CN110932786A - Uplink light field conjugate precompensation laser communication system based on sodium beacon - Google Patents

Uplink light field conjugate precompensation laser communication system based on sodium beacon Download PDF

Info

Publication number
CN110932786A
CN110932786A CN201911170352.0A CN201911170352A CN110932786A CN 110932786 A CN110932786 A CN 110932786A CN 201911170352 A CN201911170352 A CN 201911170352A CN 110932786 A CN110932786 A CN 110932786A
Authority
CN
China
Prior art keywords
laser
communication
sodium beacon
sodium
precompensation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201911170352.0A
Other languages
Chinese (zh)
Other versions
CN110932786B (en
Inventor
黄建
尧联群
王功长
李平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
32037 Troops Of Chinese Pla
Chongqing Technology and Business University
Original Assignee
Chongqing Technology and Business University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chongqing Technology and Business University filed Critical Chongqing Technology and Business University
Priority to CN201911170352.0A priority Critical patent/CN110932786B/en
Publication of CN110932786A publication Critical patent/CN110932786A/en
Application granted granted Critical
Publication of CN110932786B publication Critical patent/CN110932786B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
    • G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

The invention discloses a sodium beacon uplink light field conjugate precompensation laser communication system which comprises a communication laser, a beam expanding lens, a third beam splitter, a communication transmitting telescope, a receiving end, a sodium beacon transmitting system and a light field conjugate precompensation system, wherein the light field conjugate precompensation system comprises a polarizer, a liquid crystal display layer, an analyzer, a second beam splitter, an amplitude controller, an area array CCD (charge coupled device), a first beam splitter, a wavefront detector, a wavefront controller and a phase corrector. By adopting the scheme, the deformable mirror liquid crystal spatial light modulator is taken as a technical route, and aiming at the conditions of poor station addresses under the atmospheric condition and high communication quality requirement, the sodium beacon is utilized to detect the atmospheric turbulence, and amplitude and phase precompensation is carried out on communication laser, so that a communication light spot received by a receiving end is close to a diffraction limit, the system error rate is effectively reduced, the communication quality is improved, the cost is low, and the reliability is high.

Description

Uplink light field conjugate precompensation laser communication system based on sodium beacon
Technical Field
The invention relates to the field of communication equipment, in particular to a laser communication system based on sodium beacon uplink light field conjugate precompensation.
Background
With the advent of the 5G communication age, the requirement of modern technologies for high transmission rate and high communication bandwidth cannot be met by using radio waves for communication. Compared with radio wave communication, the transmission speed is increased from the Kbps level to the Gbps level by utilizing laser for communication, and the communication bandwidth reaches 10 Gbps. Meanwhile, the laser communication volume is smaller, the mass is lighter, and the anti-electromagnetic interference capability is stronger, so that the laser communication becomes a main mode of next-generation deep space communication.
Due to the existence of atmospheric turbulence above the earth, a serious problem facing the earth-air communication is the reduction of communication quality caused by the atmospheric turbulence, which is mainly expressed in two aspects: on one hand, turbulence distorts the wave front phase of communication laser, thereby causing the effects of fuzzy expansion of light spots, light beam drift and the like; on the other hand, due to the diffraction action of phase fluctuation and uneven diffractors, the wave front amplitude of the communication laser is distorted, so that a flicker effect is caused, and meanwhile, the flicker effect influences the communication quality to the maximum extent. The above effects will cause the signal-to-noise ratio of the communication system to decrease and the bit error rate to increase.
Especially for laser communication uplink, the effect of flicker will be more serious due to the turbulence close to the communication laser transmitting end. The powerful means for overcoming the problems is adaptive optics, and the adaptive optics system is usually placed at a communication receiving terminal and has a good phase fluctuation compensation effect. However, for the atmospheric environment with strong turbulence and when the requirement on communication quality is high, both amplitude and phase fluctuation need to be compensated, and the adaptive optical system is placed at the receiving terminal, and only phase fluctuation can be compensated, but amplitude fluctuation compensation cannot be performed. Therefore, the self-adaptive optics is arranged at the transmitting end to pre-compensate the phase and amplitude of the emergent communication laser, so that the light spots with the Gaussian distribution close to the diffraction limit are obtained at the receiving end, and the method becomes a powerful means for improving the communication quality.
In the aspect of a traditional adaptive optics system for laser communication, communication laser is utilized to detect wave front distortion, so that the energy of the laser used for a communication part is reduced, the signal-to-noise ratio of a receiving end light spot is reduced, the error rate is increased, and the powerful means for improving the problem is to utilize a sodium beacon to detect the wave front. On the other hand, adaptive optics is usually placed at a receiving end to perform phase correction; or, the adaptive optical system for uplink correction usually only performs phase correction and ignores the influence of the flicker effect, thereby resulting in a decrease in the signal-to-noise ratio and an increase in the bit error rate of the system.
Disclosure of Invention
In view of this, the invention provides a laser communication system based on sodium beacon uplink light field conjugate precompensation, which performs corresponding amplitude and phase precompensation on emergent communication laser, so that a communication receiving end obtains a high-quality stable airy disk close to a diffraction limit, the signal-to-noise ratio is improved, and the error rate is reduced.
The technical scheme is as follows:
the utility model provides a based on light field conjugate precompensation laser communication system of sodium beacon uplink, its key lies in: including communication laser instrument, beam expanding lens, third beam splitter, communication transmission telescope, receiving terminal and sodium beacon transmitting system, its key lies in: the optical field conjugate pre-compensation system comprises a polarizer, a liquid crystal display layer, an analyzer, a second spectroscope, an amplitude controller, an area array CCD, a first spectroscope, a wavefront detector, a wavefront controller and a phase corrector;
the transmitting telescope can receive sodium beacon backward resonance scattering return light, the sodium beacon return light is transmitted through the third spectroscope in sequence, after being reflected by the phase corrector and the second spectroscope, a part of sodium beacon return light is transmitted through the first spectroscope and enters the wavefront detector to detect phase distortion generated by turbulence, the wavefront controller controls the phase corrector to generate corresponding deformation according to information detected by the wavefront detector, the other part of sodium beacon return light is reflected by the first spectroscope and enters the area array CCD to perform amplitude fluctuation detection, and the amplitude controller controls the liquid crystal display layer to change amplitude transmissivity according to the information detected by the area array CCD;
after being expanded by the beam expanding lens, the communication laser emitted by the communication laser sequentially passes through the polarizer, the liquid crystal display layer and the analyzer to generate required amplitude distribution, reaches the phase corrector after penetrating through the second spectroscope, and reaches the receiving end after penetrating through the third spectroscope and the communication transmitting telescope after generating corresponding wavefront distortion through the phase corrector.
By adopting the scheme, the amplitude and phase distortion is detected through the sodium beacon, and the amplitude and phase fluctuation generated by the communication laser due to the influence of the atmosphere is simultaneously pre-compensated by utilizing the light field conjugate compensation mode to generate corresponding distortion, so that the distortion generated by the distortion and the influence of the atmospheric turbulence can be mutually offset after the communication laser passes through the atmospheric turbulence.
Preferably, the method comprises the following steps: still include slope speculum, slope controller and slope detector, the emission telescope can receive the stellar light, the stellar light gets into the slope detector after the third beam splitter reflection, the slope controller adjusts the slope speculum according to the detected signal of slope detector, communication laser expands the beam through beam expanding lens in proper order, reentrant after the slope speculum reflects the polarizer. By adopting the scheme, the vibration generated by atmospheric turbulence is eliminated, the effect of stabilizing the optical axis is achieved, and the light spots are prevented from falling outside the receiving target surface.
Preferably, the method comprises the following steps: the sodium beacon transmitting system generates a sodium beacon through a sodium beacon transmitting telescope or generates the sodium beacon through a communication transmitting telescope common aperture. By adopting the scheme, the sodium beacon can be generated independently or by utilizing the common aperture of the communication transmitting telescope according to the requirement, so that the requirements of more occasions can be met, and the application range of the system can be widened.
Preferably, the method comprises the following steps: when the sodium beacon transmitting system generates a sodium beacon through the sodium beacon transmitting telescope, the sodium beacon transmitting system further comprises a sodium yellow laser and a relay reflector, laser emitted by the sodium yellow laser is reflected by the relay reflector and is focused to generate the sodium beacon through beam expansion of the sodium beacon transmitting telescope, wherein the sodium yellow laser is a continuous laser, a quasi-continuous laser or a pulse laser. By adopting the scheme, the sodium yellow laser which is adaptive to the communication laser can be selected according to the condition of the communication laser, so that sodium beacon light spots meeting specific corresponding requirements are generated, and the compensation reliability is improved.
Preferably, the method comprises the following steps: the second spectroscope is spectral spectroscope, and the first spectroscope is proportional spectroscope. By adopting the scheme, the second spectroscope adopts spectrum light splitting, and can aim at different return light wave bands of communication laser and a sodium beacon, so that a transmission function is implemented on the communication laser, and the first spectroscope adopts proportion light splitting, so that light splitting with different energy ratios can be realized according to the requirements of a wavefront detector.
Preferably, the method comprises the following steps: the phase corrector is a piezoelectric ceramic reflection type deformable mirror plated with a high reflection film, or a piezoelectric wafer deformable mirror, or a film deformable mirror, or a surface micro-mechanical deformable mirror, or a liquid crystal device. The deformable mirrors in various forms can meet the functional requirements of the phase corrector in the system, and the system cost is further reduced.
Preferably, the method comprises the following steps: the wave-front detector is a shack-Hartmann wave-front detector, or a rectangular pyramid sensor, or a curvature sensor.
Compared with the prior art, the invention has the beneficial effects that:
by adopting the technical scheme, the optical field conjugate precompensation laser communication system based on the sodium beacon uplink optical field compensates the communication laser by the amplitude and phase fluctuation generated by the atmospheric turbulence in a light field conjugate compensation mode, compared with a system only performing phase compensation, the light spot obtained at the receiving end is closer to the diffraction limit, the ideal Airy spot is obtained, and the error rate of the communication system is lower;
the invention utilizes the sodium beacon to carry out the upstream path turbulent flow detection, does not need to consume the communication laser energy, so the communication quality is more reliable, because the invention carries out the precompensation to the turbulent flow at the emergent end, the invention is suitable for a system that the receiving end is not suitable for placing the self-adaptive optical compensation, and the amplitude distribution is controlled by adopting the mode of liquid crystal light modulation, compared with a binary diffraction optical element, the invention has simpler manufacture, lower cost, and more practicability and reliability.
In summary, the invention uses the sodium beacon to detect the atmospheric turbulence under the conditions of poor atmospheric conditions and high communication quality requirements, so as to pre-compensate the emergent communication laser, make the communication light spot received by the receiving end approach the diffraction limit, reduce the system error rate and improve the communication quality.
Drawings
FIG. 1 is a schematic diagram of the components and principles of the apparatus of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
The application mainly provides a light field conjugate precompensation laser communication system based on a sodium beacon uplink, which mainly comprises a communication laser 1, a beam expanding lens 2, an inclined reflector 3, an inclined controller 15, an inclined detector 16, a third beam splitter 17, a communication transmitting telescope 18, a receiving end 19, a sodium beacon transmitting system 23 and a light field conjugate precompensation system 14.
The light field conjugate precompensation system 14 comprises a liquid crystal spatial light modulator, a second beam splitter 7, an amplitude controller 8, an area array CCD9, a first beam splitter 10, a wavefront detector 11, a wavefront controller 12 and a phase corrector 13, wherein the liquid crystal spatial light modulator in the embodiment is composed of a polarizer 4, a liquid crystal display layer 5 and an analyzer 6, as shown in the figure, the phase corrector 13 is located on a transmission light path of the third beam splitter 17, the second beam splitter 7 is located on a reflection light path of the phase corrector 13, the first beam splitter 10 is located on a reflection light path of the second beam splitter 7, the wavefront detector 11 is located on a transmission light path of the first beam splitter 10, and the area array CCD9 is located on a reflection light path of the first beam splitter 10.
The wavefront controller 12 can receive the detection signal of the wavefront detector 11, and perform deformation adjustment on the phase corrector 13 according to the signal to complete phase compensation of the communication laser, and the amplitude controller 8 can complete amplitude fluctuation detection according to the area array CCD9, and then control the liquid crystal display layer in the liquid crystal spatial light modulator to change the amplitude transmittance according to the detection information to generate the required amplitude distribution, so that the communication laser can complete corresponding amplitude compensation after passing through the liquid crystal spatial light modulator.
The sodium beacon transmitting system 23 is used for generating a sodium beacon, the communication transmitting telescope 18 receives the sodium beacon and then resonantly scatters return light, the sodium beacon return light is transmitted through the third beam splitter 17, after the phase corrector 13 and the second beam splitter 7 are reflected, a part of the sodium beacon return light is transmitted through the first beam splitter 10 and enters the wavefront detector 11 to detect phase distortion generated by turbulence, the wavefront controller 12 reconstructs wavefront according to information obtained by detection, generates a control signal and drives the phase corrector 13 to generate corresponding deformation, and therefore phase closed-loop correction is completed; the other part of the sodium beacon return light is reflected by the first spectroscope 10 and enters the area array CCD9 to complete amplitude fluctuation detection, the amplitude controller 8 controls the change of the amplitude transmissivity of the liquid crystal display layer 5 according to the information obtained by detection to generate required amplitude distribution, the communication laser emitted by the communication laser 1 is expanded by the beam expanding lens 2, then is reflected by the inclined reflector 3 to stabilize the optical axis, then passes through the polarizer 4, the liquid crystal display layer 5 and the analyzer 6 to generate required amplitude distribution, then passes through the second spectroscope 7 to reach the phase corrector 13, passes through the third spectroscope 17 and the communication transmitting telescope 18 after corresponding wavefront distortion is generated by the phase corrector 13, and reaches the receiving end 19.
Because the communication transmitting telescope 18 can receive the return light of the sodium beacon and the star light, the star light can enter the inclined detector 16 after being reflected by the third beam splitter 17 to detect the inclination information, the inclination controller 15 can control the inclined reflector 3 according to the detection signal to eliminate the jitter generated by the atmospheric turbulence, and the communication laser in the embodiment can stabilize the optical axis after passing through the inclined reflector 3 and then entering the polarizer 4, thereby effectively preventing the light spot from deviating from the receiving target.
In this application, the sodium beacon transmitting system 23 may adopt an independent sodium beacon transmitting telescope 22, or may directly utilize the communication transmitting telescope 18 to generate a sodium beacon in a common aperture, which may relatively reduce the system cost, and in this embodiment, for easy understanding, the single sodium beacon transmitting telescope 22 is adopted, as shown in the figure, the sodium beacon transmitting system 23 further includes a yellow light laser 20 and a relay reflector 21, wherein the yellow light laser 20 may be a continuous laser, or a quasi-continuous laser or a pulse laser, etc., and after the laser emitted by the yellow light laser 20 is reflected by the relay reflector 21, the laser is expanded and focused by the sodium beacon transmitting telescope 22 to form a sodium beacon at high altitude.
In this embodiment, the second spectroscope 7 in the system uses spectral light splitting to ensure that the communication laser can be transmitted to the phase corrector 13 through the second spectroscope 7, and the sodium beacon return light cannot pass through the second spectroscope 7 and can only be reflected to the wavefront detector 10, while the first spectroscope 1 uses a proportional light splitting mode to split the sodium beacon return light reflected by the second spectroscope 7 in proportion, that is, according to the requirement of the wavefront detector 11, the sodium beacon return light is distributed in a certain proportion, so that the sodium beacon return light with different proportions is transmitted to the wavefront detector 11 or reflected to the area array CCD 9.
In this application, the phase corrector 13 is a piezoceramic reflective deformable mirror plated with a high reflection film, or a piezoceramic deformable mirror, or a thin-film deformable mirror, or a surface micromechanical deformable mirror, or a liquid crystal device, etc., the wavefront detector 11 is a shack-hartmann wavefront detector, or a rectangular pyramid sensor, or a curvature sensor, in this embodiment, the piezoceramic reflective deformable mirror plated with a high reflection film is preferably used as the phase corrector 13, and the shack-hartmann wavefront detector is preferably used as the wavefront detector 11.
The working principle of the sodium beacon uplink-based optical field conjugate precompensation laser communication system shown in fig. 1 is as follows:
sodium beacon transmission system 23 transmission wavelength accurate alignment D2aThe sodium laser of spectral line excites sodium atoms in the space of about 90km above the earth to generate resonanceScatter, producing a sodium beacon. Since the sodium beacon is approximately 90km from the surface, its wavefront can be viewed as a planar wavefront. The plane wavefront is called as a distorted wavefront through the disturbance of the atmospheric turbulence, and after being received by the communication transmitting telescope 18, the optical field thereof before reaching the phase corrector 13 can be recorded as:
Figure BDA0002288544550000071
Ab(xf,yf) For the amplitude distribution, theta, of the sodium beacon spot before it reaches the phase corrector 13b(xf,yf) Is the phase distribution of the spot.
After the laser is subjected to phase compensation by the phase corrector 13, the distorted sodium beacon return light is reflected by the second spectroscope 7, is transmitted by the first spectroscope 10 and enters the wavefront detector 11 to detect the phase distribution thetab(xf,yf) And then the wavefront controller 12 performs wavefront reconstruction and then controls the phase corrector 13 to perform phase compensation, thereby realizing closed-loop phase correction.
The other part of the sodium beacon return light after phase compensation is reflected by the second spectroscope 7 and the first spectroscope 10 in sequence and enters the area array CCD9 to detect the amplitude distribution Ab(xf,yf) And the amplitude controller 8 controls the voltage on the liquid crystal pixels of the liquid crystal display 5 according to the detected information, changes the amplitude transmission change rate, and enters an amplitude modulation mode.
After the communication laser emitted from the communication laser 1 is expanded by the beam expanding lens 2, the atmospheric turbulence inclination information is eliminated by the inclined reflector 3 to stabilize the optical axis, and at this time, the optical field is recorded as:
Figure BDA0002288544550000081
wherein A (x, y) is the amplitude distribution of the emergent communication laser field, thetaa(x, y) is the phase distribution of the incident light field, and (x, y) is the coordinates of the light field incident on the liquid crystal display layer 5.
The liquid crystal spatial light modulator mainly realizes the wave surface amplitude and phase modulation of incident light beams through the optical polarization and the birefringence of liquid crystal molecules, namely the optical modulation characteristics of the liquid crystal spatial light modulator are mainly the optical polarization and the birefringence. By setting different relative polarization orientations of the polaroids and changing the voltage applied to the liquid crystal pixels, the modulation mode and the modulation characteristic curve of the corresponding liquid crystal spatial light modulator can be obtained.
Let the angles of the front surface orientations of the polarizer 4, the liquid crystal display layer 5, and the analyzer 6 with respect to the vertical direction be ψ1、ψ2And psiDα denotes the twist angle of the liquid crystal molecule, d denotes the thickness of the liquid crystal molecule layer, and neAnd noRefractive indices of e light and o light, respectively, by setting different psi1、ψ2By changing the voltage V (x, y) applied to the liquid crystal pixel (x, y) and correspondingly changing the amplitude transmittance of each pixel, the amplitude modulation of the entire wave surface can be realized, and the transmittance is:
Figure BDA0002288544550000082
wherein:
Figure BDA0002288544550000083
Figure BDA0002288544550000084
and an amplitude distribution B (x) arriving at the phase corrector 13f,yf) As a function of T (x, y), the optical field of the outgoing communication laser arriving at the phase corrector 13 can be expressed as:
Figure BDA0002288544550000085
wherein: b (x)f,yf) For the amplitude distribution after amplitude compensation, (x)f,yf) Is a coordinate on the phase corrector 13, theta (x)f,yf) For the phase of the wavefront incident on the phase corrector 13, when the communication laser beam passes throughThe beam splitter 7 reaches a phase corrector 13, and the communication laser light is reflected by the phase corrector 13 to generate a phase psi (x) conjugated with the phase distortion of the upstream turbulent flowf,yf) The optical field distribution when the communication laser leaves the phase corrector 13 is:
Figure BDA0002288544550000091
according to the reversible principle of the light path, the emergent light field of the communication laser after being modulated by the liquid crystal display layer 5 and the phase corrector 13 only needs to satisfy the following conditions:
B(xf,yf)∝Ab(xf,yf)
θ(xf,yf)+ψ(xf,yf)＝-θb(xf,yf)
wherein. varies.. represents B (x)f,yf) Is proportional to Ab(xf,yf) When the conditions are met, the receiving end 19 of the communication system can obtain near diffraction limit light spots, the laser communication quality is greatly improved, and the error rate is reduced.
Finally, it should be noted that the above-mentioned description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.

Claims (7)

1. A laser communication system based on sodium beacon uplink light field conjugate precompensation is characterized in that: including communication laser instrument (1), beam expanding lens (2), third spectroscope (17), communication transmission telescope (18), receiving terminal (19) and sodium beacon transmitting system (23), its characterized in that: the device is characterized by further comprising a light field conjugation precompensation system (14), wherein the light field conjugation precompensation system (14) comprises a polarizer (4), a liquid crystal display layer (5), an analyzer (6), a second beam splitter (7), an amplitude controller (8), an area array CCD (9), a first beam splitter (10), a wave front detector (11), a wave front controller (12) and a phase corrector (13);
the transmitting telescope (18) can receive sodium beacon backward resonance scattering return light, the sodium beacon return light is transmitted through the third beam splitter (17) in sequence, after being reflected by the phase corrector (13) and the second beam splitter (7), a part of the sodium beacon return light is transmitted through the first beam splitter (10) and enters the wavefront detector (11) to detect phase distortion generated by turbulence, the wavefront controller (12) controls the phase corrector (13) to generate corresponding deformation according to information detected by the wavefront detector (11), the other part of the sodium beacon return light is reflected by the first beam splitter (10) and enters the area array CCD (9) to detect amplitude fluctuation, and the amplitude controller (8) controls the liquid crystal display layer (5) to change amplitude transmissivity according to the information detected by the area array CCD (9);
communication laser that communication laser instrument (1) sent is after beam expanding lens (2) expand, produces required amplitude distribution through polarizer (4), liquid crystal display layer (5) and analyzer (6) in proper order to see through reacing phase corrector (13) behind second spectroscope (7), after phase corrector (13) produced corresponding wave front distortion, see through third spectroscope (17) and communication transmitting telescope (18), reach receiving terminal (19).
2. The sodium beacon uplink light field conjugate precompensation-based laser communication system of claim 1, wherein: still include slope speculum (3), slope controller (15) and slope detector (16), the planet light can be received in transmission telescope (18), the stellar light gets into slope detector (16) after third beam splitter (17) reflects, slope controller (15) adjust slope speculum (3) according to the detection signal of slope detector (16), communication laser passes through beam expanding lens (2) and expands the beam in proper order, reentrant after slope speculum (3) reflect polarizer (4).
3. The sodium beacon uplink light field conjugate precompensation-based laser communication system of claim 1, wherein: the sodium beacon transmission system (23) generates sodium beacons through the sodium beacon transmission telescope (22) or through the communication transmission telescope (18) common aperture.
4. The sodium beacon uplink light field conjugate precompensation-based laser communication system of claim 3, wherein: when the sodium beacon transmitting system (23) generates a sodium beacon through the sodium beacon transmitting telescope (22), the sodium beacon transmitting system (23) further comprises a sodium yellow laser (20) and a relay reflector (21), laser emitted by the sodium yellow laser (20) is reflected through the relay reflector (21) and is expanded and focused through the sodium beacon transmitting telescope (22) to generate the sodium beacon, wherein the sodium yellow laser (20) is a continuous laser, a quasi-continuous laser or a pulse laser.
5. The sodium beacon uplink light field conjugate precompensation-based laser communication system of claim 1, wherein: the second spectroscope (7) is used for spectral light splitting, and the first spectroscope (10) is used for proportional light splitting.
6. The sodium beacon uplink light field conjugate precompensation-based laser communication system according to any one of claims 1 to 5, wherein: the phase corrector (13) is a piezoelectric ceramic reflection type deformable mirror plated with a high reflection film, or a piezoelectric wafer deformable mirror, or a film deformable mirror, or a surface micro-mechanical deformable mirror, or a liquid crystal device.
7. The sodium beacon uplink light field conjugate precompensation-based laser communication system of claim 1, wherein: the wave-front detector (11) is a shack-Hartmann wave-front detector, or a rectangular pyramid sensor, or a curvature sensor.
CN201911170352.0A 2019-11-26 2019-11-26 Uplink light field conjugate precompensation laser communication system based on sodium beacon Active CN110932786B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911170352.0A CN110932786B (en) 2019-11-26 2019-11-26 Uplink light field conjugate precompensation laser communication system based on sodium beacon

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911170352.0A CN110932786B (en) 2019-11-26 2019-11-26 Uplink light field conjugate precompensation laser communication system based on sodium beacon

Publications (2)

Publication Number Publication Date
CN110932786A true CN110932786A (en) 2020-03-27
CN110932786B CN110932786B (en) 2023-02-14

Family

ID=69851090

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911170352.0A Active CN110932786B (en) 2019-11-26 2019-11-26 Uplink light field conjugate precompensation laser communication system based on sodium beacon

Country Status (1)

Country Link
CN (1) CN110932786B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111443480A (en) * 2020-05-20 2020-07-24 重庆工商大学 Sodium guide star uplink laser light field pre-correction system
CN111487771A (en) * 2020-06-15 2020-08-04 重庆工商大学 Sodium beacon pre-correction system based on ultra-short pulse multilayer conjugate adaptive optics
WO2022206468A1 (en) * 2021-03-31 2022-10-06 华为技术有限公司 Spatial light transmission method and related device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070077071A1 (en) * 2005-09-30 2007-04-05 Mikhail Belenkiy System for measuring atmospheric turbulence
CN105629457A (en) * 2015-12-31 2016-06-01 中国科学院光电技术研究所 Co-aperture emission and correction telescope combining Rayleigh beacon and sodium beacon
CN108181710A (en) * 2018-02-01 2018-06-19 中国科学院光电技术研究所 A kind of sodium beacon emissions telescope of complex amplitude modulation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070077071A1 (en) * 2005-09-30 2007-04-05 Mikhail Belenkiy System for measuring atmospheric turbulence
CN105629457A (en) * 2015-12-31 2016-06-01 中国科学院光电技术研究所 Co-aperture emission and correction telescope combining Rayleigh beacon and sodium beacon
CN108181710A (en) * 2018-02-01 2018-06-19 中国科学院光电技术研究所 A kind of sodium beacon emissions telescope of complex amplitude modulation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111443480A (en) * 2020-05-20 2020-07-24 重庆工商大学 Sodium guide star uplink laser light field pre-correction system
CN111487771A (en) * 2020-06-15 2020-08-04 重庆工商大学 Sodium beacon pre-correction system based on ultra-short pulse multilayer conjugate adaptive optics
WO2022206468A1 (en) * 2021-03-31 2022-10-06 华为技术有限公司 Spatial light transmission method and related device

Also Published As

Publication number Publication date
CN110932786B (en) 2023-02-14

Similar Documents

Publication Publication Date Title
CN110932786B (en) Uplink light field conjugate precompensation laser communication system based on sodium beacon
US7616897B2 (en) Data port alignment of free space optical communications terminal with adaptive optics
US7406263B2 (en) Combined wavefront sensor and data detector for a free space optical communications system with adaptive optics
US8260146B2 (en) Free-space optical transceiver using multimode fiber to couple single mode input optical signal
CN108181710B (en) Sodium beacon transmitting telescope with complex amplitude modulation
US5684545A (en) Adaptive optics wave measurement and correction system
US4102572A (en) Dual-wavelength coherent optical adaptive systems
US8076624B1 (en) Non-cooperative laser target enhancement system and method
US9503182B2 (en) Apparatus and method for reducing signal fading due to atmospheric turbulence
CN105629457B (en) The common aperture transmitting that a kind of Rayleigh beacon is combined with sodium beacon and correction telescope
CN108574533B (en) Common-caliber laser communication optical transmitter and receiver based on optical phased array
US5042922A (en) Method for improvidng the spatial resolution in an integrated adaptive optics apparatus
CN110907950B (en) Method for carrying out turbulence synchronous detection by using long pulse laser
US6683291B2 (en) Optimal beam propagation system having adaptive optical systems
CN110824697B (en) Self-adaptive optical system combining artificial beacon and wavefront-free detection
US5048935A (en) Method for adaptive correction of the phase non-uniformity of a liquid crystal light valve
US7194159B1 (en) Asymmetric optical circulator
CN111443480A (en) Sodium guide star uplink laser light field pre-correction system
US9304313B1 (en) Simplified system and method for compensated laser beam propagation
CN114024204B (en) Device and method for compensating DPL laser thermal distortion by utilizing SLM to generate hologram
CN117692747A (en) Circular sodium beacon generation system and method based on circular-cubic phase modulation
CN115314115B (en) Vortex optical communication transmitting device based on self-adaptive optical pretreatment
CN111308827B (en) Phase conjugate lens wavefront corrector
CN111487771B (en) Sodium beacon pre-correction system based on ultra-short pulse multilayer conjugate adaptive optics
CN118011628A (en) Array laser atmospheric aberration compensation device based on same-aperture transceiving and active illumination

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
TA01 Transfer of patent application right
TA01 Transfer of patent application right

Effective date of registration: 20230109

Address after: No.19, Xuefu Avenue, Nan'an District, Chongqing, 400000

Applicant after: CHONGQING TECHNOLOGY AND BUSINESS University

Applicant after: 32037 troops of the Chinese PLA

Address before: 400067 No. 19, Xuefu Avenue, Nan'an District, Chongqing

Applicant before: CHONGQING TECHNOLOGY AND BUSINESS University

GR01 Patent grant
GR01 Patent grant