CN102098095B - Transmission type differential phase shift keying coherent receiver - Google Patents
Transmission type differential phase shift keying coherent receiver Download PDFInfo
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- 238000003384 imaging method Methods 0.000 claims abstract description 10
- 230000010287 polarization Effects 0.000 claims description 21
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Abstract
A transmission-type differential phase shift keying coherent receiver comprises a transmission-type differential optical circuit, a 2 x 4 optical bridge, a photoelectric detector, two channel balancing circuits and a phase-locked circuit. The invention adopts a non-optical fiber free space structure for receiving optical signals in a space laser communication receiver, adopts a transmission type optical loop consisting of a polarizing device and a pupil imaging lens, and realizes the balanced receiving of light together with a 2 multiplied by 490 degree free space optical bridge; the phase-locked circuit is used for controlling the optical path precision regulator in real time, so that the optical path difference is kept stable, and the precision of the system is ensured.
Description
Technical field
The present invention relates to laser space communication, be a kind of transmission-type differential phase keying (DPSK) (DPSK) signal free space light coherent receiver, be made up of the differential light circuit of transmission-type, 2 × 4 optical bridging devices, photodetector, two balance reception passages, phase lock circuitries.Receive for the light signal in laser space communication receiver, treated circuit, output signal (coding).
Background technology
At first technology [1] (phase compensation polarization spectro 2 × 490 ° of Free Space Optics bridgers, Acta Optica, Vol.29,3291 ~ 3294,2009) the free space bridger described in is by after flashlight and local oscillator light compositing, export four bundles, wherein form homophase passage and orthogonal channel between two, balance reception.Homophase passage with differ 90 degree between orthogonal channel, produce phase-locked required error signal.In the present invention, need the flashlight self of flashlight and time delay to synthesize, realize balance reception and phase-locked, need to improve.
At first technology [2] (High-data-rate systems for space applications, Proc.SPIE, Vol.2381,38,1995) DPSK is adopted to modulate in the satellite-ground laser communication described in, receiver adopts fiber amplifier and the demodulation of optical-fiber type Mach-Zehnder interferometers, and balance reception, remolding sensitivity on-off keying (OOK) modulates direct detection method height 3dB.But the corrugated Quality Down under atmospheric perturbation, optical coupling efficiency reduces, and has a strong impact on sensitivity, makes the ability of this modulation system disturbance rejection of DPSK be not fully utilized.
At first technology [3] (Adaptive optics and ESA ' s optical ground station, Proc.SPIE, Vol.7464,746406,2009) the DPSK demodulation described in adopts Mach-Zehnder interferometers or the Michelson's interferometer of free-space structure, should ensure in work that the control precision of the difference of two brachiums is far superior to quarter-wave, be about 0.2 micron.But lack accurate adjusting device and phase-locked loop in structure, cannot system accuracy be ensured, can not adjust in real time.Do not have balance reception, cannot remove DC component, sensitivity is lower simultaneously.
Summary of the invention
The technical problem to be solved in the present invention is the difficulty overcoming above-mentioned prior art, provides a kind of transmission-type differential phase shift keying coherent receiver, receives, keep optical path difference to stablize, ensure system accuracy to realize photo-equilibrium.
Technical solution of the present invention is as follows.
A kind of transmission-type differential phase shift keying coherent receiver, feature is that its formation comprises:
First polarization beam apparatus, the incident light of reception is divided into reverberation and transmitted light by this first polarization beam apparatus, by the first lens successively along reverberation direction, first speculum, second lens, the light path module of the second speculum composition, accurate position phase control device successively in described transmitted light direction, short focus lens group is formed by lens and lens, after the two-beam exported by described light path module and short focus lens group incides 2 × 490 ° of Free Space Optics bridgers, the 4 bundle light exported are respectively by the first photodetector, second photodetector, 3rd photodetector and the 4th photoelectric detector, the output termination vertical balanced circuit input of the 3rd described photodetector and the 4th photodetector, the output of this vertical balanced circuit is connected with the input of mlultiplying circuit, the first described photodetector is connected with the input of homophase balancing circuitry with the output of the second photodetector, the output of this homophase balancing circuitry is connected with the input of data circuit process with described mlultiplying circuit, and the output of described mlultiplying circuit is connected through the control end of phase lock circuitry with described control accurate position phase control device.
The first described lens and the second lens have the same focal length f1, and form pupil imaging focal length set of lenses, be confocal set of lenses, its spacing is 2 times of focal length 2f1.
Described lens and lens are lens that focal length is identical, and the focal length of lens is f2, and form the short focus lens group of pupil imaging, be confocal set of lenses, its spacing is 2 times of focal length 2f2.
The light path module of the first described lens, the first speculum, the second lens, the second speculum composition is based upon on same platform, divide into guide rail, mobile accuracy is 100 microns, for the light path module of mating with message transmission rate G, the focal distance f 1 of different light path module is different, and meets following relationship:
wherein f2 is short set of lenses focal length, and c is the light velocity, and G is message transmission rate.
Described accurate position phase control device is the optical element of printing opacity, is electrooptic modulation crystal, or the two parallel flat of optical glass.
Technique effect of the present invention is as follows:
The present invention adopts non-optical fiber free-space structure, for the demodulation of laser space communication dpsk signal.Adopt polarizer and pupil imaging lens composition transmission-type light circuit, together with 2 × 490 ° of Free Space Optics bridgers, achieve the balance reception of light; Utilize phase lock circuitry to control the accurate adjuster of light path in real time, maintain optical path difference and stablize, ensure that the precision of system.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention
Fig. 2 is the concrete structure schematic diagram of one embodiment of the invention
Embodiment
Below in conjunction with embodiment and accompanying drawing, the invention will be further described, but should not limit the scope of the invention with this.
First refer to Fig. 1, transmission-type differential phase shift keying coherent receiver of the present invention, its formation comprises:
The incident light of reception is divided into reverberation and transmitted light by the first polarization beam apparatus 1, by the first lens 9a successively along reverberation direction, first speculum 8, second lens 9b, the light path module 23 that second speculum 10 forms, accurate position phase control device 2 successively in described transmitted light direction, short focus lens group 3 is formed by lens 3a and lens 3b, after the two-beam exported by described light path module 23 and short focus lens group 3 incides 2 × 490 ° of Free Space Optics bridgers 24, export 4 bundle light respectively by the first photodetector 14, second photodetector 15, 3rd photodetector 16 and the 4th photodetector 17 receive, output termination vertical balanced circuit 19 input of the 3rd described photodetector 16 and the 4th photodetector 17, the output of this vertical balanced circuit 19 is connected with the input of mlultiplying circuit 22, the first described photodetector 14 is connected with the input of homophase balancing circuitry 18 with the output of the second photodetector 15, the output of this homophase balancing circuitry 18 is connected with the input of data circuit process 21 with described mlultiplying circuit 22, and the output of described mlultiplying circuit 22 is connected through the control end of phase lock circuitry 20 with described control accurate position phase control device 2.
Refer to Fig. 2, Fig. 2 is the concrete structure schematic diagram of one embodiment of the invention, the present embodiment transmission-type differential phase shift keying coherent receiver concrete structure includes the concrete structure of 2 × 490 ° of described Free Space Optics bridgers 24, and it is made up of the 1/1st wave plate 4, second polarization beam apparatus the 5, the 1/2nd wave plate 6, the 3rd polarization beam apparatus 7, quarter-wave plate the 11, the 1/3rd wave plate 12 and the 4th polarization beam apparatus 13.
Orthogonal channel is formed through accurate position phase control device 2, pupil imaging short focus lens group the 3, the 1/1st wave plate 4, second polarization beam apparatus the 5, the 1/2nd wave plate 6 and the 3rd polarization beam apparatus 7 by the transmitted light through the first polarization beam apparatus 1, the signal of telecommunication is converted to through the 3rd photodetector 16 and the 4th photodetector 17,3rd photodetector 16 and the 4th photodetector 17 are generally PIN photodiode, subtracted each other by the signal of telecommunication of the 3rd photodetector 16 and the 4th photodetector 17, processed by vertical balanced circuit 19, at the light that the reflecting surface 1a of the first polarization beam apparatus 1 reflects, through the first speculum 8, pupil imaging focal length set of lenses 9, second speculum 10, quarter-wave plate 11, second polarizing mirror 5, / 3rd wave plate 12, 4th polarization beam apparatus 13 forms homophase passage, the signal of telecommunication is converted to through the first photodetector 14 and the second photodetector 15, first photodetector 14 and the second photodetector 15 are generally PIN photodiode, subtracted each other by the signal of telecommunication of the first photodetector 14 and the second photodetector 15, processed by homophase balancing circuitry 18, the signal of telecommunication after the process of homophase balancing circuitry, a part exports and exports data through data processing circuit 21, the signal of telecommunication after another part processes with orthogonal balanced treatment circuit 19 is multiplied at mlultiplying circuit 22, processed by phase lock circuitry 20, as the control signal of accurate position phase adjuster 2, stablize the optical path difference in transmitted light loop.
As shown in Figure 2 described.The entrance pupil position of described focal length set of lenses 9 and short focus lens group 3 overlaps as 1a, and exit pupil position overlaps as 7a and 13a, and the object distance of entrance pupil is 1 times of focal length.Wherein photodetector, electronics are matured product or technology, can buy or entrust development.
Assuming that receiving light is circularly polarized light (if be other polarization state, needing to be converted to circularly polarized light).Through polarization beam apparatus, reverberation is orthogonal polarized light, and transmitted light is horizontal polarization light.
The first described lens 9a and the second lens 9b has the same focal length f1, and form pupil imaging focal length set of lenses 9, be confocal set of lenses, its spacing is 2 times of focal length 2f1.
Described lens 3a and lens 3b are the lens that focal length is identical, and the focal length of lens is f2, and form the short focus lens group 3 of pupil imaging, be confocal set of lenses, its spacing is 2 times of focal length 2f2.
The light path module 23 that the first described lens 9a, the first speculum 8, second lens 9b, the second speculum 10 form is based upon on same platform, divide into guide rail, mobile accuracy is 100 microns, for the light path module 23 of mating with message transmission rate G, the focal distance f 1 of different light path module is different, and meets following relationship:
wherein f2 is short set of lenses focal length, and c is the light velocity, and G is message transmission rate.
Described accurate position phase control device 2 is the optical element of printing opacity, and one is electrooptic modulation crystal, and change bias voltage, by the change in optical path length of crystal, precision is higher than quarter-wave.Another kind is the two parallel flat of optical glass, and by precision rotation angle, change light by dull and stereotyped light path, precision is far above quarter-wave.
The 1/1st described wave plate the 4, the 1/2nd wave plate 6 becomes 22.5 degree with the optical axis direction of the 1/3rd wave plate 12 with incident light polarization direction.Polarised light is after 1/2nd wave plates, and polarization direction rotates 45 degree.Then through polarization beam apparatus, orthogonal polarized light reflects, horizontal polarization Transmission light.
Claims (2)
1. a transmission-type differential phase shift keying coherent receiver, is characterised in that its formation comprises:
First polarization beam apparatus (1), the incident light of reception is divided into reverberation and transmitted light by this first polarization beam apparatus (1), by the first lens (9a) successively along reverberation direction, first speculum (8), second lens (9b), the light path module (23) that second speculum (10) forms, accurate position phase control device (2) successively in described transmitted light direction, short focus lens group (3) is formed by the first short focus lens (3a) and the second short focus lens (3b), after the two-beam exported by described light path module (23) and short focus lens group (3) incides 2 × 4 90 ° of Free Space Optics bridgers (24), export 4 bundle light respectively by the first photodetector (14), second photodetector (15), 3rd photodetector (16) and the 4th photodetector (17) receive, the 3rd described photodetector (16) and output termination vertical balanced circuit (19) input of the 4th photodetector (17), the output of this vertical balanced circuit (19) is connected with the input of mlultiplying circuit (22), described the first photodetector (14) is connected with the input of homophase balancing circuitry (18) with the output of the second photodetector (15), the output of this homophase balancing circuitry (18) is connected with the input of data circuit process (21) with described mlultiplying circuit (22), and the output of described mlultiplying circuit (22) is connected through the control end of phase lock circuitry (20) with described accurate position phase control device (2),
Described the first lens (9a) and the second lens (9b) have the same focal length f1, and form pupil imaging focal length set of lenses (9), be confocal set of lenses, its spacing is 2 times of focal length 2f1;
Described first short focus lens (3a) is the lens that focal length is identical with the second short focus lens (3b), and the focal length of lens is f2, and form the short focus lens group (3) of pupil imaging, be confocal set of lenses, its spacing is 2 times of focal length 2f2;
The light path module (23) that described the first lens (9a), the first speculum (8), the second lens (9b), the second speculum (10) form is based upon on same platform, divide into guide rail, mobile accuracy is 100 microns, for the light path module (23) of mating with message transmission rate G, first lens (9a) of this light path module and the focal distance f 1 of the second lens (9b) meet following relationship:
wherein f2 is the first short focus lens (3a) of short set of lenses and the focal length of the second short focus lens (3b), and c is the light velocity, and G is message transmission rate.
2. transmission-type differential phase shift keying coherent receiver according to claim 1, is characterized in that described accurate position phase control device (2) is electrooptic modulation crystal, or the two parallel flat of optical glass.
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| CN201110024589.5A CN102098095B (en) | 2011-01-21 | 2011-01-21 | Transmission type differential phase shift keying coherent receiver |
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| CN201110024589.5A CN102098095B (en) | 2011-01-21 | 2011-01-21 | Transmission type differential phase shift keying coherent receiver |
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| CN102158286B (en) * | 2011-01-21 | 2014-06-25 | 中国科学院上海光学精密机械研究所 | Reflective Differential Phase Shift Keying Coherent Receiver |
| CN103792657A (en) * | 2012-10-30 | 2014-05-14 | 福州高意通讯有限公司 | Optical path length fine tuning structure and application structure thereof |
| CN105721051B (en) * | 2016-01-19 | 2018-05-08 | 中国科学院上海光学精密机械研究所 | Free space coherent light communication detection device based on 2 × 2 180 ° of optical bridging devices |
| CN108227247B (en) * | 2018-03-15 | 2023-11-17 | 中国科学院武汉物理与数学研究所 | 8-range frequency shifter based on acousto-optic modulation |
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Non-Patent Citations (2)
| Title |
|---|
| 差分相移键控信号的数字相干光检测与色散补偿研究与实现;冯勇等;《中国激光》;20100228;第37卷(第2期);第471-476页 * |
| 晶体双折射自由空间2_490_光学桥接器;侯培陪等;《光学学报》;20101231;第30卷(第12期);第3413-3418页 * |
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