transmission with the service board card, and connecting the standby route with the service board card;

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

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 signal after dispersion compensation 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 sampling frequency of the internal clock is recovered, the signals are frame-synchronized.

And carrying out polarization demultiplexing on the signals after frame synchronization.

And performing clock tracking on the clock with the recovered internal clock sampling frequency to adjust and optimize the internal clock sampling frequency.

And performing fine frequency offset estimation compensation based on the signal after the coarse frequency offset estimation compensation, thereby completing signal recovery.

In one example, after the service board receives the signal, the service board performs optical-to-electrical conversion on the received optical signal, and the coherent optical receiver converts the optical signal into an electrical signal. And then the analog-to-digital converter is used for sampling, extracting and digitally quantizing the electric signal, thereby 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 to facilitate overhead and pilot extraction and detection.

In one example, current coherent optical communications generally modulate traffic information on two mutually orthogonal polarization states, which can remain mutually independent during transmission and are separately received at a receiving end. In general, a constant modulus algorithm may be used for a QPSK (Quadrature Phase Shift Keying) Modulation pattern, and a multimode algorithm may be used for a high-order QAM (Quadrature Amplitude Modulation) pattern to implement polarization demultiplexing.

In one example, the clock tracking module is mainly used for detecting the deviation margin after the signal clock is recovered, so as to feed back the deviation margin 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

Compensation is performed. For different modulation models, there are different phase estimation methods, taking QPSK as an example, the phase estimation formula is as follows:

the QPSK modulation code forms are respectively four angles of 0, pi/2, pi and 3 pi/2, after the received signals are taken to be the fourth power, the normal signal phase angles all become integral multiples of 2 pi, which are respectively 0,2 pi, 4 pi and 6 pi, and at the moment, the angles of the normal received signals on a coordinate system return to the point 0. The angle of the signal on the coordinate system is the phase deviation between the transmitted optical signal and the received optical signal

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

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

the determining module 610 is configured to determine a target route of a current transmission signal according to a switching condition of the route.

And a signal recovery module 620, configured to perform signal recovery processing on the signal received from the target route based on the pre-stored parameters determined before the route switching.

In one embodiment, the signal recovery module is further configured to perform at least one 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.

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

and the first determining submodule is used for determining the pre-stored dispersion compensation quantity corresponding to the target route, and 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 the dispersion compensation submodule is used for carrying out dispersion compensation on the signal received from the target route according to the pre-stored dispersion compensation amount.

And the first signal recovery sub-module is used for performing 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:

and the second determining submodule 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 inside the route switching previous moment and the center wavelength of the transmitting laser at the transmitting end.

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

And the second signal recovery sub-module is used for carrying out 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 in a preset time period before route switching and the signal clock frequency of a signal sent by the sending end.

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

And the third signal recovery submodule is used for carrying out 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 device in the embodiments of the present disclosure may refer to the corresponding description in the above method embodiments, and are not described herein again.

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

at least two routes for transmitting optical signals.

Each route may adopt any routing structure in the prior art, and is not specifically limited herein.

The optical protection board 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 of the routes, the first optical power detector 733 is connected to each of the routes, the processor 732 is connected to the high-speed optical switch 731 and the first optical power detector 733, and the processor 732 controls the connection state of the high-speed optical switch 731 to each of the routes based on the optical power of each of the routes detected by the first optical power detector 733.

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

Each route may be simultaneously connected to one first optical power detector 733, or may be connected to one first optical power detector 733. It is sufficient that the optical power of each route can be detected by the first optical power detector 733.

The first optical power detector 733 may be any optical power detector in the prior art, such as an optical power meter, an optical power meter or a sensor, and is not limited in detail herein. The number of the first optical power detectors 733 may be selected and adjusted as necessary. For example, each route may be connected to one first optical power detector 733, respectively, to enable each first optical power detector 733 to perform individual optical power detection on the corresponding route. For another example, each route is connected to the same first optical power detector 733, so as to perform optical power detection on each route through one first optical power detector 733. Specifically, the detection end of the first optical power detector 733 may be branched in parallel to form a plurality of branches, each branch is connected to each route in a one-to-one correspondence manner, and each branch sequentially and respectively samples the optical power of each route according to a sampling sequence and sequentially feeds the optical power to the first optical power detector 733 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 optional 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. The particular selected high speed optical switch 1 may be adjusted according to the routing switching speed requirements.

The number of inputs to the high speed optical switch 731 can be selected and adjusted as desired. When the number of the input terminals of the high-speed optical switch 731 is plural, the input terminals of the high-speed optical switch 731 are connected to the respective routes, which can be understood as follows: each input of the high-speed optical switch 731 can be connected to a corresponding one-to-one route, for example, the high-speed optical switch 731 has an input a and an input B, the route includes a route C and a route D, 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 enables the transmission of a correspondingly routed signal to the output of the high speed optical switch 731.

Processor 732 may be implemented as an MCU (micro controller 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, which can be understood that the processor 732 can control which route the high-speed optical switch 731 is connected to implement signal transmission to the output end of the high-speed optical switch 731, and which route is connected 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 selectively receive signals transmitted by each route.

The conventional mechanical optical switch is limited by the physical limit of hardware switching, and the routing switching takes about 6ms (milliseconds), which cannot meet the requirement of fast routing switching. 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 routing switching can be increased, the time consumed by routing switching can be reduced, and the time consumed by routing switching can reach the level of μ s (microseconds), even ns (nanoseconds). The data loss condition caused by unstable signal transmission in the route switching process is effectively relieved, and the data loss amount 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 magneto-optical crystal to the incident polarized light is changed by changing an external magnetic field, so that the effect of optical path switching is achieved. The point optical switch is generally an element that changes the refractive index of a material and the phase of light under the action of an electric field by using the electro-optic effect or the electric absorption effect of materials such as ferroelectrics, compound semiconductors, organic matter polymerization and the plasma dispersion effect of silicon materials, and then changes the light intensity suddenly or changes the light path by using methods such as light interference or polarization. When a terahertz electric field is loaded on the electro-optic crystal, the refractive index of the electro-optic crystal is changed. After the linearly polarized light pulse passes through the electro-optical crystal, the polarization direction of the linearly polarized light pulse can change 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 a signal to each input of the high speed optical switch 731 since each route is connected in a 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 operating state, the high-speed optical switch 731 can only transmit a signal of the route, which is currently communicated with one input terminal, 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, respectively, 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 with the first route 71 and the second route 72 according to the optical power of each route 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 a level of μ s, and the hardware FPGA may perform hardware averaging on each collected optical power for times less than 100 times, so as to filter out the extreme power jitter. The detection time of the optical protection board card on the optical power is ensured to be less than 100 mus. Therefore, the speed and time for detecting the optical power drop are accelerated, and the time for switching the route is further prolonged.

In one embodiment, the second optical power detector 734 is connected to the output terminal of the high speed optical switch 731, the second optical power detector 734 is connected to the processor 732, and the processor 732 determines the connection status of the high speed optical switch with 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 may be understood as determining, by the processor 732, which route the high speed optical switch 731 is currently signaling.

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

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

In one example, the optical protection board 73 includes a 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, respectively, 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 with the first route 71 and the second route 72 according to the optical power 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 and is configured to control the FPGA and other devices in the optical protection board 73, such as the optical splitter 735.

In one example, the optical protection board 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, 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 with a second optical power detector 734, the second optical power detector 734 is connected with the FPGA, and the FPGA determines the connection state of the high-speed optical switch with 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 a connection state of the high-speed optical switch 731 with 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 and is configured to control the FPGA and other devices in the optical protection board 73.

In one example, the optical protection board 73 may be applied to a signal transmitting end and a signal receiving end. Therefore, the optical protection board 73 may include both a device for receiving signals and a device for transmitting signals.

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

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

Since the signal transmission is usually bidirectional, that is, there is signal transmission and signal feedback, the optical protection board 73 may include the optical splitter 735 and the high-speed optical switch 731 structure at the same time, and the lines of the two structures do not interfere with each other. That is, the optical protection board 73 can be used as a receiving end or a transmitting end.

Specifically, under the condition that the first service board card and the second service board card are included, the signal sent by the first service board card may be sent to the high-speed optical switch 731 of the optical protection board card 73 through each route, so that the high-speed optical switch 731 sends the signal of one route to the second service board card. 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. Under the condition that the optical protection board 73 is in the optical protection switching operating mode, two routes are respectively connected to one input end of the high-speed optical switch 731, the two routes are respectively connected to one first optical power detector 733, and the output end of the high-speed optical switch 731 is communicated with the service board 74.

When the optical protection board 73 is in the working mode of distributing signals, the uplink optical interface (input end) of the optical splitter 735 is communicated with the service board 74, and each downlink optical interface (output end) of the optical splitter 735 is communicated with each route.

In an application example, 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 side and the receiving side are defined according to the signal transmission direction, and a may be the receiving side and B may be the transmitting side.

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

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

The first optical protection board 92 and the second optical protection board 97 may be the optical protection devices of any of the above embodiments. The first service board card 91 and the second service board card 98 may be service terminals of any of the embodiments described above.

In a variable application example, as shown in fig. 10, the transmitting end includes a first service board 91, a first optical protection board 92, a first wavelength division multiplexer 93, and a first optical amplifier 94. The first service board card 91 is connected with a first wavelength division multiplexer 93, the first wavelength division multiplexer 93 is connected with a first optical protection board card 92, and the first optical protection board card 92 is respectively connected with the first optical fiber route and the second optical fiber route through optical splitters. First optical amplifiers 94 are disposed between the first optical protection board 92 and the first optical fiber route and between the first optical protection board 92 and the second optical fiber route.

The receiving end includes a second service board 98, a second optical protection board 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 to the input end of the high-speed optical switch of the second optical protection board 97. Second optical amplifiers 95 are disposed between the second optical protection board 97 and the first optical fiber route and between the second optical protection board 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.

The first optical protection board 92 and the second optical protection board 97 may be optical protection devices according to any of the above embodiments. The first service board 91 and the second service board 98 may be service terminals of any of the above embodiments.

In a variable application example, as shown in fig. 11, the transmitting end includes a first service board 91, a first optical protection board 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 the first optical fiber route i and the second optical fiber route ii through optical splitters.

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

The first optical protection board 92 and the second optical protection board 97 may be the optical protection devices of any of the above embodiments. The first service board 91 and the second service board 98 may be service terminals of any of the above embodiments.

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

s1: and the FPGA updates the optical power detection result stored in the register group corresponding to the route based on the obtained optical power detection result of the route. The register set is configured for the route 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 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 to continue signal transmission under the condition that the optical power of the route is determined to be lower than the threshold value.

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

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

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

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

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 of acquiring the optical power detection result of the first route, determining a target register in which the optical power detection result in the register group corresponding to the first route is stored earliest.

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

For example, the register group is composed of four registers of A, B, C and D. 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 the longest time of the optical power detection result stored in the register A according to the storage time of each optical power detection result in the register, namely the register A is the 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 destination register may be understood as overwriting the acquired optical power detection result of the first route with the optical power detection result already stored in the destination register, or may be understood as deleting the optical power detection result already stored in the destination register and storing the optical power detection result of the first route.

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

In a specific application example related to steps S50 and S51, the register group is composed of four registers a, B, C, and D. 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 the longest time of the optical power detection result stored in the register A according to the storage time of each optical power detection result in the register, namely the register A is the target register. Therefore, the acquired optical power detection result of the first route is updated into the register a.

s60: and under the condition of acquiring the optical power detection result of the first route, deleting the optical power detection result in the first register on the preset time node according to the time sequence of the optical power detection results stored in the registers.

For example, the register group is composed of four registers of A, B, C and D. 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, according to the sequence of storing the optical power detection result by each register from early to late, the first register is register a, the second register is register B, the third register is register C, and the fourth register is register D. Therefore, the optical power detection result stored in the register a (i.e., the first register at the predetermined time node) needs to be deleted.

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 group is composed of four registers of A, B, C and D. According to the sequence of storing the optical power detection result by each register from early to late, 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. Deleting the optical power detection result stored in the first register A, storing the optical power detection result stored in the register B into the previous register (namely, the register A), storing the optical power detection result stored in the register C into the previous register (namely, the register B), and storing the optical power detection result stored in the register D into the previous register (namely, the register C).

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

The last register may be understood as a register storing the optical power detection result last in an order from early to late.

For example, the register group is composed of four registers of A, B, C and D. 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 register D is used as the last register in the order of storing the optical power detection result from the early to the 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 updated optical power detection result stored in each register, and may further include:

and calculating an average value according to the updated optical power detection result stored in each register so as to determine the optical power of the first route.

In the disclosed technology, by means of hardware averaging, not only can the optical power of the first route be rapidly calculated, but also the accuracy and the reference value of the calculation result can be ensured.

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

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 phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be examples only, and are not meant to limit implementations of the disclosure described and/or claimed herein.

As shown in fig. 12, the electronic apparatus 1200 includes a computing unit 1201, which 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 the storage unit 12012 into a Random Access Memory (RAM) 1203. In the RAM 1203, various programs and data necessary for the operation of the electronic apparatus 1200 may also be stored. The computing unit 1201, the ROM 1202, and the RAM 1203 are connected to each other by a bus 1204. An input/output (I/O) interface 1205 is also connected to bus 1204.

A number of components in the electronic device 1200 are connected to the I/O interface 1205, including: an input unit 1206 such as a keyboard, a mouse, or the like; an output unit 1207 such as various types of displays, speakers, and the like; a storage unit 1208 such as a magnetic disk, 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 via a computer network such as the internet and/or various telecommunication networks.

Computing unit 1201 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of the 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, a Digital Signal Processor (DSP), and any suitable processor, controller, microcontroller, and so forth. The calculation unit 1201 performs the respective methods and processes described above, such as a signal processing method. For example, in some embodiments, the signal processing method may be implemented as a computer software program tangibly embodied in 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 ROM 1202 and/or the communication unit 1209. When the 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 circuitry, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), system on a 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 that are executable and/or interpretable on a programmable system including at least one programmable processor, which may be special or general purpose, receiving data and instructions from, and transmitting data and instructions to, a storage system, at least one input device, and at least one output device.

Program code for implementing the 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/acts specified in the flowchart and/or block diagram to be performed. 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. A 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 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 a pointing device (e.g., a mouse or a 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 can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form, including acoustic, speech, or tactile input.

The systems and techniques described here can be implemented in a computing system that includes a back-end 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 back-end, 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 clients and servers. A client and server are generally 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 understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present disclosure may be executed in parallel or sequentially or in different orders, and are not limited herein as long as the desired results of the technical solutions disclosed in the present disclosure can be achieved.

The above detailed description should not be construed as limiting the scope of the disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present disclosure should be included in the scope of protection of the present disclosure.

Claims

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

and compensating the phase difference between the transmitting optical signal carrier of the signal received from the target route and the receiving optical signal carrier of the signal received from the target route based on the pre-stored parameters determined before route switching, wherein the estimation of the phase adopts forward feedback and is converged based on a minimum mean square error algorithm.

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

and performing at least one signal recovery process of dispersion compensation, frequency offset compensation, clock recovery, frame synchronization and polarization demultiplexing on the signals received from the target route based on the pre-stored parameters determined before route switching.

3. The method of claim 2, wherein the pre-stored parameters include a pre-stored dispersion compensation amount;

the dispersion compensation of the signal received from the target route based on the pre-stored parameters determined before the route switching comprises:

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

4. The method of claim 2, wherein the pre-stored parameters comprise pre-stored signal frequency offset values;

the frequency offset compensation of the signal received from the target route based on the pre-stored parameters determined before the route switching includes:

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 a frequency offset difference between the center wavelength of a receiving laser inside the route switching previous moment and the center wavelength of a transmitting laser at a transmitting end;

and performing frequency offset compensation on the signal received from the target route according to the pre-stored signal frequency offset value.

5. The method of claim 2, wherein the pre-stored parameters comprise pre-stored clock frequency offset values;

the clock recovery of the signal received from the target route based on the pre-stored parameters determined before the route switching includes:

determining a pre-stored clock frequency offset value corresponding to the target route, wherein the pre-stored clock frequency offset value is obtained by the following operations: determining the transmission time of a signal sent by a sending end to a service board card through a route based on the length of the route, acquiring the clock frequency of the signal sent by the sending end, acquiring 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 of the current moment based on the clock frequency of the signal and the internal clock sampling frequency, and calculating the average value of all clock frequency offset values determined in a preset time period before route switching to obtain the pre-stored clock frequency offset value;

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

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

and the signal recovery module is used for compensating the phase difference between the transmitting optical signal carrier of the signal received from the target route and the receiving optical signal carrier of the signal received from the target route based on the pre-stored parameters determined before route switching, wherein the estimation of the phase adopts forward feedback and is converged based on a minimum mean square error algorithm.

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

8. The apparatus of claim 7, wherein the pre-stored parameters comprise pre-stored dispersion compensation amounts, the signal recovery module comprising:

the first determining submodule is used for determining the pre-stored dispersion compensation quantity corresponding to the target route, and 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 the dispersion compensation submodule is used for carrying out dispersion compensation on the signals received from the target route according to the pre-stored dispersion compensation amount.

9. The apparatus of claim 7, wherein the pre-stored parameters comprise pre-stored signal frequency offset values, the signal recovery module comprising:

the second determining submodule is used for 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 a receiving laser in the previous time of route switching and the center wavelength of a transmitting laser of a transmitting end;

10. The apparatus of claim 7, wherein the pre-stored parameters comprise pre-stored clock frequency offset values, the signal recovery module comprising:

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 obtained through the following operations: determining the transmission time of a signal sent by a sending end to a service board card through a route based on the length of the route, acquiring the clock frequency of the signal sent by the sending end, acquiring 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 of the current moment based on the clock frequency of the signal and the internal clock sampling frequency, and calculating the average value of all clock frequency offset values determined in a preset time period before route switching to obtain the pre-stored clock frequency offset value;

11. A signal processing system comprising:

at least two routes for transmitting signals;

a service card comprising a signal processing arrangement as claimed in any of claims 6 to 10, the signal processing arrangement being connected to an output of the high speed optical switch.

12. The signal processing system of claim 11, wherein a second optical power detector is connected to an output of the high-speed optical switch, the second optical power detector is connected to the processor, and the processor determines a connection status of the high-speed optical switch and the router 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

a memory communicatively coupled to the at least one processor; wherein, the first and the second end of the pipe are connected with each other,

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.