CN116781175A - Power adjustment method and device, electronic equipment and storage medium - Google Patents
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Abstract
The application discloses a power adjusting method, a device, electronic equipment and a storage medium, relates to the technical field of communication, and is used for solving the problem that a wavelength division system is poor in receiving power flatness due to stimulated Raman scattering SRS. The method comprises the following steps: acquiring an optical signal transmitted in an optical transmission link; starting from the last span of the optical transmission link, acquiring the input power of the optical signal which is not affected by SRS for each span, and taking the input power as the output power of the previous span under the influence of SRS; hereafter for the case of SRS influence: obtaining the input power of the previous span according to a first preset algorithm and the output power of the previous span; adjusting EDFA optical amplification parameters of the span erbium-doped optical transmission link amplifier, and adjusting the span input power to the previous span output power; adjusting EDFA optical amplification parameters until the optical signal-to-noise ratio of each span is adjusted to be corresponding to a preset signal-to-noise ratio; the first span input power is obtained and is taken as the target emitted light power.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a power adjustment method, a device, an electronic apparatus, and a storage medium.
Background
Before the device of the wavelength division system is used for business, the wavelength division system needs to be planned and designed, for example, the running environment of the wavelength division system is debugged, namely, the operation is started.
During the opening process, the problem of uneven received power caused by stimulated raman scattering (stimulated raman scattering, SRS) effect can be compensated by directly adjusting the target emitted optical power and the gain of the erbium-doped optical transmission link amplifier (erbium doped fiber amplifier, EDFA).
However, for the wavelength division system of the C+L wave band, up to 192 wave channels can be achieved, the configuration process is complex, the efficiency of adjusting the target emitted light power and the light emission parameters of the EDFA is low, and the operation and maintenance difficulty is increased.
In order to compensate for the problem of received power non-uniformity caused by stimulated raman scattering (stimulated raman scattering, SRS) effects during the opening process, the target emitted optical power and the erbium-doped fiber amplifier (erbium doped fiber amplifier, EDFA) gain can be directly adjusted.
However, for the wavelength division system of the C+L wave band, up to 192 wave channels can be achieved, the configuration process is complex, the efficiency of adjusting the target emitted light power and the light emission parameters of the EDFA is low, and the operation and maintenance difficulty is increased.
Disclosure of Invention
The application provides a power adjusting method, a device, electronic equipment and a storage medium, which are used for solving the problem of poor received power flatness of a receiving end of a wavelength division system caused by SRS effect.
In order to achieve the above purpose, the application adopts the following technical scheme:
in a first aspect, the present application provides a power adjustment method, including: acquiring an optical signal transmitted in an optical transmission link; the optical transmission link comprises at least one span; starting from the last span in at least one span, acquiring input power of an optical signal transmitted in the span under the influence of Stimulated Raman Scattering (SRS) effect for each span, and taking the input power as output power of the optical signal transmitted in the previous span of the span under the influence of the SRS effect; according to a first preset algorithm and the output power of the optical signal under the influence of the SRS effect when the optical signal is transmitted in the previous span, obtaining the input power of the optical signal under the influence of the SRS effect when the optical signal is transmitted in the previous span; under the influence of SRS effect, adjusting the optical amplification parameters of the EDFA corresponding to the span, and adjusting the input power under the influence of the SRS effect when transmitting the optical signal in the span to be the output power under the influence of the SRS effect when transmitting the optical signal in the former span; acquiring an optical signal to noise ratio corresponding to input power under the influence of SRS effect when an optical signal is transmitted in each span; adjusting the optical amplification parameters of the EDFAs corresponding to each span in at least one span, and respectively adjusting the optical signal-to-noise ratio corresponding to each span to be a corresponding preset signal-to-noise ratio; and acquiring the input power under the influence of the SRS effect when the optical signal is transmitted in the first span, and taking the input power under the influence of the SRS as the target transmitting optical power when the optical signal is transmitted in the first span.
Optionally, for each span, acquiring an optical signal to noise ratio corresponding to input power under the influence of SRS effect when the optical signal is transmitted in the span; acquiring a preset signal-to-noise ratio corresponding to each span according to a second preset algorithm and the optical signal-to-noise ratio corresponding to each span respectively; the minimum value of the sum of the preset signal to noise ratios corresponding to each span is larger than a preset power threshold, and the difference between the maximum value and the minimum value of the sum of the preset signal to noise ratios corresponding to each span is smaller than a preset difference.
Optionally, the optical amplification parameters of the EDFA include: gain and/or gain slope of the EDFA.
Optionally, the first preset algorithm is an SRS inversion formula, and the second preset algorithm is a gradient-increasing algorithm.
In a second aspect, the present application provides a power regulating device comprising:
the acquisition module is used for acquiring the optical signals transmitted in the optical transmission link; the optical transmission link comprises at least one span; starting from the last span in at least one span, acquiring input power of an optical signal transmitted in the span under the influence of Stimulated Raman Scattering (SRS) effect for each span, and taking the input power as output power of the optical signal transmitted in the previous span of the span under the influence of the SRS effect; and obtaining the input power of the optical signal under the influence of the SRS effect when the optical signal is transmitted in the previous span according to the first preset algorithm and the output power of the optical signal under the influence of the SRS effect when the optical signal is transmitted in the previous span.
The adjusting module is used for adjusting the optical amplification parameters of the EDFAs of the erbium-doped optical fiber amplifiers corresponding to the spans under the influence of the SRS effect, and adjusting the input power under the influence of the SRS effect when the optical signals are transmitted in the spans to be the output power under the influence of the SRS effect when the optical signals are transmitted in the previous span of the spans; acquiring an optical signal to noise ratio corresponding to input power under the influence of SRS effect when an optical signal is transmitted in each span; adjusting the optical amplification parameters of the EDFAs corresponding to each span in at least one span, and respectively adjusting the optical signal-to-noise ratio corresponding to each span to be a corresponding preset signal-to-noise ratio; and acquiring the input power under the influence of the SRS effect when the optical signal is transmitted in the first span, and taking the input power under the influence of the SRS as the target transmitting optical power when the optical signal is transmitted in the first span.
Optionally, the adjusting module is further configured to obtain, for each span, an optical signal-to-noise ratio corresponding to an input power under the influence of the SRS effect when the optical signal is transmitted in the span; acquiring a preset signal-to-noise ratio corresponding to each span according to a second preset algorithm and the optical signal-to-noise ratio corresponding to each span respectively; the minimum value of the sum of the preset signal to noise ratios corresponding to each span is larger than a preset power threshold, and the difference between the maximum value and the minimum value of the sum of the preset signal to noise ratios corresponding to each span is smaller than a preset difference.
In a third aspect, there is provided an electronic device comprising: a memory and a processor; the memory is used for storing computer execution instructions; when the electronic device is running, the processor executes the computer-executable instructions stored in the memory to cause the electronic device to perform the power adjustment method as in the first aspect and any implementation.
In a fourth aspect, there is provided a computer-readable storage medium comprising: the computer-readable storage medium comprises computer-executable instructions which, when run on a computer, cause the computer to perform the power adjustment method as in the first aspect and any implementation.
For a detailed description of the second to fourth aspects of the present application and various implementations thereof, reference may be made to the detailed description of the first aspect and various implementations thereof; moreover, the advantages of the second aspect to the fourth aspect and the various implementations thereof may be referred to for analysis of the advantages of the first aspect and the various implementations thereof, and will not be described here again.
These and other aspects of the application will be more readily apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a wavelength division system according to an embodiment of the present application;
fig. 2 is a schematic flow chart of a power adjustment method according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a power spectrum without the influence of stimulated Raman scattering effect according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a power spectrum affected by stimulated Raman scattering effect according to an embodiment of the present application;
fig. 5 is a schematic diagram of a power adjustment method according to an embodiment of the present application;
fig. 6 is a schematic diagram two of a power adjustment method according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a power adjustment device according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the description of the present application, "/" means "or" unless otherwise indicated, for example, A/B may mean A or B. "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. Furthermore, "at least one" means one or more, and "a plurality" means two or more. The terms "first," "second," and the like do not limit the number and order of execution, and the terms "first," "second," and the like do not necessarily differ. In the present application, the words "exemplary" or "such as" are used to mean serving as an example, instance, or illustration.
It should be noted that any embodiment or design described as "exemplary" or "for example" in this disclosure should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.
The wavelength bands commonly used in fiber optic communications include the C-band and the L-band, wherein the C-band typically transmits light in the wavelength range 1530nm to 1565nm. Because of the low loss of the C-band optical signal, the C-band is the most commonly used band and is widely used in metropolitan area networks, long distance, ultra long distance transmission, and undersea optical fiber cable systems.
The band spreading technology is to spread the available transmission bandwidth from outside the spectrum of the C band according to the dense wavelength division multiplexing (dense wavelength division multiplexing, DWDM) technology, and increase the number of channels of the co-fiber transmission to increase the single-fiber transmission capacity. In addition, on the basis of DWDM of the C wave band, the device manufacturer and the operator in China have dominant the expansion of the Super C wave band (C6T) in the last two years, the bandwidth of the Super C wave band can reach 6THz, and the Super C wave band is matched with a 200GQPSK scheme with an 80 wave 75GHz interval to fall to the ground.
The system for carrying out long-distance optical transmission link communication by utilizing the DWDM technology is a wavelength division system and comprises a transmitting end, an optical transmission link and a receiving end, wherein the wavelength division system of the C wave band is carried in an optical signal of the C wave band for transmission after modulating an original signal at the transmitting end, and the original signal is recovered at the receiving end. In the wavelength division system of the c+l band, the SRS effect may cause the optical power to shift from the short wave to the long wave, affect the received power of the receiving end of the wavelength division system, and destroy the flatness of the optical signal to noise ratio (optical signal noise ratio, OSNR) of the receiving end. If power adjustment is not performed, strong power transfer exists in the wavelength division system due to SRS effect, so that the single-wave power flatness index of the receiving end of the wavelength division system is seriously deteriorated, and the application requirement cannot be met. And, as the channel bandwidth expands, the transmission power becomes larger, and the span increases, the power transfer phenomenon due to the SRS effect becomes more remarkable.
In the related art, the problem of degradation of the OSNR at the receiving end caused by the optical power loss of the C-band due to the SRS effect in the transmission process of the wavelength division system of the c+l band can be alleviated by manually configuring the target emission optical powers of the C-band and the L-band and the optical amplification parameters of the EDFA.
However, since the number of channels increases after the wavelength division system is expanded from the C-band to the c+l-band, a maximum of 192 channels can be achieved according to the calculation of the channel frequency interval of 50GHz, and the configuration process is complex, which increases the difficulty of manually configuring the operation and maintenance.
In order to solve the above problems, an embodiment of the present application provides a power adjustment method, in which an optical signal transmitted in an optical transmission link is acquired; the optical transmission link comprises at least one span; starting from the last span in at least one span, acquiring input power of an optical signal transmitted in the span under the influence of Stimulated Raman Scattering (SRS) effect for each span, and taking the input power as output power of the optical signal transmitted in the previous span of the span under the influence of the SRS effect; according to a first preset algorithm and the output power of the optical signal under the influence of the SRS effect when the optical signal is transmitted in the previous span, obtaining the input power of the optical signal under the influence of the SRS effect when the optical signal is transmitted in the previous span; under the influence of SRS effect, adjusting EDFA optical release parameters corresponding to the spans, and adjusting the input power under the influence of the SRS effect when transmitting the optical signal in the spans to be the output power under the influence of the SRS effect when transmitting the optical signal in the previous span of the spans; acquiring an optical signal to noise ratio corresponding to input power under the influence of SRS effect when an optical signal is transmitted in each span; adjusting the optical amplification parameters of the EDFAs corresponding to each span in at least one span, and respectively adjusting the optical signal-to-noise ratio corresponding to each span to be a corresponding preset signal-to-noise ratio; and acquiring the input power under the influence of the SRS effect when the optical signal is transmitted in the first span, and taking the input power under the influence of the SRS as the target transmitting optical power when the optical signal is transmitted in the first span.
As can be seen from the foregoing, in the scheme of the embodiment of the present application, the input power of each span is sequentially adjusted from the last span in the optical transmission link, and by adjusting the optical amplification parameters of the EDFA corresponding to each span, the flat optical signal-to-noise ratio and the target emission optical power are finally obtained, and on the basis of alleviating the poor receiving power flatness of the receiving end of the wavelength division system in the c+l band caused by the SRS effect, the efficiency of adjusting the target emission optical power is improved.
The method provided by the embodiment of the application can be applied to a wavelength division system shown in fig. 1, wherein the wavelength division system comprises a wavelength division platform 101 and a power adjusting device 102, and the wavelength division platform 101 and the power adjusting device 102 are connected through a logic interface.
The wavelength division platform 101 operates in the c+l band and includes a transmitting end, an optical transmission link, and a receiving end.
The transmitting end is used for converging at least two optical carrier signals with different wavelengths through the multiplexer and coupling the optical carrier signals into one optical fiber for transmission. The receiving end is used for separating the optical carriers of the mixed wavelengths through a demultiplexer and then is further processed by an optical receiver to recover the original signal.
The optical fiber transmission link comprises at least one span, each span comprises an optical fiber and an EDFA, one end of a first span in the at least one span is connected with a transmitting end, one end of a last span in the at least one span is connected with a receiving end, other spans except the first span and the last span in the at least one span are connected with two intermediate sites in the optical transmission link, and the intermediate sites are devices playing a role in relaying in the optical transmission link.
In some embodiments, the power adjustment device 102 may be a device for performing power adjustment on a target emitted light power of a transmitting end of the wavelength division platform 101.
The power adjustment device 102 may obtain, for each span, input power of an optical signal transmitted in the span that is not under the influence of the stimulated raman scattering SRS effect, from a last span of the optical transmission link, and use the input power as output power of the optical signal transmitted in a previous span of the span under the influence of the SRS effect; according to a first preset algorithm and the output power of the optical signal under the influence of the SRS effect when the optical signal is transmitted in the previous span, obtaining the input power of the optical signal under the influence of the SRS effect when the optical signal is transmitted in the previous span; under the influence of SRS effect, adjusting the optical amplification parameters of the EDFAs corresponding to the spans, and adjusting the input power under the influence of the SRS effect when transmitting the optical signals in the spans to be the output power under the influence of the SRS effect when transmitting the optical signals in the previous spans of the spans; acquiring an optical signal to noise ratio corresponding to input power under the influence of SRS effect when an optical signal is transmitted in each span; adjusting the optical amplification parameters of the EDFAs corresponding to each span in at least one span, and respectively adjusting the optical signal-to-noise ratio corresponding to each span to be a corresponding preset signal-to-noise ratio; and acquiring the input power under the influence of the SRS effect when the optical signal is transmitted in the first span, and taking the input power under the influence of the SRS as the target transmitting optical power when the optical signal is transmitted in the first span.
In some embodiments, the power adjustment device 102 may also be a system for dynamically simulating the entity object, namely the wavelength division platform 101, for simulating and evaluating the power adjustment method under the condition that other parameters are fixed. Other parameters include noise power and bandwidth, fiber length, attenuation, and nonlinear coefficients of each span, among others.
The power adjustment device 102 can simulate the condition of the optical transmission link affected by the SRS effect and the condition of the optical transmission link not affected by the SR S effect, and by providing operation maintenance, system prediction, improved flow, etc. for the wavelength division platform 101, the wavelength division platform can be improved to shorten the operation maintenance period, and the cost of implementation or maintenance can be reduced.
In some embodiments, with continued reference to fig. 1, the power conditioning device 102 may include a data module and a conditioning module.
The data module is configured to obtain target data from the wavelength division platform 101, where the target data includes input power, output power, optical signal to noise ratio, EDFA optical amplification parameters, noise coefficient, optical fiber length, nonlinear coefficient, attenuation, and the like of each span included in an optical transmission link of the wavelength division platform.
The adjusting module is used for calculating the optical amplification parameters and the target emission optical power of the EDFA, for example, the adjusting module can calculate the optical signal-to-noise ratio of each span based on a local optimal approximation global optimal algorithm and a gradient ascending algorithm, and calculate the optical amplification parameters and the target emission optical power of the EDFA.
In some embodiments, the wavelength division system may further include a display platform for providing a graphical interface to a user for interaction with the user, for example: issuing a task start instruction to the power adjustment device 102 in response to an operation by the user, presenting an evaluation result to the user, and the like.
As can be seen from the foregoing, in the scheme of the embodiment of the present application, the input power of each span is sequentially adjusted from the last span in the optical transmission link, and by adjusting the optical amplification parameters of the EDFA corresponding to each span, the flat optical signal-to-noise ratio and the target emission optical power are finally obtained, and on the basis of alleviating the poor receiving power flatness of the receiving end of the wavelength division system in the c+l band caused by the SRS effect, the efficiency of adjusting the target emission optical power is improved.
The embodiment of the application provides a power adjusting method. The method can be applied to electronic equipment with computing and processing capabilities, such as a twin platform, a server, a host computer and the like. Taking the application of the method to a twin platform as an example, referring to fig. 2, the method includes the following steps S201 to S206.
S201, acquiring an optical signal transmitted in an optical transmission link.
In some embodiments, the power conditioning device obtains the optical signals of the combined wavelength band transmitted in the optical transmission link from the wavelength division platform. The optical transmission link is used for transmitting unidirectional combined wave band optical signals at a long distance and is connected with the transmitting end and the receiving end of the wavelength division system; the optical transmission link comprises at least one span, wherein the span connected with the transmitting end is the first span, the span connected with the receiving end is the last span, and each span comprises an EDFA and an optical fiber.
Starting from the last span of the optical transmission link, calculating the input power of each span in turn, executing steps S202-S204, and executing S205 when calculating the input power of the first span.
S202, acquiring input power of an optical signal transmitted in a span which is not affected by SRS effect, and taking the input power as output power of the optical signal transmitted in the previous span of the span which is affected by SRS effect.
The stimulated raman scattering SRS effect is a nonlinear optical effect, and when an optical signal of a combined band is transmitted in an optical transmission link, the optical power of a short wavelength optical signal is reduced and the optical power of a long wavelength optical signal is amplified under the influence of the SRS effect, and therefore, the optical power of the short wavelength optical signal is shifted to the optical power of the long wavelength optical signal.
Exemplary, FIG. 3 is a power spectrum of an optical signal not affected by SRS effect, FIG. 4 is a power spectrum of an optical signal affected by SRS effect, wherein the horizontal axis of FIGS. 3 and 4 is frequency f, the vertical axis is power P, and the bandwidth is f 0 。
For example, starting from the last span in the optical transmission link, that is, from the span connected to the receiving end of the wavelength division system, as shown in fig. 5, the input power pin_n of the optical signal transmitted in the span n, which is not under the influence of the stimulated raman scattering SRS effect, may be obtained from the span n, and the pin_n is taken as the output power psrs_out_n-1 of the optical signal transmitted in the span n-1, which is under the influence of the SRS effect.
Optionally, the wavelength division platform gives the target data respectively contained in the scene without the SRS effect and the scene with the SRS effect. The power adjusting device collects the input power and the output power of each span corresponding to the two scenes respectively. The target data, except for the input power, output power, optical discharge coefficient of the EDFA and OSNR of each span, is fixed. The target data comprises input power, output power, optical signal to noise ratio, EDFA optical amplification parameters, noise coefficients, optical transmission link length, nonlinear coefficients, attenuation and the like of each span included in the optical transmission link of the wavelength division platform.
S203, according to a first preset algorithm and the output power under the influence of the SRS effect when the optical signal is transmitted in the previous span, obtaining the input power under the influence of the SRS effect when the optical signal is transmitted in the previous span.
For example, referring to fig. 5, the output power under the influence of SRS effect may be psrs_out_n-1 when the optical signal is transmitted in the previous span. Based on psrs_out_n-1, the input power psrs_in_n-1 under the influence of SRS effect when the optical signal is transmitted in the previous span can be obtained.
In some embodiments, the first preset algorithm may be an SRS inversion formula shown in formula (1).
In the above formula (1), z is the transmission distance of the optical signal in the optical transmission link, n is the number of the channel, ω n For the frequency, ω, of the optical signal corresponding to channel n m For the frequency of the optical signal corresponding to channel m, A eff An effective cross-sectional area of an optical fiber in an optical transmission link, alpha is an attenuation coefficient of the optical fiber in the optical transmission link, g R Is the raman gain coefficient. P (P) n (z) represents the output power of the optical signal corresponding to channel n through the optical fiber in the optical transmission link of length z under the influence of SRS effect, so that P corresponds to z=0 n (0) Is the input power of the optical signal before passing through the optical fiber of the z-optical transmission link of length.
S204, under the influence of SRS effect, adjusting the optical amplification parameters of the EDFAs corresponding to the spans, and adjusting the input power under the influence of the SRS effect when the optical signals are transmitted in the spans to be the output power under the influence of the SRS effect when the optical signals are transmitted in the previous spans of the spans.
For example, with continued reference to fig. 5, span n is the span closest to the receiving end, and when an optical signal is transmitted in span n under the influence of SRS effect, by adjusting the optical amplification parameters of the EDFA corresponding to span n, the input power psrs_in_n of the optical signal under the influence of SRS effect can be adjusted to the value of the input power psrs_out_n-1 under the influence of SRS effect when the optical signal is transmitted in span n-1.
In order to ensure the continuity of the input power and the output power between each adjacent span in the optical transmission link, the input power psrs_in_n of the optical signal under the influence of the SRS effect can be adjusted to be the value of the input power psrs_out_n-1 under the influence of the SRS effect when the optical signal is transmitted in the span n-1.
Thereafter, the input power Psrs_in_n-2 of the previous span n-2 of the span n-1 may be adjusted. And repeating steps S202-S204, and sequentially adjusting the input power of each span from back to front in the optical transmission link. And until the span 2 is calculated, acquiring the input power Pin_2 of the optical signal transmitted in the span 2, which is not influenced by the stimulated Raman scattering SRS effect. Wherein span 2 is the next span of span 1, span 1 is the span nearest to the transmitting end. And taking the value of Pin_2 as the output power Psrs_out_1 of the optical signal transmitted in the span 1 under the influence of the SRS effect, and obtaining the input power Psrs_in_1 of the optical signal under the influence of the SRS effect according to the Psrs_out_1 and a first preset algorithm, thereby obtaining the input power of the optical signal under the influence of the SRS effect when the optical signal is transmitted in each span.
S205, acquiring an optical signal to noise ratio corresponding to input power under the influence of SRS effect when an optical signal is transmitted in each span; and adjusting the optical amplification parameters of the EDFAs corresponding to each span in at least one span, and respectively adjusting the optical signal to noise ratio corresponding to each span to be a corresponding preset signal to noise ratio.
In some embodiments, when an optical signal is transmitted in each span, an optical signal-to-noise ratio corresponding to an input power under the influence of an SRS effect is obtained, and by adjusting a gain and/or a gain slope of an EDFA corresponding to each span, a corresponding output power can be changed, so that the optical signal-to-noise ratio corresponding to each span can be respectively adjusted to a corresponding preset signal-to-noise ratio.
In some embodiments, the preset signal-to-noise ratio may be obtained by:
for each span, acquiring an optical signal to noise ratio corresponding to input power under the influence of SRS effect when an optical signal is transmitted in the span; according to a second preset algorithm and the optical signal to noise ratio corresponding to each span, taking the optical signal to noise ratio corresponding to the input power under the influence of the SRS effect at present as an initial value, and then iterating until the output signal to noise ratio of the optical transmission link reaches the maximum, and acquiring the preset signal to noise ratio corresponding to each span; and the minimum value of the sum of the preset signal to noise ratios corresponding to each span is larger than a preset power threshold, and the difference between the maximum value and the minimum value of the sum of the preset signal to noise ratios corresponding to each span is smaller than a preset difference. The second preset algorithm may be a gradient-increasing algorithm.
In the above embodiment, the target data is obtained from the wavelength division system, where the target data includes a transmission length of each span, attenuation of the optical transmission link, a nonlinear coefficient, a reference power, a total transmission bandwidth, a noise coefficient, and the like, and by adjusting the EDFA optical amplification parameters corresponding to each span, the beneficial effect of optimizing the output signal-to-noise ratio of each span can be achieved.
In addition, since power transfer of short wavelength from output power to long wavelength occurs for each span compared to input power under the influence of SRS effect, and such power transfer has span accumulation effect. In the embodiment of the present invention, as shown in fig. 6, for each span, the optical amplification parameters of the EDFA corresponding to each span are adjusted to adjust the slope of the output power spectrum corresponding to each span, so that the power spectrum inclined under the influence of the SRS effect can be flattened again, and compared with the output power flattening of each span before power adjustment, the optical signal-to-noise ratio and the output power are improved in a positive correlation relationship, and under the condition that the target data corresponding to each span is unchanged, the flatness of the optical signal-to-noise ratio is improved, so that the flatness of the output optical signal-to-noise ratio of the optical transmission link is optimized, that is, the flatness of the optical signal-to-noise ratio of the receiving end of the wavelength division system is optimized. Wherein the target data includes transmission length of each span, fiber attenuation, nonlinear coefficients, noise reference power, total bandwidth transmitted, noise coefficients, etc.
S206, acquiring input power under the influence of SRS effect when the optical signal is transmitted in the first span, and taking the input power under the influence of SRS as target transmitting optical power when the optical signal is transmitted in the first span.
In some embodiments, an input power of the optical signal under the influence of the SRS effect is obtained when the optical signal is transmitted in the first span, where the value of the input power is the target transmission optical power of the wavelength division system.
As can be seen from the foregoing, in the scheme of the embodiment of the present application, the input power of each span is sequentially adjusted from the last span in the optical transmission link, and by adjusting the optical amplification parameters of the EDFA corresponding to each span, the flat optical signal-to-noise ratio and the target emission optical power are finally obtained, and on the basis of alleviating the poor receiving power flatness of the receiving end of the wavelength division system in the c+l band caused by the SRS effect, the efficiency of adjusting the target emission optical power is improved.
Based on a local optimal approximation global optimal algorithm (LOGO), SRS effect is considered, transmission length, reference input power, total transmission bandwidth, noise coefficient spectrum and the like of each span are taken as input, and the input power spectrum of each span is changed by configuring the gain and gain slope of an optical amplifier of each span in a link, so that the optimization of the OSNR of a receiving end is realized, the OSNR is as flat as possible, and rapid and accurate power adjustment can be realized. On one hand, the power balance between each wave channel in the C wave band and the L wave band is ensured by using an achievable modeling method; on the other hand, the configuration scheme which enables the performance of the wavelength division system to be optimal can be rapidly and accurately given, the system performance is ensured to be stable, operation and maintenance means are simplified, the method can be used for the optical transmission technology of band expansion, has important significance for the network construction of the wavelength division platform, and can also provide effective guidance in the application of a long-distance high-speed transmission system.
The embodiment of the application also provides a power adjusting device, which is shown in fig. 7 and comprises an acquisition module 701 and an adjusting module 702.
An acquisition module 701, configured to acquire an optical signal transmitted in an optical transmission link; the optical transmission link comprises at least one span; starting from the last span in at least one span, acquiring input power of an optical signal transmitted in the span under the influence of Stimulated Raman Scattering (SRS) effect for each span, and taking the input power as output power of the optical signal transmitted in the previous span of the span under the influence of the SRS effect; and obtaining the input power of the optical signal under the influence of the SRS effect when the optical signal is transmitted in the previous span according to the first preset algorithm and the output power of the optical signal under the influence of the SRS effect when the optical signal is transmitted in the previous span.
The adjusting module 702 is configured to adjust, under the influence of the SRS effect, an optical amplification parameter of the EDFA corresponding to the span, and adjust, when an optical signal is transmitted in the span, an input power under the influence of the SRS effect to an output power under the influence of the SRS effect when the optical signal is transmitted in a preceding span of the span; acquiring an optical signal to noise ratio corresponding to input power under the influence of SRS effect when an optical signal is transmitted in each span; adjusting the optical amplification parameters of the EDFAs corresponding to each span in at least one span, and respectively adjusting the optical signal-to-noise ratio corresponding to each span to be a corresponding preset signal-to-noise ratio; and acquiring the input power under the influence of the SRS effect when the optical signal is transmitted in the first span, and taking the input power under the influence of the SRS as the target transmitting optical power when the optical signal is transmitted in the first span.
The adjusting module 702 is further configured to obtain, for each span, an optical signal-to-noise ratio corresponding to an input power under the influence of the SRS effect when the optical signal is transmitted in the span; acquiring a preset signal-to-noise ratio corresponding to each span according to a second preset algorithm and the optical signal-to-noise ratio corresponding to each span respectively; the minimum value of the sum of the preset signal to noise ratios corresponding to each span is larger than a preset power threshold, and the difference between the maximum value and the minimum value of the sum of the preset signal to noise ratios corresponding to each span is smaller than a preset difference.
When the power adjustment method in the embodiment of the application is realized, on one hand, the power transfer problem caused by SRS effect influence in a C+L wave band wavelength division system is improved, and the receiving power flatness of a receiving end is improved by adjusting the optical amplification parameters of the EDFAs corresponding to each span for multiple times. Since the wavelength range of the C band is 1530-1565 nm and the wavelength range of the L band is 1565-1625 nm, the C band is more seriously affected by SRS effect than the L band, and the embodiment of the application has different effects on the transmission of the optical signals of the C band and the L band in a wavelength division system: for the C wave band, as the OSNR and the received power are in positive correlation, the OSNR at the short wavelength in the C wave band is also improved; for the L wave band, the target emitted light power can be obviously reduced on the premise of ensuring that the OSNR of the receiving end is not basically affected, so that the nonlinear cost is kept at a small level. In summary, the embodiment of the application improves the problems of poor received power flatness and poor OSNR flatness caused by the influence of SRS effect on the c+l band wavelength division system by optimizing the target emitted light power, and provides effective guidance for the band-spread light transmission technology in the long-distance high-speed system application.
On the other hand, as the wavelength division system of the C+L band can reach 192 channels at most, for the prior art, the efficiency of adjusting the target emission optical power and the optical amplification parameters of the EDFA is lower, the configuration process is complex, and compared with the traditional method for adjusting the optical power of all channels contained in the optical signal, the method for adjusting the optical power of the target emission optical power provided by the embodiment of the application has higher efficiency.
The foregoing description of the solution provided by the embodiments of the present application has been mainly presented in terms of a method. To achieve the above functions, it includes corresponding hardware structures and/or software modules that perform the respective functions. Those of skill in the art will readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The embodiment of the application can divide the functional modules of the communication device according to the method example, for example, each functional module can be divided corresponding to each function, or two or more functions can be integrated in one processing module. The integrated modules may be implemented in hardware or in software functional modules. Optionally, the division of the modules in the embodiment of the present application is schematic, which is merely a logic function division, and other division manners may be implemented in practice.
Fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present application, as shown in fig. 8, where the electronic device includes: a processor 801, a memory 802. Optionally, the electronic device may also include a bus 804; optionally, the electronic device may also include a communication interface 803. The processor 801 may be a variety of exemplary logic blocks, modules, and circuits that implement or perform the description of the various embodiments described in connection with the present disclosure. The processor 801 may be a central processor, general purpose processor, digital signal processor, application specific integrated circuit, field programmable gate array or other programmable logic device, transistor logic device, hardware components, or any combination thereof. Which may implement or perform the various exemplary logic blocks, modules and circuits described in connection with this disclosure. The processor 801 may also be a combination of computing functions, e.g., including one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc. A communication interface 803 for connecting with other devices through a communication network. The communication network may be an ethernet, a radio access network, a wireless local area network (wireless local area networks, WLAN), etc. Memory 802, which may be, but is not limited to, a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (random access memory, RAM) or other type of dynamic storage device that can store information and instructions, or an electrically erasable programmable read-only memory (electrically erasable programmable, read-only memory, EEPRO M), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. As a possible implementation, the memory 802 may exist separately from the processor 801, and the memory 802 may be connected to the processor 801 through a bus 804 for storing instructions or program code. The processor 801, when calling and executing instructions or program code stored in the memory 802, is capable of implementing the power adjustment method provided by the embodiments of the present application. In another possible implementation, the memory 802 may also be integrated with the processor 801 on a bus 804, which may be an extended industry standard architecture (eisa) bus or the like. The bus 804 may be classified as an address bus, a data bus, a control bus, or the like. For ease of illustration, only one thick line is shown in fig. 8, but not only one bus or one type of bus.
Some embodiments of the application provide a computer readable storage medium (e.g., a non-transitory computer readable storage medium) having stored therein computer program instructions which, when run on a computer, cause the computer to perform a method as in any of the embodiments described above.
By way of example, the computer-readable storage media described above can include, but are not limited to: magnetic storage devices (e.g., hard Disk, floppy Disk or tape, etc.), optical disks (e.g., compact Disk (23 CD), digital versatile Disk (Digital Versatile Disk, DVD), etc.), smart cards, and flash memory devices (e.g., electrically erasable programmabl e read-only memory (EEPROM), cards, sticks, or key drives, etc.). Various computer-readable storage media described in this disclosure may represent one or more devices and/or other machine-readable storage media for storing information. The term "machine-readable storage medium" can include, without being limited to, wireless channels and various other media capable of storing, containing, and/or carrying instruction(s) and/or data.
Embodiments of the present application provide a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of any of the above embodiments.
The foregoing is merely illustrative of specific embodiments of the present application, and the scope of the present application is not limited thereto, but any changes or substitutions within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims (8)
1. A method of power regulation, the method comprising:
acquiring an optical signal transmitted in an optical transmission link; the optical transmission link comprises at least one span;
starting from the last span in the at least one span, acquiring, for each span, input power of the optical signal transmitted in the span, which is not under the influence of Stimulated Raman Scattering (SRS) effect, and taking the input power as output power of the optical signal transmitted in the previous span of the span, which is under the influence of the SRS effect;
obtaining input power of the optical signal under the influence of the SRS effect when the optical signal is transmitted in the previous span according to a first preset algorithm and the output power of the optical signal under the influence of the SRS effect when the optical signal is transmitted in the previous span;
Under the influence of the SRS effect, adjusting the optical amplification parameters of the EDFA corresponding to the span, and adjusting the input power under the influence of the SRS effect when the optical signal is transmitted in the span to be the output power under the influence of the SRS effect when the optical signal is transmitted in the previous span of the span;
acquiring an optical signal to noise ratio corresponding to input power under the influence of the SRS effect when the optical signal is transmitted in each span;
adjusting the optical amplification parameters of the EDFAs corresponding to each span in the at least one span, and respectively adjusting the optical signal-to-noise ratio corresponding to each span to be a corresponding preset signal-to-noise ratio;
and acquiring the input power of the optical signal under the influence of the SRS effect when the optical signal is transmitted in the first span, and taking the input power of the optical signal under the influence of the SRS as the target transmitting optical power when the optical signal is transmitted in the first span.
2. The method according to claim 1, comprising, before said adjusting the osnr of each span to a corresponding preset osnr, respectively:
for each span, acquiring an optical signal to noise ratio corresponding to input power under the influence of the SRS effect when the optical signal is transmitted in the span;
Acquiring a preset signal-to-noise ratio corresponding to each span according to a second preset algorithm and the optical signal-to-noise ratio corresponding to each span respectively; the minimum value of the sum of the preset signal to noise ratios corresponding to each span is larger than a preset power threshold, and the difference between the maximum value and the minimum value of the sum of the preset signal to noise ratios corresponding to each span is smaller than a preset difference.
3. The method of claim 1, wherein the optical amplification parameters of the erbium doped fiber amplifier, EDFA, comprise: the gain and/or gain slope of the EDFA.
4. The method of claim 2, wherein the first predetermined algorithm is an SRS inversion formula and the second predetermined algorithm is a gradient-increasing algorithm.
5. A power conditioning apparatus, comprising:
the acquisition module is used for acquiring the optical signals transmitted in the optical transmission link; the optical transmission link comprises at least one span; starting from the last span in the at least one span, acquiring, for each span, input power of the optical signal transmitted in the span, which is not under the influence of Stimulated Raman Scattering (SRS) effect, and taking the input power as output power of the optical signal transmitted in the previous span of the span, which is under the influence of the SRS effect; obtaining input power of the optical signal under the influence of the SRS effect when the optical signal is transmitted in the previous span according to a first preset algorithm and the output power of the optical signal under the influence of the SRS effect when the optical signal is transmitted in the previous span;
The adjusting module is used for adjusting the optical amplification parameters of the erbium-doped fiber amplifier EDFA corresponding to the span under the influence of the SRS effect, and adjusting the input power under the influence of the SRS effect when the optical signal is transmitted in the span to be the output power under the influence of the SRS effect when the optical signal is transmitted in the previous span of the span; acquiring an optical signal to noise ratio corresponding to input power under the influence of the SRS effect when the optical signal is transmitted in each span; adjusting the optical amplification parameters of the EDFAs corresponding to each span in the at least one span, and respectively adjusting the optical signal-to-noise ratio corresponding to each span to be a corresponding preset signal-to-noise ratio; and acquiring the input power of the optical signal under the influence of the SRS effect when the optical signal is transmitted in the first span, and taking the input power of the optical signal under the influence of the SRS as the target transmitting optical power when the optical signal is transmitted in the first span.
6. The power conditioning apparatus of claim 5, wherein,
the adjusting module is further configured to obtain, for each span, an optical signal-to-noise ratio corresponding to an input power under the influence of the SRS effect when the optical signal is transmitted in the span; acquiring a preset signal-to-noise ratio corresponding to each span according to a second preset algorithm and the optical signal-to-noise ratio corresponding to each span respectively; the minimum value of the sum of the preset signal to noise ratios corresponding to each span is larger than a preset power threshold, and the difference between the maximum value and the minimum value of the sum of the preset signal to noise ratios corresponding to each span is smaller than a preset difference.
7. An electronic device comprising a memory and a processor; the memory is used for storing computer execution instructions; when the electronic device is running, the processor executes the computer-executable instructions stored in the memory to cause the electronic device to perform the power adjustment method of any one of claims 1-4.
8. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a computer program which, when executed by a processor, implements the power adjustment method of any of claims 1-4.
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