CN113497666B

CN113497666B - Optical signal compensation device, method, apparatus, and computer-readable storage medium

Info

Publication number: CN113497666B
Application number: CN202010261501.0A
Authority: CN
Inventors: 罗俊; 李杨
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-04-03
Filing date: 2020-04-03
Publication date: 2022-09-23
Anticipated expiration: 2040-04-03
Also published as: CN113497666A; WO2021197252A1

Abstract

The application discloses an optical signal compensation device, method, equipment and computer readable storage medium, belonging to the technical field of optical transmission. The device determines a plurality of first gain values corresponding to a plurality of wavelengths of an optical signal transmitted in the next span optical fiber through the controller according to a first power detection value and a second power detection value detected by the power detection unit, and issues a target control instruction to the optical amplifier.

Description

Optical signal compensation device, method, apparatus, and computer-readable storage medium

Technical Field

The present application relates to the field of optical transmission technologies, and in particular, to an optical signal compensation apparatus, method, device, and computer readable storage medium.

Background

In order to avoid spectral tilt caused by raman effect when optical signals are transmitted in optical fibers, optical amplifiers may be used to compensate the optical signals.

Currently, the gain value of the optical amplifier can be controlled by an optical channel power detector (OCM) and a controller in fig. 1 to compensate for the spectrum tilt of the optical signal due to the raman effect, where fig. 1 is a schematic diagram of an optical signal compensation method provided in this embodiment of the present application. In fig. 1, an optical splitter splits an optical signal emitted from an optical amplifier into two parts and emits a part of the optical signal to an optical fiber so that the part of the optical signal can be transmitted through the optical fiber, and the optical splitter emits another part of the optical signal to an OCM, the OCM can detect optical powers of light beams of respective wavelengths in the input optical signal and generate the optical powers of the light beams of the respective wavelengths to a controller, the controller predicts raman gain values generated when the light beams of the respective wavelengths are transmitted through the optical fiber according to the optical powers of the light beams of the respective wavelengths, and for a light beam of any one wavelength, the controller controls an amplification gain value of the optical amplifier to be opposite to a raman gain value corresponding to the wavelength so as to compensate for an influence caused by a raman effect when the light beam of the wavelength is transmitted through the optical fiber.

However, the wavelength distribution of the optical signal transmitted in the optical fiber in the wavelength division multiplexing system may change dynamically, for example, as shown in fig. 2, which is a schematic view of a wavelength division multiplexing system provided in this embodiment of the present application, a reconfigurable optical add-drop multiplexer (ROADM) in fig. 2 may down-wave a part of the wavelength light beam in the received optical signal to an optical receiver of a local node, and emit the remaining wavelength light beam in the received optical signal to the optical fiber, that is, a down-wave phenomenon occurs, so that the optical signal transmitted in the optical fiber lacks a part of the wavelength light beam, and the wavelength distribution of the optical signal transmitted in the optical fiber changes dynamically; or, the optical transmitter of the local node may also transmit optical beams with other wavelengths to the ROADM, and the ROADM may combine the optical beams with other wavelengths transmitted by the optical transmitter and the received optical signal into a new optical signal and transmit the new optical signal to the optical fiber, that is, an upwave phenomenon occurs, and at this time, the new optical signal is transmitted in the optical fiber, and the wavelength distribution of the optical signal transmitted in the optical fiber is dynamically changed due to the addition of the optical beams with other wavelengths in the new optical signal.

The time dimension of the dynamic change of the wavelength distribution of the optical signal transmitted in the optical fiber is generally in the millisecond level, the OCM performs scanning power detection on the input optical signal according to the wavelength, and the detection period is generally in the second level, therefore, in the process of detecting a part of the optical signal of a certain optical signal output by the optical amplifier, the optical signal received by the optical amplifier may have been changed into a new optical signal by a certain optical signal (old optical signal), and the controller determines the amplification gain value for compensating the old optical signal based on the detection result of the OCM, so that the controller controls the optical amplifier to compensate the new optical signal based on the amplification gain value for compensating the old optical signal, which not only causes the old optical signal not to be compensated in time, but also causes the new optical signal not to be correctly compensated. That is, the optical amplifier cannot compensate the received optical signal in real time based on the detection result of the OCM.

Disclosure of Invention

The embodiment of the application provides an optical signal compensation device, an optical signal compensation method, optical signal compensation equipment and a computer-readable storage medium, which can compensate optical signals in real time. The technical scheme is as follows:

in a first aspect, an optical signal compensation apparatus is provided, the apparatus includes an optical amplifier, an optical splitter, a power detection unit, and a controller; the connection relationship among the optical amplifier, the optical splitter, the power detection unit and the controller may be as follows: the optical amplifier is connected with the optical splitter and the controller, the optical splitter is connected with the power detection unit, and the power detection unit is connected with the controller;

the optical splitter is configured to split a target optical signal transmitted by the optical amplifier to obtain a first optical signal, a second optical signal, and a third optical signal, transmit the first optical signal to a next span optical fiber, and transmit the second optical signal and the third optical signal to the power detection unit;

the power detection unit is configured to perform power detection on the second optical signal and the third optical signal, and send target power information carrying a first power detection value and a second power detection value to the controller;

the controller is configured to determine, according to the first power detection value and the second power detection value carried in the target power information, a plurality of first gain values corresponding to a plurality of wavelengths of an optical signal transmitted in the next span optical fiber, and send a target control instruction to the optical amplifier;

the optical amplifier is configured to receive a fourth optical signal output by a last cross optical fiber, amplify the fourth optical signal according to the plurality of first gain values in the target control instruction to obtain a fifth optical signal, and transmit the fifth optical signal to the optical splitter;

the target optical signal includes optical beams with multiple wavelengths, the next-span optical fiber is configured to transmit an optical signal output by the apparatus, the first power detection value is detected optical power of the second optical signal, the second power detection value is detected optical power filtered by the third optical signal, the target control command includes multiple first gain values, the multiple first gain values are in one-to-one correspondence with the wavelengths of the optical signals transmitted through the next-span optical fiber, and the previous-span optical fiber is configured to output the optical signal to the apparatus.

The device determines a plurality of first gain values corresponding to a plurality of wavelengths of an optical signal transmitted in the next span optical fiber through a controller according to a first power detection value and a second power detection value detected by a power detection unit, and issues a target control command to an optical amplifier.

In a possible implementation manner, the target power information includes first power information and second power information, where the first power information carries the first power detection value, and the second power information carries the second power detection value;

the power detection unit comprises a first power detector, a filter and a second power detector; the first power detector is connected with the optical splitter and the controller, the filter is connected with the optical splitter and the second power detector, and the second power detector is connected with the controller;

the first power detector is configured to perform power detection on the second optical signal transmitted by the optical splitter to obtain the first power detection value, and send the first power information to the controller;

the filter is configured to perform linear filtering on the third optical signal transmitted by the optical splitter to obtain a filtered signal, and transmit the filtered signal to the second power detector;

the second power detector is configured to perform power detection on the filtered signal to obtain a second power detection value, and send the second power information to the controller.

In one possible implementation, the controller is configured to;

determining the optical power of the target optical signal and the optical power of the target optical signal after filtering based on the first power detection value and the second power detection value carried by the target power information; and determining the plurality of first gain values according to the optical power of the target optical signal and the optical power of the target optical signal after filtering.

In one possible implementation, the controller is configured to:

determining a plurality of Raman gain values corresponding to the plurality of wavelengths according to the optical power of the target optical signal, the optical power of the target optical signal after filtering and the length of the next span optical fiber; determining a plurality of first gain values corresponding to the plurality of wavelengths according to a plurality of Raman gain values corresponding to the plurality of wavelengths;

the plurality of raman gain values are gains generated by raman effect when the light beams with the plurality of wavelengths are transmitted in the next span of optical fiber, and the plurality of raman gain values correspond to the wavelengths of the optical signals transmitted in the next span of optical fiber in a one-to-one mode.

In a second aspect, an optical signal compensation apparatus is provided, the apparatus comprising a compensation unit, an optical splitter, a power detection unit, and a controller; the compensation unit is connected with the optical splitter and the controller, the optical splitter is connected with the power detection unit, and the power detection unit is connected with the controller;

the optical splitter is configured to split a target optical signal transmitted by the compensation unit to obtain a first optical signal, a second optical signal, and a third optical signal, transmit the first optical signal to a next-span optical fiber, and transmit the second optical signal and the third optical signal to the power detection unit, where the target optical signal includes optical beams with multiple wavelengths, and the next-span optical fiber is used to transmit an optical signal output by the apparatus;

the power detection unit is configured to perform power detection on the second optical signal and the third optical signal, and send target power information carrying a first power detection value and a second power detection value to the controller, where the first power detection value is detected optical power of the second optical signal, and the second power detection value is detected optical power of the third optical signal after filtering;

the controller is configured to determine an average compensation gain value and a plurality of second gain values corresponding to a plurality of wavelengths of the optical signal transmitted in the next span optical fiber according to the first power detection value and the second power detection value carried in the target optical power information, send a first control instruction carrying the average compensation gain value to the compensation unit, and send a second control instruction carrying the plurality of second gain values to the compensation unit, where the plurality of second gain values correspond to the wavelengths of the optical signal transmitted in the next span optical fiber one to one;

the compensation unit is configured to receive a fourth optical signal output by a last cross optical fiber, where the last cross optical fiber is configured to output an optical signal to the apparatus;

the compensation unit further comprises at least one optical amplifier and one or more tunable filters, the at least one optical amplifier and the one or more tunable filters are sequentially connected, and the at least one optical amplifier and the one or more tunable filters are connected with the controller;

the at least one optical amplifier is configured to receive the first control instruction sent by the controller, amplify the received optical signal according to the average compensation gain value carried by the received first control instruction, and transmit the amplified optical signal;

the one or more tunable filters are configured to receive the second control instruction sent by the controller, filter the received optical signal according to the plurality of second gain values carried in the received second control instruction, and emit the filtered optical signal.

The device can determine an average compensation gain value and a plurality of second gain values corresponding to a plurality of wavelengths of an optical signal transmitted in the next span optical fiber through a controller according to a first power detection value and a second power detection value detected by a power detection unit, send a first control command and a second control command to the compensation unit, amplify a received fourth optical signal according to the average compensation gain value in the first control command by an optical amplifier in the compensation unit, and filter the received optical signal according to the plurality of second gain values in the second control command by an adjustable filter in the compensation unit, so that the fourth optical signal input into the compensation unit can be accurately compensated in real time.

In one possible implementation, the controller is configured to:

determining the optical power of the target optical signal and the optical power of the target optical signal after filtering based on the first power detection value and the second power detection value carried by the target power information; determining the average compensation gain value according to the optical power of the target optical signal and the optical power of the target optical signal after filtering; and determining a plurality of second gain values corresponding to the plurality of wavelengths according to a plurality of raman gain values corresponding to the plurality of wavelengths, wherein the plurality of raman gain values are gains generated by raman effect when the light beams with the plurality of wavelengths are transmitted in the next span of optical fiber, and the plurality of raman gain values are in one-to-one correspondence with the wavelengths of the optical signals transmitted in the next span of optical fiber.

In one possible implementation, the controller is configured to:

determining a plurality of Raman gain values corresponding to the plurality of wavelengths according to the optical power of the target optical signal, the optical power of the target optical signal after filtering and the length of the next span optical fiber; and determining the average compensation gain value according to a plurality of Raman gain values corresponding to the plurality of wavelengths.

In one possible implementation, the controller is configured to:

determining the power gradient of the optical signal transmitted next across the optical fiber according to a plurality of Raman gain values corresponding to the plurality of wavelengths; determining a plurality of second gain values corresponding to the plurality of wavelengths according to the power gradient and the plurality of wavelengths;

wherein the power gradient is a slope of optical power with respect to wavelength when the optical signal transmitted in the next span optical fiber leaves the next span optical fiber.

In a possible implementation manner, the first control instruction includes at least one first gain control instruction, each first gain control instruction carries one first sub-gain value, the at least one first gain control instruction is in one-to-one correspondence with the at least one optical amplifier, and a sum of at least one first sub-gain value carried by the at least one first gain control instruction is equal to the average compensation gain value;

each optical amplifier is configured to receive a corresponding first gain control instruction sent by the controller, amplify a received optical signal according to a first sub-gain value carried by the received corresponding first gain control instruction, and transmit the amplified optical signal.

In one possible implementation, the one tunable filter is located at an input or an output of any one of the at least one optical amplifier;

and the tunable filter is configured to receive the second control instruction sent by the controller, filter the received optical signal according to the plurality of second gain values carried by the second control instruction, and output the filtered optical signal.

In one possible implementation, each tunable filter of the plurality of tunable filters is located at an input or an output of any one of the at least one optical amplifier, or at an output or an output of another tunable filter.

In a possible implementation manner, the second control instruction includes a plurality of second gain control instructions, the number of the plurality of second gain control instructions is equal to the sum of the number of the plurality of tunable filters, and the plurality of second gain control instructions correspond to the plurality of tunable filters one to one;

each second gain control instruction carries a group of second sub-gain values corresponding to a plurality of wavelengths of the optical signal transmitted in the next span optical fiber, wherein the plurality of wavelengths are in one-to-one correspondence with a plurality of second sub-gain values in the group of second sub-gain values;

the sum of a plurality of second sub-gain values corresponding to any one of the plurality of wavelengths is equal to a second gain value corresponding to the any one of the plurality of wavelengths;

each tunable filter in the multiple tunable filters is configured to receive one corresponding second gain control instruction sent by the controller, filter the received optical signal according to a group of second sub-gain values in the received corresponding second gain control instruction, and transmit the filtered optical signal.

In one possible implementation, the one or more tunable filters include a first tunable filter as an output of the compensation unit.

In one possible implementation, the spectral shape of the optical signal output by each of the one or more tunable filters is linear or quasi-linear over the wavelength range of the optical signal transmitted in each optical amplifier.

In one possible implementation, the optical power slope is within an adjustable optical power slope range of each of the one or more adjustable filters, and an adjustment speed of each of the one or more adjustable filters to the optical signal is at least on the order of microseconds.

In one possible implementation, each of the one or more tunable filters has a sinusoidal filtering characteristic with a half-cycle that is greater than or equal to a wavelength range of the optical signal that each optical amplifier is capable of processing.

In a third aspect, a method for compensating an optical signal is provided, the method comprising:

acquiring a first optical signal, a second optical signal and a third optical signal; performing power detection on the second optical signal to obtain optical power of the target optical signal, and performing power detection on the third optical signal to obtain optical power of the target optical signal after filtering; determining a plurality of first gain values corresponding to a plurality of wavelengths of an optical signal transmitted in the next span optical fiber according to the optical power of the target optical signal and the optical power of the target optical signal after filtering; amplifying the fourth optical signal output by the last span optical fiber according to the plurality of first gain values to obtain a fifth optical signal;

the first optical signal, the second optical signal and the third optical signal are obtained by splitting a target optical signal output by a last cross optical fiber, the first optical signal is transmitted in the next cross optical fiber, the target optical signal includes light beams with multiple wavelengths, and the multiple first gain values are in one-to-one correspondence with the wavelengths of the optical signals transmitted in the next cross optical fiber.

In a possible implementation manner, the determining, according to the optical power of the target optical signal and the optical power after filtering the target optical signal, a plurality of first gain values corresponding to a plurality of wavelengths of the optical signal transmitted in the next span optical fiber includes:

determining a plurality of raman gain values corresponding to the plurality of wavelengths according to the optical power of the target optical signal, the optical power of the target optical signal after filtering, and the length of the next span optical fiber, where the plurality of raman gain values are gains generated by raman effect when the optical beams with the plurality of wavelengths are transmitted through the next span optical fiber, and the plurality of raman gain values are in one-to-one correspondence with the wavelengths of the optical signals transmitted through the next span optical fiber;

and determining a plurality of first gain values corresponding to the plurality of wavelengths according to a plurality of Raman gain values corresponding to the plurality of wavelengths.

In a possible implementation manner, the performing power detection on the second optical signal to obtain the optical power of the target optical signal includes:

performing power detection on the second optical signal to obtain a first power detection value, wherein the first power detection value is the detected optical power of the second optical signal; and determining the optical power of the target optical signal based on the first power detection value.

In a possible implementation manner, the performing power detection on the third optical signal to obtain the filtered optical power of the target optical signal includes:

filtering the third optical signal to obtain a filtered signal; performing power detection on the filtered signal to obtain a second power detection value, wherein the second power detection value is detected optical power of the third optical signal after filtering; and determining the filtered optical power of the target optical signal based on the second power detection value.

In a fourth aspect, a method for compensating an optical signal is provided, the method comprising:

acquiring a first optical signal, a second optical signal and a third optical signal; performing power detection on the second optical signal to obtain optical power of the target optical signal, and performing power detection on the third optical signal to obtain optical power of the target optical signal after filtering; determining an average compensation gain value and a plurality of second gain values corresponding to a plurality of wavelengths of the optical signal transmitted in the next span optical fiber according to the optical power of the target optical signal and the optical power of the target optical signal after filtering; according to the average compensation gain value, compensating the fourth optical signal output by the last span optical fiber to obtain a sixth optical signal; filtering the sixth optical signal according to the plurality of second gain values to obtain a fifth optical signal;

the first optical signal, the second optical signal and the third optical signal are obtained by splitting a target optical signal, the first optical signal is transmitted in a next cross optical fiber, the target optical signal includes light beams with multiple wavelengths, and the multiple second gain values are in one-to-one correspondence with the wavelengths of the optical signals transmitted in the next cross optical fiber.

In a possible implementation manner, the determining, according to the optical power of the target optical signal and the filtered optical power of the target optical signal, an average compensation gain value and a plurality of second gain values corresponding to a plurality of wavelengths of the optical signal transmitted in the next span optical fiber includes:

determining the optical power of the target optical signal and the filtered optical power of the target optical signal based on a first power detection value and a second power detection value; determining the average compensation gain value according to the optical power of the target optical signal and the optical power of the target optical signal after filtering; determining a plurality of second gain values corresponding to the plurality of wavelengths according to a plurality of Raman gain values corresponding to the plurality of wavelengths;

the first power detection value is detected optical power of the second optical signal, the second power detection value is detected optical power after filtering of the third optical signal, the plurality of raman gain values are gains generated by raman effect when the light beams with the plurality of wavelengths are transmitted in the next span of optical fiber, and the plurality of raman gain values are in one-to-one correspondence with the wavelengths of the optical signals transmitted in the next span of optical fiber.

In a possible implementation manner, the determining the average compensation gain value according to the optical power of the target optical signal and the filtered optical power of the target optical signal includes:

determining a plurality of Raman gain values corresponding to the plurality of wavelengths according to the optical power of the target optical signal, the optical power of the target optical signal after filtering, and the length of the next span optical fiber, and determining the average compensation gain value according to the plurality of Raman gain values corresponding to the plurality of wavelengths.

In a possible implementation manner, the determining, according to a plurality of raman gain values corresponding to the plurality of wavelengths, a plurality of second gain values corresponding to the plurality of wavelengths includes:

In one possible implementation, the method further includes:

performing multi-stage compensation on the fourth optical signal, where each stage of compensation process corresponds to one first sub-gain value or one group of second sub-gain values, a sum of at least one first sub-gain value corresponding to the multi-stage compensation process is equal to the average compensation gain value, a group of second sub-gain values includes a plurality of second sub-gain values corresponding to a plurality of wavelengths of the optical signal transmitted in the next span optical fiber, the plurality of wavelengths correspond to the plurality of second sub-gain values one to one, and a sum of at least one second sub-gain value corresponding to any one of the plurality of wavelengths is equal to a second gain value corresponding to the any one of the plurality of wavelengths;

in any one stage of the multi-stage compensation process, when the compensation process corresponds to a first sub-gain value, amplifying the optical signal in the compensation process according to the first sub-gain value corresponding to the compensation process; and when the compensation process corresponds to a group of second sub-gain values, filtering the optical signal in the compensation process according to the group of second sub-gain values corresponding to the compensation process.

In a fifth aspect, an optical signal compensation device is provided, which includes a processor and a memory, where the memory stores at least one instruction, and the instruction is loaded and executed by the processor to implement the operations performed by the optical signal compensation method.

In a sixth aspect, a computer-readable storage medium is provided, in which at least one instruction is stored, and the instruction is loaded and executed by a processor to implement the operations performed by the optical signal compensation method.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an optical signal compensation apparatus according to an embodiment of the present disclosure;

fig. 2 is a schematic diagram of a wavelength division multiplexing system provided in an embodiment of the present application;

fig. 3 is a schematic structural diagram of an optical signal compensation apparatus according to an embodiment of the present disclosure;

fig. 4 is a schematic diagram of raman gain coefficient normalization provided in an embodiment of the present application;

fig. 5 is a schematic structural diagram of an optical signal compensation apparatus according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a compensation unit provided in an embodiment of the present application;

fig. 7 is a schematic structural diagram of an optical signal compensation device according to an embodiment of the present application;

fig. 8 is a flowchart of an optical signal compensation method according to an embodiment of the present application;

fig. 9 is a flowchart of an optical signal compensation method according to an embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Fig. 3 is a schematic structural diagram of an optical signal compensation apparatus provided in an embodiment of the present application, and referring to fig. 3, the apparatus 300 includes an optical amplifier 301, an optical splitter 302, a power detection unit 303, and a controller 304; the optical amplifier 301 is connected to the optical splitter 302 and the controller 304, the optical splitter 302 is connected to the power detection unit 303, and the power detection unit 303 is connected to the controller 304;

the optical splitter 302 is configured to split a target optical signal emitted by the optical amplifier 301 to obtain a first optical signal, a second optical signal, and a third optical signal, emit the first optical signal to a next-span optical fiber, and emit the second optical signal and the third optical signal to the power detection unit 303, where the target optical signal includes optical beams with multiple wavelengths, and the next-span optical fiber is used to transmit an optical signal output by the apparatus 300;

the power detection unit 303 is configured to perform power detection on the second optical signal and the third optical signal, and send target power information carrying a first power detection value and a second power detection value to the controller 304, where the first power detection value is the detected optical power of the second optical signal, and the second power detection value is the detected optical power of the third optical signal after filtering;

the controller 304 is configured to determine, according to the first power detection value and the second power detection value carried in the target power information, a plurality of first gain values corresponding to a plurality of wavelengths of the optical signal transmitted in the next cross optical fiber, and send a target control instruction to the optical amplifier 301, where the target control instruction includes the plurality of first gain values, and the plurality of first gain values are in one-to-one correspondence with the wavelengths of the optical signal transmitted in the next cross optical fiber;

the optical amplifier 301 is configured to receive a fourth optical signal output by a last cross optical fiber, amplify the fourth optical signal according to the plurality of first gain values in the target control instruction to obtain a fifth optical signal, and transmit the fifth optical signal to the optical splitter 302, where the last cross optical fiber is configured to output an optical signal to the apparatus 300.

The target optical signal includes optical beams with multiple wavelengths, for example, the target optical signal includes optical beams with N different wavelengths, where N is an integer equal to or greater than 2, that is, the target optical signal may be a wavelength division multiplexing signal. It should be noted that the optical signals passing through the apparatus 300 are all wavelength division multiplexing signals, for example, the fourth optical signal is also a wavelength division multiplexing signal. The wavelength of each optical signal passing through the apparatus 300 is not particularly limited in the embodiments of the present application.

The next span optical fiber may transmit a light beam within a preset wavelength range, where the preset wavelength range may include multiple wavelengths, and the multiple wavelengths of the optical signal transmitted in the next span optical fiber are also wavelengths within the preset wavelength range, or alternatively, a light beam with any one wavelength within the preset wavelength range may be transmitted in the next span optical fiber, and the preset wavelength range may be an operating wavelength range of the optical amplifier 301.

Each of the plurality of first gain values corresponds to a wavelength of the optical signal transmitted in the next span optical fiber, and the plurality of first gain values may be different, for example, wavelength 1 corresponds to first gain value 1, wavelength 2 corresponds to first gain value 2, and first gain value 1 is not equal to first gain value 2. Of course, in a possible implementation manner, some or all of the plurality of first gain values may also be the same.

The target power information includes first power information and second power information, the first power information carries the first power detection value, and the second power information carries the second power detection value. In one possible implementation manner, the first power information may carry a first power detection value and an unfiltered flag, where the unfiltered flag is used to indicate that the first power detection value carried by the first power information is a power detection value of the unfiltered optical signal. The second power information may carry a second power detection value and a filtering identifier, where the filtering identifier is used to indicate that the second power detection value carried by the second power information is the power detection value of the filtered optical signal.

The target control instruction may further include a wavelength identifier of a wavelength corresponding to each first gain value, so that each first gain value in the target control instruction may correspond to one wavelength, the wavelength identifier of one wavelength is used to indicate the wavelength, and the wavelength identifier may be a length value of the wavelength.

The fourth optical signal is an optical signal received by the apparatus 300 at the current moment, and the fifth optical signal is an optical signal compensated by the apparatus 300 with respect to the fourth optical signal. Since the fifth optical signal is the optical signal compensated by the fourth optical signal, after the optical splitter 302 splits the fifth optical signal, a part of the fifth optical signal is transmitted to the next span optical fiber, and the part of the fifth optical signal can be transmitted in the next span optical fiber and affected by the raman effect, and the part of the fifth optical signal can be recovered as the fourth optical signal.

The connection structure of the device 300 may be: an optical input interface of the optical amplifier 301 is connected to the last span optical fiber, an optical output interface of the optical amplifier 301 is connected to an optical input interface of the optical splitter 302, a first optical output interface of the optical splitter 302 is connected to an optical input interface of the next span optical fiber of the apparatus 300, and an optical output interface of the next span optical fiber is connected to a target apparatus, where the target apparatus is not shown in fig. 3, and the target apparatus may be any apparatus that processes an optical signal transmitted in the next span optical fiber, for example, another optical signal compensation apparatus; the second optical output interface of the optical splitter 302 is connected to the first optical input interface of the power detection unit 303, the third optical output interface of the optical splitter 302 is connected to the second optical input interface of the power detection unit 303, the data output interface of the power detection unit 303 is connected to the data input interface of the controller 304, and the data output interface of the controller 304 is connected to the data input interface of the optical amplifier 301. The optical amplifier 301 and the optical splitter 302 and the power detector may be connected by an optical fiber or an optical waveguide, and the connection manner between the optical amplifier 301 and the optical splitter 302 and between the optical splitter 302 and the power detection unit 303 in the embodiment of the present application is not specifically limited, that is, a transmission channel for transmitting an optical signal inside the apparatus 300 is not specifically limited.

The working principle of the device 300 may be: the optical output interface of the optical amplifier 301 transmits a target optical signal to the optical input interface of the optical splitter 302, the optical splitter 302 may split the target optical signal received by the optical input interface into three optical signals, which are a first optical signal, a second optical signal and a third optical signal, respectively, and transmit the first optical signal to the next span optical fiber through the first optical output interface of the optical splitter 302, so that the first optical signal is transmitted in the next span optical fiber, transmit the second optical signal to the first optical input interface of the power detection unit 303 through the second optical output interface of the optical splitter 302, and transmit the third optical signal to the second optical input interface of the power detection unit 303 through the third optical output interface of the optical splitter 302; the power detection unit 303 may detect the second optical signal received by the first optical interface and the third optical signal received by the second optical interface respectively to obtain a first power detection value and a second power detection value, and send target power information to the data input interface of the controller 304 through the data output interface of the power detection unit 303; the controller 304 determines the plurality of first gain values according to the target power information received by the data input interface, and sends a target control command to the data input interface of the optical amplifier 301 through the data output interface of the controller 304; the optical amplifier 301 amplifies the fourth optical signal output from the previous span optical fiber according to a plurality of first gain values in the target control instruction received from the data input interface to obtain a fifth optical signal, and transmits the fifth optical signal to the optical splitter 302 through the optical output interface of the optical amplifier 301.

To further illustrate the specific structure and operation principle of each unit in the device 300, each unit in the device 300 will be described in detail with reference to fig. 3 through the following four sections 3.1-3.4.

3.1 optical splitter 302

The optical splitter 302 has an optical interface for receiving a target optical signal transmitted by the optical amplifier 301, and the optical splitter 302 may split the received target optical signal based on a target splitting ratio to obtain a first optical signal, a second optical signal, and a third optical signal.

The first optical signal may be most of the target optical signal, and the second optical signal and the third optical signal may be less of the target optical signal, so as to ensure that most of the target optical signal can be transmitted in the next span of optical fiber, and the target splitting ratio may be 9:0.5:0.5 or 9.5:0.25:0.25, which is not specifically limited in the embodiment of the present application.

3.2 Power detection Unit 303

The power detection unit 303 may employ a plurality of power detectors to detect the second optical signal and the third optical signal, respectively, and in a possible implementation manner, the power detection unit 303 includes a first power detector 3031, a filter 3032, and a second power detector 3033; the first power detector 3031 is connected to the optical splitter 302 and the controller 304, the filter 3032 is connected to the optical splitter 302 and the second power detector 3033, and the second power detector 3033 is connected to the controller 304;

the first power detector 3031 is configured to perform power detection on the second optical signal transmitted by the optical splitter 302 to obtain the first power detection value, and send the first power information to the controller 304;

the filter 3032 is configured to perform linear filtering on the third optical signal transmitted by the optical splitter 302 to obtain a filtered signal, and transmit the filtered signal to the second power detector 3033;

the second power detector 3033 is configured to perform power detection on the filtered signal to obtain a second power detection value, and send the second power information to the controller 304.

The connection structure of the power detection unit 303 may be: an optical input interface of the first power detector 3031 is connected to the second optical output interface of the optical splitter 302, a data output interface of the first power detector 3031 is connected to the first data input interface of the controller 304, an optical input interface of the filter 3032 is connected to the third optical output interface of the optical splitter 302, an optical output interface of the filter 3032 is connected to an optical input interface of the second power detector 3033, and a data output interface of the second power detector 3033 is connected to the second data input interface of the controller 304. The optical interface of the first power detector 3031 is also the first optical interface of the power detection unit 303, the optical interface of the filter 3032 is also the second optical interface of the power detection unit 303, and both the first data input interface of the controller 304 and the second data input interface of the controller 304 are data input interfaces of the controller 304.

The working principle of the power detection unit 303 may be: the first power detector 3031 performs power detection on the second optical signal received by the optical interface of the first power detector 3031 to obtain a first power detection value, and sends first power information to the first input interface of the controller 304 through the data output interface of the first power detector 3031; the filter 3032 may perform linear filtering on the third optical signal received by the optical input interface of the filter 3032 based on the current filtering parameter to obtain a filtered signal, and transmit the filtered signal to the optical input interface of the second power detector 3033 through the optical output interface of the filter 3032; the second power detector 3033 may detect the filtered signal received by the optical interface of the second power detector 3033 to obtain a second power detection value, and send second power information to the second data input interface of the controller 304 through the data output interface of the second power detector 3033.

The first power detector 3031 performs power detection on the second optical signal transmitted by the optical splitter 302, and a process of obtaining a first power detection value may be: the first power detector 3031 performs power detection on the light beams of the respective wavelengths in the second optical signal to obtain power detection values of the light beams of the respective wavelengths in the second optical signal, and determines the sum of the power detection values of the light beams of the respective wavelengths in the second optical signal as the first power detection value of the second optical signal. The first power detector 3031 may be a Photodetector (PD).

The filter 3032 may be any filter 3032 for linearly filtering an optical signal, for example, a linear filter, and for any optical signal received by the filter 3032, the optical signal linearly filtered by the filter 3032 may be represented by the following formula (1). Where M is the optical frequency of any of the optical signals, h (M) is the filtering function of the filter 3032, a and b are the filtering parameters of the filter 3032, and a and b may be set by a user after calibrating the actual filtering curve of the filter 3032.

H(M)＝a+bM (1)

The second power detector 3033 performs power detection on the filtered signal, and the process of obtaining the second power detection value may be: the second power detector 3033 performs power detection on the light beams of the respective wavelengths in the filtered signal to obtain power detection values of the light beams of the respective wavelengths in the filtered signal, and sets the sum of the power detection values of the light beams of the respective wavelengths in the filtered signal as a second power detection value. The second power detector 3033 may also be a photodetector.

3.3 controller 304

The process of determining, by the controller 304, a plurality of first gain values corresponding to a plurality of wavelengths of the optical signal transmitted in the next span optical fiber according to the first power detection value and the second power detection value carried by the target power information may be: the controller 304 determines the optical power of the target optical signal and the filtered optical power of the target optical signal based on the first power detection value and the second power detection value carried by the target power information; the controller 304 determines the plurality of first gain values according to the optical power of the target optical signal and the filtered optical power of the target optical signal.

The process of determining the optical power of the target optical signal and the filtered optical power of the target optical signal based on the first power detection value and the second power detection value carried by the target power information by the controller 304 may be: the controller 304 determines the ratio of the second optical signal in the target optical signal according to a target splitting ratio among the first optical signal, the second optical signal and the third optical signal to obtain a first ratio, and the controller 304 takes the ratio between the first power detection value and the first ratio as the optical power of the target optical signal; the controller 304 determines a ratio of the third optical signal in the target optical signal according to the target splitting ratio among the first optical signal, the second optical signal and the third optical signal to obtain a second ratio, and the controller 304 uses a ratio between the second power detection value and the second ratio as the optical power of the target optical signal after filtering.

The controller 304 may determine the plurality of first gain values according to the optical power of the target optical signal and the filtered optical power of the target optical signal by: the controller 304 determines a plurality of raman gain values corresponding to the plurality of wavelengths according to the optical power of the target optical signal, the optical power of the target optical signal after filtering, and the length of the next span optical fiber, where the plurality of raman gain values are gains generated by a raman effect when the light beams with the plurality of wavelengths are transmitted through the next span optical fiber, and the plurality of raman gain values are in one-to-one correspondence with the wavelengths of the optical signals transmitted through the next span optical fiber; the controller 304 determines a plurality of first gain values corresponding to the plurality of wavelengths according to a plurality of raman gain values corresponding to the plurality of wavelengths.

In a possible implementation manner, for any wavelength of the optical signal transmitted in the next span optical fiber, the controller 304 determines a raman gain value corresponding to the any wavelength according to the optical power of the target optical signal, the optical power of the target optical signal after filtering, and the length of the next span optical fiber, where the raman gain value is a gain generated by a raman effect when the optical beam of the any wavelength is transmitted in the next span optical fiber; the controller 304 determines a first gain value corresponding to the arbitrary wavelength according to the raman gain value corresponding to the arbitrary wavelength.

The process of determining the first gain value corresponding to the arbitrary wavelength by the controller 304 according to the raman gain value corresponding to the arbitrary wavelength may be: the controller 304 may determine a negative value of the raman gain value corresponding to the arbitrary wavelength as the first gain value corresponding to the arbitrary wavelength. For example, the raman gain value corresponding to the wavelength 1 is-5, and the raman gain value corresponding to the wavelength 2 is +3, when the light beam with the wavelength 1 and the light beam with the wavelength 2 are transmitted in the next span optical fiber, due to the influence of the raman effect, the light beam with the wavelength 1 may have-5 times of optical power transferred to the light beam with the wavelength 2, so that the optical power of the light beam with the wavelength 1 is consumed, and the optical power of the light beam with the wavelength 2 is increased by +3 times. In view of this situation, before the light beam with the wavelength 1 and the light beam with the wavelength 2 enter the next span optical fiber for transmission, the light beam with the wavelength 1 may be compensated in a positive direction in advance, and the light beam with the wavelength 2 may be compensated in a negative direction in advance, that is, the optical power of the light beam with the wavelength 1 is enlarged by +5 times, and the optical power of the light beam with the wavelength 2 is enlarged by-3 times, so as to increase the optical power of the light beam with the wavelength 1 and decrease the optical power of the light beam with the wavelength 2, and then, when the light beam with the wavelength 1 and the light beam with the wavelength 2 after compensation are transmitted in the next span optical fiber, the increased optical power of the light beam with the wavelength 1 can be transferred to the light beam with the wavelength 2 due to the influence of raman effect to compensate the decreased optical power of the light beam with the wavelength 2 during the negative compensation, so that when the light beam with the wavelength 1 after compensation and the light beam with the wavelength 2 after compensation are output in the next span optical fiber, the light beam of the wavelength 1 before the compensation and the light beam of the wavelength 2 before the compensation can be restored, and therefore the controller 304 determines the negative value of the raman gain value corresponding to the arbitrary wavelength as the first gain value corresponding to the arbitrary wavelength.

In a possible implementation manner, when the arbitrary wavelength is the ith wavelength of the optical signal transmitted in the next span optical fiber, the controller 304 may calculate the raman gain value G corresponding to the ith wavelength by the following formula (2) _R (f _i )。

Where k is a slope obtained by linear fitting of Raman gain coefficients at respective optical frequencies, and f _i The optical frequency of the beam of light of the ith wavelength; l is _eff Is the length of the next span fiber; p is _PD1 Is the optical power of the target optical signal; p is _PD2 The filtered optical power of the target optical signal. The derivation process of equation (2) is as follows:

since the power detection value of the second optical signal is the sum of the power detection values of the light beams of the respective wavelengths in the second optical signal, and the wavelength distribution in the second optical signal is the same as the wavelength distribution in the target optical signal, the optical power P of the target optical signal is obtained _PD1 This can be expressed by the following formula (3).

Wherein N is the number of wavelengths in the target optical signal; j is the jth wavelength, P, in the target optical signal _j The optical power of the optical beam with the jth wavelength in the target optical signal is the ratio between the power detection value of the optical beam with the jth wavelength in the second optical signal and the first ratio.

By performing formula derivation on the above formulas (1) and (3), the optical power P after the target optical signal is filtered can be known _PD2 This can be expressed by the following formula (4). Wherein f is _j Is the optical frequency, P, of the optical beam of the j-th wavelength in the target optical signal _j And f _j Corresponds to, P _j I.e. the optical frequency in the target optical signal is f _j Wherein each wavelength in the target optical signal corresponds to an optical frequency.

Raman gain value G corresponding to ith wavelength _R (f _i ) May be represented by the following formula (5), g _Rj At an optical frequency f _i Referenced at optical frequency f _j Raman gain coefficient of (g) _Ri At an optical frequency f _i Referenced at optical frequency f _i The raman gain coefficient of (a).

Fig. 4 is a schematic diagram of normalization of raman gain coefficient according to an embodiment of the present application, where in a wavelength division multiplexing system, a difference between an optical frequency of a light beam with a minimum wavelength and an optical frequency of a light beam with a maximum wavelength is less than 12THz, and the normalized raman gain coefficient g is within a range where a relative optical frequency difference is less than 12THz _R As shown by curve 1 in fig. 4, the raman gain coefficient g _R A line (linear) can be used to perform a linear fit (e.g. curve 2 in fig. 4), as can be seen from curve 2, at the optical frequency f _i Referenced at optical frequency f _j Raman gain coefficient g _Rj This can be expressed by the following equation (6), where k is also the slope of the curve 2 in fig. 4.

g _Rj ＝k(f _j -f _i ) (6)

The controller 304 substitutes equation (6) into equation (5), G _R (f _i ) It can be simplified to the following equation (7).

Wherein,

the controller 304 substitutes the equations (3) and (4) into the equation (8) to obtain the following equation (9).

The controller 304 may substitute equation (9) into equation 7 to obtain equation (2) above.

It should be noted that, the controller 304 may further store a first power detection value in the first power information received each time and a second power detection value in the second power information received each time, after the first power detection value and the second power detection value are obtained, the controller 304 may further compare the first power detection value obtained this time with the first power detection value obtained last time, compare the second power detection value obtained this time with the second power detection value obtained last time, if the first power detection value obtained this time is the same as the first power detection value obtained last time and the second power detection value obtained this time is the same as the second power detection value obtained last time, it is described that the optical signal output by the optical amplifier 301 at the current time is the target optical signal, that is, the optical signal passing through the optical amplifier 301 at the current time and the optical signal passing through the optical amplifier 301 at the last time are not changed, that is, the wavelength distribution of the optical signal received by the optical amplifier 301 is not dynamically switched, and the wavelength distribution of the optical signal transmitted in the next span optical fiber is not dynamically switched, the controller 304 may not send a new target control instruction to the optical amplifier 301, so as to prevent the optical amplifier 301 from compensating the received optical signal again according to the new target control instruction, and thus, the over-compensation phenomenon can be avoided.

3.4 optical amplifier 301

The optical amplifier 301 may receive the target control instruction sent by the controller 304 through the data input interface, receive the fourth optical signal output by the last cross optical fiber through the light input interface of the optical amplifier 301, and the optical amplifier 301 may compensate the received fourth optical signal according to the received target control instruction to obtain a fifth optical signal, and transmit the fifth optical signal to the light input interface of the optical splitter 302 through the light output interface of the optical amplifier 301.

In a possible implementation manner, for a light beam with any wavelength in the fourth optical signal, the optical amplifier 301 may amplify the light beam with any wavelength in the fourth optical signal according to a first gain value corresponding to the any wavelength in the target control instruction, so as to obtain the light beam with any wavelength in the fifth optical signal.

When the optical amplifier 301 has the basic compensation gain, the optical amplifier 301 may modify the basic compensation gain value corresponding to the arbitrary wavelength to the first gain value corresponding to the arbitrary wavelength, and amplify the optical beam of the arbitrary wavelength in the fourth optical signal. The basic compensation gain is an amplification gain for amplifying the received optical signal when the optical amplifier 301 does not receive the control command.

The optical amplifier 301 may also amplify the light beam with any wavelength in the fourth optical signal based on the basic compensation gain value to obtain a first amplified light beam, and then amplify the first amplified light beam according to a difference between the basic compensation gain value and the first gain value corresponding to the any wavelength.

Alternatively, the optical amplifier 301 may amplify the light beam with any wavelength in the fourth optical signal according to a difference between the basic compensation gain value and the first gain value corresponding to the any wavelength to obtain a second amplified light beam, and then amplify the second amplified light beam based on the basic compensation gain value.

After the fifth optical signal is obtained by the optical amplifier 301, the fifth optical signal may be transmitted to the optical splitter 302, the optical splitter 302 splits the fifth optical signal, and the split fifth optical signal is transmitted to the next span optical fiber, because the first gain value corresponding to each wavelength is a negative value of the raman gain corresponding to any one wavelength, and each optical beam in the fifth optical signal is an optical beam amplified by the optical amplifier 301 based on the first gain value corresponding to the wavelength of each optical beam, the influence of each optical beam due to the raman effect may be compensated, and therefore, when the fifth optical signal outputs the next span optical fiber, the fifth optical signal may be recovered to the fourth optical signal.

The device can determine a plurality of first gain values corresponding to a plurality of wavelengths of an optical signal transmitted in the next span optical fiber through the controller according to a first power detection value and a second power detection value detected by the power detection unit, and issue a target control instruction to the optical amplifier.

The optical signal compensation apparatus 500 may compensate the received optical signal according to the first gain value, and may also compensate the optical signal according to an average compensation gain value and a plurality of second gain values, for example, a schematic structural diagram of an optical signal compensation apparatus provided in the embodiment of the present application shown in fig. 5. The device 500 comprises a compensation unit 501, an optical splitter 502, a power detection unit 503 and a controller 504; the compensation unit 501 is connected to the optical splitter 502 and the controller 504, the optical splitter 502 is connected to the power detection unit 503, and the power detection unit 503 is connected to the controller 504;

the optical splitter 502 is configured to split a target optical signal transmitted by the compensation unit 501 to obtain a first optical signal, a second optical signal, and a third optical signal, transmit the first optical signal to a next-span optical fiber, and transmit the second optical signal and the third optical signal to the power detection unit 503, where the target optical signal includes optical beams with multiple wavelengths, and the next-span optical fiber is used to transmit an optical signal output by the apparatus 500;

the power detection unit 503 is configured to perform power detection on the second optical signal and the third optical signal, and send target power information carrying a first power detection value and a second power detection value to the controller 504, where the first power detection value is the detected optical power of the second optical signal, and the second power detection value is the detected optical power after filtering the third optical signal;

the controller 504 is configured to determine an average compensation gain value and a plurality of second gain values corresponding to a plurality of wavelengths of the optical signal transmitted in the next span optical fiber according to the first power detection value and the second power detection value carried in the target optical power information, send a first control instruction carrying the average compensation gain value to the compensation unit 501, and send a second control instruction carrying the plurality of second gain values to the compensation unit 501, where the plurality of second gain values are in one-to-one correspondence with the wavelengths of the optical signal transmitted in the next span optical fiber;

the compensation unit is used for receiving a fourth optical signal output by a last cross optical fiber, and the last cross optical fiber is used for outputting an optical signal to the device;

the compensation unit 501 further comprises at least one optical amplifier 5011 and one or more tunable filters 5012, the at least one optical amplifier 5011 and the one or more tunable filters 5012 being connected in sequence, the at least one optical amplifier 5011 and the one or more tunable filters 5012 being connected to the controller 504;

the at least one optical amplifier 5011 is configured to receive the first control instruction sent by the controller 504, amplify the received optical signal according to the average compensation gain value carried in the received first control instruction, and transmit the amplified optical signal;

the one or more tunable filters 5012 are configured to receive the second control command sent by the controller 504, filter the received optical signal according to the plurality of second gain values carried in the received second control command, and transmit the filtered optical signal.

Wherein the first control command may include the average compensation gain value. The second control instruction may include the plurality of second gain values and a wavelength identification of a wavelength to which each second gain value corresponds, such that each second gain value in the second control instruction may correspond to a wavelength. For example, the plurality of wavelengths of the optical signal transmitted through the next span optical fiber are wavelength 1, wavelength 2, and wavelength 3, respectively, where wavelength 1 corresponds to the second gain value a, wavelength 2 corresponds to the second gain value B, and wavelength 3 corresponds to the second gain value C.

In a possible implementation manner, the first control instruction may include at least one first gain control instruction, each first gain control instruction carries one first sub-gain value, the at least one first gain control instruction is in one-to-one correspondence with the at least one optical amplifier, and a sum of at least one first sub-gain value carried by the at least one first gain control instruction is equal to the average compensation gain value. When the first control command includes a first gain control command, the first sub-gain value in the first gain control command is the average compensation gain value. The at least one first sub-gain value may be the same or different, for example, the average compensation gain value is 5, the first sub-gain values may include 2 and 3, and the first sub-gain values may also include 2.5 and 2.5.

The second control instruction may include a plurality of second gain control instructions, the number of the plurality of second gain control instructions is equal to the sum of the number of the plurality of tunable filters, and the plurality of second gain control instructions correspond to the plurality of tunable filters one to one; each second gain control instruction carries a group of second sub-gain values corresponding to a plurality of wavelengths of the optical signal transmitted in the next span optical fiber, and the plurality of wavelengths correspond to a plurality of second sub-gain values in the group of second sub-gain values one to one; the sum of the second sub-gain values corresponding to any one of the plurality of wavelengths is equal to the second gain value corresponding to the any one of the plurality of wavelengths. For example, the multiple wavelengths of the optical signal transmitted in the next span optical fiber are wavelength 1, wavelength 2, and wavelength 3, respectively, the wavelength 1 corresponds to a second gain value a, the second gain value a may be divided into a second sub-gain a1 and a second sub-gain a2, the wavelength 2 corresponds to a second gain value B, the second gain value B may be divided into a second sub-gain B1 and a second sub-gain B2, the wavelength 3 corresponds to a second gain value C, the second gain value C may be divided into a second sub-gain C1 and a second sub-gain C2, and 2 groups of second gain values may be obtained: a second sub-gain a1 (corresponding to wavelength 1), a second sub-gain B1 (corresponding to wavelength 2), a second sub-gain C1 (corresponding to wavelength 3); a second sub-gain a2 (corresponding to wavelength 1), a second sub-gain B2 (corresponding to wavelength 2), and a second sub-gain C2 (corresponding to wavelength 3). Wherein, the group of second sub-gains corresponding to the wavelength 1 includes 1dB, 2dB and 3dB, and then the second gain corresponding to the wavelength 1 is 6 dB. It should be noted that the plurality of second sub-gain values corresponding to the same wavelength may be the same or different.

The connection structure of the apparatus 500 may be: an optical input interface of the compensation unit 501 is connected with the last span optical fiber, an optical output interface of the compensation unit 501 is connected with an optical input interface of the optical splitter 502, a first optical output interface of the optical splitter 502 is connected with an optical input interface of the next span optical fiber, and an optical output interface of the next span optical fiber is connected with a target device; the second optical output interface of the optical splitter 502 is connected to the first optical input interface of the power detection unit 503, the third optical output interface of the optical splitter 502 is connected to the second optical input interface of the power detection unit 503, the data output interface of the power detection unit 503 is connected to the data input interface of the controller 504, the first data output interface of the controller 504 is connected to the first data input interface of the compensation unit 501, and the second data output interface of the controller 504 is connected to the second data input interface of the compensation unit 501. The first data input interface of the compensation unit 501 includes the data input interface of the at least one optical amplifier 5011, that is, the data input interface of each optical amplifier 5011 is connected to the first data input interface of the controller 504, and the second data input interface of the compensation unit 501 includes the data input interface of the one or more tunable filters 5012, that is, the data input interface of each tunable filter 5012 is connected to the second data input interface of the controller 504. The optical interface of the compensation unit 501 is an optical interface of a first one of at least one optical amplifier 5011 and one or more tunable filters 5012, which are sequentially connected to each other; the optical output interface of the optical input interface of the compensation unit 501 is the optical output interface of the last one of the at least one optical amplifier 5011 and the one or more tunable filters 5012 connected in sequence. In addition, the compensation unit 501 and the optical splitter 502 and the power detection unit 503 may be connected by an optical fiber, an optical waveguide, or the like, and a transmission channel for transmitting an optical signal inside the optical signal compensation device 500 is not particularly limited in the embodiments of the present application.

The working principle of the apparatus 500 may be: the optical outlet interface of the compensation unit 501 transmits a target optical signal to the optical inlet interface of the optical splitter 502, the optical splitter 502 can split the target optical signal received by the optical inlet interface into three optical signals, which are a first optical signal, a second optical signal, and a third optical signal, respectively, and transmit the first optical signal to the next span optical fiber through the first optical outlet interface of the optical splitter 502, so that the first optical signal is transmitted in the next span optical fiber, transmit the second optical signal to the first optical inlet interface of the power detection unit 503 through the second optical outlet interface of the optical splitter 502, and transmit the third optical signal to the second optical inlet interface of the power detection unit 503 through the third optical outlet interface of the optical splitter 502; the power detection unit 503 may detect the second optical signal received by the first optical interface and the third optical signal received by the second optical interface respectively to obtain a first power detection value and a second power detection value, and send target power information to the data input interface of the controller 504 through the data output interface of the power detection unit 503; the controller 504 determines an average compensation gain value and a plurality of second gain values according to the target power information received by the data input interface, and sends a first control instruction to the first data input interface of the compensation unit 501 through the first data output interface of the controller 504, and sends a second control instruction to the second data input interface of the compensation unit 501 through the second data output interface of the controller 504; at least one optical amplifier 5011 and a first one of the one or more tunable filters 5012, which are sequentially connected in the compensation unit 501, receive a fourth optical signal transmitted across the optical fiber last time, where the at least one optical amplifier 5011 amplifies the received optical signal according to an average gain in the first control instruction, and transmits the amplified optical signal to the optical amplifier or tunable filter connected thereto; the one or more tunable filters 5012 filters the received optical signal according to a plurality of second gains in the second control instruction, and transmits the filtered optical signal to the optical amplifier or tunable filter connected thereto, until the last of the at least one optical amplifier 5011 and the one or more tunable filters 5012 connected in sequence transmits the optical signal to the optical splitter 502, or the optical splitter 502 receives the optical signal as an optical signal compensated by the fourth optical signal output from the last optical fiber by the compensation unit 501.

To further illustrate the specific structure and the operation principle of each unit in the optical signal compensation apparatus 500, each unit in the optical signal compensation apparatus 500 is specifically described with reference to fig. 5 through the following four sections 5.1-5.4.

5.1 optical splitter 502

The optical splitter 502 has an optical interface for receiving the target optical signal transmitted by the optical compensation unit 501, and the optical splitter 502 may split the received target optical signal based on a target splitting ratio to obtain a first optical signal, a second optical signal, and a third optical signal.

5.2, Power detection Unit 503

The power detection unit 503 may employ a plurality of power detectors to detect the second optical signal and the third optical signal respectively, and in a possible implementation manner, the power detection unit 503 includes a first power detector 5031, a filter 5032, and a second power detector 5033; the first power detector 5031 is connected to the optical splitter 502 and the controller 504, the filter 5032 is connected to the optical splitter 502 and the second power detector 5033, and the second power detector 5033 is connected to the controller 504;

the first power detector 5031 is configured to perform power detection on the second optical signal transmitted by the optical splitter 502 to obtain the first power detection value, and send the first power information to the controller 504;

the filter 5032 is configured to perform linear filtering on the third optical signal transmitted by the optical splitter 502 to obtain a filtered signal, and transmit the filtered signal to the second power detector 5033;

the second power detector 5033 is configured to perform power detection on the filtered signal to obtain a second power detection value, and send the second power information to the controller 504.

The connection structure of the power detection unit 503 may be: an optical input interface of the first power detector 5031 is connected to the second optical output interface of the optical splitter 502, a data output interface of the first power detector 5031 is connected to the first data input interface of the controller 504, an optical input interface of the filter 5032 is connected to the third optical output interface of the optical splitter 502, an optical output interface of the filter 5032 is connected to an optical input interface of the second power detector 5033, and a data output interface of the second power detector 5033 is connected to the second data input interface of the controller 504. An optical interface of the first power detector 5031 is also a first optical interface of the power detection unit 503, an optical interface of the filter 5032 is also a second optical interface of the power detection unit 503, and both the first data input interface of the controller 504 and the second data input interface of the controller 504 are data input interfaces of the controller 504.

The working principle of the power detection unit 503 may be: the first power detector 5031 performs power detection on the second optical signal received by the optical interface of the first power detector 5031 to obtain a first power detection value, and sends first power information to the first input interface of the controller 504 through the data output interface of the first power detector 5031; the filter 5032 may perform linear filtering on the third optical signal received by the optical input interface of the filter 5032 based on the current filtering parameter to obtain a filtered signal, and transmit the filtered signal to the optical input interface of the second power detector 5033 through the optical output interface of the filter 5032; the second power detector 5033 may detect the filtered signal received by the optical interface of the second power detector 5033 to obtain a second power detection value, and send second power information to the second data input interface of the controller 504 through the data output interface of the second power detector 5033.

The first power detector 5031 performs power detection on the second optical signal transmitted by the optical splitter 502 to obtain a first power detection value, which may be: the first power detector 5031 performs power detection on the light beams of the respective wavelengths in the second optical signal to obtain power detection values of the light beams of the respective wavelengths in the second optical signal, and sets the sum of the power detection values of the light beams of the respective wavelengths in the second optical signal as the first power detection value of the second optical signal. The first power detector 5031 can be a photodetector.

The filter 5032 can be any filter that linearly filters the optical signal, such as a linear filter.

The second power detector 5033 performs power detection on the filtered signal, and the process of obtaining the second power detection value may be: the second power detector 5033 performs power detection on the light beams of the respective wavelengths in the filtered signal to obtain power detection values of the light beams of the respective wavelengths in the filtered signal, and takes the sum of the power detection values of the light beams of the respective wavelengths in the filtered signal as a second power detection value. The second power detector 5033 can also be a photodetector.

5.3, controller 504

The process of determining, by the controller 504, an average compensation gain value and a plurality of second gain values corresponding to a plurality of wavelengths of the optical signal transmitted in the next span optical fiber according to the first power detection value and the second power detection value carried by the target optical power information may be: the controller 504 determines the optical power of the target optical signal and the filtered optical power of the target optical signal based on the first and second power detection values carried by the target power information (the process is described in 3.3); the controller 504 determines the average compensation gain value according to the optical power of the target optical signal and the filtered optical power of the target optical signal; the controller 504 determines a plurality of second gain values corresponding to the plurality of wavelengths according to a plurality of raman gain values corresponding to the plurality of wavelengths, where the plurality of raman gain values are gains generated by raman effect when the light beams with the plurality of wavelengths are transmitted through the next span optical fiber, and the plurality of raman gain values are in one-to-one correspondence with wavelengths of optical signals transmitted through the next span optical fiber.

The process of determining the average compensation gain value by the controller 504 according to the optical power of the target optical signal and the filtered optical power of the target optical signal may be: the controller 504 determines a plurality of raman gain values corresponding to the plurality of wavelengths according to the optical power of the target optical signal, the filtered optical power of the target optical signal, and the length of the next span optical fiber; the controller 504 determines the average compensation gain value according to a plurality of raman gain values corresponding to the plurality of wavelengths.

Here, the process of determining the plurality of raman gain values corresponding to the plurality of wavelengths by the controller 504 according to the optical power of the target optical signal, the optical power after filtering the target optical signal, and the length of the next span optical fiber is the same as the process of determining the plurality of raman gain values corresponding to the plurality of wavelengths by the controller 304 according to the optical power of the target optical signal, the optical power after filtering the target optical signal, and the length of the next span optical fiber.

The controller 504 may determine the average compensation gain value according to a plurality of raman gain values corresponding to the plurality of wavelengths by: the controller 504 may average a plurality of raman gain values corresponding to a plurality of wavelengths to obtain an average raman gain value, and use a negative value of the average raman gain value as the average compensation gain value.

In a possible implementation manner, the process of determining, by the controller 504, a plurality of second gain values corresponding to the plurality of wavelengths according to a plurality of raman gain values corresponding to the plurality of wavelengths may be implemented by the following steps 1 to 2.

Step 1, the controller 504 determines a power gradient of the optical signal transmitted through the next span optical fiber according to a plurality of raman gain values corresponding to the plurality of wavelengths, where the power gradient is a slope of optical power along with a wavelength change when the optical signal transmitted through the next span optical fiber leaves the next span optical fiber.

Each raman gain value may reflect an optical power change caused by a raman effect when a light beam of a wavelength corresponding to each raman gain is transmitted through a next span optical fiber, and then a slope of a plurality of raman gain values corresponding to a plurality of wavelengths along with the wavelength change is opposite to the power slope, and then the controller 504 may use a negative value of the slope of the plurality of raman gain values corresponding to the plurality of wavelengths along with the wavelength change as the power slope.

Step 2, the controller 504 determines a plurality of second gain values corresponding to the plurality of wavelengths in the plurality of wavelengths according to the power gradient and the plurality of wavelengths.

For any of the plurality of wavelengths, the controller 504 may determine a second gain value corresponding to the any one wavelength based on the any one wavelength, a center wavelength of the optical amplifier 5011, and the power slope, wherein the second gain value corresponding to the any one wavelength is a product between the power slope and a target wavelength difference, the target wavelength difference is a difference between the center wavelength and the any one wavelength, the center wavelength may be a center wavelength within an operating wavelength range of the optical amplifier 5011, for example, the operating wavelength range of the optical amplifier 5011 is 1530nm to 1560nm, and then the center wavelength of the operating wavelength range is 1545 nm. It should be noted that the operating wavelength range of the optical amplifier 5011 includes the wavelength of any light beam that the optical amplifier 5011 can transmit, that is, the wavelength range of the optical signal transmitted in the optical amplifier 5011.

It should be noted that, when the compensation unit 501 only includes one optical amplifier 5011 and one tunable filter 5012, the controller directly sends the first control command to the one optical amplifier 5011 and sends the second control command to the one tunable filter 5012. Such as compensation unit 501 in fig. 5.

When the compensation unit 501 includes a plurality of optical amplifiers 5011, the controller 504 may further divide the average compensation gain value into a plurality of first sub-gain values according to the number of the plurality of optical amplifiers 5011, where each first sub-gain value corresponds to one optical amplifier, and send a first gain control command to each optical amplifier 5011 in the compensation unit 501, where each first gain control command includes a first sub-gain value, that is, each first gain control command corresponds to one optical amplifier 5011. For example, the compensation unit 501A, the compensation unit 501B, and the optical amplifier 5011 in the compensation unit 501D in fig. 6, where fig. 6 is a schematic structural diagram of a compensation unit provided in an embodiment of the present application.

When the compensation unit 501 includes a plurality of tunable filters 5012, the controller 504 may further divide the second gain value corresponding to each wavelength into a plurality of second sub-gain values corresponding to each wavelength according to the number of the tunable filters 5012, and place the plurality of second sub-gain values corresponding to each wavelength in a set of second sub-gain values, respectively, so that each set of second sub-gain values may include a plurality of second sub-gain values, and the plurality of sub-gain values in each set of second sub-gain values correspond to the plurality of wavelengths in a one-to-one manner, and each set of second sub-gain values may correspond to one tunable filter 5012. The controller 504 may also send a corresponding second gain control command to each of the tunable filters 5012, where each second gain control command carries a set of second sub-gain values. It is understood that one second gain control command corresponds to one tunable filter 5012, one second gain control command may carry a set of second sub-gain values and a wavelength identification of the wavelength to which each second sub-gain value in the set of second word gain values corresponds, and each second sub-gain value corresponds to one wavelength identification.

It should be noted that, the controller 504 may further store a first power detection value in the first power information received each time and a second power detection value in the second power information received each time, after the first power detection value and the second power detection value are obtained, the controller 504 may further compare the first power detection value obtained this time with the first power detection value obtained last time, compare the second power detection value obtained this time with the second power detection value obtained last time, if the first power detection value obtained this time is the same as the first power detection value obtained last time and the second power detection value obtained this time is the same as the second power detection value obtained last time, it is described that the optical signal output by the compensation unit 501 at the current time is the target optical signal, that is, the optical signal output by the compensation unit 501 at the current time and the optical signal output by the compensation unit 501 at the last time are not changed, that is, the wavelength distribution of the optical signal received by the compensation unit 501 is not dynamically switched, and the wavelength distribution of the output optical signal is not dynamically changed, so that the wavelength distribution of the optical signal transmitted in the next span optical fiber is not dynamically switched, and the controller 504 may not send the new first control instruction and the new second control instruction to the compensation unit 501, so as to prevent the compensation unit 501 from compensating the received optical signal again according to the new first control instruction and the new second control instruction, and thus, the over-compensation phenomenon can be avoided.

5.4, Compensation Unit 501

In one possible implementation, the compensation unit 501 includes an optical amplifier 5011 and a tunable filter 5012, the optical amplifier 5011 is connected to the tunable filter 5012, and both the optical amplifier 5011 and the tunable filter 5012 are connected to the controller 504; the optical amplifier 5011 is configured to receive a first control instruction sent by the controller 504, amplify a received optical signal according to the average compensation gain value carried in the received first control instruction, and transmit the amplified optical signal; the tunable filter 5012 is configured to receive the second control instruction sent by the controller 504, filter the received optical signal according to the plurality of second gain values carried by the second control instruction, and emit the filtered optical signal.

The tunable filter 5012 can be located at the input or output of the optical amplifier 5011. When the tunable filter is used as the input terminal of the compensation unit 501, the optical input interface of the tunable filter 5012 is connected to the last span optical fiber, the optical output interface of the tunable filter 5012 is connected to the optical input interface of the optical amplifier 5011, the optical output interface of the optical amplifier 5011 is connected to the optical input interface of the optical splitter 502, and at this time, the tunable filter 5012 is located at the input terminal of the optical amplifier 5011. When the tunable filter 5012 is used as the output of the compensation unit 501, the optical input interface of the optical amplifier 5011 is connected to the last span optical fiber, the optical output interface of the optical amplifier 5011 is connected to the optical input interface of the tunable filter 5012, and the optical output interface of the tunable filter 5012 is connected to the optical input interface of the optical splitter 502, and at this time, the tunable filter 5012 is located at the output of the optical amplifier 5011, such as the tunable filter 5012 in fig. 5.

In a possible implementation manner, the compensation unit 501 includes at least one optical amplifier 5011, where each optical amplifier is configured to receive a corresponding first gain control command sent by the controller 504, amplify a received optical signal according to a first sub-gain value carried in the received corresponding first gain control command, and transmit the amplified optical signal.

When the compensation unit includes a plurality of optical amplifiers 5011 and a tunable filter 5012, the tunable filter may be located at the output of any one of the plurality of optical amplifiers 5011. For example, the connection structure in the compensation unit 501 is: tunable filter 5012-optical amplifier 5011, for example, the connection structure in compensation unit 501 is: the connection structure in the optical amplifier 5011-tunable filter 5012-optical amplifier 5011, for example, the compensation unit 501 is: optical amplifier 5011-tunable filter 5012, where "-" is used to indicate the connection relationship.

In one possible implementation, when the compensation unit 501 includes a plurality of tunable filters 5012, each tunable filter 5012 of the plurality of tunable filters 5012 is located at an input or output of any one of the at least one optical amplifier 5011 or at an output or output of the other tunable filters 5012.

When any tunable filter 5012 of the tunable filters 5012 is connected to an optical amplifier 5011, if the optical outlet interface of the any tunable filter 5012 is connected to the optical inlet interface of the optical amplifier 5011, the any tunable filter 5012 is located at the input end of the optical amplifier 5011, for example, the second tunable filter in the compensation unit 501B in fig. 6. When the arbitrary tunable filter 5012 is connected to one optical amplifier 5011, if the optical interface of the arbitrary tunable filter 5012 is connected to the optical interface of one optical amplifier 5011, the arbitrary tunable filter 5012 is located at the output end of one optical amplifier 5011, for example, the last tunable filter 5012 in the compensation unit 501A in fig. 6.

When any one tunable filter 5012 is connected to other tunable filters 5012, the any one tunable filter 5012 may be located at the output or output of the other tunable filters 5012. When the arbitrary tunable filter 5012 is connected to one optical amplifier 5011 and one other tunable filter 5012, if the optical interface of the arbitrary tunable filter 5012 is connected to the optical interface of the other tunable filter 5012, the optical interface of the arbitrary tunable filter 5012 is connected to the optical interface of the optical amplifier 5011, and at this time, the arbitrary tunable filter 5012 is located at the output end of the other tunable filter 5012, for example, the second tunable filter 5012 in the compensation unit 501B in fig. 6. When the arbitrary tunable filter 5012 is connected to one optical amplifier 5011 and one other tunable filter 5012, if the optical interface of the arbitrary tunable filter 5012 is connected to the optical interface of the one optical amplifier 5011, the optical interface of the arbitrary tunable filter 5012 is connected to the optical interface of the other tunable filter 5012, at this time, the arbitrary tunable filter 5012 is located at the input/output end of the other tunable filter 5012, for example, the connection structure of the compensation unit 501 may be an optical amplifier-an arbitrary tunable filter-an other tunable filter.

In one possible implementation, the arbitrary tunable filter 5012 may also be connected to two optical amplifiers 5011, in which case the arbitrary tunable filter 5012 is located at the output of the one optical amplifier 5011 and at the input of another optical amplifier 5011, such as the first tunable filter 5012 in the compensation unit 501A of fig. 6.

In one possible implementation, the arbitrary tunable filter 5012 may also be connected to two other tunable filters 5012, where the arbitrary tunable filter 5012 is located at the output of the other tunable filter 5012 and at the input of the other tunable filter 5012, for example, the second tunable filter 5012 in the compensation unit 501C of fig. 6.

In one possible implementation, the one or more tunable filters 5012 include a first tunable filter as an output of the compensation unit 501. The optical output interface of the first tunable filter is also the optical output interface of the compensation unit 501, the optical output interface of the first tunable filter is connected to the optical input interface of the optical splitter 502, and the optical input interface of the first tunable filter is connected to an adjustable filter 5012 or an optical output interface of an optical amplifier 5011, for example, the adjustable filter 5012 in the compensation unit 501D in fig. 6, at this time, the optical signal emitted by the first tunable filter is also the optical signal compensated by the compensation unit 501.

When the compensation unit 501 includes a plurality of tunable filters 5012, each tunable filter 5012 of the plurality of tunable filters 5012 is configured to receive a corresponding one of the second gain control commands sent by the controller 504, filter the received optical signal according to a set of second sub-gain values in the received corresponding one of the second gain control commands, and transmit the filtered optical signal. Such as compensation units 501A-50C in fig. 6. As for any tunable filter 5012 in the plurality of tunable filters 5012, the any tunable filter may filter the optical beam with each wavelength in the received optical signal according to one second sub-gain value corresponding to each wavelength in one received second gain control instruction, so as to obtain a filtered optical signal.

Based on the above description of various structures of the compensation unit 501, the structure of the compensation unit 501 is summarized as follows: the compensation unit 501 comprises a plurality of sub-units, which are sequentially connected, the plurality of sub-units are all connected with the controller 504, a first sub-unit of the plurality of sub-units is connected with a last span optical fiber, and a last sub-unit is connected with the optical splitter 502; a first subunit of the plurality of subunits is an optical amplifier 5011, a second subunit of the plurality of subunits is an adjustable filter 5012, and a third subunit of the plurality of subunits is an optical amplifier 5011 or an adjustable filter; the first subunit is any subunit of the plurality of subunits, the second subunit is any subunit of the plurality of subunits except the first subunit, the third subunit is an optional unit of the plurality of subunits, and the third subunit may or may not be any subunit of the plurality of subunits except the first subunit and the second subunit.

It should be noted that, within the wavelength range of the optical signal transmitted in each optical amplifier 5011, the spectral shape of the optical signal output by each tunable filter 5012 of the one or more tunable filters 5012 is linear or quasi-linear, so that each tunable filter 5012 can linearly filter the received optical signal.

Each tunable filter 5012 has a sinusoidal filter characteristic having a half cycle greater than or equal to the wavelength range of the optical signal that each optical amplifier 5011 is capable of processing, so that each tunable filter 5012 can filter the optical signal output by any of the optical amplifiers 5011. The adjustment time of the optical signal by each tunable filter 5012 is at least on the order of microseconds so that each tunable filter 5012 can rapidly filter the received optical signal to reduce the transmission delay of the optical signal. Each tunable filter 5012 may be implemented based on a filter having a 1-order sine filtering characteristic, such as a filter of a Mach-Zehnder Interferometer (MZI) structure or a filter of a Fabry-perot Interferometer (FPI) structure, and for example, the tunable filter 5012 may be implemented based on an optical waveguide of an MZI structure or a thin film filter of an FPI structure.

And the optical power slope may be within the range of the optical power slope that each tunable filter 5012 can adjust, in order that each tunable filter 5012 may filter the received optical signal according to the second sub-gain in the second gain control command. That is, each tunable filter 5012 can adjust the power slope of the optical signal. Wherein, the optical power inclination range adjusted by each adjustable filter 5012 can be [ -5dB, +5dB ].

The device can determine an average compensation gain value and a plurality of second gain values corresponding to a plurality of wavelengths of an optical signal transmitted in the next span optical fiber through the controller according to a first power detection value and a second power detection value detected by the power detection unit, send a first control instruction and a second control instruction to the compensation unit, amplify a received fourth optical signal according to the average compensation gain value in the first control instruction through an optical amplifier in the compensation unit, and filter the received optical signal according to the plurality of second gain values in the second control instruction through an adjustable filter in the compensation unit, so that the fourth optical signal input into the compensation unit can be accurately compensated in real time.

Fig. 7 is a schematic structural diagram of an optical signal compensation apparatus 700 provided in this embodiment of the present application, where the optical signal compensation apparatus 700 includes a relatively large difference due to different configurations or performances, and may include one or more processors 701 and one or more memories 702, where the memory 702 stores at least one instruction, and the at least one instruction is loaded and executed by the processor 701 to implement the methods provided in the following method embodiments. Of course, the optical signal compensation device 700 may further include a wired or wireless network interface, a keyboard, an input/output interface, and other components for performing input/output, and the optical signal compensation device 700 may further include other components for implementing device functions, which are not described herein again.

In an exemplary embodiment, a computer-readable storage medium, such as a memory including instructions executable by a processor in a terminal, to perform the optical signal compensation method in the following embodiments is also provided. For example, the computer-readable storage medium may be a read-only memory (ROM), a Random Access Memory (RAM), a compact disc-read-only memory (CD-ROM), a magnetic tape, a floppy disk, an optical data storage device, and the like.

For further explaining the process of compensating the optical signal by the optical signal compensation apparatus 300 shown in fig. 3, refer to a flowchart of an optical signal compensation method provided in the embodiment of the present application as shown in fig. 8, where the method specifically includes:

801. the optical signal compensation apparatus 300 obtains a first optical signal, a second optical signal, and a third optical signal, where the first optical signal, the second optical signal, and the third optical signal are obtained by splitting a target optical signal, the first optical signal is transmitted in a next span optical fiber, and the target optical signal includes optical beams with multiple wavelengths.

This step 801 may be implemented by the optical splitter 302 in the optical signal compensation apparatus 500, and the process of splitting the target optical signal by the optical splitter 302 is described in the foregoing 3.1, and here, this step 801 is not described in detail in this embodiment of the present application.

802. The optical signal compensation device 300 is used for the second optical signal to obtain the optical power of the target optical signal.

The first power detector 3031 in the optical signal compensation apparatus 300 may perform power detection on the second optical signal, and the controller 304 in the optical signal compensation apparatus 300 obtains the optical power of the target optical signal according to the detection result output by the first power detector 3031. In one possible implementation, the step 802 can be implemented by the following process shown in steps 8021 and 8022.

In step 8021, the first power detector 3031 performs power detection on the second optical signal to obtain a first power detection value, where the first power detection value is the detected optical power of the second optical signal.

The process shown in step 8021 is described in the foregoing 3.2, and details of step 8021 are not described in this embodiment of the present application.

Step 8022, the controller 304 determines the optical power of the target optical signal based on the first power detection value.

The process shown in step 8022 is described in the foregoing 3.3, and details of step 8022 are not described in this embodiment of the present application.

803. The optical signal compensation apparatus 300 performs power detection on the third optical signal to obtain the filtered optical power of the target optical signal.

The second power detector 3033 in the optical signal compensation apparatus 300 may perform power detection on the filtered signal of the third optical signal, and the controller 304 in the optical signal compensation apparatus 300 obtains the filtered optical power of the target optical signal according to the output detection result of the second power detector 3033. In one possible implementation, the step 803 may be implemented by the process shown in the following steps 8031-8033.

In step 8031, the filter 3032 filters the third optical signal to obtain a filtered signal.

The process shown in step 8031 is described in the foregoing 3.2, and details of step 8031 are not described in this embodiment of the present application.

Step 8032, the second power detector 3033 performs power detection on the filtered signal to obtain a second power detection value, where the second power detection value is the detected optical power of the third optical signal after filtering.

The process shown in step 8032 is described in the foregoing 3.2, and details of step 8032 are not described in this embodiment of the present application.

Step 8033, the controller 304 determines the filtered optical power of the target optical signal based on the second power detection value.

The process shown in step 8033 is described in the foregoing 3.3, and details of step 8033 are not described in this embodiment of the present application.

It should be noted that, the optical signal compensation apparatus 300 may also execute step 803 first and then execute step 802, or execute steps 802 and 803 at the same time, and the execution sequence of step 802 and step 803 is not specifically limited in this embodiment of the present application.

804. The optical signal compensation apparatus 300 determines a plurality of first gain values corresponding to a plurality of wavelengths of the optical signal transmitted in the next span optical fiber according to the optical power of the target optical signal and the optical power after filtering the target optical signal, where the plurality of first gain values are in one-to-one correspondence with the wavelengths of the optical signal transmitted in the next span optical fiber.

This step 804 may be performed by the controller 304 of the optical signal compensation apparatus 300. In one possible implementation, the process shown in this step 804 may be: for any wavelength of the optical signal transmitted in the next span optical fiber, the controller 304 determines a raman gain value corresponding to the any wavelength according to the optical power of the target optical signal, the optical power of the target optical signal after filtering, and the length of the next span optical fiber, where the raman gain value is a gain value generated by a raman effect when the optical beam of the any wavelength is transmitted in the next span optical fiber; the controller 304 determines a first gain value corresponding to the arbitrary wavelength according to the raman gain value.

805. The optical signal compensation apparatus 300 amplifies the fourth optical signal output by the previous span optical fiber according to the plurality of first gain values, so as to obtain a fifth optical signal.

This step 805 may be performed by the optical amplifier 301 in the optical signal compensation apparatus 300. For a light beam with any wavelength in the fourth optical signal, the optical amplifier 301 may amplify the light beam with any wavelength in the fourth optical signal according to the first gain value corresponding to the any wavelength, so as to obtain a light beam with any wavelength in the fifth optical signal. After the fifth optical signal is obtained by the optical amplifier 301, the fifth optical signal may be transmitted to the optical splitter 302, and the optical splitter 302 splits the fifth optical signal and transmits the split fifth optical signal to the next span optical fiber.

The method comprises the steps that a controller determines a plurality of first gain values corresponding to a plurality of wavelengths of an optical signal transmitted in the next span of optical fiber according to a first power detection value and a second power detection value detected by a power detection unit, and issues a target control instruction to an optical amplifier.

For further explaining the process of compensating the optical signal by the optical signal compensation apparatus 500 shown in fig. 5, refer to a flowchart of an optical signal compensation method provided in this embodiment as shown in fig. 9, where the method specifically includes:

901. the optical signal compensation device 500 obtains a first optical signal, a second optical signal, and a third optical signal, where the first optical signal, the second optical signal, and the third optical signal are obtained by splitting a target optical signal, the first optical signal is transmitted in a next span optical fiber, and the target optical signal includes optical beams with multiple wavelengths.

The process shown in step 901 is the same as the process shown in step 801, and here, this embodiment of the present application does not repeat this step 901.

902. The optical signal compensation apparatus 500 compensates the second optical signal to obtain the optical power of the target optical signal.

The process shown in step 902 is the same as the process shown in step 802, and here, the description of step 902 is not repeated in this embodiment of the present application.

903. The optical signal compensation apparatus 500 performs power detection on the third optical signal to obtain the optical power after filtering the target optical signal.

The process shown in step 903 is the same as the process shown in step 803, and here, the description of step 903 is not repeated in this embodiment of the present application.

It should be noted that, the optical signal compensation apparatus 500 may also perform step 903 before performing step 902, or perform steps 902 and 903 at the same time, and the execution sequence of step 902 and step 903 is not particularly limited in this embodiment of the application.

904. The optical signal compensation apparatus 500 determines an average compensation gain value and a plurality of second gain values corresponding to a plurality of wavelengths of the optical signal transmitted in the next span optical fiber according to the optical power of the target optical signal and the optical power after filtering the target optical signal, where the plurality of second gain values are in one-to-one correspondence with the wavelengths of the optical signal transmitted in the next span optical fiber.

This step 904 may be performed by the controller 504 in the optical signal compensation apparatus 500. In one possible implementation, this step 904 may be implemented by the process shown in steps 9041-9043 described below.

Step 9041 is for the controller 504 to determine the optical power of the target optical signal and the filtered optical power of the target optical signal based on a first power detection value and a second power detection value, wherein the first power detection value is the detected optical power of the second optical signal, and the second power detection value is the detected filtered optical power of the third optical signal.

The process shown in step 9041 is described in the foregoing 5.3, and here, this step 9041 is not described in detail in this embodiment of the present application.

In step 9042, the controller 504 determines the average compensation gain value according to the optical power of the target optical signal and the filtered optical power of the target optical signal.

The process shown in step 9042 is described in the foregoing 5.3, and this embodiment of the present application does not describe this step 9042 again.

In step 9043, the controller 504 determines the plurality of second gain values according to the average compensation gain value and the plurality of wavelengths of the optical signal transmitted in the next span of optical fiber.

The process shown in step 9043 is described in the foregoing 5.3, and this embodiment of the present application does not describe step 9043 again here.

905. The optical signal compensation device 500 compensates the fourth optical signal output by the previous span optical fiber according to the average compensation gain value, so as to obtain a sixth optical signal.

When the compensation unit 501 in the optical signal compensation apparatus 500 has only one optical amplifier 5011, this step 905 can be implemented by the procedure shown by the optical amplifier 5011 in the optical compensation unit 501. The optical amplifier 5011 may amplify the fourth optical signal according to the average compensation gain value to obtain a sixth optical signal.

906. The optical signal compensation device 500 filters the sixth optical signal according to the plurality of second gain values to obtain a fifth optical signal.

When the compensation unit 501 in the optical signal compensation apparatus 500 has only one tunable filter 5012, this step 906 can be performed by the tunable filter 5012. For the light beam with any wavelength in the sixth optical signal, the tunable filter 5012 may filter the light beam with any wavelength in the sixth optical signal according to the second gain value corresponding to the any wavelength, so as to obtain the light beam with any wavelength in the fifth optical signal.

It should be noted that the process shown in the above steps 905 and 906 is also the process of the optical signal compensation apparatus 500 compensating the fourth optical signal by means of an optical amplifier 5011 and an adjustable filter 5012.

When the compensation unit 501 includes a plurality of optical amplifiers 5011 or a plurality of tunable filters 5012, the optical signal compensation apparatus 500 may also perform a multistage compensation process on the fourth optical signal.

In one possible implementation, the controller 504 may further divide the average compensation gain value into a plurality of first sub-gain values according to the number of the plurality of optical amplifiers 5011, where each of the first sub-gain values corresponds to one optical amplifier 5011 and corresponds to one stage of compensation process. The controller 504 may further divide the second gain value corresponding to each wavelength into a plurality of second sub-gain values corresponding to each wavelength according to the number of the plurality of adjustable filters 5012 to obtain a plurality of groups of second sub-gain values, where each group of second sub-gain values corresponds to one adjustable filter 5012 and corresponds to a primary compensation process.

In a possible implementation manner, the optical signal compensation apparatus 500 performs multi-stage compensation on the fourth optical signal, where each stage of compensation process corresponds to one first sub-gain value or one group of second sub-gain values, a sum of at least one first sub-gain value corresponding to the multi-stage compensation process is equal to the average compensation gain value, one group of second sub-gain values includes a plurality of second sub-gain values corresponding to a plurality of wavelengths of the optical signal transmitted in the next span optical fiber, the plurality of wavelengths correspond to the plurality of second sub-gain values one-to-one, and a sum of at least one second sub-gain value corresponding to any one of the plurality of wavelengths is equal to the second gain value corresponding to the any one of the wavelengths; in any one of the multi-stage compensation processes, when the compensation process corresponds to a first sub-gain value, amplifying the optical signal in the compensation process according to the first sub-gain value corresponding to the compensation process; and when the compensation process corresponds to a group of second sub-gain values, filtering the optical signal in the compensation process according to the group of second sub-gain values corresponding to the compensation process.

That is, when the compensation process corresponds to a first sub-gain value, the compensation process is performed by an optical amplifier 5011 in the optical signal compensation apparatus 500, and when the compensation process corresponds to a set of second sub-gain values, the compensation process is performed by an adjustable filter 5012 in the optical signal compensation apparatus 500.

The method can determine an average compensation gain value and a plurality of second gain values corresponding to a plurality of wavelengths of an optical signal transmitted in the next span optical fiber through a controller according to a first power detection value and a second power detection value detected by a power detection unit, send a first control command and a second control command to the compensation unit, amplify a received fourth optical signal according to the average compensation gain value in the first control command by an optical amplifier in the compensation unit, and filter the received optical signal according to the plurality of second gain values in the second control command by an adjustable filter in the compensation unit, so that the fourth optical signal input to the compensation unit can be accurately compensated in real time.

All the above optional technical solutions may be combined arbitrarily to form the optional embodiments of the present disclosure, and are not described herein again.

It should be noted that: in the optical signal compensation apparatus provided in the above embodiment, when the optical signal is compensated, only the division of the above functional modules is illustrated, and in practical applications, the above functions may be distributed by different functional modules according to needs, that is, the internal structure of the apparatus is divided into different functional modules to complete all or part of the above described functions. In addition, the embodiments of the optical signal compensation method provided in the foregoing embodiments belong to the same concept, and specific implementation processes thereof are described in the embodiments of the methods, which are not described herein again.

It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.

The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An optical signal compensation device is characterized by comprising an optical amplifier, an optical splitter, a power detection unit and a controller; the optical amplifier is connected with the optical splitter and the controller, the optical splitter is connected with the power detection unit, and the power detection unit is connected with the controller;

the optical splitter is configured to split a target optical signal transmitted by the optical amplifier to obtain a first optical signal, a second optical signal, and a third optical signal, transmit the first optical signal to a next-span optical fiber, and transmit the second optical signal and the third optical signal to the power detection unit, where the target optical signal includes optical beams with multiple wavelengths, and the next-span optical fiber is used to transmit an optical signal output by the apparatus;

the controller is configured to determine optical power of the target optical signal and optical power after filtering of the target optical signal based on the first power detection value and the second power detection value carried in the target power information, determine a plurality of first gain values corresponding to a plurality of wavelengths of the optical signal transmitted in the next span optical fiber according to the optical power of the target optical signal and the optical power after filtering of the target optical signal, and send a target control instruction to the optical amplifier, where the target control instruction includes the plurality of first gain values, and the plurality of first gain values are in one-to-one correspondence with the wavelengths of the optical signal transmitted in the next span optical fiber;

the optical amplifier is configured to receive a fourth optical signal output by a last cross optical fiber, amplify the fourth optical signal according to the plurality of first gain values in the target control instruction to obtain a fifth optical signal, and transmit the fifth optical signal to the optical splitter, where the last cross optical fiber is configured to output an optical signal to the apparatus.

2. The apparatus of claim 1, wherein the target power information comprises first power information carrying the first power detection value and second power information carrying the second power detection value;

3. The apparatus of claim 1, wherein the controller is configured to:

4. An optical signal compensation device is characterized by comprising a compensation unit, an optical splitter, a power detection unit and a controller; the compensation unit is connected with the optical splitter and the controller, the optical splitter is connected with the power detection unit, and the power detection unit is connected with the controller;

the controller is configured to determine an optical power of the target optical signal and an optical power after filtering the target optical signal based on the first power detection value and the second power detection value carried in the target power information, determine an average compensation gain value according to the optical power of the target optical signal and the optical power after filtering the target optical signal, determine a plurality of second gain values corresponding to a plurality of wavelengths of the optical signal transmitted through the next span optical fiber according to a plurality of raman gain values corresponding to the plurality of wavelengths, send a first control instruction carrying the average compensation gain value to the compensation unit, and send a second control instruction carrying the plurality of second gain values to the compensation unit, where the plurality of raman gain values are gains generated by an effect when the optical beam with the plurality of wavelengths is transmitted through the next span optical fiber, the plurality of Raman gain values correspond to the wavelengths of the optical signals transmitted in the next span of optical fiber one by one, and the plurality of second gain values correspond to the wavelengths of the optical signals transmitted in the next span of optical fiber one by one;

5. The apparatus of claim 4, wherein the target power information comprises first power information carrying the first power detection value and second power information carrying the second power detection value;

the power detection unit comprises a first power detector, a filter and a second power detector; the first power detector is connected to the optical splitter and the controller, the filter is connected to the optical splitter and the second power detector, and the second power detector is connected to the controller;

6. The apparatus of claim 4, wherein the controller is configured to:

determining a plurality of Raman gain values corresponding to the plurality of wavelengths according to the optical power of the target optical signal, the optical power of the target optical signal after filtering and the length of the next span optical fiber;

and determining the average compensation gain value according to a plurality of Raman gain values corresponding to the plurality of wavelengths.

7. The apparatus of claim 6, wherein the controller is configured to:

determining a power gradient of the optical signal transmitted in the next span of optical fiber according to a plurality of Raman gain values corresponding to the plurality of wavelengths, wherein the power gradient is a slope of optical power variation with wavelength when the optical signal transmitted in the next span of optical fiber leaves the next span of optical fiber;

and determining a plurality of second gain values corresponding to the plurality of wavelengths according to the power gradient and the plurality of wavelengths.

8. The apparatus of claim 4, wherein the first control commands comprise at least one first gain control command, each first gain control command carrying a first sub-gain value, the at least one first gain control command corresponding to the at least one optical amplifier, the at least one first gain control command carrying a sum of at least one first sub-gain value equal to the average compensation gain value;

9. The apparatus of claim 4, wherein said one tunable filter is located at an input or an output of any one of said at least one optical amplifier;

10. The apparatus of claim 4, wherein each tunable filter of the plurality of tunable filters is located at an input or output of any one of the at least one optical amplifier or at an output or output of another tunable filter.

11. The apparatus of claim 10, wherein the second control instruction comprises a plurality of second gain control instructions, the number of the plurality of second gain control instructions is equal to the sum of the number of the plurality of tunable filters, and the plurality of second gain control instructions are in one-to-one correspondence with the plurality of tunable filters;

each tunable filter in the plurality of tunable filters is configured to receive one second gain control instruction sent by the controller, filter the received optical signal according to a group of second sub-gain values in the received corresponding second gain control instruction, and emit the filtered optical signal.

12. The apparatus of any of claims 4-11, wherein the one or more tunable filters comprise a first tunable filter, the first tunable filter being an output of the compensation unit.

13. The apparatus of any of claims 4-11, wherein the spectral shape of the optical signal output by each of the one or more tunable filters is linear or quasi-linear over the wavelength range of the optical signal transmitted in each optical amplifier.

14. The apparatus of any one of claims 4-11, wherein the optical power slope is within an adjustable optical power slope range of each of the one or more tunable filters, and wherein the speed of adjustment of the optical signal by each of the one or more tunable filters is in the order of at least microseconds.

15. The apparatus of any of claims 4-11, wherein each of the one or more tunable filters has a sinusoidal filtering characteristic with a half-cycle greater than or equal to a wavelength range of an optical signal that each optical amplifier is capable of processing.

16. A method of compensating an optical signal, the method comprising:

acquiring a first optical signal, a second optical signal and a third optical signal, wherein the first optical signal, the second optical signal and the third optical signal are obtained by splitting a target optical signal output by a last cross optical fiber, the first optical signal is transmitted in a next cross optical fiber, and the target optical signal comprises light beams with multiple wavelengths;

performing power detection on the second optical signal to obtain optical power of the target optical signal, and performing power detection on the third optical signal to obtain optical power of the target optical signal after filtering;

determining a plurality of first gain values corresponding to a plurality of wavelengths of the optical signal transmitted in the next span optical fiber according to a plurality of raman gain values corresponding to the plurality of wavelengths, wherein the plurality of first gain values correspond to the wavelengths of the optical signal transmitted in the next span optical fiber one to one;

and amplifying the fourth optical signal output by the last cross optical fiber according to the plurality of first gain values to obtain a fifth optical signal.

17. The method of claim 16, wherein the power detecting the third optical signal to obtain the filtered optical power of the target optical signal comprises:

filtering the third optical signal to obtain a filtered signal;

performing power detection on the filtered signal to obtain a second power detection value, wherein the second power detection value is detected optical power of the third optical signal after filtering;

and determining the filtered optical power of the target optical signal based on the second power detection value.

18. A method of compensating an optical signal, the method comprising:

acquiring a first optical signal, a second optical signal and a third optical signal, wherein the first optical signal, the second optical signal and the third optical signal are obtained by splitting a target optical signal, the first optical signal is transmitted in a next span optical fiber, and the target optical signal comprises light beams with multiple wavelengths;

determining the optical power of the target optical signal and the filtered optical power of the target optical signal based on a first power detection value and a second power detection value, wherein the first power detection value is the detected optical power of the second optical signal, and the second power detection value is the detected filtered optical power of the third optical signal;

determining an average compensation gain value according to the optical power of the target optical signal and the optical power of the target optical signal after filtering;

determining a plurality of second gain values corresponding to a plurality of wavelengths of the optical signal transmitted in the next span optical fiber according to a plurality of raman gain values corresponding to the plurality of wavelengths, wherein the plurality of raman gain values are gains generated by raman effects when the optical beams with the plurality of wavelengths are transmitted in the next span optical fiber, the plurality of raman gain values are in one-to-one correspondence with the wavelengths of the optical signal transmitted in the next span optical fiber, and the plurality of second gain values are in one-to-one correspondence with the wavelengths of the optical signal transmitted in the next span optical fiber;

according to the average compensation gain value, compensating a fourth optical signal output by the last span of optical fiber to obtain a sixth optical signal;

and filtering the sixth optical signal according to the plurality of second gain values to obtain a fifth optical signal.

19. The method of claim 18, further comprising:

performing multi-stage compensation on the fourth optical signal, where each stage of compensation process corresponds to one first sub-gain value or one group of second sub-gain values, a sum of at least one first sub-gain value corresponding to the multi-stage compensation process is equal to the average compensation gain value, a group of second sub-gain values includes multiple second sub-gain values corresponding to multiple wavelengths of the optical signal transmitted in the next span optical fiber, the multiple wavelengths correspond to the multiple second sub-gain values one to one, and a sum of at least one second sub-gain value corresponding to any one wavelength in the multiple wavelengths is equal to a second gain value corresponding to the any one wavelength;

in any one stage of compensation process in the multi-stage compensation process, when the compensation process corresponds to a first sub-gain value, amplifying an optical signal in the compensation process according to the first sub-gain value corresponding to the compensation process; and when the compensation process corresponds to a group of second sub-gain values, filtering the optical signal in the compensation process according to the group of second sub-gain values corresponding to the compensation process.

20. An optical signal compensation device, comprising a processor and a memory, wherein the memory has stored therein at least one instruction that is loaded and executed by the processor to perform operations performed by the optical signal compensation method of any one of claims 16 to 19.

21. A computer-readable storage medium having stored therein at least one instruction which is loaded and executed by a processor to perform operations performed by the optical signal compensation method of any one of claims 16 to 19.