CN102624447B - 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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- CN102624447B CN102624447B CN201210087442.5A CN201210087442A CN102624447B CN 102624447 B CN102624447 B CN 102624447B CN 201210087442 A CN201210087442 A CN 201210087442A CN 102624447 B CN102624447 B CN 102624447B
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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 light signal demodulation, particularly a kind of double light path is controlled differential interferometry receiving system in real time.
Background technology
Free space laser communication, when laser transmission is passed through atmospheric channel, is subject to the impact of the factors such as atmospheric turbulance, and beam wave surface produces distortion, quality degradation.Receive laser signal and need to overcome atmospheric turbulance, the method adopting at present mainly contains methods such as reducing Receiver aperture, adaptive optics wavefront correction, the reception of differential phase keying (DPSK) (DPSK) modulation signal Self-differential.
Formerly technology [1] is (referring to High-data-rate systems for space applications, Proc.SPIE, Vol.2381,38,1995) in described star ground laser communication, adopt DPSK modulation, receiver adopts fiber amplifier and optical-fiber type Mach-Zehnder interferometers solution balancing to receive, the high 3dB of remolding sensitivity monitoring switch (OOK) modulation direct detection method.But the corrugated Quality Down after atmospheric turbulance disturbance, optical coupling efficiency is lower, affects sensitivity, makes DPSK modulator approach Ability of Resisting Disturbance 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) described star ground laser communication adopts DPSK modulation, 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 work is far superior to quarter-wave, is about 0.2 micron.In this device, use two groups of set of lenses, make corrugated introduce larger aberration, technology realizes upper difficult, reduces communication accuracy rate.And this structure lacks accurate device and the phase-locked loop adjusted, cannot guarantee system accuracy, can not adjust in real time.Do not have balance to receive simultaneously, cannot remove DC component, sensitivity is lower.
Summary of the invention
The present invention be directed to free space laser communication, overcome the difficulty of above-mentioned formerly technology, provide a kind of double light path to monitor in real time differential interference receiving system.This device has been realized balance reception, and monitor optical is by accurate adjustment of light path of phase lock circuitry real-time control signal light, carries out phase compensation, keeps optical path difference to stablize and system accuracy.
Technical solution of the present invention is as follows:
Double light path is controlled a 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 the orthogonal reverberation of plane of polarization and transmitted light by two described bundle input line polarised lights respectively.The reverberation of flashlight, in order through the first speculum, the second speculum, the second polarization beam apparatus, is input to the second polarization beam splitting face and reflection occurs through the 1/2nd wave plate, the 4th polarization beam apparatus, incides the 4th polarization beam splitting face; In the transmission direction of flashlight, through the first polarization beam apparatus, accurate position phase control device, the second polarization beam apparatus, be input to the second polarization beam splitting face and transmission occur through the 1/2nd wave plate, the 4th polarization beam apparatus, incide the 4th polarization beam splitting face.Difference two branch roads of flashlight are divided into the 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 is connected with the input of homophase balancing circuitry, and the input of the output of homophase balancing circuitry and data processing circuit and described mlultiplying circuit is connected.The monitor optical of an other road vertical incidence incides the first polarization beam apparatus, transmitted light is through the first speculum, the second speculum, the second polarization beam apparatus, be input to the second polarization beam splitting face and transmission occur through the 1/1st wave plate, the 3rd polarization beam apparatus, incide the 3rd polarization beam splitting face; Monitor optical incides the first polarization beam apparatus, reverberation is through the first polarization beam apparatus, accurate position phase control device, the second polarization beam apparatus, be input to the second polarization beam splitting face and reflection occur through the 1/1st wave plate, the 3rd polarization beam apparatus, incide the 3rd polarization beam splitting face.Difference two branch roads of monitor optical are divided into the orthogonal reverberation of polarization state and transmitted light during through the 3rd polarization beam splitting face, are received respectively by the first photodetector, the second photodetector.The output termination orthogonal balanced circuit of the first photodetector and the second photodetector. the output of this orthogonal balanced circuit is connected with mlultiplying circuit.The input of described mlultiplying circuit, after phase lock circuitry, is connected with the control end of the accurate position of described control phase control device.
Described input two-way light beam is inputted simultaneously, at output, exports respectively this two bundles input light simultaneously.The horizontal output of glancing incidence light, vertically incident light vertical output.Wherein a road monitoring light beam can be controlled accurate position phase control device through balancing circuitry, with this, controls the phase change of an other road signal beams differential interferometry branch road.
The first described speculum, the second speculum form optical path difference module and are based upon on unified platform, divide into guide rail, accurate mobile along the direction perpendicular to described horizontal branches for this platform.Light path module is mated with message transmission rate G, L
1the L that distance is constant, different
2corresponding different message transmission rates, meets relation:
L
1-L
2＝c/G
Wherein: L
1for the distance of difference Zhi Luduan from the first polarization beam splitting face to the second polarization beam splitting face, L
2for 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 message transmission rate.
Technique effect of the present invention is as follows:
The present invention adopts differential phase keying (DPSK) modulation double light path to control in real time differential interferometry receiving system, and this device adopts non-optical fiber free-space structure, and flashlight phase place and self differential phase are interfered decoded information, has overcome the impact that absolute phase distortion receives signal.
Its two, creationary proposition two-way optical input device, two-way light transmission is independent of each other mutually.Respectively by flashlight and monitor optical while input receiver, the output of two-way is connected with balance detection device, monitor optical synthetic signal and signal output electrical signals after mlultiplying circuit of partial decoding of h after differential interferometry wherein, input signal as phase lock circuitry, control accurate position phase control device, keep the optical path difference of difference two branch roads stable, improve flashlight from phase interference contrast.Double light path input has realized the accurate position phase control that flashlight balance received, separated 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 monitor optical wavelength, can in receiving course, stablize received power, improves receiving efficiency, is new developing direction in light signal receiving demodulation in following laser communication.
Accompanying drawing explanation
Fig. 1 is the structural representation that double light path of the present invention is controlled differential interferometry receiving system in real time.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in more detail, but should not limit the scope of the invention with this.
As seen from the figure, double light path of the present invention is controlled in real time differential interferometry receiving system and is comprised:
The polarization beam splitting face 1a of the first polarization beam apparatus 1 and the linearly polarized light direction of advance of input signal light and monitor optical are 45 °.The first polarization beam apparatus 1 is divided into the orthogonal reverberation of plane of polarization and transmitted light by two described bundle input line polarised lights (flashlight glancing incidence and monitor optical vertical incidence) respectively.
The reverberation of flashlight is in order through the first speculum 4, the second speculum 5, the second polarization beam apparatus 3, be input to the second polarization beam splitting face 3a and reflection occur through the 1/2nd wave plate 8, the 4th polarization beam apparatus 9, incide the 4th polarization beam splitting face 9a; In the transmission direction of flashlight through the first polarization beam apparatus 1, accurate position phase control device 2, the second polarization beam apparatus 3a, be input to the second polarization beam splitting face 3a and transmission occur through the 1/2nd wave plate 8, the 4th polarization beam apparatus 9, incide the 4th polarization beam splitting face 9a.The 1/2nd described wave plate 8 optical axis directions and a polarization state polarization direction of incoming signal light become 22.5 degree.When flashlight incides the 4th polarization beam splitting face 9a through difference two branch roads (now not comprising monitor optical) be divided into the orthogonal reverberation of polarization state and transmitted light, carry out respectively after polarization interference, by the 3rd photodetector 12 and the 4th photodetector 13, received, respectively light signal is converted into the two-way monitoring signal of telecommunication, be transferred in homophase balancing circuitry 14, a part of signal of telecommunication is after treatment connected with data processing circuit, the data message that final output decoding obtains; Another part signal of telecommunication is connected with the input of described mlultiplying circuit 17.
The monitor optical of an other road incident incides the first polarization beam apparatus 1, transmitted light is through the first speculum 4, the second speculum 5, the second polarization beam apparatus 3, be input to the second polarization beam splitting face 3a and transmission occur through the 1/1st wave plate 6, the 3rd polarization beam apparatus 7, incide the 3rd polarization beam splitting face 7a; Monitor optical incides the first polarization beam apparatus 1, reverberation is through the first polarization beam apparatus 1a, accurate position phase control device 2, the second polarization beam apparatus 3, be input to the second polarization beam splitting face 3a and reflection occur through the 1/1st wave plate 6, the 3rd polarization beam apparatus 7, incide the 3rd polarization beam splitting face 7a.The 1/1st described wave plate 6 optical axis directions and a polarization state polarization direction of incident monitor optical become 22.5 degree.When monitor optical incides the 3rd polarization beam splitting face 7a through difference two branch roads (now not comprising flashlight) be divided into the orthogonal reverberation of polarization state and transmitted light, carry out polarization interference, by the first photodetector 10, the second photodetector 11, received, 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 processed orthogonal balanced circuit 15 the partial data information obtaining and is processed with homophase balancing circuitry 14 data message obtaining and comprehensively feeds back in 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 by controlling crystal both end voltage so, changes light beam by the light path of crystal, fine setting branch road phase place; Also can adopt the parallel optical glass in two surfaces dull and stereotyped, lockin signal, by the dull and stereotyped minute angle of precision rotation parallel glass, changes light beam by dull and stereotyped optical path difference so, fine setting branch road phase place.With this, reach the differential phase of flashlight is compensated.
Here require described input two-way light beam to input simultaneously, at output, export respectively this two bundles input light simultaneously.The horizontal output of glancing incidence light, vertically incident light vertical output.Wherein monitor optical, at output balance detection, is controlled the phase change of accurate position phase control device 2 by phase lock circuitry 18, makes the position of differential interferometry two branch roads of flashlight meet mutually corresponding matching condition.
Distance by the first polarization beam splitting face 1a, the first speculum 4, the second speculum 5 to second polarization beam splitting face 3a is L
1, forming 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, form accurate position phase control branch road.
The first described speculum 4, the optical path difference module that the second speculum 5 forms are based upon on platform, and this divides into platform rail, accurate mobile along the direction perpendicular to described horizontal branches for this platform.Light path module is mated with message transmission rate G, L
1the L that distance is constant, different
2corresponding different message transmission rates, meets relation:
L
1-L
2＝c/G，
Wherein c is the light velocity, and G is message transmission rate.Through time difference of the two-way light of the difference light circuit output of this receiving system, equal the time interval of 1 bit transfer data, the balance of surveying and being processed by described homophase balancing circuitry 14 through the 3rd photodetector 12 and the 4th photodetector 13 receives signal and is restituted signal.
Described accurate position phase control device 2 be one by electrooptic modulation crystal or the phase control device that forms by motor braking, rotatable two surperficial collimating optics glass plates, its running accuracy is 1 microradian.
The described electronics such as accurate position phase control device 2, photodetector, homophase balancing circuitry 14, orthogonal balanced circuit 15, data processing circuit 16 and phase lock circuitry 18 are partly matured product or technology, can buy or entrust development.
A polarization state polarization direction of the 1/1st wave plate 6, the 1/2nd optical axis direction of wave plate 8 and the flashlight of incident or local oscillator light becomes 22.5 degree.Orthogonal polarised light is after 1/2nd wave plates, and polarization direction rotation 45 is spent.Flashlight and the monitor optical of supposing reception are the linearly polarized light (if other polarization state need to be converted to linearly polarized light) that polarization state 45 degree tilt.When through polarization beam apparatus, the reverberation of two-beam is orthogonal polarized light, and transmitted light is horizontal polarization light.
Claims (5)
1. double light path is controlled a differential interferometry receiving system in real time, is characterised in that its formation comprises:
The polarization beam splitting face (1a) of the first polarization beam apparatus (1) is respectively 45 ° with the linearly polarized light of flashlight of input and the direction of advance of the linearly polarized light of monitor optical, the first polarization beam apparatus (1) is divided into the orthogonal reverberation of plane of polarization and transmitted light by the linearly polarized light of the linearly polarized light of the described input signal light of quadrature incident and described monitor optical respectively, form difference branch road and the accurate branch road of controlling, described difference branch road is successively through the first speculum (4), the second speculum (5) incident the second polarization beam apparatus (3), described precision is controlled branch road successively through the first polarization beam apparatus (1), accurate position phase control device (2) incident the 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 by difference branch road and the accurate two-beam of controlling branch road, described vertical light path enters the 3rd polarization beam apparatus (7) through the 1/1st wave plate (6), at the 3rd polarization beam splitting face (7a), be divided into transmitted light and reverberation, this transmitted light and reverberation are surveyed and are received by the first photodetector (10) and the second photodetector (11) respectively, the input of the output termination orthogonal balanced circuit (15) of the first photodetector (10) and the second photodetector (11), the output of this orthogonal balanced circuit (15) is connected 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 and are received by the 3rd photodetector (12) and the 4th photodetector (13) respectively, the output of the 3rd photodetector (12) and the 4th photodetector (13) is connected with the input of homophase balancing circuitry (14), the input of the output of this homophase balancing circuitry (14) and data processing circuit (16) is connected with the second input of described mlultiplying circuit (17), the output of described mlultiplying circuit (18) is connected with the control end of described control accurate position phase control device (2) after phase lock circuitry (18).
2. double light path according to claim 1 is controlled differential interferometry receiving system in real time, it is characterized in that described flashlight and monitor optical are input in described the first polarization beam apparatus (1) device simultaneously, wherein monitor optical is at output balance detection, by phase lock circuitry (18), control the phase change of accurate position phase control device (2), make the position of flashlight after differential interferometry two branch roads meet mutually corresponding matching condition.
3. double light path according to claim 1 is controlled 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 output of this receiving system equals the time interval of modulating data 1 bit, the balance reception signal of surveying and being processed by described homophase balancing circuitry (14) through the 3rd photodetector (12) and the 4th photodetector (13) is restituted signal.
4. double light path according to claim 1 and 2 is controlled differential interferometry receiving system in real time, it is characterized in that described the first speculum (4), the second speculum (5) form optical path difference module and be based upon on unified platform, divide into guide rail, accurate mobile along the direction perpendicular to described horizontal branches for this platform, light path module is mated with message transmission rate G, L
1the L that distance is constant, different
2corresponding different message transmission rates, meets relation:
L
1-L
2=c/G,
Wherein c is the light velocity, and G is message transmission rate, L
1difference branch road length, L
2accurate position phase control branch road length.
5. double light path according to claim 1 is controlled differential interferometry receiving system in real time, it is characterized in that described accurate position phase control device (2) be one by electrooptic modulation crystal or the phase control device that forms by motor braking, the rotatable two parallel optical glass flat boards in surface, running accuracy is 1 microradian.
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| CN201210087442.5A CN102624447B (en) | 2012-03-29 | 2012-03-29 | Double-optical-path real-time control differential interference receiving device |
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| 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 |
| CN109239931B (en) * | 2018-11-06 | 2021-10-15 | 上海联能光子技术有限公司 | Automatic manufacturing device and method based on free space optical bridge |
| EP3918400A4 (en) * | 2019-02-01 | 2022-11-30 | Thorlabs, Inc. | 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 |
| CN113206387B (en) * | 2021-04-22 | 2022-10-14 | 电子科技大学 | Wide-bandwidth terahertz frequency band quasi-optical sum-difference comparator |
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 |
-
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- 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 (2)
| Title |
|---|
| 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;马小平 等;《光学学报》;20130731;第33卷(第7期);第1-8页 * |
| 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》.2013,第33卷(第7期), |
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