CN103297150B - A kind of quantum communication precise tracking system - Google Patents
A kind of quantum communication precise tracking system Download PDFInfo
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- CN103297150B CN103297150B CN201310148029.XA CN201310148029A CN103297150B CN 103297150 B CN103297150 B CN 103297150B CN 201310148029 A CN201310148029 A CN 201310148029A CN 103297150 B CN103297150 B CN 103297150B
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Abstract
The present invention is quantum communication precise tracking system, comprise Long Distances deflection mirror, contracting Shu Danyuan, little stroke deflection mirror, quantum communications receiver module, the first color separation film, the second color separation film, the first amasthenic lens, smart tracking detector, the second amasthenic lens, superfinishing tracking detector, after quantum light enters contracting Shu Danyuan by the transmission of Long Distances deflection mirror, beam diameter reduces, arrive little stroke deflection mirror, after the first color separation film high reflectance reflection, enter rear end quantum communications receiver module, complete the decoding of quantum pumped FIR laser; After beacon beam enters contracting Shu Danyuan by the transmission of Long Distances deflection mirror, beam diameter reduces, arrive little stroke deflection mirror, the second color separation film is arrived after the first color separation film high-transmission rate transmission, after the energy light splitting of the second color separation film, one tunnel arrives smart tracking detector after the first amasthenic lens focuses on, and another road arrives superfinishing tracking detector after the second amasthenic lens focuses on.
Description
Technical field
The invention belongs to Technique on Quantum Communication field, specifically refer to a kind of smart tracking system of the D.D speculum series connection be applied in quantum communication system.
Background technology
Quantum communications are that quantum information field is closest to practical direction, free space quantum communications then can set up high stability low loss channel by space platform, realize overlength distance quantum communications experiment, will likely realize quantum communication network covering the whole world by space platform transfer.Build quantum communication system, depend on high performance Acquisition tracking and pointing (Acquisition, Tracking, Pointing are called for short ATP) system.The task of ATP system is that the beacon beam realized satellite communication terminal is launched is caught and high precision tracking, and the high efficiency height completing quantum signal light on star protects the reception of the degree of bias, builds high stable, low-loss quantum channel.What quantum communications lasing light emitter was launched is single photon quantum signal, and in order to avoid excessive geonetrical attenuation reduces receiving efficiency, the angle of divergence of communication beam must be very narrow, and usually in tens microradian magnitudes, this just requires that ATP system has the tracking accuracy of microradian level.Satellite-ground quantum communication light path is through atmosphere in addition, and atmospheric turbulance causes the direction of quantum-information transmission light beam and beacon light beam to drift about, and causes link to rise and fall.In order to the shake that atmospheric turbulance can be suppressed to cause, ATP system also needs to have very high system bandwidth.
Current known high precision tracking telescope adopts compound heavy metal structure.Teacher Ma Jiaguang proposes large aperture telescope and the independent speculum that rotates to carry out being bonded bonded bearing strip, main track frame fills a height orientation all can the deflection mirror of fine motion, in order to control the direction of transmitting and receiving optical axis, large-scale high precision tracking can be realized.
A kind of satellite laser communication compound axis light tracking device of prior art and control method, with realize satellite laser communications terminal on a large scale, large bandwidth and high-precision aiming, catch and follow the tracks of.
This track sight is based on the composite shaft of thick pointing system uninstallation essence pointing system, adopt the thick pointing system that rotates biprism structure and high bandwidth essence pointing system combines, adopt three sections to window and the single cmos sensor of variable sampling rate be acquisition and tracking transducer, common 4 quadrant detector as communication tracking transducer, a deflection mirror forms smart tracking loop in conjunction with communication tracking transducer.Communication light sensor probes Communication ray, adopt semi-transparent semi-reflecting speculum, this decreases half with regard to making the energy of arrival communication laser signal receiver.The smart tracking of this light splitting can not be applied to quantum communications field, because require Communication ray arrival quantum detector as much as possible in quantum communications field, so do not allow to carry out light splitting to quantum light.Only utilize a set of smart pointing system to communication tracking transducer of arranging in pairs or groups in invention in addition, the visual field of communication tracking transducer is suitable with the range of movement of smart pointing system, if system accomplishes high bandwidth and high accuracy simultaneously, then range of movement is very little, can not realize catching the smooth transition with smart trace flow.
Quantum communication system is different from classical ATP system and laser communication system, because in quantum sciences experimental duties, all using the polarization state of single photon as information carrier, therefore in testing with guaranteeing star, transmitting terminal produces the photon of certain polarization state, and makes this photon be the key of experiment with the detection of identical polarization state receiving end.The polarization contrast change that polarised light transmits through satellite-ground link directly affects communication bit error rates, and therefore quantum requirement of experiment polarization contrast is more high better.In quantum communications process, theoretical and experiment all proves that air can be ignored the impact of polarization state, therefore mainly consider the effect of polarization of load and ground station's optical-mechanical system on star when system, target is the polarization contrast controlling payload and ground station's optical-mechanical system.The following solution route of main employing: monolithic eyeglass height is protected and partially designed processing: be coated with the inclined film system of high guarantor, control the phase delay of monolithic eyeglass as far as possible, improve the polarization fidelity of monolithic eyeglass.Reduce relay lens quantity: by optimizing light path design, reduce number of mirrors, the phase-delay quantity that control system is total as far as possible.Therefore, quantum communications field is in the urgent need to a kind of smart tracking system realizing high bandwidth and high precision tracking while ensureing the efficiency of light energy utilization, system polarization fidelity to greatest extent.
Summary of the invention
In order to solve the problem of prior art, the present invention will propose the quantum communication precise tracking system of a kind of D.D speculum series connection, with overcome existing smart tracking system efficiency of transmission low, catch and essence follow the tracks of can not the defect of smooth transition, this system can ensure that whole communication link is protected to greatest extent and persists in asking simultaneously.
Quantum communication precise tracking system provided by the invention, comprise Long Distances deflection mirror, contracting Shu Danyuan, little stroke deflection mirror, quantum communications receiver module, first color separation film, second color separation film, first amasthenic lens, essence tracking detector, second amasthenic lens, superfinishing tracking detector, wherein: on the reverberation bunch of Long Distances deflection mirror, place contracting bundle successively, little stroke deflection mirror, the reflection ray of little stroke deflection mirror places the first color separation film, the reflection ray of the first color separation film is placed quantum communications receiver module, the transmitted ray of the first color separation film places the second color separation film successively, first amasthenic lens, essence tracking detector, the reflected light path also comprising the second color separation film places the second amasthenic lens successively, superfinishing tracking detector, quantum light through light path: quantum light by Long Distances deflection mirror transmission enter contracting Shu Danyuan after beam diameter reduce, arrive little stroke deflection mirror, after the first color separation film high reflectance reflection, enter rear end quantum communications receiver module, complete the decoding of quantum pumped FIR laser, beacon beam through light path: beacon beam by Long Distances deflection mirror transmission enter contracting Shu Danyuan after beam diameter reduce, arrive little stroke deflection mirror, the second color separation film is arrived after the first color separation film high-transmission rate transmission, after the energy light splitting of this second color separation film, one tunnel arrives smart tracking detector after the first amasthenic lens focuses on, and another road arrives superfinishing tracking detector after the second amasthenic lens focuses on.
The present invention is compared with prior art advantageously: utilize the Dual compound axis track algorithm that D.D speculum merges, effectively can play the performance of high frame rate detector, improves suppressing bandwidth and tracking accuracy.Adopt double control speculum can solve the design contradiction of deflection mirror in addition, if will make large range of deflection and have the deflection mirror of high resonance frequency, high linearity, then expense can significantly rise.Two series connection deflection control speculum collocation essence follow the tracks of and superfinishing follow the tracks of two detectors, after color separation film is placed in two deflection mirrors, essence and superfinishing detector before, make like this to arrive relay lens minimum number needed for quantum communications receiver module, effectively ensure system transfers efficiency and polarization fidelity.
Accompanying drawing explanation
Fig. 1 is that D.D speculum of the present invention is connected smart tracking system structural representation;
Fig. 2 a and Fig. 2 b is that D.D speculum of the present invention is connected smart tracking system Closed loop track error curve;
In figure:
1 Long Distances deflection mirror, 2 contracting Shu Danyuan, 3 little stroke deflection mirrors,
4 quantum communications receiver modules, 5 first color separation films, 6 second light path color separation films,
7 first amasthenic lens, 8 smart tracking detectors, 9 second amasthenic lens,
10 superfinishing tracking detectors.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
The present invention is described in further detail below in conjunction with accompanying drawing 1 and embodiment.In this instance system, comprise Long Distances deflection mirror 1, contracting Shu Danyuan 2, little stroke deflection mirror 3, quantum communications receiver module 4, first color separation film 5, second color separation film 6, first amasthenic lens 7, smart tracking detector 8, second amasthenic lens 9, superfinishing tracking detector 10, wherein:
The reverberation bunch of Long Distances deflection mirror 1 places contracting Shu Danyuan 2, little stroke deflection mirror 3 successively, the reflection ray of little stroke deflection mirror 3 is placed the first color separation film 5, the reflection ray of the first color separation film 5 places quantum communications receiver module 4, the transmitted ray of the first color separation film 5 is placed the second color separation film 6, first amasthenic lens 7, smart tracking detector 8 successively, also comprise follow the tracks of light path second color separation film 6 reflected light path on place the second amasthenic lens 9, superfinishing tracking detector 10 successively; Quantum light through light path: quantum light by Long Distances deflection mirror 1 transmission enter contracting Shu Danyuan 2 after beam diameter reduce, arrive little stroke deflection mirror 3, after the first color separation film 5 high reflectance reflection, enter rear end quantum communications receiver module 4, complete the decoding of quantum pumped FIR laser.Beacon beam through light path: beacon beam by Long Distances deflection mirror 1 transmission enter contracting Shu Danyuan 2 after beam diameter reduce, arrive little stroke deflection mirror 3, the second color separation film 6 following the tracks of light path is arrived after the first color separation film 5 high-transmission rate transmission, after the energy light splitting of this second color separation film 6, a road arrives smart tracking detector 8 after the first amasthenic lens 7 focuses on.Another road arrives superfinishing tracking detector 10 after the second amasthenic lens 9 focuses on.
Described Long Distances deflection mirror 1 is the deflection mirror of large deflection angle degree; Described contracting Shu Danyuan 2 is transmission-type or autocollimator system; Described primary deflector angle deflection mirror 3 is the deflection mirror of Piezoelectric Ceramic; The first described color separation film 5 is reflection quantum Communication ray, transmission beacon beam; Described the second color separation film 6 pairs of beacon beams carry out 50: 50 energy light splitting; Described smart tracking detector 8 and superfinishing tracking detector 10 are CCD camera or CMOS camera, and the frame frequency of superfinishing tracking detector 10 is greater than the frame frequency of smart tracking detector 8; The focal length of the first described amasthenic lens is less than the focal length of the second amasthenic lens.
Before first color separation film 5 is placed in smart tracking detector 8 and superfinishing tracking detector 10, but this causes deflection mirror series arrangement in the optical path, this structure adopts any one detector to carry out closed-loop control and all can influence each other, and therefore needs in control procedure to consider that decoupling zero just can complete high bandwidth and high accuracy controls.The tracing control flow process of whole system: after beacon beam enters smart tracking detector 8 visual field, the miss distance of smart tracking detector 8 controls Long Distances deflection mirror 1 and carries out closed loop, and system forms the two detection type compound heavy metal structure of the first order.After beacon beam enters superfinishing tracking detector 10 visual field, the miss distance utilizing superfinishing tracking detector 10 to export is controlled little stroke deflection mirror 3 and carry out closed loop, Long Distances deflection mirror 1 no longer adopts the miss distance of smart tracking detector 8 to carry out closed loop simultaneously, but use the positional information of little stroke deflection mirror 3 after decoupling zero instead and the miss distance information of superfinishing tracking detector 10 carries out closed-loop control, form second level single detector compound axis control structure.The error transfer function of system is main shaft, thick sub-axle, sperm axis error transfer function are amasss, this illustrate two bonded bearing strip without margin exponent number be main shaft, thick sub-axle, sperm sub system without margin exponent number sum, the smart tracking system that therefore D.D speculum is connected can realize very high control precision.
In the present embodiment, the deflection angle of Long Distances deflection mirror 1 is 20 points, for the OIM100 product on market, contracting Shu Danyuan 2 (the product B M5 beam-shrinked mirror head on market) contracting beam ratio is 5: 1, the deflection angle of little stroke deflection mirror 3 is 3 points, is the product S-330 piezo-electrical mirror on market, the first color separation film 5 pairs quantum laser reflectivity 99%, be greater than 99% to beacon beam transmissivity, the second color separation film 6 pairs beacon beam carries out 50: 50 energy light splitting.First amasthenic lens 7 focal length is 114mm, and smart tracking detector 8 is the product UF1000-CCD camera on market, frame frequency 400Hz, pixel dimension 15um.Superfinishing tracking detector 8 amasthenic lens 9 focal length is 230mm, and superfinishing tracking detector 10 is the product mc1362-CMOS camera on market, and pixel count is 1280 × 1024, and frame frequency is 500Hz, and when size of windowing is 128 × 128, frame frequency reaches 2000Hz.Horizontal 100km quantum entanglement distribution is tested to have utilized this embodiment system to carry out, and utilizes superfinishing tracking detector 10 to record the change of facula mass center, carry out the tracking accuracy of evaluation system with this in experiment.Open loop error hot spot shake (RMSx, RMSy) before system closed loop is respectively 15.7 μ rad and 14.1 μ rad.After the Dual compound axis closed loop mode that system proceeds to essence, superfinishing tracking is merged, as shown in Figure 2 a and 2 b, hot spot shake (RMSx, RMSy) is respectively 3.2 μ rad and 4 μ rad for error curve and facula mass center distribution map.
The above; be only the embodiment in the present invention, but protection scope of the present invention is not limited thereto, any people being familiar with this technology is in the technical scope disclosed by the present invention; the conversion or replacement expected can be understood, all should be encompassed in of the present invention comprising within scope.
Claims (7)
1. a quantum communication precise tracking system, it is characterized in that: comprise Long Distances deflection mirror, contracting Shu Danyuan, little stroke deflection mirror, quantum communications receiver module, first color separation film, second color separation film, first amasthenic lens, essence tracking detector, second amasthenic lens, superfinishing tracking detector, wherein: on the reflection ray of Long Distances deflection mirror, place contracting Shu Danyuan successively, little stroke deflection mirror, the reflection ray of little stroke deflection mirror places the first color separation film, the reflection ray of the first color separation film is placed quantum communications receiver module, the transmitted ray of the first color separation film places the second color separation film successively, first amasthenic lens, essence tracking detector, the reflected light path also comprising the second color separation film places the second amasthenic lens successively, superfinishing tracking detector, quantum light is through following light path: after described quantum light enters contracting Shu Danyuan by the transmission of Long Distances deflection mirror, beam diameter reduces, arrive little stroke deflection mirror, after the first color separation film reflects quantum laser reflectivity 99%, enter rear end quantum communications receiver module, complete the decoding of quantum pumped FIR laser, beacon beam is through following light path: after described beacon beam enters contracting Shu Danyuan by the transmission of Long Distances deflection mirror, beam diameter reduces, arrive little stroke deflection mirror, the second color separation film is arrived after the first color separation film is greater than 99% transmission to beacon beam transmissivity, after the energy light splitting of this second color separation film, one tunnel arrives smart tracking detector after the first amasthenic lens focuses on, and another road arrives superfinishing tracking detector after the second amasthenic lens focuses on.
2. quantum communication precise tracking system according to claim 1, it is characterized in that, described Long Distances deflection mirror is the deflection mirror of large deflection angle degree.
3. quantum communication precise tracking system according to claim 1, it is characterized in that, described contracting Shu Danyuan is transmission-type or autocollimator system.
4. quantum communication precise tracking system according to claim 1, it is characterized in that, described little stroke deflection mirror is the deflection mirror of Piezoelectric Ceramic.
5. quantum communication precise tracking system according to claim 1, it is characterized in that, the second described color separation film carries out 50: 50 energy light splitting to beacon beam.
6. quantum communication precise tracking system according to claim 1, it is characterized in that, described smart tracking detector and superfinishing tracking detector are CCD camera or CMOS camera, and the frame frequency of superfinishing tracking detector is greater than the frame frequency of smart tracking detector.
7. quantum communication precise tracking system according to claim 1, it is characterized in that, the focal length of the first described amasthenic lens is less than the focal length of the second amasthenic lens.
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| CN103840890A (en) * | 2014-03-17 | 2014-06-04 | 中国科学院光电技术研究所 | Optical system of quantum communication ground station telescope |
| CN104393932B (en) * | 2014-11-20 | 2017-02-01 | 中国科学院光电技术研究所 | Real-time correction method for optical axis of telescope of quantum communication ground station |
| CN104407321B (en) * | 2014-11-25 | 2017-04-26 | 西安电子科技大学 | Quantum ranging-based estimation method and equipment for relative orbits of formation flying satellites |
| CN106650193B (en) * | 2015-11-02 | 2020-06-30 | 深圳市祈飞科技有限公司 | Method for optimizing quantum information transmission channel |
| CN107124228B (en) * | 2017-06-13 | 2019-08-13 | 中国科学院光电技术研究所 | A method of the light beam of laser space communication signal light transmit-receive cofrequency rate is subjected to high-purity separation |
| CN107749554B (en) * | 2017-11-24 | 2019-10-22 | 武汉华星光电半导体显示技术有限公司 | Excimer laser processing unit and its laser collection device |
| CN110098874B (en) * | 2019-05-17 | 2023-12-26 | 中国科学院上海技术物理研究所 | Polarization-maintaining large-range pointing quantum communication optical device and method based on U-shaped optical path |
| CN110579872B (en) * | 2019-09-27 | 2021-12-07 | 网络通信与安全紫金山实验室 | Tracking and aiming system and adjusting method |
| CN111367073B (en) * | 2020-04-29 | 2022-03-29 | 中国科学院光电技术研究所 | Single-detection composite shaft control system design method based on position correction mode |
| CN113568133B (en) * | 2021-07-20 | 2023-04-07 | 西安工业大学 | Advanced aiming and precise tracking two-in-one system and light beam pointing method |
| CN114050862B (en) * | 2022-01-13 | 2022-04-26 | 季华实验室 | Resonance frequency control method, device, system and medium of quantum communication tracker |
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