CN102594456A - Self-phase differential interference optical signal receiving device - Google Patents
Self-phase differential interference optical signal receiving device Download PDFInfo
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- CN102594456A CN102594456A CN2012100874410A CN201210087441A CN102594456A CN 102594456 A CN102594456 A CN 102594456A CN 2012100874410 A CN2012100874410 A CN 2012100874410A CN 201210087441 A CN201210087441 A CN 201210087441A CN 102594456 A CN102594456 A CN 102594456A
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Abstract
A self-phase differential interference optical signal receiving device is formed by a block-shaped polarization beam combiner, a reflector, a pupil imaging lens group, a wave plate and a photoelectric detector. The self-phase differential interference optical signal receiving device adopts balanced receiving of light and real-time control on stationary-phase phase, is short in time delay distance and adjustable in differential circuit optical path, and can meet requirements for high-speed communication.
Description
Technical field
The present invention relates to the light signal demodulation, particularly a kind of from phase difference interference light signal receiving system.
Background technology
In free space laser communication, laser transmission receives the influence of factors such as atmospheric turbulance during through atmospheric channel, and beam wave surface produces distortion, and quality seriously descends.The laser signal reception need overcome atmospheric turbulance.The method that adopts at present mainly contains and reduces to receive bore, adaptive optics wavefront correction, DPSK modulation signal from methods such as differential receptions.The present invention adopts the DPSK modulation from differential reception, need not add local oscillation signal, and is simple and compact for structure, be easy to realize, and be the developing direction of light receiving signal in the following laser communication.
Previous technical research [1] is (referring to High-data-rate systems for space applications; Proc.SPIE; Vol.2381,38,1995) adopt the DPSK modulation in the star ground laser communication described in; 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 on-off keying (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.
Previous technical research [2] is (referring to Adaptive optics and ESA ' s optical ground station; Proc.SPIE, Vol.7464,746406; 2009) the DPSK modulation is adopted in the star ground laser communication described in; Its device is Mach-Zehnder interferometers or michelson interferometer structure, should guarantee in the work that the control precision of the difference of two brachiums is far superior to quarter-wave, is about 0.2 micron.But 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.In addition, in technical research [2], use two groups of 4f set of lenses, bigger aberration is introduced on the corrugated, technology realizes going up difficult, is unfavorable for reducing the error rate of signal of communication.
Previous technical research [3] (phase compensation polarization spectro 2 * 4 90 ° Free Space Optics bridger, optics journal, Vol.29; 3291～3294,2009) the free space bridger described in, with local oscillator light and flashlight synthetic after; Output four bundles are wherein formed homophase passage and orthogonal channel in twos, and balance receives; And need aberration 90 degree between homophase passage and the orthogonal channel, produce the mutually required error signal of lock, the present invention has improved this point.In the present invention, the flashlight of flashlight and delay self is synthetic, realizes balance reception and lock mutually.
Summary of the invention
The scheme that The present invention be directed to optical receiving end receiving optical signals in the free space laser communication and take; The technical problem that solves is to overcome existing technical difficulty; Provide a kind of from phase difference interference light signal receiving system, this device utilizes differential phase keying (DPSK) to separate dim signal for mechanism.
The solution of this novel invention technology realizes like this.
A kind of from phase difference interference light signal receiving system, its characteristics are that its formation comprises:
First polarization beam apparatus; The direction of advance of the first polarization beam splitting face of this first polarization beam apparatus and the circularly polarized light of input is 45 °; This first polarization beam apparatus is divided into orthogonal reverberation of plane of polarization and transmitted light with the circularly polarized light of described input;, incide on the polarization beam splitting face of second polarization beam apparatus through first lens, first speculum, second speculum, second lens, position phase micromanipulator, first quarter-wave plate, second polarization beam apparatus along described reverberation direction; Described transmitted light incides on the second polarization beam splitting face of second polarization beam apparatus through first polarization beam apparatus, the 1/1st wave plate, second polarization beam apparatus; This two-beam is producing horizontal branches light beam and vertical branch road light beam through the second polarization beam splitting face; Described vertical branch road light beam is divided into orthogonal reverberation of plane of polarization and transmitted light by the 4th polarization beam splitting face of the 4th polarization beam apparatus behind the 1/3rd wave plate; Received by the 3rd photodetector and the 4th photodetector respectively, the output of described the 3rd photodetector and the 4th photodetector links to each other with the input of orthogonal balanced circuit; The output of this orthogonal balanced circuit links to each other with mlultiplying circuit second input;
Described horizontal branches light beam is through the 1/2nd wave plate and the 3rd polarization beam apparatus; The 3rd polarization beam splitting face by the 3rd polarization beam apparatus is divided into orthogonal reverberation of plane of polarization and transmitted light; Received by first photodetector and second photodetector respectively, the output of described first photodetector and second photodetector links to each other with the input of homophase balancing circuitry; The output of this homophase balancing circuitry links to each other with the input of data processing circuit, described mlultiplying circuit first input end respectively, and the output of described mlultiplying circuit links to each other with the control end of fine phase modulator through phase lock circuitry (20);
Constitute 2 * 490 ° of Free Space Optics bridgers by described the 1/1st wave plate, first quarter-wave plate, second polarization beam apparatus, the 1/2nd wave plate, the 1/3rd wave plate, the 3rd polarization beam apparatus and the 4th polarization beam apparatus; The optical axis direction of described the 1/1st wave plate, the 1/2nd wave plate, the 1/3rd wave plate becomes 22.5 degree with the polarization of incident light direction; Polarised light through 1/2nd wave plates after, polarization direction rotation 45 degree.
Described first lens and second lens have the same focal length f, constitute the pupil imaging set of lenses, are confocal set of lenses, and its spacing is 2 times of focal length 2f; Described first lens, first speculum, second lens, second speculum are formed the light path module; Begin from the described first polarization beam splitting face, be called the difference branch road through the light path of described first lens, first speculum, second lens, second speculum to described second plane of polarization, described light path module is installed on the identical platform; This platform is divided into guide rail; To adjust the light path of said difference branch road, described light path module and message transmission rate G are complementary, and the focal distance f of different light path modules is different; Corresponding different data transmission rates, and satisfy the following relationship formula:
Wherein: f is the focal length of set of lenses, and c is the light velocity, and G is a message transmission rate, L
1For described reverberation from the first polarization beam splitting face along the distance of difference branch road to second plane of polarization, L
2Be the distance of described transmitted light from the first polarization beam splitting face to second plane of polarization.
Described accurate position phase controller 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, photodetector, homophase balancing circuitry, orthogonal balanced circuit, data processing circuit and phase lock circuitry partly are matured product or technology, can buy.
The flashlight of supposing reception is circularly polarized light (if other polarization state need convert circularly polarized light into).Through polarization beam apparatus the time, reverberation is an orthogonal polarized light, and transmitted light is a horizontal polarization light.
Technique effect of the present invention is following:
Apparatus of the present invention adopt the differential phase keying (DPSK) modulation from phase difference interference light signal device; The innovation part at first is to form transmission-type difference light circuit by polarizer and pupil imaging set of lenses; Carry out self synthetic differential interferometry decoded information from phase place and phase retardation; Overcome the influence that absolute phase distortion receives signal, reduced the error rate.Secondly, this device is only introduced one group of 4f lens, and is simple in structure, reduces the disturbance of lens surface error to the light beam phase place.This incident optical signal is through behind the polarization interference; Four road polarization interference light of output are received by the two-way balance receiver, form homophase passage and orthogonal channel, differ 90 degree between the two; One road signal produces the mutually required error signal of lock; Keep the optical path difference of difference two branch roads stable through the phase place micromanipulator, improve the interference light contrast, and keep the precision of system.Other paths output is from the data-signal of phase decoding.In addition, this device realizes that the balance of light receives and the surely real-time control of phase place, and the time delay distance is short, the differential loop light path is adjustable, can satisfy the requirement of high rate communication.
Description of drawings
Fig. 1 is the concrete structure sketch map of the present invention from phase difference interference light signal receiving system.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further explain, but should not limit protection scope of the present invention with this.
Consult Fig. 1 earlier, Fig. 1 is the concrete structure sketch map of the present invention from phase difference interference light signal receiving system.It also is the main structure sketch map of the embodiment of the invention.Visible by figure, the present invention is a kind of from phase difference interference light signal receiving system, and its formation comprises:
First polarization beam apparatus 1; The direction of advance of the first polarization beam splitting face 1a of this first polarization beam apparatus 1 and the circularly polarized light of input is 45 °; This first polarization beam apparatus 1 is divided into orthogonal reverberation of plane of polarization and transmitted light with the circularly polarized light of described input;, incide on the second polarization beam splitting face 5a of second polarization beam apparatus 5 through the first lens 7a, first speculum 6, second speculum 8, the second lens 7b, position phase micromanipulator 21, first quarter-wave plate 3, second polarization beam apparatus 5 along described reverberation direction; Described transmitted light incides on the second polarization beam splitting face 5a of second polarization beam apparatus 5 through first polarization beam apparatus 1, the 1/1st wave plate 2, second polarization beam apparatus 5; This two-beam is producing horizontal branches light beam and vertical branch road light beam through the second polarization beam splitting face 5a; Described vertical branch road light beam is divided into orthogonal reverberation of plane of polarization and transmitted light by the 4th polarization beam splitting face 14a of the 4th polarization beam apparatus 14 behind the 1/3rd wave plate 9; Received by the 3rd photodetector 15 and the 4th photodetector 16 respectively, the output of described the 3rd photodetector 15 and the 4th photodetector 16 links to each other with the input of orthogonal balanced circuit 17; The output of this orthogonal balanced circuit 17 links to each other with mlultiplying circuit 18 second inputs; Described horizontal branches light is through the 1/2nd wave plate 4 and the 3rd polarization beam apparatus 10; The 3rd polarization beam splitting face 10a by the 3rd polarization beam apparatus is divided into orthogonal reverberation of plane of polarization and transmitted light; Received by first photodetector 11 and second photodetector 12 respectively, the output of described first photodetector 11 and second photodetector 12 links to each other with the input of homophase balancing circuitry 13; The output of this homophase balancing circuitry 13 links to each other with the input of data processing circuit 19, described mlultiplying circuit 18 first input ends respectively, and the output of described mlultiplying circuit 18 links to each other through the control end of phase lock circuitry 20 with fine phase modulator 21;
By described the 1/1st wave plate 2, first quarter-wave plate 3; Second polarization beam apparatus 5, the 1/2nd wave plate 4, the 1/3rd wave plate 9, the 3rd polarization beam apparatus 10, the 4th polarization beam apparatus 14 constitute 2 * 490 ° of Free Space Optics bridgers, and the optical axis direction of described the 1/1st wave plate 2, the 1/2nd wave plate 4, the 1/3rd wave plate 9 becomes 22.5 to spend with the polarization of incident light direction.
The course of work of the present invention is:
The direction of advance of circularly polarized light that the flashlight that receives incides the first polarization beam splitting face 1a and the input of first polarization beam apparatus, 1, the first polarization beam apparatus 1 is 45 °.This first polarization beam apparatus 1 is divided into orthogonal reverberation of plane of polarization and transmitted light with described input circularly polarized light.The reverberation of vertical polarization attitude incides on the second polarization beam splitting face 5a of second polarization beam apparatus 5 through first speculum 6, the first lens 7a, second speculum 8, the second lens 7b, first quarter-wave plate 3, second polarization beam apparatus 5; The transmitted light of described horizontal polarization attitude incides on the second beam-splitting surface 5a of second polarization beam apparatus 5 through the 1/1st wave plate 2, second polarization beam apparatus 5.This two-beam is at the two-beam that produces horizontal component (comprising the flashlight of horizontal polarization attitude and the flashlight of vertical polarization attitude) branch road and vertical component (comprising the flashlight of horizontal polarization attitude and the flashlight of vertical polarization attitude) branch road through the second polarization beam splitting face 5a.
Wherein vertical component branch road (comprising the flashlight of horizontal polarization attitude and the flashlight of vertical polarization attitude) light is successively through the 1/3rd wave plate 9, the 4th polarization beam apparatus 14; The 4th polarization beam splitting face 14a is divided into orthogonal reverberation of plane of polarization and transmitted light to vertical component; Receive interference light intensity by the 3rd photodetector 15 and the 4th photodetector 16 respectively behind the polarization interference; Respectively light signal is transformed two path signal, be input to orthogonal balanced circuit 17;
An other horizontal component (comprising the flashlight of horizontal polarization attitude and the flashlight of vertical polarization attitude) branch road is through the 1/2nd wave plate 4, the 3rd polarization beam apparatus 10; The 3rd polarization beam splitting face 10a is divided into orthogonal reverberation of plane of polarization and transmitted light to horizontal component branch road light; Behind the polarization interference; Respectively light signal is transformed two path signal, receive interference light intensity by first photodetector 11 and second photodetector 12 respectively, be transferred to homophase balancing circuitry 13.Electrical signal data through homophase balancing circuitry 13 is handled is a part of through behind the data processing circuit 19, the data message that obtains decoding; Another part electrical signal data and insert mlultiplying circuit 18 together through orthogonal balanced circuit 17 processed electrical signals; This mlultiplying circuit 18 feeds back to phase lock circuitry 20 after two path signal is processed, and the lock phase signal of telecommunication is as the control signal of fine phase modulator 21.Accurate phase modulator 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.
Described first polarization beam apparatus 1, the 3rd polarization beam apparatus 10, the 4th polarization beam apparatus 14 and second polarization beam apparatus 5 all glue together and stick on together, and shape all is a square, and its length of side is L.
The described first lens 7a and the second lens 7b have the same focal length f, constitute the pupil imaging set of lenses together, are confocal set of lenses, and its spacing is 2 times focal length 2f.This pupil imaging set of lenses exit pupil position is at the second polarization beam splitting face 5a, and the object distance of emergent pupil is one times of focal length, and promptly the second lens 7b is f to the distance of the second polarization beam splitting face 5a.
The light path module that described first speculum 6, the first lens 7a, second speculum 8, the second lens 7b form is integrated on the same platform.Lay guide rail below this platform, move along direction precision perpendicular to the transmission level branch road for this platform.The light path module will be complementary with message transmission rate G, and the focal distance f of different light path modules is different, corresponding different data transmission rates, and satisfy the following relationship formula:
Wherein f is the focal length of set of lenses, and c is the light velocity, and G is a message transmission rate, makes L
1By reverberation from the first polarization beam splitting face 1a through light path coarse regulation branch road to the second polarization beam splitting face 5a the diffraction distance of process; L
2By transmitted light from the first polarization beam splitting face 1a through the 1/1st wave plate 2 to second polarization beam splitting face 5a the diffraction distance of process, and L
2=L.
Claims (3)
1. one kind from phase difference interference light signal receiving system, is characterised in that its formation comprises:
First polarization beam apparatus (1); The first polarization beam splitting face (1a) of this first polarization beam apparatus (1) is 45 ° with the direction of advance of the circularly polarized light of input; This first polarization beam apparatus (1) is divided into orthogonal reverberation of plane of polarization and transmitted light with the circularly polarized light of described input;, incide on the second polarization beam splitting face (5a) of second polarization beam apparatus (5) through first lens (7a), first speculum (6), second speculum (8), second lens (7b), position phase micromanipulator (21), first quarter-wave plate (3), second polarization beam apparatus (5) along described reverberation direction; Described transmitted light incides on the second polarization beam splitting face (5a) of second polarization beam apparatus (5) through first polarization beam apparatus (1), the 1/1st wave plate (2), second polarization beam apparatus (5); This two-beam is producing horizontal branches light beam and vertical branch road light beam through the second polarization beam splitting face (5a); Described vertical branch road light beam is divided into orthogonal reverberation of plane of polarization and transmitted light by the 4th polarization beam splitting face (14a) of the 4th polarization beam apparatus (14) behind the 1/3rd wave plate (9); Received by the 3rd photodetector (15) and the 4th photodetector (16) respectively, the output of described the 3rd photodetector (15) and the 4th photodetector (16) links to each other with the input of orthogonal balanced circuit (17); The output of this orthogonal balanced circuit (17) links to each other with mlultiplying circuit (18) second inputs;
Described horizontal branches light is through the 1/2nd wave plate (4) and the 3rd polarization beam apparatus (10); The 3rd polarization beam splitting face (10a) by the 3rd polarization beam apparatus is divided into orthogonal reverberation of plane of polarization and transmitted light; Received by first photodetector (11) and second photodetector (12) respectively, the output of described first photodetector (11) and second photodetector (12) links to each other with the input of homophase balancing circuitry (13); The output of this homophase balancing circuitry (13) links to each other with the input of data processing circuit (19), described mlultiplying circuit (18) first input end respectively, and the output of described mlultiplying circuit (18) links to each other through the control end of phase lock circuitry (20) with fine phase modulator (21);
By described the 1/1st wave plate (2), first quarter-wave plate (3); Second polarization beam apparatus (5), the 1/2nd wave plate (4), the 1/3rd wave plate (9), the 3rd polarization beam apparatus (10), the 4th polarization beam apparatus (14) constitute 2 * 490 ° of Free Space Optics bridgers, and the optical axis direction of described the 1/1st wave plate (2), the 1/2nd wave plate (4), the 1/3rd wave plate (9) becomes 22.5 degree with the polarization of incident light direction.
2. according to claim 1 from phase difference interference light signal receiving system; It is characterized in that described first lens (7a) have identical focal distance f with second lens (7b); Constitute pupil imaging set of lenses (7), be confocal set of lenses, its spacing is 2 times of focal length 2f; Described first lens (7a), first speculum (6), second lens (7b), second speculum (8) are formed the light path module; Offer from the described first polarization beam splitting face (1a), be called the difference branch road through the light path of described first lens (7a), first speculum (6), second lens (7b), second speculum (8) to described second plane of polarization (5a), described light path module is installed on the identical platform; This platform is divided into guide rail; To adjust the light path of said difference branch road, described light path module and message transmission rate G are complementary, and the focal distance f of different light path modules is different; Corresponding different data transmission rates, and satisfy the following relationship formula:
Wherein: f is the focal length of set of lenses, and c is the light velocity, and G is a message transmission rate, L
1For described reverberation from the first polarization beam splitting face (1a) along the distance of difference branch road to second plane of polarization (5a), L
2Be the distance of described transmitted light from the first polarization beam splitting face (1a) to second plane of polarization (5a).
3. according to claim 1 from phase difference interference light signal receiving system; It is characterized in that described accurate position phase controller (21) is a phase control device that the parallel optical glass flat boards in two surfaces that perhaps rotated through driven by motor by the electrooptic modulation crystal constitute, running accuracy is 1 microradian.
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Cited By (4)
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| CN104601247B (en) * | 2014-12-22 | 2017-04-05 | 中国科学院上海光学精密机械研究所 | Local oscillator enhancement mode differential signal reception device |
| CN108286939A (en) * | 2018-02-10 | 2018-07-17 | 北京工业大学 | A kind of laser traces measurement optical system Energy Analysis for High based on ZEMAX emulation |
| CN115542564A (en) * | 2022-11-03 | 2022-12-30 | 北京中科国光量子科技有限公司 | Polarization-independent space light self-homodyne interferometer |
| CN115955280A (en) * | 2023-03-13 | 2023-04-11 | 万事通科技(杭州)有限公司 | Optical fiber channel eavesdropping detection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108286939B (en) * | 2018-02-10 | 2020-04-03 | 北京工业大学 | Energy analysis method of laser tracking measurement optical system based on ZEMAX simulation |
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| CN115955280A (en) * | 2023-03-13 | 2023-04-11 | 万事通科技(杭州)有限公司 | Optical fiber channel eavesdropping detection device |
| CN115955280B (en) * | 2023-03-13 | 2023-06-20 | 万事通科技(杭州)有限公司 | Optical fiber channel eavesdropping detection device |
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