CN102624447A - Double-optical-path real-time control differential interference receiving device - Google Patents
Double-optical-path real-time control differential interference receiving device Download PDFInfo
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- CN102624447A CN102624447A CN2012100874425A CN201210087442A CN102624447A CN 102624447 A CN102624447 A CN 102624447A CN 2012100874425 A CN2012100874425 A CN 2012100874425A CN 201210087442 A CN201210087442 A CN 201210087442A CN 102624447 A CN102624447 A CN 102624447A
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Abstract
Provided is a double-optical-path real-time control differential interference receiving device. The device comprises a polarization beam splitting device, a polarization beam combining device, a one-second wave plate, a light reflective mirror, an optical detector and an optical-to-electrical transducer. Differential phase shift keying is utilized to achieve real-time phase feedback control and information decoding of a free space optical signal. A full-light free space structure of a non-optical fiber is adopted for a receiving part of an optical signal in a space laser communication. After two paths of signals are respectively perform time difference, the two paths of signals are independently connected with a 1X2 optical bridge to perform balanced reception, and optical signal time difference coherent reception and real-time phase feedback control of monitoring signal time difference are achieved. A monitoring signal controls precise adjustment of the optical distance, stability of the optical distance difference is ensured, and precise of a system is ensured.
Description
Technical field
The present invention relates to the light signal demodulation, particularly a kind of double light path is controlled the differential interferometry receiving system in real time.
Background technology
Free space laser communication when laser transmission is passed through atmospheric channel, receives the influence of factors such as atmospheric turbulance, and beam wave surface produces distortion, and quality seriously descends.Receive laser signal and need overcome atmospheric turbulance, the method that adopts at present mainly contains and reduces to receive bore, adaptive optics wavefront correction, differential phase keying (DPSK) (DPSK) modulation signal from methods such as differential receptions.
Formerly technology [1] is (referring to High-data-rate systems for space applications; Proc.SPIE; Vol.2381,38,1995) adopt the DPSK modulation in the ground laser communication of described star; Receiver adopts optical fiber to amplify and the optical-fiber type Mach-Zehnder interferometers is separated the balancing reception, the high 3dB of remolding sensitivity monitoring switch (OOK) modulation direct detection method.But the corrugated quality after the atmospheric turbulance disturbance descends, and optical coupling efficiency is lower, influences sensitivity, makes DPSK modulator approach disturbance rejection ability can not get sufficient utilization.
Formerly technology [2] is (referring to Adaptive optics and ESA ' s optical ground station, Proc.SPIE, Vol.7464; 746406; 2009) the DPSK modulation is adopted in described star ground laser communication, and its device is Mach-Zehnder interferometers or michelson interferometer structure, wherein uses two groups of 4f set of lenses; The control precision that should guarantee the difference that two walls are long in the work is far superior to quarter-wave, is about 0.2 micron.Use two groups of set of lenses in this device, make the corrugated introduce bigger aberration, technology realizes going up difficult, reduces the communication accuracy rate.And this structure lacks accurate adjustment device and phase-locked loop, can't guarantee system accuracy, can not adjust in real time.Do not have balance to receive simultaneously, can't remove DC component, sensitivity is lower.
Summary of the invention
The present invention be directed to free space laser communication, overcome the above-mentioned difficulty of technology formerly, a kind of double light path differential interference receiving system of monitoring in real time is provided.This device has been realized the balance reception, and monitor optical is carried out phase compensation through the accurate adjustment of light path of phase lock circuitry real-time control signal light, the stable and system accuracy of maintenance optical path difference.
Technical solution of the present invention is following:
A kind of double light path is controlled the differential interferometry receiving system in real time, and its formation comprises as follows:
The first polarization beam apparatus place, the polarization beam splitting face of this first polarization beam apparatus and the linearly polarized light direction of advance of input signal light and monitor optical are 45 °.This first polarization beam apparatus is divided into orthogonal reverberation of plane of polarization and transmitted light with described two bundle incoming line polarised lights respectively.The reverberation of flashlight is input to the second polarization beam splitting face and reflection takes place through the 1/2nd wave plate, the 4th polarization beam apparatus in order through first speculum, second speculum, second polarization beam apparatus, incides the 4th polarization beam splitting face; Through first polarization beam apparatus, accurate position phase controller, second polarization beam apparatus, be input to the second polarization beam splitting face and transmission take place on the transmission direction of flashlight, incide the 4th polarization beam splitting face through the 1/2nd wave plate, the 4th polarization beam apparatus.Difference two branch roads of flashlight are divided into orthogonal reverberation of polarization state and transmitted light during through the 4th polarization beam splitting face; It is received by the 3rd photodetector and the 4th photodetector respectively; The output of the 3rd photodetector and the 4th photodetector links to each other with the input of homophase balancing circuitry, and the output of homophase balancing circuitry links to each other with the input of data processing circuit and described mlultiplying circuit.The monitor optical of other one tunnel vertical incidence incides first polarization beam apparatus; Transmitted light is through first speculum, second speculum, second polarization beam apparatus; Be input to the second polarization beam splitting face and transmission take place, incide the 3rd polarization beam splitting face through the 1/1st wave plate, the 3rd polarization beam apparatus; Monitor optical incides first polarization beam apparatus; Reverberation is through first polarization beam apparatus, accurate position phase controller, second polarization beam apparatus; Be input to the second polarization beam splitting face and reflection take place, incide the 3rd polarization beam splitting face through the 1/1st wave plate, the 3rd polarization beam apparatus.Difference two branch roads of monitor optical are divided into orthogonal reverberation of polarization state and transmitted light during through the 3rd polarization beam splitting face, are received by first photodetector, second photodetector respectively.The output termination orthogonal balanced circuit of first photodetector and second photodetector. the output of this orthogonal balanced circuit links to each other with mlultiplying circuit.The input of described mlultiplying circuit behind phase lock circuitry, with the accurate position of described control mutually the control end of controller link to each other.
Described input two-way light beam is imported simultaneously, exports this two bundles input light respectively simultaneously at output.The horizontal output of glancing incidence light, vertically incident light vertical output.Wherein one road monitoring light beam can be controlled accurate position phase controller through balancing circuitry, controls the phase change of other one road signal beams differential interferometry branch road with this.
Described first speculum, second speculum are formed the optical path difference module and are based upon on the uniform platform, divide into guide rail, move along the direction precision perpendicular to said horizontal branches for this platform.Light path module and message transmission rate G coupling, L
1The L that distance is constant, different
2Corresponding different data transmission rates, satisfy relation:
L
1-L
2＝c/G
Wherein: L
1Be the distance of difference Zhi Luduan from the first polarization beam splitting face to the second polarization beam splitting face, L
2Be the horizontal range of accurate position phase control end branch road from the first polarization beam splitting face to the second polarization beam splitting face, c is the light velocity, and G is a message transmission rate.
Technique effect of the present invention is following:
The present invention adopts differential phase keying (DPSK) modulation double light path to control the differential interferometry receiving system in real time, and this device adopts non-optical fiber free-space structure, and flashlight phase place and self differential phase interference decoded information have overcome the influence that the absolute phase distortion receives signal.
Its two, creationary proposition two-way optical input device, the two-way optical transmission is independent of each other mutually.Respectively by flashlight and monitor optical while input receiver; The output of two-way is connected with the balance detection device; Wherein monitor optical is exported the signal of telecommunication through the signal of signal synthetic behind the differential interferometry and partial decoding of h through behind the mlultiplying circuit, as the input signal of phase lock circuitry, controls accurate position phase controller; Keep the optical path difference of difference two branch roads stable, improve flashlight from the phase interference contrast.The double light path input has realized that the flashlight balance receives, separates the accurate position control mutually of mediation pilot signal.
The 3rd, this contrive equipment is simple and compact for structure, is easy to realize.This device does not need local oscillator light, and does not require that flashlight is identical with the monitor optical wavelength, can in receiving course, stablize received power, improves receiving efficiency, is new developing direction in the light signal receiving demodulation in the following laser communication.
Description of drawings
Fig. 1 controls the structural representation of differential interferometry receiving system in real time for double light path of the present invention.
Embodiment
To further explain of the present invention, but should not limit protection scope of the present invention below in conjunction with embodiment and accompanying drawing with this.
Visible by figure, double light path of the present invention is controlled the differential interferometry receiving system in real time and is comprised:
The polarization beam splitting face 1a of first polarization beam apparatus 1 and the linearly polarized light direction of advance of input signal light and monitor optical are 45 °.First polarization beam apparatus 1 is divided into orthogonal reverberation of plane of polarization and transmitted light with described two bundle incoming line polarised lights (flashlight glancing incidence and monitor optical vertical incidence) respectively.
The reverberation of flashlight is in order through first speculum 4, second speculum 5, second polarization beam apparatus 3; Be input to the second polarization beam splitting face 3a and reflection take place, incide the 4th polarization beam splitting face 9a through the 1/2nd wave plate 8, the 4th polarization beam apparatus 9; On the transmission direction of flashlight through first polarization beam apparatus 1, accurate position phase controller 2, the second polarization beam apparatus 3a; Be input to the second polarization beam splitting face 3a and transmission take place, incide the 4th polarization beam splitting face 9a through the 1/2nd wave plate 8, the 4th polarization beam apparatus 9.A polarization state polarization direction of described the 1/2nd wave plate 8 optical axis directions and incoming signal light becomes 22.5 degree.(do not comprise monitor optical this moment) when flashlight incides the 4th polarization beam splitting face 9a through difference two branch roads and be divided into orthogonal reverberation of polarization state and transmitted light; After carrying out polarization interference respectively; Receive by the 3rd photodetector 12 and the 4th photodetector 13, respectively light signal is converted into the two-way monitoring signal of telecommunication, be transferred in the homophase balancing circuitry 14; A part of signal of telecommunication after treatment links to each other with data processing circuit, the data message that final output decoder obtains; Another part signal of telecommunication links to each other with the input of described mlultiplying circuit 17.
The monitor optical of other one tunnel incident incides first polarization beam apparatus 1; Transmitted light is through first speculum 4, second speculum 5, second polarization beam apparatus 3; Be input to the second polarization beam splitting face 3a and transmission take place, incide the 3rd polarization beam splitting face 7a through the 1/1st wave plate 6, the 3rd polarization beam apparatus 7; Monitor optical incides first polarization beam apparatus 1; Reverberation is through the first polarization beam apparatus 1a, accurate position phase controller 2, second polarization beam apparatus 3; Be input to the second polarization beam splitting face 3a and reflection take place, incide the 3rd polarization beam splitting face 7a through the 1/1st wave plate 6, the 3rd polarization beam apparatus 7.A polarization state polarization direction of described the 1/1st wave plate 6 optical axis directions and incident monitor optical becomes 22.5 degree.(do not comprise flashlight this moment) when monitor optical incides the 3rd polarization beam splitting face 7a through difference two branch roads and be divided into orthogonal reverberation of polarization state and transmitted light; Carry out polarization interference; Receive by first photodetector 10, second photodetector 11; Respectively monitor optical is converted into the two-way monitoring signal of telecommunication, is linked into orthogonal balanced circuit 15.The signal of telecommunication of these orthogonal balanced circuit 15 outputs is input to mlultiplying circuit 17.Described mlultiplying circuit 17 is handled orthogonal balanced circuit 15 the partial data information that obtains and is handled the data message that obtains with homophase balancing circuitry 14 and comprehensively feeds back in the phase lock circuitry 18.Phase lock circuitry 18 provides lockin signal, as the control signal of fine phase modulator 2.This precision phase modulator 2 can adopt electrooptic modulator, and lockin signal changes crystal refractive index through control crystal voltage so, changes the light path of light beam through crystal, fine setting branch road phase place; Also can adopt the parallel optical glass in two surfaces dull and stereotyped, lockin signal changes light beam through dull and stereotyped optical path difference through the dull and stereotyped minute angle of accurate rotation parallel glass so, fine setting branch road phase place.Compensate with this differential phase that reaches flashlight.
Here require described input two-way light beam to import simultaneously, export this two bundles input light respectively simultaneously at output.The horizontal output of glancing incidence light, vertically incident light vertical output.Wherein monitor optical is at the output balance detection, controls the phase change of accurate position phase controller 2 through phase lock circuitry 18, makes the position of differential interferometry two branch roads of flashlight satisfy the corresponding matched condition mutually.
Distance by the first polarization beam splitting face 1a, first speculum 4, second speculum, 5 to second polarization beam splitting face 3a is L
1, constituting the difference branch road that light path is adjusted, the distance from the first polarization beam splitting face 1a to the second polarization beam splitting face 3a is L
2, constitute accurate position and control branch road mutually.
The optical path difference module that described first speculum 4, second speculum 5 are formed is based upon on the platform, and this divides into platform rail, for this platform along moving perpendicular to the direction of said horizontal branches is accurate.Light path module and message transmission rate G coupling, L
1The L that distance is constant, different
2Corresponding different data transmission rates, satisfy relation:
L
1-L
2＝c/G，
Wherein c is the light velocity, and G is a message transmission rate.Equal time interval of 1 bit transfer data through time difference of the two-way light of the difference light circuit of this receiving system output, survey and be restituted signal by the balance reception signal that said homophase balancing circuitry 14 is handled through the 3rd photodetector 12 and the 4th photodetector 13.
Described accurate position phase controller 2 is a phase control device that perhaps is made up of through motor braking, rotatable two surperficial collimating optics glass plates the electrooptic modulation crystal, and its running accuracy is 1 microradian.
Electronics such as described accurate position phase controller 2, photodetector, homophase balancing circuitry 14, orthogonal balanced circuit 15, data processing circuit 16 and phase lock circuitry 18 partly are matured product or technology, can buy or entrust development.
A polarization state polarization direction of the optical axis direction of the 1/1st wave plate 6, the 1/2nd wave plate 8 and the flashlight of incident or local oscillator light becomes 22.5 degree.Orthogonal polarised light through 1/2nd wave plates after, polarization direction rotation 45 degree.Flashlight and the monitor optical of supposing reception are the linearly polarized light (if other polarization state need convert linearly polarized light into) that polarization state 45 degree tilt.Through polarization beam apparatus the time, the reverberation of two-beam is orthogonal polarized light, and transmitted light is horizontal polarization light.
Claims (5)
1. a double light path is controlled the differential interferometry receiving system in real time, is characterised in that its formation comprises:
The direction of advance of the linearly polarized light of the flashlight of the polarization beam splitting face (1a) of first polarization beam apparatus (1) and input and the linearly polarized light of monitor optical is 45 ° respectively; First polarization beam apparatus (1) is divided into orthogonal reverberation of plane of polarization and transmitted light with the linearly polarized light of the described input signal light of quadrature incident and the linearly polarized light of described monitor optical respectively; Constitute difference branch road and accurate control branch road; Described difference branch road is successively through first speculum (4), second speculum (5) incident second polarization beam apparatus (3); Described accurate control branch road is successively through first polarization beam apparatus (1), accurate position phase controller (2) incident second polarization beam apparatus (3); The polarization beam splitting face (3a) of this second polarization beam apparatus (3) is divided into horizontal optical path and vertical light path with the two-beam of difference branch road and accurate control branch road; Described vertical light path gets into the 3rd polarization beam apparatus (7) through the 1/1st wave plate (6); Be divided into transmitted light and reverberation at the 3rd polarization beam splitting face (7a); This transmitted light and reverberation are surveyed by first photodetector (10) and second photodetector (11) respectively and are received, the input of the output termination orthogonal balanced circuit (15) of first photodetector (10) and second photodetector (11), and the output of this orthogonal balanced circuit (15) links to each other with the first input end of mlultiplying circuit (17); Described horizontal optical path is successively through the 1/2nd wave plate (8) input the 4th polarization beam apparatus (9); Polarization beam splitting face (9a) at the 4th polarization beam apparatus (9) is divided into reverberation and transmitted light; This reverberation and transmitted light are surveyed by the 3rd photodetector (12) and the 4th photodetector (13) respectively and are received; The output of the 3rd photodetector (12) and the 4th photodetector (13) links to each other with the input of homophase balancing circuitry (14); The output of this homophase balancing circuitry (14) links to each other with the input of data processing circuit (16) and second input of described mlultiplying circuit (17), the output of described mlultiplying circuit (18) behind phase lock circuitry (18) with the accurate position of described control mutually the control end of controller (2) link to each other.
2. double light path according to claim 1 is controlled the differential interferometry receiving system in real time; It is characterized in that described horizontal signal light and vertical monitor optical are input in described first polarization beam apparatus (1) device simultaneously; Wherein monitor optical is at the output balance detection; Control the phase change of accurate position phase controller (2) through phase lock circuitry (18), the position after making flashlight through differential interferometry two branch roads is satisfied the corresponding matched condition mutually.
3. double light path according to claim 1 is controlled the differential interferometry receiving system in real time; It is characterized in that the time difference through the two-way light of the difference light circuit of this receiving system output equals the time interval of modulating data 1 bit, survey and be restituted signal by the balance reception signal that said homophase balancing circuitry (14) is handled through the 3rd photodetector (12) and the 4th photodetector (13).
4. double light path according to claim 1 and 2 is controlled the differential interferometry receiving system in real time; It is characterized in that described first speculum (4), second speculum (5) composition optical path difference module are based upon on the uniform platform; Divide into guide rail; Along moving perpendicular to the direction of said horizontal branches is accurate, light path module and message transmission rate G mate, L for this platform
1The L that distance is constant, different
2Corresponding different data transmission rates, satisfy relation:
L
1-L
2＝c/G，
Wherein c is the light velocity, and G is a message transmission rate, L
1The distance of difference Zhi Luduan from the polarization beam splitting face (1a) of first polarization beam apparatus (1) to the polarization beam splitting face (3a) of second polarization beam apparatus (3), L
2Be accurate position phase control end branch road, horizontal range from the polarization beam splitting face (1a) of first polarization beam apparatus (1) to the polarization beam splitting face (3a) of second polarization beam apparatus (3).
5. double light path according to claim 1 is controlled the differential interferometry receiving system in real time; It is characterized in that described accurate position phase controller (2) is a phase control device that perhaps is made up of through motor braking, the parallel optical glass flat boards in rotatable two surfaces the electrooptic modulation crystal, running accuracy is 1 microradian.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107645341A (en) * | 2017-10-23 | 2018-01-30 | 南京航空航天大学 | Microwave photon phase detecting method, device and microwave photon phase-lock technique, device |
| CN109239931A (en) * | 2018-11-06 | 2019-01-18 | 上海联能光子技术有限公司 | A kind of automated production apparatus and method based on Free Space Optics bridge |
| CN109916743A (en) * | 2019-03-21 | 2019-06-21 | 京东方科技集团股份有限公司 | Dynamic mechanical measuring device, measurement method and calculating equipment |
| CN113206387A (en) * | 2021-04-22 | 2021-08-03 | 电子科技大学 | Wide-bandwidth terahertz quasi-optical sum-difference comparator |
| CN113508327A (en) * | 2019-02-01 | 2021-10-15 | 统雷有限公司 | High dynamic range imaging |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0653852A1 (en) * | 1993-11-16 | 1995-05-17 | Canon Kabushiki Kaisha | Free space optical communication system |
| CN102004364A (en) * | 2009-09-01 | 2011-04-06 | 上海伟钊光学科技有限公司 | Demodulation mode for realizing coherent light receiving |
| CN102158286A (en) * | 2011-01-21 | 2011-08-17 | 中国科学院上海光学精密机械研究所 | Reflection type differential phase shift key control coherent receiving machine |
-
2012
- 2012-03-29 CN CN201210087442.5A patent/CN102624447B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0653852A1 (en) * | 1993-11-16 | 1995-05-17 | Canon Kabushiki Kaisha | Free space optical communication system |
| CN102004364A (en) * | 2009-09-01 | 2011-04-06 | 上海伟钊光学科技有限公司 | Demodulation mode for realizing coherent light receiving |
| CN102158286A (en) * | 2011-01-21 | 2011-08-17 | 中国科学院上海光学精密机械研究所 | Reflection type differential phase shift key control coherent receiving machine |
Non-Patent Citations (1)
| Title |
|---|
| 马小平 等: "DPSK调制/自差动零差相干探测技术克服星地激光通信中大气湍流效应的研究", 《光学学报》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107645341A (en) * | 2017-10-23 | 2018-01-30 | 南京航空航天大学 | Microwave photon phase detecting method, device and microwave photon phase-lock technique, device |
| CN107645341B (en) * | 2017-10-23 | 2019-09-17 | 南京航空航天大学 | Microwave photon phase detecting method, device and microwave photon phase-lock technique, device |
| CN109239931A (en) * | 2018-11-06 | 2019-01-18 | 上海联能光子技术有限公司 | A kind of automated production apparatus and method based on Free Space Optics bridge |
| CN113508327A (en) * | 2019-02-01 | 2021-10-15 | 统雷有限公司 | High dynamic range imaging |
| CN109916743A (en) * | 2019-03-21 | 2019-06-21 | 京东方科技集团股份有限公司 | Dynamic mechanical measuring device, measurement method and calculating equipment |
| CN113206387A (en) * | 2021-04-22 | 2021-08-03 | 电子科技大学 | Wide-bandwidth terahertz quasi-optical sum-difference comparator |
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