CN111164911A

CN111164911A - Method and device for suppressing and modulating optical carrier

Info

Publication number: CN111164911A
Application number: CN201780095515.6A
Authority: CN
Inventors: 王勰; 余毅; 李良川
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-10-13
Filing date: 2017-10-13
Publication date: 2020-05-15
Anticipated expiration: 2037-10-13
Also published as: WO2019071614A1; CN111164911B

Abstract

The embodiment of the application provides a method and a device for optical carrier suppression modulation, wherein the method comprises the following steps: receiving an optical signal to be processed, and splitting the optical signal to be processed to obtain a first branch split-wave signal and a second branch split-wave signal, wherein the optical signal to be processed is a single-polarization optical signal; carrying out optical carrier suppression modulation on the first branch wave division signal to obtain a first modulated optical carrier, and carrying out power adjustment and phase adjustment on the second branch wave division signal to obtain a compensated optical carrier; wherein the first modulated optical carrier comprises an unsuppressed optical carrier, and the compensating optical carrier is configured to interfere with the first modulated optical carrier to cancel the unsuppressed optical carrier; the method for suppressing and modulating the optical carrier combines the first modulated optical carrier and the compensation optical carrier to obtain a second modulated optical carrier. The method for suppressing and modulating the optical carrier provided by the embodiment of the application suppresses the residual optical carrier and improves the performance of suppressing and modulating the optical carrier.

Description

Method and device for suppressing and modulating optical carrier

Technical Field

The embodiment of the application relates to the technical field of optical communication, in particular to a method and a device for suppressing and modulating an optical carrier.

Background

In high-speed optical network systems, optical carrier suppression modulation techniques are often used. The optical carrier suppression modulation technology means that after optical carrier modulation, because optical carrier components do not contain any information and occupy a large proportion of the power of the whole modulated signal, great waste of transmitting power is caused. Therefore, the optical carrier is suppressed before transmission, and the transmitting power of the transmitter can be greatly saved under the condition of not influencing the transmission information. For example, generation of carrier-suppressed return-to-zero (CSRZ), Quadrature Phase Shift Keying (QPSK) and Quadrature Amplitude Modulation (16 QAM) signals, and so on.

Currently, optical carrier rejection modulation is usually implemented using a mach-zehnder modulator (MZM) or an in-phase quadrature (IQ) modulator. The dc bias of the mach-zehnder modulator may be at the lowest point of the power transfer function when generating the CSRZ code. When generating a QPSK signal or a 16QAM signal, the dc bias of the IQ modulator can be at the lowest point of the power transfer function.

However, when the optical carrier is suppressed and modulated by using a mach-zehnder modulator or an IQ modulator, the modulated optical carrier cannot be suppressed completely, and a residual optical carrier remains. Resulting in wasted transmit power and reduced signal modulation quality and signal transmission performance.

Disclosure of Invention

The embodiment of the application provides a method and a device for optical carrier suppression modulation, which suppress residual optical carriers and improve the performance of optical carrier suppression modulation.

In a first aspect, an embodiment of the present application provides a method for optical carrier suppression modulation, where the method includes: the method comprises the steps of obtaining an optical signal to be processed, splitting the optical signal to be processed to obtain a first branch split-wave signal and a second branch split-wave signal, wherein the optical signal to be processed is a single-polarization optical signal. And performing optical carrier suppression modulation on the first branch wave-splitting signal to obtain a first modulated optical carrier, and performing power adjustment and phase adjustment on the second branch wave-splitting signal to obtain a compensated optical carrier. Wherein the first modulated optical carrier comprises an unsuppressed optical carrier, and the compensating optical carrier is configured to interfere with the first modulated optical carrier to cancel the unsuppressed optical carrier. And combining the first modulated optical carrier and the compensation optical carrier to obtain a second modulated optical carrier.

By the optical carrier suppression modulation method provided by the first aspect, two optical splitting branches can be obtained for splitting the input single-polarization optical signal, or a new optical splitting branch is introduced. One of the light splitting branches carries out optical carrier suppression modulation processing. After the power adjustment and the phase adjustment are carried out on the new light splitting branch, the principle of destructive interference of light is utilized, the optical carrier which is not suppressed after the optical carrier suppression modulation processing is greatly suppressed, the extinction ratio of the optical carrier suppression modulator is enlarged, and the transmission performance of the system is improved.

Optionally, in a possible implementation manner of the first aspect, before acquiring the optical signal to be processed, the method further includes: performing photoelectric conversion on a second modulated optical carrier obtained after the last optical carrier suppression modulation processing, and detecting whether the second modulated optical carrier obtained after the last optical carrier suppression modulation processing also comprises an optical carrier which is not suppressed; and if the second modulated optical carrier obtained after the last optical carrier suppression modulation processing also comprises the optical carrier which is not suppressed, generating a power adjustment electric signal and a phase adjustment electric signal according to the second modulated optical carrier obtained after the last optical carrier suppression modulation processing after photoelectric conversion. Correspondingly, the power adjustment and the phase adjustment are performed on the second branch wavelength division signal to obtain the compensated optical carrier, including: and carrying out power adjustment on the second branch wave division signal according to the power adjustment electric signal, and carrying out phase adjustment on the second branch wave division signal according to the phase adjustment electric signal to obtain a compensation optical carrier.

Optionally, in a possible implementation manner of the first aspect, the method further includes: performing photoelectric conversion on the second modulated optical carrier, and detecting whether the second modulated optical carrier further comprises an optical carrier which is not suppressed; if the second modulated optical carrier also comprises an optical carrier which is not inhibited, generating a power adjusting electric signal and a phase adjusting electric signal according to the second modulated optical carrier after photoelectric conversion; the power adjustment electrical signal is used for performing power adjustment on a second branch wavelength division signal obtained by wavelength division of the acquired optical signal to be processed during next optical carrier suppression modulation processing, and the phase adjustment electrical signal is used for performing phase adjustment on a second branch wavelength division signal obtained by wavelength division of the acquired optical signal to be processed during next optical carrier suppression modulation processing.

By setting a feedback mechanism in the method for optical carrier suppression modulation provided by this possible embodiment, the next optical carrier suppression modulation can be corrected according to the result of the current optical carrier suppression modulation. Therefore, the destructive interference effect of light is improved, the optical carrier which is not suppressed after the optical carrier suppression modulation is further suppressed, and the performance of the optical carrier suppression modulation is improved.

Optionally, in a possible implementation manner of the first aspect, before receiving the optical signal to be processed, the method further includes: a dual polarized optical signal is received. And carrying out polarization splitting on the dual-polarization optical signals to obtain two single-polarization optical signals with vertical polarization directions, wherein the two single-polarization optical signals with the vertical polarization directions are respectively used as optical signals to be processed.

Optionally, in a possible implementation manner of the first aspect, the method further includes: and respectively polarizing and combining the second modulated light carriers corresponding to the two single-polarized light signals with the vertical polarization directions to obtain a third modulated light carrier.

By the method for optical carrier suppression modulation provided by the possible embodiment, optical carrier suppression modulation of dual-polarization optical signals can be realized.

In a second aspect, an embodiment of the present application provides an apparatus for optical carrier suppression modulation, including: the optical modulator comprises a first coupler, a second coupler, a carrier rejection modulator and an optical adjusting unit. The output end of the first coupler is respectively connected with the input end of the carrier suppression modulator and the input end of the light adjusting unit, and the output end of the carrier suppression modulator and the output end of the light adjusting unit are both connected with the input end of the second coupler. The first coupler is used for receiving an optical signal to be processed, splitting the optical signal to be processed to obtain a first branch split signal and a second branch split signal, outputting the first branch split signal to the carrier suppression modulator, and outputting the second branch split signal to the optical adjusting unit. The optical signal to be processed is a single-polarization optical signal. And the carrier suppression modulator is used for carrying out optical carrier suppression modulation on the first branch wave-splitting signal output by the first coupler to obtain a first modulated optical carrier, and outputting the first modulated optical carrier to the second coupler, wherein the first modulated optical carrier comprises an optical carrier which is not suppressed. And the optical adjusting unit is used for carrying out power adjustment and phase adjustment on the second branch wave division signal output by the first coupler to obtain a compensation optical carrier, outputting the compensation optical carrier to the second coupler, and the compensation optical carrier is used for interfering with the first modulation optical carrier to offset the optical carrier which is not inhibited. And the second coupler is used for combining the first modulated optical carrier output by the carrier suppression modulator and the compensation optical carrier output by the optical adjusting unit to obtain a second modulated optical carrier and outputting the second modulated optical carrier.

Optionally, in a possible implementation manner of the second aspect, a feedback unit is further included. The input end of the feedback unit is connected with the output end of the second coupler, and the output end of the feedback unit is connected with the input end of the light adjusting unit. The feedback unit is used for: performing photoelectric conversion on the second modulated optical carrier output by the second coupler after the last optical carrier suppression modulation processing, and detecting whether the second modulated optical carrier output by the second coupler after the last optical carrier suppression modulation processing also comprises an optical carrier which is not suppressed; and if the second modulated optical carrier output by the second coupler after the last optical carrier suppression modulation processing also comprises the optical carrier which is not suppressed, generating a power adjustment electric signal and a phase adjustment electric signal according to the second modulated optical carrier output by the second coupler after the last optical carrier suppression modulation processing after photoelectric conversion, and outputting the power adjustment electric signal and the phase adjustment electric signal to the optical adjustment unit. Correspondingly, the light adjusting unit is specifically configured to: and performing power adjustment on the second branch wave division signal according to the power adjustment electric signal output by the feedback unit, and performing phase adjustment on the second branch wave division signal according to the phase adjustment electric signal output by the feedback unit to obtain a compensation optical carrier.

Optionally, in a possible implementation manner of the second aspect, a feedback unit is further included. The input end of the feedback unit is connected with the output end of the second coupler, and the output end of the feedback unit is connected with the input end of the light adjusting unit. The feedback unit is used for: the second modulated optical carrier output by the second coupler is photoelectrically converted, and whether the second modulated optical carrier further includes an optical carrier which is not suppressed is detected. And if the second modulated optical carrier also comprises an optical carrier which is not inhibited, generating a power adjusting electric signal and a phase adjusting electric signal according to the second modulated optical carrier after photoelectric conversion, and outputting the power adjusting electric signal and the phase adjusting electric signal to the optical adjusting unit. The power adjustment electrical signal is used for performing power adjustment on a second branch wavelength division signal obtained by wavelength division of the acquired optical signal to be processed during next optical carrier suppression modulation processing, and the phase adjustment electrical signal is used for performing phase adjustment on a second branch wavelength division signal obtained by wavelength division of the acquired optical signal to be processed during next optical carrier suppression modulation processing.

Optionally, in a possible implementation manner of the second aspect, the light adjusting unit includes a power adjusting unit and a phase adjusting unit. The output end of the first coupler is connected with the input end of the power adjusting unit, the output end of the power adjusting unit is connected with the input end of the phase adjusting unit, and the output end of the phase adjusting unit is connected with the input end of the second coupler. And the power adjusting unit is used for adjusting the power of the second branch wave division signal output by the first coupler and outputting the second branch wave division signal after power adjustment to the phase adjusting unit. And the phase adjusting unit is used for performing phase adjustment on the power-adjusted second branch wave division signal output by the power adjusting unit to obtain a compensation optical carrier and outputting the compensation optical carrier to the second coupler.

Optionally, in a possible implementation manner of the second aspect, the light adjusting unit includes a power adjusting unit and a phase adjusting unit. The output end of the first coupler is connected with the input end of the phase adjusting unit, the output end of the phase adjusting unit is connected with the input end of the power adjusting unit, and the output end of the power adjusting unit is connected with the input end of the second coupler. And the phase adjusting unit is used for performing phase adjustment on the second branch wave division signal output by the first coupler and outputting the second branch wave division signal after phase adjustment to the power adjusting unit. And the power adjusting unit is used for adjusting the power of the second branch wave division signal output by the phase adjusting unit after the phase adjustment to obtain a compensation optical carrier and outputting the compensation optical carrier to the second coupler.

Optionally, in a possible implementation manner of the second aspect, the power adjusting unit includes an adjustable attenuator or a mach-zehnder modulator.

Optionally, in a possible implementation manner of the second aspect, the carrier rejection modulator comprises a mach-zehnder modulator or an IQ modulator.

In a third aspect, an embodiment of the present application provides an apparatus for optical carrier suppression modulation, including: the device comprises a polarization beam splitter, a polarization beam combiner and two modulation units. The input end of the modulation unit is connected with the output end of the polarization beam splitter, and the output end of the modulation unit is connected with the input end of the polarization beam combiner. The modulation unit includes: the optical modulator comprises a first coupler, a second coupler, a carrier rejection modulator and an optical adjusting unit. The output end of the first coupler is respectively connected with the input end of the carrier suppression modulator and the input end of the light adjusting unit, the output end of the carrier suppression modulator and the output end of the light adjusting unit are respectively connected with the input end of the second coupler, the input end of the first coupler serves as the input end of the modulating unit, and the output end of the second coupler serves as the output end of the modulating unit. The polarization beam splitter is used for receiving the dual-polarization optical signals, performing polarization beam splitting on the dual-polarization optical signals to obtain two single-polarization optical signals with vertical polarization directions, and outputting the two single-polarization optical signals with the vertical polarization directions to the two modulation units as optical signals to be processed respectively. The first coupler is used for receiving an optical signal to be processed, splitting the optical signal to be processed to obtain a first branch split signal and a second branch split signal, outputting the first branch split signal to the carrier suppression modulator, and outputting the second branch split signal to the optical adjusting unit. And the carrier suppression modulator is used for carrying out optical carrier suppression modulation on the first branch wave-splitting signal output by the first coupler to obtain a first modulated optical carrier, and outputting the first modulated optical carrier to the second coupler, wherein the first modulated optical carrier comprises an optical carrier which is not suppressed. And the optical adjusting unit is used for carrying out power adjustment and phase adjustment on the second branch wave division signal output by the first coupler to obtain a compensation optical carrier, outputting the compensation optical carrier to the second coupler, and the compensation optical carrier is used for interfering with the first modulation optical carrier to offset the optical carrier which is not inhibited. And the second coupler is used for combining the first modulated optical carrier output by the carrier suppression modulator and the compensation optical carrier output by the optical adjusting unit to obtain a second modulated optical carrier and outputting the second modulated optical carrier. And the polarization light combiner is used for polarization light combination of the second modulated light carriers corresponding to the two single-polarization light signals with the vertical polarization directions respectively to obtain a third modulated light carrier and outputting the third modulated light carrier.

Optionally, in a possible implementation manner of the third aspect, the modulation unit further includes a feedback unit. The input end of the feedback unit is connected with the output end of the second coupler, and the output end of the feedback unit is connected with the input end of the light adjusting unit. The feedback unit is used for: performing photoelectric conversion on the second modulated optical carrier output by the second coupler after the last optical carrier suppression modulation processing, and detecting whether the second modulated optical carrier output by the second coupler after the last optical carrier suppression modulation processing also comprises an optical carrier which is not suppressed; and if the second modulated optical carrier output by the second coupler after the last optical carrier suppression modulation processing also comprises the optical carrier which is not suppressed, generating a power adjustment electric signal and a phase adjustment electric signal according to the second modulated optical carrier output by the second coupler after the last optical carrier suppression modulation processing after photoelectric conversion, and outputting the power adjustment electric signal and the phase adjustment electric signal to the optical adjustment unit. Correspondingly, the light adjusting unit is specifically configured to: and performing power adjustment on the second branch wave division signal according to the power adjustment electric signal output by the feedback unit, and performing phase adjustment on the second branch wave division signal according to the phase adjustment electric signal output by the feedback unit to obtain a compensation optical carrier.

Optionally, in a possible implementation manner of the third aspect, a feedback unit is further included. The input end of the feedback unit is connected with the output end of the second coupler, and the output end of the feedback unit is connected with the input end of the light adjusting unit. The feedback unit is used for: the second modulated optical carrier output by the second coupler is photoelectrically converted, and whether the second modulated optical carrier further includes an optical carrier which is not suppressed is detected. And if the second modulated optical carrier also comprises an optical carrier which is not inhibited, generating a power adjusting electric signal and a phase adjusting electric signal according to the second modulated optical carrier after photoelectric conversion, and outputting the power adjusting electric signal and the phase adjusting electric signal to the optical adjusting unit. The power adjustment electrical signal is used for performing power adjustment on a second branch wavelength division signal obtained by wavelength division of the acquired optical signal to be processed during next optical carrier suppression modulation processing, and the phase adjustment electrical signal is used for performing phase adjustment on a second branch wavelength division signal obtained by wavelength division of the acquired optical signal to be processed during next optical carrier suppression modulation processing.

Optionally, in a possible implementation manner of the third aspect, the light adjusting unit includes a power adjusting unit and a phase adjusting unit. The output end of the first coupler is connected with the input end of the power adjusting unit, the output end of the power adjusting unit is connected with the input end of the phase adjusting unit, and the output end of the phase adjusting unit is connected with the input end of the second coupler. And the power adjusting unit is used for adjusting the power of the second branch wave division signal output by the first coupler and outputting the second branch wave division signal after power adjustment to the phase adjusting unit. And the phase adjusting unit is used for performing phase adjustment on the power-adjusted second branch wave division signal output by the power adjusting unit to obtain a compensation optical carrier and outputting the compensation optical carrier to the second coupler.

Optionally, in a possible implementation manner of the third aspect, the light adjusting unit includes a power adjusting unit and a phase adjusting unit. The output end of the first coupler is connected with the input end of the phase adjusting unit, the output end of the phase adjusting unit is connected with the input end of the power adjusting unit, and the output end of the power adjusting unit is connected with the input end of the second coupler. And the phase adjusting unit is used for performing phase adjustment on the second branch wave division signal output by the first coupler and outputting the second branch wave division signal after phase adjustment to the power adjusting unit. And the power adjusting unit is used for adjusting the power of the second branch wave division signal output by the phase adjusting unit after the phase adjustment to obtain a compensation optical carrier and outputting the compensation optical carrier to the second coupler.

Optionally, in a possible implementation manner of the third aspect, the power adjusting unit includes an adjustable attenuator or a mach-zehnder modulator.

Optionally, in a possible implementation manner of the third aspect, the carrier rejection modulator includes a mach-zehnder modulator or an IQ modulator.

With reference to the first aspect and the possible embodiments of the first aspect, the second aspect and the possible embodiments of the second aspect, and the third aspect and the possible embodiments of the third aspect, the splitting ratio of the first tributary split signal is greater than the splitting ratio of the second tributary split signal, and the combined optical ratio of the first modulated optical carrier is greater than the combined optical ratio of the compensating optical carrier.

In a fourth aspect, an embodiment of the present application provides a storage medium, including: a readable storage medium and a computer program for implementing the methods provided by the various embodiments of the first aspect.

In a fifth aspect, the present application provides a program product including a computer program (i.e., executing instructions), the computer program being stored in a readable storage medium. The computer program may be read by at least one processor of an apparatus for optical carrier suppression modulation, and execution of the computer program by the at least one processor causes the apparatus to perform the methods provided by the various embodiments of the first aspect.

A sixth aspect of the present application provides a chip, comprising: the system comprises at least one communication interface, at least one processor and at least one memory, wherein the communication interface, the memory and the processor are interconnected through a bus, and the processor calls a computer program stored in the memory to execute the method provided by the various embodiments of the first aspect.

The embodiment of the application provides a method and a device for optical carrier suppression modulation, two optical splitting branches can be obtained by splitting an input optical signal, or a new optical splitting branch is introduced. One of the light splitting branches carries out optical carrier suppression modulation processing. After the power adjustment and the phase adjustment are carried out on the new light splitting branch, the principle of destructive interference of light is utilized, the optical carrier which is not suppressed after the optical carrier suppression modulation processing is greatly suppressed, and the performance of the optical carrier suppression modulation is improved.

Drawings

Fig. 1 is a flowchart of a method for optical carrier suppression modulation according to an embodiment of the present application;

fig. 2 is a flowchart of a method for optical carrier suppression modulation according to a second embodiment of the present application;

fig. 3 is a schematic structural diagram of an apparatus for optical carrier suppression modulation according to an embodiment of the present application;

FIG. 4 is a schematic structural diagram of one structure of the adjusting unit in FIG. 3;

FIG. 5 is a schematic structural diagram of another structure of the adjustment unit in FIG. 3;

fig. 6 is a schematic structural diagram of an optical carrier suppression modulation apparatus according to a second embodiment of the present application.

Detailed Description

Fig. 1 is a flowchart of a method for optical carrier suppression modulation according to an embodiment of the present application. The implementation subject of the method for optical carrier suppression modulation provided by this embodiment may be an apparatus for optical carrier suppression modulation, and may be applied to a scenario in which optical carrier suppression modulation is performed on a single-polarization optical signal. As shown in fig. 1, the method for optical carrier suppression modulation provided in this embodiment may include:

s101, obtaining an optical signal to be processed, and splitting the optical signal to be processed to obtain a first branch split signal and a second branch split signal.

The optical signal to be processed is a single-polarization optical signal.

Specifically, the optical signal to be processed is split to obtain the optical signals of two branches. The optical signals of the two branches may then be processed separately. In this embodiment, the optical signals of the two branches are referred to as a first branch wavelength division signal and a second branch wavelength division signal, respectively. Note that the present embodiment does not limit names of the optical signals of the two branches.

The first branch wave splitting signal and the second branch wave splitting signal respectively correspond to a splitting ratio. The spectral ratio is a ratio of the optical power of the separated light to the total optical power before the light is split. In this embodiment, the splitting ratio of the first branch demultiplexed signal refers to a ratio of the optical power of the first branch demultiplexed signal to the optical power of the optical signal to be processed. The splitting ratio of the second branch wavelength division signal is the ratio of the optical power of the second branch wavelength division signal to the optical power of the optical signal to be processed. The embodiment of the application does not limit the specific numerical values of the splitting ratios respectively corresponding to the first branch splitting signal and the second branch splitting signal, and can be related to the subsequent processing of the first branch splitting signal and the second branch splitting signal. That is, the splitting ratio of the first branch split signal may be greater than, equal to, or less than the splitting ratio of the second branch split signal.

S102, carrying out optical carrier suppression modulation on the first branch wave division signal to obtain a first modulation optical carrier, and carrying out power adjustment and phase adjustment on the second branch wave division signal to obtain a compensation optical carrier.

Wherein the first modulated optical carrier comprises an unsuppressed optical carrier, and the compensating optical carrier is configured to interfere with the first modulated optical carrier to cancel the unsuppressed optical carrier.

Specifically, the optical carrier suppression modulation processing is performed on the first branch split-wave signal to obtain a first modulated optical carrier. In general, the optical carrier cannot be completely suppressed after the optical carrier suppression modulation, that is, the first modulated optical carrier may include a residual optical carrier that is not suppressed. This residual optical carrier occupies power, resulting in wasted power. The first branch wavelength division signal and the second branch wavelength division signal are obtained by splitting the light signal to be processed, so that the first branch wavelength division signal and the second branch wavelength division signal are coherent light. That is, the second branch demultiplexed signal and the residual optical carrier that is not suppressed are coherent light. And performing power adjustment and phase adjustment on the second branch wave division signal to obtain a compensation optical carrier, so that the phase of the compensation optical carrier is opposite to that of the residual optical carrier, and the power of the compensation optical carrier corresponds to that of the residual optical carrier, namely, the residual optical carrier can be further inhibited by destructively interfering the compensation optical carrier and the residual optical carrier, and the performance of optical carrier inhibition modulation is improved.

It should be noted that, in this embodiment, a specific implementation of the optical carrier suppression modulation is not limited, and any conventional optical carrier suppression modulation method implemented by a modulation device, a modulator, and a modulation module may be used. For example, the optical carrier rejection modulation may be realized using a mach-zehnder modulator or an IQ modulator.

The power adjustment and the phase adjustment of the second branch wavelength division signal can be realized in various ways. For example, a fixed parameter adjustment manner is adopted according to the preset value of power adjustment and the preset value of phase adjustment. The power adjustment preset value may be set according to a factory value of a device that implements optical carrier suppression modulation. The phase adjustment preset value may be set according to temperature. Alternatively, the power adjustment preset value and the phase adjustment preset value may be obtained through repeated experiments according to the actually adopted optical carrier rejection modulator, power adjuster and phase adjuster. For another example, the power adjustment and the phase adjustment may be adjustable in a parameter adjustable manner.

Optionally, the splitting ratio of the first branch splitting signal is greater than the splitting ratio of the second branch splitting signal.

The optical carrier suppression modulation processing is carried out on the first branch wave-splitting signal, and the power adjustment and phase adjustment processing is carried out on the second branch wave-splitting signal, so that the destructive interference is carried out on the optical carrier which is not suppressed after the optical carrier suppression modulation is carried out on the first branch wave-splitting signal. Therefore, the splitting ratio of the first branch splitting signal is larger than that of the second branch splitting signal, most of power of the optical signal to be processed can be reserved in the first branch splitting signal, and the power utilization rate is improved.

S103, combining the first modulation optical carrier and the compensation optical carrier to obtain a second modulation optical carrier.

Specifically, the compensation optical carrier and the residual optical carrier that may be included in the first modulated optical carrier are coherent light, and the compensation optical carrier is used to destructively interfere with the residual optical carrier. Therefore, the first modulated optical carrier and the compensation optical carrier are combined to cancel out the residual optical carrier. The obtained second modulated optical carrier will not contain the optical carrier that is not suppressed, or the obtained second modulated optical carrier will have a substantially reduced number of optical carriers that are not suppressed. The performance of optical carrier suppression modulation is improved, and further the signal transmission performance is improved.

The first modulated optical carrier and the compensation optical carrier respectively correspond to a light combination ratio. The light combination ratio is a ratio of the optical power of the combined light to the total optical power of the combined light. The light combination ratio corresponds to the light splitting ratio. In this embodiment, the combined optical ratio of the first modulated optical carrier refers to a ratio of the optical power of the first modulated optical carrier to the optical power of the second modulated optical carrier. The combined optical ratio of the compensated optical carrier is the ratio of the optical power of the compensated optical carrier to the optical power of the second modulated optical carrier. The embodiment of the present application does not limit the specific numerical values of the light combination ratios respectively corresponding to the first modulated optical carrier and the compensated optical carrier. That is, the split ratio of the first modulated optical carrier may be greater than, equal to, or less than the split ratio of the compensating optical carrier.

Optionally, the combined optical ratio of the first modulated optical carrier is greater than the combined optical ratio of the compensated optical carrier.

Since the first modulated optical carrier is obtained by subjecting the first branch demultiplexed signal to the optical carrier rejection modulation process, there is a small portion of the remaining optical carrier contained therein that is not rejected. The compensation optical carrier is obtained after the power adjustment and the phase adjustment of the second branch wave division signal, and aims to destructively interfere with the residual optical carrier which is not suppressed in the first modulation optical carrier. Therefore, the combined optical ratio of the first modulated optical carrier is set to be larger than that of the compensation optical carrier, most of power of the first modulated optical carrier can be reserved in the second modulated optical carrier, and the power utilization rate is improved.

Optionally, the splitting ratios respectively corresponding to the first branch splitting signal and the second branch splitting signal, and the combining ratios respectively corresponding to the first modulated optical carrier and the compensated optical carrier may be set in a matching manner, so as to implement interference between the compensated optical carrier and the first modulated optical carrier to cancel the optical carrier that is not suppressed in the first modulated optical carrier. For example, the splitting ratio of the first branch split signal is equal to the combined optical ratio of the first modulated optical carrier. For another example, the splitting ratio of the first branch split signal is greater than the combining ratio of the first modulated optical carrier.

It can be seen that, the method for optical carrier suppression modulation provided in this embodiment performs optical carrier suppression modulation on a single-polarization optical signal. Two optical splitting branches can be obtained by splitting the input single-polarization optical signal, or a new optical splitting branch is introduced. One of the light splitting branches carries out optical carrier suppression modulation processing. After the power adjustment and the phase adjustment are carried out on the new light splitting branch, the principle of destructive interference of light is utilized, the optical carrier which is not suppressed after the optical carrier suppression modulation processing is greatly suppressed, the extinction ratio of the optical carrier suppression modulator is enlarged, and the transmission performance of the system is improved. The method for suppressing and modulating the optical carrier provided by the embodiment has the advantages of simple scheme, easy implementation and strong expandability, and is applicable to scenes needing to suppress the carrier.

It should be noted that the transmission and modulation of light is an ongoing process. The above-mentioned processes of S101 to S103 may be referred to as a primary optical carrier suppression modulation process, that is, a process from the acquisition of the optical signal to be processed to the acquisition of the second modulated optical carrier is referred to as a primary optical carrier suppression modulation process. The three times of optical carrier suppression modulation processing performed consecutively in time may be sequentially referred to as: last optical carrier suppression modulation processing, current optical carrier suppression modulation processing, and next optical carrier suppression modulation processing.

Optionally, before S101, the method for optical carrier suppression modulation provided in this embodiment may further include:

and performing photoelectric conversion on the second modulated optical carrier obtained after the last optical carrier suppression modulation processing, and detecting whether the second modulated optical carrier obtained after the last optical carrier suppression modulation processing still comprises the optical carrier which is not suppressed.

And if the second modulated optical carrier obtained after the last optical carrier suppression modulation processing also comprises the optical carrier which is not suppressed, generating a power adjustment electric signal and a phase adjustment electric signal according to the second modulated optical carrier obtained after the last optical carrier suppression modulation processing after photoelectric conversion.

Correspondingly, in S102, performing power adjustment and phase adjustment on the second branch demultiplexed optical signal to obtain a compensated optical carrier may include:

and carrying out power adjustment on the second branch wave division signal according to the power adjustment electric signal, and carrying out phase adjustment on the second branch wave division signal according to the phase adjustment electric signal to obtain a compensation optical carrier.

Specifically, the process from S101 to S103 may be referred to as the present optical carrier suppression modulation process, and the previous optical carrier suppression modulation process may be performed before the present optical carrier suppression modulation process. After the last optical carrier suppression modulation processing, the second modulated optical carrier after the last optical carrier suppression modulation processing is obtained. Through destructive interference of light, there may still be optical carriers in the second modulated optical carrier that have not been suppressed. After performing the photoelectric conversion on the second modulated optical carrier, if it is detected that the second modulated optical carrier further includes an optical carrier that is not suppressed, a feedback electrical signal may be generated according to the second modulated optical carrier after the photoelectric conversion, specifically including a power adjustment electrical signal and a phase adjustment electrical signal, for correcting power adjustment and phase adjustment in the current optical carrier suppression modulation process. Namely, during the current optical carrier suppression modulation processing, the power adjustment is performed on the second branch wavelength division signal according to the power adjustment electrical signal, and the phase adjustment is performed on the second branch wavelength division signal according to the phase adjustment electrical signal, so as to obtain the compensated optical carrier.

Therefore, by setting a feedback mechanism, the current optical carrier suppression modulation can be corrected according to the result of the previous optical carrier suppression modulation. Therefore, the destructive interference effect of light is improved, the optical carrier which is not suppressed after the optical carrier suppression modulation is further suppressed, and the performance of the optical carrier suppression modulation is improved.

Optionally, the method for optical carrier suppression modulation provided in this embodiment may further include:

the second modulated optical carrier is photoelectrically converted, and whether the second modulated optical carrier further includes an optical carrier that is not suppressed is detected.

And if the second modulated optical carrier also comprises the optical carrier which is not inhibited, generating a power adjusting electric signal and a phase adjusting electric signal according to the second modulated optical carrier after the photoelectric conversion. The power adjustment electrical signal is used for performing power adjustment on a second branch wavelength division signal obtained by wavelength division of the acquired optical signal to be processed during next optical carrier suppression modulation processing, and the phase adjustment electrical signal is used for performing phase adjustment on a second branch wavelength division signal obtained by wavelength division of the acquired optical signal to be processed during next optical carrier suppression modulation processing.

Specifically, the process from S101 to S103 may be referred to as the present optical carrier suppression modulation process, and after the present optical carrier suppression modulation process, the next optical carrier suppression modulation process is performed. After the current optical carrier suppression modulation processing, a second modulated optical carrier after the current optical carrier suppression modulation processing is obtained. Through destructive interference of light, there may still be optical carriers in the second modulated optical carrier that have not been suppressed. After performing the photoelectric conversion on the second modulated optical carrier, if it is detected that the second modulated optical carrier further includes an optical carrier that is not suppressed, a feedback electrical signal may be generated according to the second modulated optical carrier after the photoelectric conversion, specifically including a power adjustment electrical signal and a phase adjustment electrical signal, for correcting power adjustment and phase adjustment in the next optical carrier suppression modulation process. Namely, when the optical carrier suppression modulation processing is performed next time, the power adjustment is performed on the second branch wavelength division signal obtained by splitting the newly obtained optical signal to be processed according to the power adjustment electrical signal, and the phase adjustment is performed on the second branch wavelength division signal obtained by splitting the newly obtained optical signal to be processed according to the phase adjustment electrical signal.

Therefore, by setting a feedback mechanism, the next optical carrier suppression modulation can be corrected according to the result of the current optical carrier suppression modulation. Therefore, the destructive interference effect of light is improved, the optical carrier which is not suppressed after the optical carrier suppression modulation is further suppressed, and the performance of the optical carrier suppression modulation is improved.

The embodiment of the application provides a method for suppressing and modulating an optical carrier, which comprises the following steps: the method comprises the steps of receiving an optical signal to be processed, splitting the optical signal to be processed to obtain a first branch split signal and a second branch split signal, carrying out optical carrier suppression modulation on the first branch split signal to obtain a first modulation optical carrier, carrying out power adjustment and phase adjustment on the second branch split signal to obtain a compensation optical carrier, and combining the first modulation optical carrier and the compensation optical carrier to obtain a second modulation optical carrier. The method for optical carrier suppression modulation provided by the embodiment of the application performs optical carrier suppression modulation on a single-polarization optical signal, and by introducing a new light splitting branch and using the principle of destructive interference of light, optical carriers which are not suppressed after optical carrier suppression modulation processing are greatly suppressed, so that the signal modulation quality is improved, and the transmission performance of a system is improved.

Fig. 2 is a flowchart of a method for optical carrier suppression modulation according to a second embodiment of the present application. The implementation subject of the method for optical carrier suppression modulation provided by this embodiment may be an apparatus for optical carrier suppression modulation. On the basis of the embodiment shown in fig. 1, the method can be applied to a scenario of performing optical carrier rejection modulation on a dual-polarization optical signal. As shown in fig. 2, the method for optical carrier suppression modulation according to this embodiment may include:

s201, receiving the dual-polarization optical signal.

S202, carrying out polarization beam splitting on the dual-polarization optical signals to obtain two single-polarization optical signals with vertical polarization directions, wherein the two single-polarization optical signals with the vertical polarization directions are respectively used as optical signals to be processed.

Specifically, for a dual-polarization optical signal, polarization splitting is performed first to obtain two single-polarization optical signals. And then, carrying out optical carrier suppression modulation processing on each single-polarization optical signal.

S203, for each optical signal to be processed, splitting the optical signal to be processed to obtain a first branch split signal and a second branch split signal.

The optical signal to be processed is a single-polarization optical signal.

S204, carrying out optical carrier suppression modulation on the first branch wave-splitting signal to obtain a first modulated optical carrier, and carrying out power adjustment and phase adjustment on the second branch wave-splitting signal to obtain a compensated optical carrier.

S205, combining the first modulation optical carrier and the compensation optical carrier to obtain a second modulation optical carrier.

It should be noted that the technical principle and the technical effect of S203 to S205 are similar to those of S101 to S103 in the embodiment shown in fig. 1, and are not described herein again.

And S206, polarizing and combining the second modulated optical carriers corresponding to the two single-polarized optical signals with the vertical polarization directions respectively to obtain a third modulated optical carrier.

Specifically, for each single-polarization optical signal obtained after polarization splitting of the dual-polarization optical signal, the corresponding second modulated optical carrier can be obtained after the processing of S203 to S205. And polarizing and combining the second modulated optical carriers corresponding to the two single-polarized optical signals respectively to obtain a third modulated optical carrier subjected to optical carrier suppression modulation.

Optionally, before S203, the method for optical carrier suppression modulation provided in this embodiment may further include:

Correspondingly, in S204, performing power adjustment and phase adjustment on the second branch demultiplexed optical signal to obtain a compensated optical carrier, including:

The embodiment of the application provides a method for suppressing and modulating an optical carrier, which comprises the following steps: receiving dual-polarization optical signals, performing polarization splitting on the dual-polarization optical signals to obtain two single-polarization optical signals with vertical polarization directions, wherein the two single-polarization optical signals with the vertical polarization directions are respectively used as optical signals to be processed, splitting the optical signals to be processed to obtain a first branch split signal and a second branch split signal, performing optical carrier suppression modulation on the first branch split signal to obtain a first modulated optical carrier, performing power adjustment and phase adjustment on the second branch split signal to obtain a compensated optical carrier, combining the first modulated optical carrier and the compensated optical carrier to obtain a second modulated optical carrier, and performing polarization combining on the second modulated optical carrier corresponding to the two single-polarization optical signals with the vertical polarization directions to obtain a third modulated optical carrier. The method for optical carrier suppression modulation provided by the embodiment of the application performs optical carrier suppression modulation on dual-polarization optical signals, and by introducing a new light splitting branch and using the principle of destructive interference of light, optical carriers which are not suppressed after optical carrier suppression modulation processing are greatly suppressed, so that the signal modulation quality is improved, and the transmission performance of a system is improved.

Fig. 3 is a schematic structural diagram of an apparatus for optical carrier suppression modulation according to an embodiment of the present application. The apparatus for optical carrier suppression modulation provided in this embodiment is used to perform the method for optical carrier suppression modulation provided in the embodiment shown in fig. 1. As shown in fig. 3, the apparatus for optical carrier suppression modulation provided in this embodiment may include: a first coupler 11, a second coupler 12, a carrier rejection modulator 13, and an optical adjustment unit 14.

The output end of the first coupler 11 is connected to the input end of the carrier rejection modulator 13 and the input end of the light adjusting unit 14, and the output end of the carrier rejection modulator 13 and the output end of the light adjusting unit 14 are both connected to the input end of the second coupler 12.

The first coupler 11 is configured to receive an optical signal to be processed, split the optical signal to be processed to obtain a first branch split signal and a second branch split signal, output the first branch split signal to the carrier suppression modulator 13, and output the second branch split signal to the optical adjusting unit 14. The optical signal to be processed is a single-polarization optical signal.

And a carrier rejection modulator 13, configured to perform optical carrier rejection modulation on the first branch split-wave signal output by the first coupler 11 to obtain a first modulated optical carrier, and output the first modulated optical carrier to the second coupler 12, where the first modulated optical carrier includes an optical carrier that is not rejected.

And an optical adjustment unit 14, configured to perform power adjustment and phase adjustment on the second branch wavelength division signal output by the first coupler 11 to obtain a compensated optical carrier, and output the compensated optical carrier to the second coupler 12, where the compensated optical carrier is used to interfere with the first modulated optical carrier to cancel the optical carrier that is not suppressed.

The second coupler 12 is configured to combine the first modulated optical carrier output by the carrier suppression modulator 13 and the compensated optical carrier output by the optical adjusting unit 14 to obtain a second modulated optical carrier, and output the second modulated optical carrier.

It should be noted that, in this embodiment, implementation manners of the first coupler 11 and the second coupler 12 are not limited, and the first coupler and the second coupler may be implemented by using existing types and types of couplers as long as light splitting and light combining can be implemented.

It should be noted that the implementation of the carrier suppression modulator 13 in the present embodiment is not limited, and the present embodiment may be implemented by using a conventional carrier suppression modulator as long as the optical carrier suppression modulation can be implemented. For example, the carrier-rejection modulator 13 may be a mach-zehnder modulator or an IQ modulator.

It should be noted that the implementation manner of the light adjusting unit 14 is not limited in this embodiment, and the light adjusting unit may be implemented by using an existing device that can implement power adjustment and phase adjustment. The power adjustment and the phase adjustment can be realized by an optical adjustment unit with an integral structure, or by an optical adjustment unit with a split structure.

Optionally, fig. 4 is a schematic structural diagram of a structure of the adjusting unit in fig. 3. As shown in fig. 4, the light adjusting unit 14 includes a power adjusting unit 141 and a phase adjusting unit 142.

The output terminal of the first coupler 11 is connected to the input terminal of the power adjusting unit 141, the output terminal of the power adjusting unit 141 is connected to the input terminal of the phase adjusting unit 142, and the output terminal of the phase adjusting unit 142 is connected to the input terminal of the second coupler 12.

The power adjusting unit 141 is configured to perform power adjustment on the second branch wavelength division signal output by the first coupler 11, and output the power-adjusted second branch wavelength division signal to the phase adjusting unit 142.

The phase adjusting unit 142 is configured to perform phase adjustment on the power-adjusted second branch wavelength division signal output by the power adjusting unit 141 to obtain a compensated optical carrier, and output the compensated optical carrier to the second coupler 12.

Optionally, fig. 5 is a schematic structural diagram of another structure of the adjusting unit in fig. 3. As shown in fig. 5, the light adjusting unit 14 includes a power adjusting unit 141 and a phase adjusting unit 142.

The output terminal of the first coupler 11 is connected to the input terminal of the phase adjusting unit 142, the output terminal of the phase adjusting unit 142 is connected to the input terminal of the power adjusting unit 141, and the output terminal of the power adjusting unit 141 is connected to the input terminal of the second coupler 12.

The phase adjusting unit 142 is configured to perform phase adjustment on the second branch wavelength division signal output by the first coupler 11, and output the phase-adjusted second branch wavelength division signal to the power adjusting unit 141.

The power adjusting unit 141 is configured to perform power adjustment on the phase-adjusted second branch wavelength division signal output by the phase adjusting unit 142 to obtain a compensated optical carrier, and output the compensated optical carrier to the second coupler 12.

Optionally, the power adjusting unit 141 includes an adjustable attenuator or a mach-zehnder modulator.

When the power adjustment is realized through the Mach-Zehnder modulator, the radio frequency interface of the Mach-Zehnder modulator does not need to be externally connected with an electric signal, and only the bias point of the Mach-Zehnder modulator needs to be adjusted so as to realize the power adjustment.

Optionally, the apparatus for suppressing and modulating an optical carrier provided in this embodiment may further include a feedback unit 15. An input of the feedback unit 15 is connected to an output of the second coupler 12, and an output of the feedback unit 15 is connected to an input of the light adjusting unit 14.

The feedback unit 15 is configured to:

the second modulated optical carrier output by the second coupler 12 after the last optical carrier suppression modulation processing is subjected to photoelectric conversion, and whether the second modulated optical carrier output by the second coupler 12 after the last optical carrier suppression modulation processing still includes an optical carrier that is not suppressed is detected.

If the second modulated optical carrier output by the second coupler 12 after the last optical carrier suppression modulation processing still includes the optical carrier that is not suppressed, a power adjustment electrical signal and a phase adjustment electrical signal are generated according to the second modulated optical carrier output by the second coupler 12 after the last optical carrier suppression modulation processing after the photoelectric conversion, and the power adjustment electrical signal and the phase adjustment electrical signal are output to the optical adjustment unit 14.

Accordingly, the light adjusting unit 14 is specifically configured to:

the power adjustment is performed on the second branch of the demultiplexed signals according to the power adjustment electrical signal output by the feedback unit 15, and the phase adjustment is performed on the second branch of the demultiplexed signals according to the phase adjustment electrical signal output by the feedback unit 15, so as to obtain the compensated optical carrier.

The feedback unit 15 is configured to:

the second modulated optical carrier output by the second coupler 12 is photoelectrically converted, and it is detected whether the second modulated optical carrier further includes an optical carrier which is not suppressed.

If the second modulated optical carrier further includes an optical carrier that is not suppressed, a power adjustment electrical signal and a phase adjustment electrical signal are generated from the photoelectrically converted second modulated optical carrier, and the power adjustment electrical signal and the phase adjustment electrical signal are output to the optical adjustment unit 14. The power adjustment electrical signal is used for performing power adjustment on a second branch wavelength division signal obtained by wavelength division of the acquired optical signal to be processed during next optical carrier suppression modulation processing, and the phase adjustment electrical signal is used for performing phase adjustment on a second branch wavelength division signal obtained by wavelength division of the acquired optical signal to be processed during next optical carrier suppression modulation processing.

Alternatively, the feedback unit 15 may be implemented by a photodetector or a device having a photoelectric conversion function.

The apparatus for optical carrier suppression modulation provided in this embodiment is used to execute the method for optical carrier suppression modulation provided in the embodiment shown in fig. 1, and the technical principle and the technical effect are similar, which are not described herein again.

Fig. 6 is a schematic structural diagram of an optical carrier suppression modulation apparatus according to a second embodiment of the present application. The apparatus for optical carrier suppression modulation provided in this embodiment is configured to perform the method for optical carrier suppression modulation provided in the embodiment shown in fig. 1 or fig. 2. As shown in fig. 6, the apparatus for optical carrier suppression modulation provided in this embodiment may include: a polarization beam splitter 21, a polarization beam combiner 22 and two modulation units 23.

The input end of the modulation unit 23 is connected to the output end of the polarization beam splitter 21, and the output end of the modulation unit 23 is connected to the input end of the polarization beam combiner 22.

The modulation unit 23 includes: a first coupler 11, a second coupler 12, a carrier rejection modulator 13, and an optical adjustment unit 14. The output end of the first coupler 11 is connected to the input end of the carrier rejection modulator 13 and the input end of the light adjusting unit 14, the output end of the carrier rejection modulator 13 and the output end of the light adjusting unit 14 are both connected to the input end of the second coupler 12, the input end of the first coupler 11 serves as the input end of the modulating unit 23, and the output end of the second coupler 12 serves as the output end of the modulating unit 23.

The polarization beam splitter 21 is configured to receive the dual-polarization optical signal, perform polarization beam splitting on the dual-polarization optical signal to obtain two single-polarization optical signals with perpendicular polarization directions, and output the two single-polarization optical signals with perpendicular polarization directions as optical signals to be processed to the two modulation units 23, respectively.

The first coupler 11 is configured to receive an optical signal to be processed, split the optical signal to be processed to obtain a first branch split signal and a second branch split signal, output the first branch split signal to the carrier suppression modulator 13, and output the second branch split signal to the optical adjusting unit 14.

And the polarization light combiner 22 is configured to polarize and combine the second modulated light carriers corresponding to the two single-polarization light signals with the vertical polarization directions, obtain a third modulated light carrier, and output the third modulated light carrier.

It should be noted that, in this embodiment, implementation manners of the polarization beam splitter 21 and the polarization beam combiner 22 are not limited, and existing models and types of polarization beam splitters and polarization beam combiners may be adopted as long as polarization beam splitting and polarization beam combining can be achieved.

The modulation unit 23 provided in this embodiment is similar to the apparatus for suppressing and modulating optical carrier wave provided in the embodiment shown in fig. 3, and its technical principle and technical effect are similar, and are not described herein again.

Optionally, the modulation unit 23 further comprises a feedback unit (not shown). The input of the feedback unit is connected to the output of the second coupler 12, and the output of the feedback unit is connected to the input of the light adjusting unit 14.

The feedback unit is used for:

Accordingly, the light adjusting unit 14 is specifically configured to:

and performing power adjustment on the second branch wave division signal according to the power adjustment electric signal output by the feedback unit, and performing phase adjustment on the second branch wave division signal according to the phase adjustment electric signal output by the feedback unit to obtain a compensation optical carrier.

Optionally, the apparatus for suppressing and modulating an optical carrier provided in this embodiment may further include a feedback unit. The input of the feedback unit is connected to the output of the second coupler 12, and the output of the feedback unit is connected to the input of the light adjusting unit 14.

The feedback unit is used for:

Optionally, the light adjusting unit 14 includes a power adjusting unit and a phase adjusting unit.

The output end of the first coupler 11 is connected to the input end of the power adjusting unit, the output end of the power adjusting unit is connected to the input end of the phase adjusting unit, and the output end of the phase adjusting unit is connected to the input end of the second coupler 12.

And the power adjusting unit is configured to perform power adjustment on the second branch wavelength division signal output by the first coupler 11, and output the second branch wavelength division signal after power adjustment to the phase adjusting unit.

And the phase adjusting unit is configured to perform phase adjustment on the power-adjusted second branch wavelength division signal output by the power adjusting unit to obtain a compensated optical carrier, and output the compensated optical carrier to the second coupler 12.

The output end of the first coupler 11 is connected to the input end of the phase adjusting unit, the output end of the phase adjusting unit is connected to the input end of the power adjusting unit, and the output end of the power adjusting unit is connected to the input end of the second coupler 12.

And the phase adjusting unit is configured to perform phase adjustment on the second branch wavelength division signal output by the first coupler 11, and output the phase-adjusted second branch wavelength division signal to the power adjusting unit.

And the power adjusting unit is configured to perform power adjustment on the phase-adjusted second branch wavelength division signal output by the phase adjusting unit to obtain a compensated optical carrier, and output the compensated optical carrier to the second coupler 12.

Optionally, the power adjusting unit includes an adjustable attenuator or a mach-zehnder modulator.

Optionally, the carrier rejection modulator 13 includes a mach-zehnder modulator or an IQ modulator.

The apparatus for optical carrier suppression modulation provided in this embodiment is used to execute the method for optical carrier suppression modulation provided in the embodiment shown in fig. 1 or fig. 2, and its technical principle and technical effect are similar, and are not described herein again.

Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the embodiments of the present application, and are not limited thereto; although the embodiments of the present application have been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

A method of optical suppressed carrier modulation, comprising:

acquiring an optical signal to be processed, and splitting the optical signal to be processed to obtain a first branch split signal and a second branch split signal, wherein the optical signal to be processed is a single-polarization optical signal;

carrying out optical carrier suppression modulation on the first branch wave-splitting signal to obtain a first modulated optical carrier, and carrying out power adjustment and phase adjustment on the second branch wave-splitting signal to obtain a compensated optical carrier; wherein the first modulated optical carrier comprises an unsuppressed optical carrier, the compensating optical carrier to interfere with the first modulated optical carrier to cancel the unsuppressed optical carrier;

and combining the first modulated optical carrier and the compensation optical carrier to obtain a second modulated optical carrier.
The method of claim 1, further comprising:

performing photoelectric conversion on the second modulated optical carrier, and detecting whether the second modulated optical carrier further comprises an optical carrier which is not suppressed;

if the second modulated optical carrier also comprises an optical carrier which is not inhibited, generating a power adjusting electric signal and a phase adjusting electric signal according to the second modulated optical carrier after photoelectric conversion; the power adjustment electrical signal is used for performing power adjustment on a second branch wavelength division signal obtained by wavelength division of the acquired optical signal to be processed in next optical carrier suppression modulation processing, and the phase adjustment electrical signal is used for performing phase adjustment on a second branch wavelength division signal obtained by wavelength division of the acquired optical signal to be processed in next optical carrier suppression modulation processing.
The method of claim 1, wherein prior to receiving the optical signal to be processed, further comprising:

receiving a dual-polarization optical signal;

and carrying out polarization light splitting on the dual-polarization optical signal to obtain two single-polarization optical signals with vertical polarization directions, wherein the two single-polarization optical signals with the vertical polarization directions are respectively used as the optical signals to be processed.
The method of claim 3, further comprising:

and respectively carrying out polarization combination on the second modulated optical carriers corresponding to the two single-polarization optical signals with the vertical polarization directions to obtain a third modulated optical carrier.
The method of any one of claims 1 to 4, wherein the split ratio of the first branch demultiplexed signal is greater than the split ratio of the second branch demultiplexed signal.
The method of any of claims 1 to 4, wherein a combined optical ratio of the first modulated optical carrier is greater than a combined optical ratio of the compensated optical carrier.
An apparatus for optical carrier rejection modulation, comprising: a first coupler, a second coupler, a carrier rejection modulator and an optical adjustment unit;

the output end of the first coupler is respectively connected with the input end of the carrier suppression modulator and the input end of the light adjusting unit, and the output end of the carrier suppression modulator and the output end of the light adjusting unit are both connected with the input end of the second coupler;

the first coupler is used for receiving an optical signal to be processed, splitting the optical signal to be processed to obtain a first branch split signal and a second branch split signal, outputting the first branch split signal to the carrier suppression modulator, and outputting the second branch split signal to the optical adjusting unit; the optical signal to be processed is a single-polarization optical signal;

the carrier rejection modulator is configured to perform optical carrier rejection modulation on the first branch split-wave signal output by the first coupler to obtain a first modulated optical carrier, and output the first modulated optical carrier to the second coupler, where the first modulated optical carrier includes an optical carrier that is not rejected;

the optical adjusting unit is configured to perform power adjustment and phase adjustment on the second branch wavelength division signal output by the first coupler to obtain a compensated optical carrier, and output the compensated optical carrier to the second coupler, where the compensated optical carrier is configured to interfere with the first modulated optical carrier to cancel the optical carrier that is not suppressed;

the second coupler is configured to combine the first modulated optical carrier output by the carrier suppression modulator with the compensated optical carrier output by the optical adjustment unit to obtain a second modulated optical carrier, and output the second modulated optical carrier.
The apparatus of claim 7, further comprising a feedback unit; the input end of the feedback unit is connected with the output end of the second coupler, and the output end of the feedback unit is connected with the input end of the light adjusting unit;

the feedback unit is used for:

performing photoelectric conversion on the second modulated optical carrier output by the second coupler, and detecting whether the second modulated optical carrier further comprises an optical carrier which is not suppressed;

if the second modulated optical carrier further includes an optical carrier that is not suppressed, generating a power adjustment electrical signal and a phase adjustment electrical signal according to the photoelectrically converted second modulated optical carrier, and outputting the power adjustment electrical signal and the phase adjustment electrical signal to the optical adjustment unit; the power adjustment electrical signal is used for performing power adjustment on a second branch wavelength division signal obtained by wavelength division of the acquired optical signal to be processed in next optical carrier suppression modulation processing, and the phase adjustment electrical signal is used for performing phase adjustment on a second branch wavelength division signal obtained by wavelength division of the acquired optical signal to be processed in next optical carrier suppression modulation processing.
The apparatus of claim 7, wherein the light adjusting unit comprises a power adjusting unit and a phase adjusting unit;

the output end of the first coupler is connected with the input end of the power adjusting unit, the output end of the power adjusting unit is connected with the input end of the phase adjusting unit, and the output end of the phase adjusting unit is connected with the input end of the second coupler;

the power adjusting unit is configured to perform power adjustment on the second branch wavelength division signal output by the first coupler, and output the second branch wavelength division signal after power adjustment to the phase adjusting unit;

the phase adjustment unit is configured to perform phase adjustment on the power-adjusted second branch wavelength division signal output by the power adjustment unit to obtain the compensated optical carrier, and output the compensated optical carrier to the second coupler.
The apparatus of claim 7, wherein the light adjusting unit comprises a power adjusting unit and a phase adjusting unit;

the output end of the first coupler is connected with the input end of the phase adjusting unit, the output end of the phase adjusting unit is connected with the input end of the power adjusting unit, and the output end of the power adjusting unit is connected with the input end of the second coupler;

the phase adjusting unit is configured to perform phase adjustment on the second branch wavelength division signal output by the first coupler, and output the phase-adjusted second branch wavelength division signal to the power adjusting unit;

the power adjusting unit is configured to perform power adjustment on the phase-adjusted second branch wavelength division signal output by the phase adjusting unit to obtain the compensated optical carrier, and output the compensated optical carrier to the second coupler.
An arrangement according to claim 9 or 10, characterized in that the power adjusting unit comprises an adjustable attenuator or a mach-zehnder modulator.
The apparatus according to any of claims 7 to 11, wherein the carrier rejection modulator comprises a mach-zehnder modulator or an in-phase quadrature IQ modulator.
The apparatus of any one of claims 7 to 12, wherein the splitting ratio of the first branched sub-signal is greater than the splitting ratio of the second branched sub-signal.
The apparatus of any of claims 7 to 12, wherein a combined optical ratio of the first modulated optical carrier is greater than a combined optical ratio of the compensated optical carrier.
An apparatus for optical carrier rejection modulation, comprising: the device comprises a polarization beam splitter, a polarization beam combiner and two modulation units; the input end of the modulation unit is connected with the output end of the polarization beam splitter, and the output end of the modulation unit is connected with the input end of the polarization beam combiner;

the modulation unit includes: a first coupler, a second coupler, a carrier rejection modulator and an optical adjustment unit; the output end of the first coupler is respectively connected with the input end of the carrier suppression modulator and the input end of the light adjusting unit, the output end of the carrier suppression modulator and the output end of the light adjusting unit are both connected with the input end of the second coupler, the input end of the first coupler is used as the input end of the modulating unit, and the output end of the second coupler is used as the output end of the modulating unit;

the polarization beam splitter is used for receiving a dual-polarization optical signal, performing polarization beam splitting on the dual-polarization optical signal to obtain two single-polarization optical signals with vertical polarization directions, and outputting the two single-polarization optical signals with the vertical polarization directions to the two modulation units as optical signals to be processed respectively;

the first coupler is used for receiving an optical signal to be processed, splitting the optical signal to be processed to obtain a first branch split signal and a second branch split signal, outputting the first branch split signal to the carrier suppression modulator, and outputting the second branch split signal to the optical adjusting unit;

the carrier rejection modulator is configured to perform optical carrier rejection modulation on the first branch split-wave signal output by the first coupler to obtain a first modulated optical carrier, and output the first modulated optical carrier to the second coupler, where the first modulated optical carrier includes an optical carrier that is not rejected;

the optical adjusting unit is configured to perform power adjustment and phase adjustment on the second branch wavelength division signal output by the first coupler to obtain a compensated optical carrier, and output the compensated optical carrier to the second coupler, where the compensated optical carrier is configured to interfere with the first modulated optical carrier to cancel the optical carrier that is not suppressed;

the second coupler is configured to combine the first modulated optical carrier output by the carrier rejection modulator and the compensated optical carrier output by the optical adjusting unit to obtain a second modulated optical carrier, and output the second modulated optical carrier;

and the polarization light combiner is used for polarization light combination of second modulated light carriers corresponding to the two single-polarization light signals with the vertical polarization directions respectively to obtain a third modulated light carrier and outputting the third modulated light carrier.
The apparatus of claim 15, wherein the modulation unit further comprises a feedback unit; the input end of the feedback unit is connected with the output end of the second coupler, and the output end of the feedback unit is connected with the input end of the light adjusting unit;

the feedback unit is used for:

performing photoelectric conversion on the second modulated optical carrier output by the second coupler, and detecting whether the second modulated optical carrier further comprises an optical carrier which is not suppressed;

if the second modulated optical carrier further includes an optical carrier that is not suppressed, generating a power adjustment electrical signal and a phase adjustment electrical signal according to the photoelectrically converted second modulated optical carrier, and outputting the power adjustment electrical signal and the phase adjustment electrical signal to the optical adjustment unit; the power adjustment electrical signal is used for performing power adjustment on a second branch wavelength division signal obtained by wavelength division of the acquired optical signal to be processed in next optical carrier suppression modulation processing, and the phase adjustment electrical signal is used for performing phase adjustment on a second branch wavelength division signal obtained by wavelength division of the acquired optical signal to be processed in next optical carrier suppression modulation processing.
The apparatus of claim 15, wherein the light adjusting unit comprises a power adjusting unit and a phase adjusting unit;

the output end of the first coupler is connected with the input end of the power adjusting unit, the output end of the power adjusting unit is connected with the input end of the phase adjusting unit, and the output end of the phase adjusting unit is connected with the input end of the second coupler;

the power adjusting unit is configured to perform power adjustment on the second branch wavelength division signal output by the first coupler, and output the second branch wavelength division signal after power adjustment to the phase adjusting unit;

the phase adjustment unit is configured to perform phase adjustment on the power-adjusted second branch wavelength division signal output by the power adjustment unit to obtain the compensated optical carrier, and output the compensated optical carrier to the second coupler.
The apparatus of claim 15, wherein the light adjusting unit comprises a power adjusting unit and a phase adjusting unit;

the output end of the first coupler is connected with the input end of the phase adjusting unit, the output end of the phase adjusting unit is connected with the input end of the power adjusting unit, and the output end of the power adjusting unit is connected with the input end of the second coupler;

the phase adjusting unit is configured to perform phase adjustment on the second branch wavelength division signal output by the first coupler, and output the phase-adjusted second branch wavelength division signal to the power adjusting unit;

the power adjusting unit is configured to perform power adjustment on the phase-adjusted second branch wavelength division signal output by the phase adjusting unit to obtain a compensated optical carrier, and output the compensated optical carrier to the second coupler.
An arrangement according to claim 17 or 18, characterized in that the power adjusting unit comprises an adjustable attenuator or a mach-zehnder modulator.
The apparatus of any of claims 15 to 19, wherein the carrier-rejection modulator comprises a mach-zehnder modulator or an in-phase-quadrature IQ modulator.
The apparatus of any one of claims 15 to 20, wherein the splitting ratio of the first branched sub-signal is greater than the splitting ratio of the second branched sub-signal.
The apparatus of any of claims 15 to 20, wherein a combined optical ratio of the first modulated optical carrier is greater than a combined optical ratio of the compensated optical carrier.