CN115967450A - Wireless coherent optical communication link signal equalization system - Google Patents
Wireless coherent optical communication link signal equalization system Download PDFInfo
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- CN115967450A CN115967450A CN202211641356.4A CN202211641356A CN115967450A CN 115967450 A CN115967450 A CN 115967450A CN 202211641356 A CN202211641356 A CN 202211641356A CN 115967450 A CN115967450 A CN 115967450A
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Abstract
The invention discloses a wireless coherent optical communication link signal equalization system, and belongs to the technical field of wireless laser communication. The system comprises an optical antenna, an optical wavefront detector, an optical coupler, an optical mixer, a local oscillator laser source, an optical detector, an optical wavefront resolver, an optical signal demodulator and an optical signal demodulation controller. The invention adopts a space optical wavefront detection means to assist in realizing real-time optical wavefront phase noise perception and dynamic balance of a coherent optical communication link. The invention has low complexity, high automation degree, high response speed and easy realization.
Description
Technical Field
The invention relates to the technical field of wireless laser communication, in particular to a technology for realizing signal equalization of a wireless coherent optical link based on a digital signal processing method.
Background
The wireless coherent optical communication passes through an atmospheric channel, and a receiving end optical signal is influenced by the channel to generate space optical wavefront distortion, so that the receiving signal generates complex time-varying phase noise. This may affect wireless office communication, especially coherent wireless laser communication, and may further reduce mixing efficiency and communication quality, thereby affecting optical signal receiving and communication effects.
At present, for the influence of an atmospheric channel on wave front distortion of wireless optical communication, the current mainstream targeted optical communication channel repair means carries out wave front distortion repair based on optical means.
Disclosure of Invention
In view of the above, the present invention provides a wireless coherent optical communication link signal equalization system. The invention has the advantages of low complexity, high automation degree, high response speed and easy realization.
In order to achieve the purpose, the invention adopts the technical scheme that:
a wireless coherent optical communication link signal equalization system comprises an optical antenna, an optical wavefront detector, an optical coupler, an optical mixer, a local oscillator laser source, an optical detector, an optical wavefront resolver, an optical signal demodulator and an optical signal demodulation controller;
the optical antenna leads optical signals to fixed end faces of the optical wavefront detector and the optical coupler along designed angles after the optical signals are subjected to beam shaping, beam expanding, beam converging, beam splitting and filtering processing on an optical path;
the optical wavefront detector transmits detected wavefront information to the optical wavefront resolver through the communication interface; the optical wavefront resolver transmits the resolved wavefront phase distribution parameters to the optical signal demodulator through a communication interface; the communication interface is an optical fiber or electrical communication interface;
the optical mixer is respectively connected with the optical coupler, the local oscillator laser source and the optical detector through optical fibers; the optical coupler transmits the coupled optical signal to the optical mixer through an optical fiber; the local oscillator laser source transmits local oscillator light to the optical mixer through an optical fiber; the optical mixer mixes the received optical signal with the local oscillator light and outputs the mixed optical signal to the optical detector through the optical fiber; the optical fiber is a single-mode optical fiber or a single-mode polarization maintaining optical fiber;
the optical signal demodulation controller is connected with the optical wavefront solver, the optical signal demodulator and the local oscillator laser source through communication interfaces; the optical signal demodulation controller transmits the control signal to the optical wavefront resolver, the optical signal demodulator or the local oscillator laser source through the communication interface; and the optical signal demodulation controller receives a feedback signal from the optical wavefront solver, the optical signal demodulator or the local oscillator laser source through the communication interface.
Furthermore, the optical antenna has the functions of receiving optical signals from an external free space, and performing beam expanding, beam converging, beam shaping, beam splitting and filtering on the optical signals in the optical antenna; the optical antenna structure adopts a transmission type structure, a reflection type structure or a structure combining the transmission type structure and the reflection type structure;
the optical wavefront detector has the functions of distinguishing the optical wavefront distortion of the space light and outputting the wavefront distortion information of the space light;
the optical coupler has the function of optically coupling the space into the optical fiber;
the optical mixer has the function of mixing and outputting optical signals input through the optical fiber and local oscillator laser;
the local oscillator laser source is a monochromatic laser source with the same wavelength as or smaller wavelength difference with the incident space optical signal, and has the capacity of mixing with the incident optical signal;
the optical detector is used for detecting the intensity information of the optical signal, and the detection range of the optical detector covers the wavelength of incident light, the wavelength of a local oscillator light and the wavelength of a difference frequency signal light obtained by mixing the incident light and the local oscillator light; the working bandwidth of the optical detector exceeds the modulation bandwidth of the optical signal; the light detection can be a single detector or a balanced detector;
the optical wavefront resolver has an optical wavefront distortion phase distribution information resolving function;
the optical signal demodulator has the functions of power amplification, analog-to-digital conversion, filtering, equalization and demodulation processing on the optical signals after frequency mixing,
the optical signal demodulation controller has the functions of controlling the working state, the working temperature and the power supply of the optical signal demodulator, the optical wavefront solver, the local oscillator laser source.
Further, the specific process for implementing dynamic equalization of the optical communication link is as follows:
step 1, an optical antenna receives a wireless optical signal from a free space, and transmits the optical signal to an optical wavefront detector and an optical coupler after beam shaping, beam expanding, beam converging, light splitting and filtering processing;
step 2, the optical wavefront detector receives the optical signal which is processed by the optical antenna and then enters, and detects the wavefront distortion parameter of the optical signal; the optical wavefront detector transmits the detected wavefront distortion parameter of the optical signal to the optical wavefront resolver through the communication interface; the optical wavefront resolver resolves to obtain wavefront distortion phase distribution information of the optical signal; the optical wavefront resolver transmits wavefront distortion phase distribution information to the optical signal demodulator through the communication interface;
step 3, the optical coupler receives the space optical signal transmitted by the optical antenna and couples the space optical signal into the optical fiber; the optical coupler transmits the optical signal to the optical mixer through the optical fiber; the local oscillator laser source transmits the optical signal to the optical mixer through the optical fiber; the optical mixer mixes the optical signal and the local oscillator light and outputs the optical signal and the local oscillator light to the optical detector through the optical fiber; the optical detector outputs the converted electric signal to an optical signal demodulator;
step 4, after the optical signal demodulator receives the electric signal from the optical detector and the wavefront distortion phase distribution information from the optical wavefront resolver; the optical signal demodulator performs power amplification and analog-to-digital conversion on the electric signal and then converts the electric signal into a digital signal; the optical signal demodulator processes the digital signal according to the wavefront distortion phase distribution information, eliminates the phase noise influence generated by the wavefront distortion of the optical signal, and realizes the balanced demodulation of the optical signal.
Further, step 2 is executed in parallel with step 3.
Further, the optical signal demodulation controller receives working state information, working temperature information and power supply condition information from the optical signal demodulator, the optical wavefront resolver and the local oscillator laser source, generates a control instruction according to corresponding information, and forwards the control instruction to the corresponding working module.
Compared with the prior art, the invention has the following beneficial effects by the technical scheme:
the invention adopts a space optical wavefront detection means to assist in realizing real-time optical wavefront phase noise perception and dynamic balance of a coherent optical communication link. The invention has low complexity, high automation degree, high response speed and easy realization.
Drawings
FIG. 1 is a schematic diagram of the system connection of the present invention.
In the figure: 101 optical antenna, 102 optical wavefront detector, 103 optical coupler, 104 optical mixer, 105 local oscillator laser source, 106 optical detector, 107 optical wavefront resolver, 108 optical signal demodulator, 109 optical signal demodulation controller, 201 space optical path, 202 optical fiber, 203 communication interface.
Detailed Description
The technical solution of the present invention is further described with reference to the accompanying drawings and the detailed description.
A wireless coherent optical communication equalization system 100 mainly comprises a 101 optical antenna, a 102 optical wavefront sensor, a 103 optical coupler, a 104 optical mixer, a 105 local oscillator laser source, a 106 optical detector, a 107 optical wavefront resolver, a 108 optical signal demodulator and a 109 optical signal demodulation controller. Wherein optical signals mainly pass through two media, namely a 201 space optical path and a 202 optical fiber, and electrical signals and control signals mainly pass through a 203 communication interface.
The 101 optical antenna can guide optical signals to fixed end faces of 102 wavefront detectors and 103 optical couplers along a designed angle after necessary beam shaping, beam expanding, beam converging, beam splitting and filtering processing are carried out on the optical signals on a 201 spatial light path.
The 102 optical wavefront detector is connected with the 107 optical wavefront resolver through a 203 communication interface, and the 102 optical wavefront detector transmits detected wavefront information to the 107 optical wavefront resolver through the 203 communication interface. The 107 optical wavefront solver is connected with the 108 optical signal demodulator through a 203 communication interface, and the 107 optical wavefront solver transmits the solved wavefront phase distribution parameters to the 108 optical signal demodulator through the 203 communication interface. The 203 communication interface is an optical fiber or an electrical communication interface.
The 104 optical mixer is respectively connected with 103 optical coupler, 105 local oscillator laser source and 106 optical detector through 202 optical fiber. The 103 optical coupler transmits the coupled optical signal to the 104 optical mixer through the 202 optical fiber. 105 local oscillator laser source is transmitted to 104 optical mixer through 202 optical fiber. The optical mixer 104 mixes the received optical signal with the local oscillator light and outputs the mixed optical signal to the optical detector 106 through the optical fiber 202. The 202 optical fiber is a single-mode optical fiber or a single-mode polarization maintaining optical fiber.
Wherein 109 the optical signal demodulation controller is connected with 107 the optical wavefront solver, 108 the optical signal demodulator and 105 the local oscillator laser source through 203 communication interfaces. The 109 optical signal demodulation controller transmits the control signal to 107 optical wavefront solver or 108 optical signal demodulator or 105 local oscillator laser source via 203 communication interface. The 109 optical signal demodulation controller receives a feedback signal from 107 optical wavefront solver or 108 optical signal demodulator or 105 local oscillator laser source via 203 communication interface. The 203 communication interface is an optical fiber or an electrical communication interface.
As shown in fig. 1, the wireless coherent optical communication link signal equalization technology includes the following components:
the system comprises an optical antenna 101, an optical wavefront detector 102, an optical coupler 103, an optical mixer 104, a local oscillator laser source 105, an optical detector 106, an optical wavefront resolver 107, an optical signal demodulator 108 and an optical signal demodulation controller 109. The optical signals mainly pass through two media, namely a 201 space optical path and a 202 optical fiber, and the electrical signals and the control signals mainly pass through a 203 communication interface.
The wireless coherent optical communication link signal equalization technology specifically comprises the following working steps:
step 1, receiving and coupling space optical signals
The optical antenna receives wireless optical signals from a free space, and transmits the optical signals to the optical wavefront detector and the optical coupler after necessary beam shaping, beam expanding, beam converging, light splitting and filtering processing.
Step 2, receiving and calculating optical wavefront distortion information
The optical wavefront detector receives the incident optical signal processed by the optical antenna and detects the wavefront distortion parameter of the optical signal. The optical wavefront detector transmits the detected wavefront distortion parameters of the optical signals to the optical wavefront resolver through the communication interface. The optical wavefront resolver resolves wavefront distortion phase distribution information of the optical signal. The optical wavefront solver transmits the wavefront distortion phase distribution information to the optical signal demodulator through the communication interface.
Step 3, receiving and mixing the signal light and the local oscillator light and converting the signal light and the local oscillator light into electric signals
The optical coupler receives the spatial optical signal transmitted by the optical antenna and couples the spatial optical signal into the optical fiber. The optical coupler transmits the optical signal to the optical mixer through an optical fiber. The local oscillator laser source transmits the optical signal to the optical mixer through the optical fiber. The optical mixer mixes the optical signal and the local oscillator light and outputs the optical signal and the local oscillator light to the optical detector through the optical fiber. The optical detector outputs the converted electrical signal to an optical signal demodulator.
Step 4, optical signal equalization demodulation
The optical signal demodulator receives the electrical signal from the optical detector and the wavefront distortion phase distribution information from the optical wavefront resolver. The optical signal demodulator performs necessary power amplification and analog-to-digital conversion on the electric signal and then converts the electric signal into a digital signal. The optical signal demodulator processes the digital signal according to the wavefront distortion phase distribution information, eliminates the phase noise influence generated by the wavefront distortion of the optical signal, and realizes the balanced demodulation of the optical signal.
Step 5, optical signal demodulation control
The optical signal demodulation controller receives working state information, working temperature information and power supply condition information from the optical signal demodulator, the optical wavefront resolver and the local oscillator laser source, generates a control instruction according to corresponding information and forwards the control instruction to the corresponding working module.
The step 1 works before the step 2, the step 3 and the step 4. The step 5 works in the whole process. The step 2 and the step 3 can work simultaneously. And the step 4 works after the step 2 and the step 3.
Claims (5)
1. A wireless coherent optical communication link signal equalization system is characterized by comprising an optical antenna, an optical wavefront detector, an optical coupler, an optical mixer, a local oscillator laser source, an optical detector, an optical wavefront resolver, an optical signal demodulator and an optical signal demodulation controller;
the optical antenna leads optical signals to fixed end faces of the optical wavefront detector and the optical coupler along a designed angle after the optical signals are subjected to beam shaping, beam expanding, beam converging, beam splitting and filtering processing on an optical path;
the optical wavefront detector transmits detected wavefront information to the optical wavefront resolver through the communication interface; the optical wavefront solver transmits the solved wavefront phase distribution parameters to the optical signal demodulator through a communication interface; the communication interface is an optical fiber or electrical communication interface;
the optical mixer is respectively connected with the optical coupler, the local oscillator laser source and the optical detector through optical fibers; the optical coupler transmits the coupled optical signal to the optical mixer through an optical fiber; the local oscillator laser source transmits local oscillator light to the optical mixer through an optical fiber; the optical mixer mixes the received optical signal with the local oscillator light and outputs the mixed optical signal to the optical detector through the optical fiber; the optical fiber is a single-mode optical fiber or a single-mode polarization maintaining optical fiber;
the optical signal demodulation controller is connected with the optical wavefront solver, the optical signal demodulator and the local oscillator laser source through communication interfaces; the optical signal demodulation controller transmits the control signal to the optical wavefront resolver, the optical signal demodulator or the local oscillator laser source through the communication interface; the optical signal demodulation controller receives feedback signals from the optical wavefront solver, the optical signal demodulator or the local oscillator laser source through the communication interface.
2. The system for signal equalization in a wireless coherent optical communication link according to claim 1,
the optical antenna has the functions of receiving optical signals from an external free space, expanding beam, converging beam, shaping beam, splitting beam and filtering the optical signals in the optical antenna; the optical antenna structure adopts a transmission type structure, a reflection type structure or a structure combining the transmission type structure and the reflection type structure;
the optical wavefront detector has the functions of distinguishing the optical wavefront distortion of the space light and outputting the wavefront distortion information of the space light;
the optical coupler has the function of optically coupling the space into the optical fiber;
the optical mixer has the function of mixing and outputting optical signals input through the optical fiber and local oscillator laser;
the local oscillator laser source is a monochromatic laser source with the same wavelength as or smaller wavelength difference with the incident space optical signal, and has the capacity of mixing with the incident optical signal;
the optical detector is used for detecting the intensity information of the optical signal, and the detection range of the optical detector covers the wavelength of incident light, the wavelength of a local oscillator light and the wavelength of a difference frequency signal light obtained by mixing the incident light and the local oscillator light; the working bandwidth of the optical detector exceeds the modulation bandwidth of the optical signal; the light detection can be a single detector or a balanced detector;
the optical wavefront resolver has an optical wavefront distortion phase distribution information resolving function;
the optical signal demodulator has the functions of power amplification, analog-to-digital conversion, filtering, equalization and demodulation processing of the mixed optical signal,
the optical signal demodulation controller has the functions of controlling the working state, the working temperature and the power supply of the optical signal demodulator, the optical wavefront solver, the local oscillator laser source.
3. The system for signal equalization in a wireless coherent optical communication link according to claim 2, wherein the specific process for implementing dynamic equalization in the optical communication link is as follows:
step 1, an optical antenna receives a wireless optical signal from a free space, and transmits the optical signal to an optical wavefront detector and an optical coupler respectively after beam shaping, beam expanding, beam converging, light splitting and filtering;
step 2, the optical wavefront detector receives the optical signal which is processed by the optical antenna and then enters, and detects the wavefront distortion parameter of the optical signal; the optical wavefront detector transmits the detected wavefront distortion parameter of the optical signal to the optical wavefront resolver through the communication interface; the optical wavefront resolver resolves to obtain wavefront distortion phase distribution information of the optical signal; the optical wavefront resolver transmits wavefront distortion phase distribution information to the optical signal demodulator through the communication interface;
step 3, the optical coupler receives the space optical signal transmitted by the optical antenna and couples the space optical signal into the optical fiber; the optical coupler transmits the optical signal to the optical mixer through the optical fiber; the local oscillator laser source transmits the optical signal to the optical mixer through the optical fiber; the optical mixer mixes the optical signal and the local oscillator light and outputs the mixed signal to the optical detector through the optical fiber; the optical detector outputs the converted electric signal to an optical signal demodulator;
step 4, the optical signal demodulator receives the electric signal from the optical detector and the wave front distortion phase distribution information from the optical wave front resolver; the optical signal demodulator performs power amplification and analog-to-digital conversion on the electric signal and then converts the electric signal into a digital signal; the optical signal demodulator processes the digital signal according to the wavefront distortion phase distribution information, eliminates the phase noise influence generated by the wavefront distortion of the optical signal, and realizes the balanced demodulation of the optical signal.
4. The system for equalizing signals in a wireless coherent optical communication link according to claim 3, wherein the step 2 is performed in parallel with the step 3.
5. The system for signal equalization of the wireless coherent optical communication link according to claim 3, wherein the optical signal demodulation controller receives working state information, working temperature information, and power supply condition information from the optical signal demodulator, the optical wavefront resolver, and the local oscillator laser source, generates a control command according to the corresponding information, and forwards the control command to the corresponding working module.
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