CN105162522B - Phase-locked local cross-polarization free space coherent light communication device - Google Patents
Phase-locked local cross-polarization free space coherent light communication device Download PDFInfo
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- CN105162522B CN105162522B CN201510400399.7A CN201510400399A CN105162522B CN 105162522 B CN105162522 B CN 105162522B CN 201510400399 A CN201510400399 A CN 201510400399A CN 105162522 B CN105162522 B CN 105162522B
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Abstract
A kind of phase-locked local cross-polarization free space coherent light communication device, its composition includes single-frequency single-mode laser, fibre optic polarizing beam splitter, fiber stretcher, first optical phase modulator, second optical phase modulator, data signal generator, microwave amplifier, first optical fiber collimator, second optical fiber collimator, first transmitting half-wave plate, second transmitting half-wave plate, first polarization beam splitter prism, 3rd transmitting half-wave plate, second polarization beam splitter prism, first right-angle prism, first condenser lens, second condenser lens, first balanced detector, loop filter, receive half-wave plate, 3rd polarization beam splitter prism, second right-angle prism, tertiary focusing lens, 4th condenser lens, second balanced detector and A/D converters.The coaxial orthogonal polarization signals light of present invention transmitting and the structure received in receiving terminal self-interference, can effectively overcome phase error；Lock phase structure and be located at transmitting terminal, simplify the structure of receiving terminal；The traffic rate of system can be adjusted flexibly by not carrying out any adjustment to light path.
Description
Technical field
The present invention relates to free space coherent light communication, particularly a kind of phase-locked local cross-polarization free space coherent light
Communicator.
Background technology
In satellite-ground laser communication, bigger data volume needs higher traffic rate, relative to intensity modulated direct detection
Optical communication mode, coherent light communication mechanism due to its higher theoretical limit sensitivity, higher spectrum efficiency and more preferably
The characteristic such as anti-background noise interference obtained the extensive concern of researcher.Atmospheric interference particularly atmospheric turbulance causes air
Change is influence star ground one of principal element of coherent laser communication at random for the space-time of refractive index.With using local oscillator laser and connecing
The flashlights of receipts carries out homodyne or the coherent detection mode of heterodyne is compared, autodyne interference receive detection mode without to flashlight and
The phase difference of local oscillator light enters line-locked complicated Optical phase-locked loop system or electric phase-locked loop systems, and can be efficiently against big
The phase interference of gas turbulent flow, is mutually matched before making interference optical field space wave, increases detection efficient.
Prior art [1] is (referring to Xiaoping Ma, Jianfeng Sun, Yanan Zhi, et
al..Technological research of differential phase shift keying receiver in the
satellite-to-ground laser communication[C].SPIE,2012,8517:And prior art 851714)
[2] (referring to Shanghai Optics and Precision Mechanics institute, Chinese Academy of Sciences from phase differential interference optical signal reception device：China,
CN102594456B [P] .2014.10.15.) described in 1 (1-bit) based on Mach-Zender interferometer (MZI) it is poor
Phase shift keying (hereinafter referred to as DPSK) reception system is used for the atmospheric turbulance interference of with overcoming star coherent laser communication, and this is
A kind of autodyne interference receives detection mode, but the 4-f systems that the structure must introduce two groups of different focals carry out pupil matching simultaneously
And two the optical path difference of branch road needed to be adjusted by mechanical organ driving according to different traffic rate, and this structure must received
End introduces the PGC demodulation that monitoring light carries out MZI, adds the complexity of system and realizes difficulty.
The content of the invention
The present invention provides a kind of phase-locked local cross-polarization free space coherent light communication device, with reference to star ground coherent laser
Autodyne interference receives the phase interference that can overcome atmospheric turbulance and Optical phase-locked loop that need not be complicated or electric phaselocked loop etc. in communication
Advantage, the shortcoming for being difficult regulation traffic rate and palpus introducing pupil matching system for DPSK receptions structure devises one kind locally
Phase cross-polarization is locked, the device launches the phase error between cross-polarization light path in transmitting terminal introducing phase-locked local system balance,
It is coaxial beam transmitting that transmitting crossed polarized light, which carries out phase-modulation by forward and reverse microwave data signal respectively and closes beam,
The flashlight polarization interference autodyne reception of receiving terminal reception is simultaneously detected by balanced detector, finally recovers the data letter of transmitting
Number.
The present invention solves the technical problem of the deficiencies in the prior art are overcome, launch cross-polarization coaxial beam and
Receiving terminal is interfered using autodyne to be received, the phase error that atmospheric interference and Doppler frequency shift can be overcome to introduce, without complexity
Optical phase-locked loop or electric phase-locked loop systems；Phase-locked local system is introduced in transmitting terminal, the structure of receiving terminal is simplified；Using mutually opposite
To data-signal driving voltage drive the first optical phase modulator and the second optical phase modulator respectively, reduce and be loaded into list
Voltage range on individual phase-modulator；Change data signal generation speed is on the premise of any adjustment is not carried out to light path
The traffic rate of system can be changed, flexibility is high.
The technical solution of the present invention is as follows：
A kind of phase-locked local cross-polarization free space coherent light communication device, is made up of transmitting terminal and receiving terminal, and it is special
Point is：
Described transmitting terminal includes single-frequency single-mode laser, fibre optic polarizing beam splitter, fiber stretcher, the first light phase and adjusted
Device processed, the second optical phase modulator, data signal generator, microwave amplifier, the first optical fiber collimator, the second fiber optic collimator
Device, the first transmitting half-wave plate, the second transmitting half-wave plate, the first polarization beam splitter prism, the 3rd transmitting half-wave plate, the second polarization beam splitting
Prism, the first right-angle prism, the first condenser lens, the second condenser lens, the first balanced detector and loop filter, it is described
The laser of single-frequency single-mode laser output is divided into the first optical fiber branch road and the of cross-polarization through described fibre optic polarizing beam splitter
Two optical fiber branch roads, the first optical fiber branch road is connected with the light input end of the first described optical phase modulator, the second optical fiber branch road with
The light input end connection of described fiber stretcher, the light of the light output end of the fiber stretcher and the second optical phase modulator is defeated
Enter end connection, the first described optical phase modulator and the parameter of the second optical phase modulator are identical, described data-signal hair
The output end of raw device and the input of microwave amplifier are connected, the first output end and the second output end of described microwave amplifier
The microwave input port with the first optical phase modulator and the second optical phase modulator is connected respectively, the first described light phase modulation
The light output end of device is connected with the light input end of the second described optical fiber collimator, the light output end of the second optical phase modulator with
The light input end of the first described optical fiber collimator is connected, and the output beam of the first optical fiber collimator passes through the first transmitting half-wave plate
Output to the first polarization beam splitter prism, the output beam of the second optical fiber collimator is exported to the first polarization through the second transmitting half-wave plate
Inputs light beam beam splitting is two light paths by beam splitter prism, described the first polarization beam splitter prism, and a light path is launched to receiving terminal, another
Light path is divided into transmitted light beam and the reflected beams, described transmitted light beam warp through the 3rd transmitting half-wave plate, the second polarization beam splitter prism
First condenser lens is focused on a test surface of the first balanced detector, and described the reflected beams are anti-through the first right-angle prism
Penetrate, the second condenser lens is focused on another test surface of the first balanced detector, described the first balanced detector it is defeated
Go out to terminate the input of loop filter, the second input of the fiber stretcher described in the output termination of the loop filter；
It is saturating that described receiving terminal includes reception half-wave plate, the 3rd polarization beam splitter prism, the second right-angle prism, tertiary focusing
Mirror, the 4th condenser lens, the second balanced detector and A/D converters；
The coaxial received half-wave plate of cross-polarization optical signal of described transmitting terminal transmitting rotates its polarization state and by the
Three polarization beam splitter prisms are divided into two-way light beam, wherein light beam focuses to the second balanced detector by the 4th condenser lens all the way
One test surface, another road light beam reflects by the second right-angle prism and passes through tertiary focusing lens focus to the second balance detection
On another test surface of device, the output end of the second balanced detector connects the input of A/D converters, the second balanced detector
Output signal recover original transmitting data by described A/D converters conversion.
The output end of described data signal generator and the input of microwave amplifier are connected, and data signal generator is defeated
The square wave microwave data signal gone out is enlarged into the level value of forward direction 0 to V by microwave amplifierπ/2Between the square wave that changes drive
Dynamic signal and level value reverse therewith arrive-V 0π/2Between the square wave driving signal that changes, wherein Vπ/2Representative makes by first
Driving voltage needed for the change in optical signal pi/2 phase of optical phase modulator or the second optical phase modulator.Microwave amplifier
First output end and the second output end connect with the microwave input port of the first optical phase modulator and the second optical phase modulator respectively
Connect, described positive square wave driving signal and reverse square wave driving signal respectively by microwave amplifier the first output end and
Second output end is exported and is loaded into the first optical phase modulator and the second optical phase modulator, to being adjusted by the first light phase
The optical signal of device processed and the second optical phase modulator carries out phase-modulation.The light output end of the first described optical phase modulator
Described the first optical fiber collimator and the second fiber optic collimator is connected respectively with the light output end of the second described optical phase modulator
The light input end of device, the output beam of the first optical fiber collimator is launched half-wave plate rotatory polarization state by first and exported to first
Polarization beam splitter prism, the output beam of the second optical fiber collimator is launched half-wave plate rotatory polarization state by second and exported to first
Inputs light beam beam splitting is two light paths by polarization beam splitter prism, described the first polarization beam splitter prism, and two light paths are by coaxial orthogonal
The optical signal of polarization is constituted, and one of light path is launched to receiving terminal, and another light path is led to by the 3rd described transmitting half-wave plate
The light beam of the 3rd transmitting half-wave plate is crossed through the second polarization beam splitter prism light splitting, wherein focusing to the by the first condenser lens all the way
On one test surface of one balanced detector, another light path is reflected by the first right-angle prism, then passes through the second condenser lens
Focus on another test surface of the first balanced detector, the output end linkloop of the first described balanced detector is filtered
The input of device, the input of loop filter connects the microwave input port of fiber stretcher, the first described balanced detector
Output signal filtered through loop filter, the output signal of loop filter driving fiber stretcher carries out phase compensation；
The present invention has following features：
1st, the first optical phase modulator and the second light phase is driven to adjust respectively using mutual reversely microwave signal driving voltage
Device processed, reduces the voltage range being loaded on single phase modulator.
2nd, in the phase-locked local system of transmitting terminal partly to launch optical signal as input, the driving of output error thermal compensation signal
Phase compensator, for compensating the phase error between transmitting crossed polarized light.
3rd, the present invention, using simple polarization autodyne interference receiving balance detection, is the general autodyne of FSO
Interfere reception mode.
The technique effect of the present invention：
1st, phase-locked local cross-polarization free space coherent light communication device of the present invention is a kind of cross-polarization coaxial transmitting,
Autodyne polarization interference receive phase-locked local cross-polarization free space coherent light communication device, applied to star coherent laser lead to
Letter can effectively overcome the phase interference of atmospheric turbulance, without complicated Optical phase-locked loop and electric phase-locked loop systems.
2nd, compared with prior art, receiving terminal of the present invention is simple in construction, on the premise of any adjustment is not carried out to light path,
Change data signal produces speed, you can change the traffic rate of system, and flexibility is high.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention.
Fig. 2 is the first transmitting transmitting transmitting of half-wave plate the 11, the 3rd of half-wave plate 10, second half-wave plate 13, reception half-wave in Fig. 1
The fast axle c of piece 20 and the optimal polarization of transmitting light beam orthogonal polarization orientation arrange schematic diagram.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples, but the guarantor of the present invention should not be limited with this
Protect scope.
Fig. 1 is the structural representation of phase-locked local cross-polarization free space coherent light communication device of the present invention.Can by figure
See that phase-locked local cross-polarization free space coherent light communication device of the present invention is made up of transmitting terminal and receiving terminal,
Described transmitting terminal includes single-frequency single-mode laser 1, fibre optic polarizing beam splitter 2, fiber stretcher 3, the first light phase
Position modulator 4, the second optical phase modulator 5, data signal generator 6, microwave amplifier 7, the first optical fiber collimator 8, second
The transmitting transmitting of half-wave plate 10, second of optical fiber collimator 9, first half-wave plate 11, the first polarization beam splitter prism the 12, the 3rd transmitting half-wave
Piece 13, the second polarization beam splitter prism 14, the first right-angle prism 15, the first condenser lens 16, the second condenser lens 17, first balance
Detector 18 and loop filter 19, the laser that described single-frequency single-mode laser 1 is exported is through described fibre optic polarizing beam splitter 2
It is divided into the first optical fiber branch road and the second optical fiber branch road of cross-polarization, the first optical fiber branch road and the first described optical phase modulator
4 light input end connection, the second optical fiber branch road is connected with the light input end of described fiber stretcher 3, the fiber stretcher 3
Light output end is connected with the light input end of the second optical phase modulator 5, the first described optical phase modulator 4 and the second light phase
The parameter of modulator 5 is identical, and the output end of described data signal generator 6 is connected with the input of microwave amplifier 7, described
Microwave amplifier 7 the first output end and the second output end respectively with the first optical phase modulator 4 and the second light phase modulation
The microwave input port connection of device 5, the light output end of described the first optical phase modulator 4 and the second described optical fiber collimator 9
Light input end be connected, the light input end phase of the light output end of the second optical phase modulator 5 and the first described optical fiber collimator 8
Even, the output beam of the first optical fiber collimator 8 is exported to the first polarization beam splitter prism 12, second by the first transmitting half-wave plate 10
The output beam of optical fiber collimator 9 is exported to the first polarization beam splitter prism 12 through the second transmitting half-wave plate 11, and described first is inclined
Inputs light beam beam splitting is two light paths by the beam splitter prism 12 that shakes, and a light path is launched to receiving terminal, and another light path is through the 3rd transmitting half-wave
Piece 13,14 points of the second polarization beam splitter prism are transmitted light beam and the reflected beams, and described transmitted light beam is through the first condenser lens 16
Focus on a test surface of the first balanced detector 18, described the reflected beams reflect through the first right-angle prism 15, second
Condenser lens 17 is focused on another test surface of the first balanced detector 18, the output of described the first balanced detector 18
Terminate the input of loop filter 19, the second input of the fiber stretcher 3 described in the output termination of the loop filter 19
End；
Described receiving terminal includes receiving half-wave plate 20, the 3rd polarization beam splitter prism 21, the second right-angle prism 22, trimerization
Focus lens 23, the 4th condenser lens 24, the second balanced detector 25 and A/D converters 26；
The received half-wave plate 20 of coaxial cross-polarization optical signal of described transmitting terminal transmitting rotates its polarization state and passed through
3rd 21 points of polarization beam splitter prism is two-way light beam, wherein light beam focuses to the spy of the second balance by the 4th condenser lens 24 all the way
A test surface of device 25 is surveyed, another road light beam reflects and focused to by tertiary focusing lens 23 by the second right-angle prism 22
On another test surface of second balanced detector 25, the output end of the second balanced detector 25 connects the defeated of A/D converters 26
Enter end, the output signal of the second balanced detector 25 recovers original transmitting data by the described conversion of A/D converters 26.
The single-frequency single-mode field that single-frequency single-mode laser 1 is exported is expressed as：
Wherein, A represents optical field amplitude, ω0Represent frequency of light wave,Represent the random phase of light field.Laser output light field
By fibre optic polarizing beam splitter, 2 points are that polarization direction is orthogonal, and the equal two ways of optical signals of light intensity is expressed as：
Wherein light beam is connected with the light input end of fiber stretcher 3 all the way, introduces compensation phaseHere polarized with V
Exemplified by light beam：
Microwave signal generator 6 produces level value and arrives V 0pBetween the data-signal that changes, here with pseudorandom binary sequence
Arrange exemplified by (PRBS), signal is enlarged into level value 0 to V by microwave amplifier 7π/2Between the square wave PRBS code signals that change, table
M (t) is shown as, and level value reverse therewith arrives-V 0π/2Between the square wave PRBS code signals that change, be expressed as-M (t), its
Middle Vπ/2Represent to make the voltage of the light field phase place change pi/2 by optical phase modulator.This two paths of data signal is separately input into
The microwave input port of one optical phase modulator 4 and the second optical phase modulator 5, two cross-polarization light paths respectively with the first light phase
The light input end connection of the optical phase modulator 5 of modulator 4 and second, and is phase-modulated respectively, the first light position modulator 4 and the
Light input end of the light output end of two light position modulator 5 respectively with the first optical fiber collimator 8 and the second optical fiber collimator 9 is connected,
It is expressed as by the light field for collimating outgoing：
Wherein, circ represents circle function, and R represents spot radius, optical power detection of the plane wave in the range of hot spot,
VπRepresent to make the voltage of the light field phase place change π by optical phase modulator,Represent the phase between two orthogonal polarized light fields
Position error.Two light beams launch half-wave plate 11 by the first transmitting half-wave plate 10 and second respectively, and its polarization direction is arranged referring to attached
Fig. 2, wherein c10 and c11 represent the quick shaft direction of the first transmitting half-wave plate 10 and the second transmitting half-wave plate 11 respectively, and coordinate system is sat
The direction of parameter x, y, z is as shown in Fig. 2 22.5 ° of angles in Fig. 2 are the polarization arrangement direction for making system be optimal effect.
The light field for launching half-wave plate 11 by the first transmitting half-wave plate 10 and second is expressed as：
Wherein,E'HT(x, y, t) and E'VT(x, y, t) by the beam splitting of the first polarization beam splitter prism 12, its
In it is a branch of transmitting to the 3rd transmitting half-wave plate 13, be expressed as by launching the light field before half-wave plate 13：
It is expressed as by the light field for launching half-wave plate 13：
The spectral interference of second polarization beam splitter prism 14 is passed through by the light field for launching half-wave plate 13, wherein light beam passes through all the way
First condenser lens 16 is focused on one of test surface of the first balanced detector 18, and another road light beam is through the first right-angled edge
Mirror reflects and focused to by the second condenser lens 17 on another test surface of the first balanced detector 18, the first balance detection
The optical signal received is converted into current signal by device 18, is expressed as：
Wherein,
To ensure that system is optimal effect, polarization direction α, θ should be set to α=θ or α+θ=π.Final output telecommunications
Number it is expressed as：
Wherein, D represents the photosensitive area of the first balanced detector 18, and R represents the responsiveness of the first balanced detector 18.For
Phase error signal is set to transmit to phase error signal reponse system, the present embodiment, which is used, is similar to counter lock in coherent light communication
The principle of the remaining carrier wave of phase ring transmission, makes modulated signal 2M (t) high level be slightly less than the half-wave voltage V of modulatorπ, table here
It is shown as 2Ml(t).To represent convenient, i (t) first phase is rewritten asSection 2 is rewritten asWherein, d (t) ∈ {+1, -1 }, ψ is to be slightly less thanPhase-modulation.Using similar to phaselocked loop
Linear model, filter out data item d (t) using the first balanced detector 18 and loop filter 19, then the first balanced detector
18 output current is expressed as：
Work as phase errorWhen, output current can be expressed as：
If the input impedance of loop filter 19 is Z, its transmission function is F (s), and the transmission function of fiber stretcher 3 is G
(s), the compensation phase of output isWherein s represents Laplace transform variable.The output current of first balanced detector 18
I (t) Laplace transforms are I (s), then the transmission function of whole backfeed loop synthesis is expressed as WhereinThen loop transfer function can be written as：
Transmitter, phase error can be completely eliminated in the compensation phase introduced in fiber stretcher 3In the case of, transmitting is extremely
The light field of receiving terminal is expressed as：
Its polarization state is rotated by receiving half-wave plate 20 in receiving terminal, is expressed as by the light field for receiving half-wave plate 20：
E3(x, y, t) and E4(x, y, t) is by the spectral interference of the 3rd polarization beam splitter prism 21, wherein light beam passes through all the way
Three condenser lenses 24 are focused on one of test surface of the second balanced detector 25, and another road light beam is through the second right-angle prism
22 reflect and are focused to by the 4th condenser lens 24 on another test surface of the second balanced detector 25, the second balance detection
The optical signal received is converted into current signal by device 25, is expressed as：
Wherein,
Final output
Electric signal is expressed as：
Wherein, D' represents the photosensitive area of the second balanced detector 25, and R' represents the responsiveness of the second balanced detector 25.
I'(t) sampled by A/D converters 26, recover transmitting data.
Claims (1)
1. a kind of phase-locked local cross-polarization free space coherent light communication device, is made up of, its feature transmitting terminal and receiving terminal
It is：
Described transmitting terminal includes single-frequency single-mode laser (1), fibre optic polarizing beam splitter (2), fiber stretcher (3), the first light
Phase-modulator (4), the second optical phase modulator (5), data signal generator (6), microwave amplifier (7), the first optical fiber are accurate
Straight device (8), the second optical fiber collimator (9), the first transmitting half-wave plate (10), the second transmitting half-wave plate (11), the first polarization beam splitting
Prism (12), the 3rd transmitting half-wave plate (13), the second polarization beam splitter prism (14), the first right-angle prism (15), first focus on thoroughly
Mirror (16), the second condenser lens (17), the first balanced detector (18) and loop filter (19), described single-frequency single-mode laser
The laser of device (1) output is divided into the first optical fiber branch road and the second optical fiber of cross-polarization through described fibre optic polarizing beam splitter (2)
Branch road, the first optical fiber branch road is connected with the light input end of described the first optical phase modulator (4), the second optical fiber branch road with it is described
Fiber stretcher (3) light input end connection, the light output end and the second optical phase modulator (5) of the fiber stretcher (3)
Light input end connection, described the first optical phase modulator (4) is identical with the parameter of the second optical phase modulator (5), described
The output end of data signal generator (6) be connected with the input of microwave amplifier (7), described microwave amplifier (7)
The microwave of first output end and the second output end respectively with the first optical phase modulator (4) and the second optical phase modulator (5) is defeated
Enter end connection, the described light output end of the first optical phase modulator (4) is inputted with the light of described the second optical fiber collimator (9)
End is connected, and the light output end of the second optical phase modulator (5) is connected with the light input end of described the first optical fiber collimator (8),
The output beam of first optical fiber collimator (8) is exported to the first polarization beam splitter prism (12) by the first transmitting half-wave plate (10),
The output beam of second optical fiber collimator (9) is through the second transmitting half-wave plate (11) output to the first polarization beam splitter prism (12), institute
Inputs light beam beam splitting is two light paths by the first polarization beam splitter prism (12) stated, and a light path is launched to receiving terminal, another light path warp
3rd transmitting half-wave plate (13), the second polarization beam splitter prism (14) are divided into transmitted light beam and the reflected beams, described transmitted light beam
Focused to through the first condenser lens (16) on a test surface of the first balanced detector (18), described the reflected beams are through first
Right-angle prism (15) reflection, the second condenser lens (17) are focused on another test surface of the first balanced detector (18), institute
The input of the output termination loop filter (19) for the first balanced detector (18) stated, the output of the loop filter (19)
Second input of the described fiber stretcher (3) of termination；
Described receiving terminal includes receiving half-wave plate (20), the 3rd polarization beam splitter prism (21), the second right-angle prism (22), the 3rd
Condenser lens (23), the 4th condenser lens (24), the second balanced detector (25) and A/D converters (26)；
The coaxial received half-wave plate of cross-polarization optical signal (20) of described transmitting terminal transmitting rotates its polarization state and by the
Three polarization beam splitter prisms (21) are divided into two-way light beam, wherein light beam focuses to the second balance by the 4th condenser lens (24) all the way
One test surface of detector (25), another road light beam reflects by the second right-angle prism (22) and passes through tertiary focusing lens
(23) on another test surface for focusing to the second balanced detector (25), the output end connection A/ of the second balanced detector (25)
The input of D converters (26), the output signal of the second balanced detector (25) is extensive by described A/D converters (26) conversion
The transmitting data for appearing again original.
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| CN108809420B (en) * | 2017-05-05 | 2020-11-10 | 中兴通讯股份有限公司 | Laser-based wireless frequency transmission system, and transmission device and transmission method thereof |
| 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 |
| CN110186501B (en) * | 2018-12-25 | 2021-06-15 | 中国船舶重工集团公司第七一五研究所 | Unbalanced optical fiber interferometer arm length difference measuring device and method adopting comparison method |
| CN114696917B (en) * | 2020-12-30 | 2024-04-09 | 华为技术有限公司 | Coherent optical receiver, optical communication device and system |
| CN113013726B (en) * | 2021-02-23 | 2022-03-01 | 重庆电子工程职业学院 | Broadband microwave signal generation device and method based on vertical cavity semiconductor laser |
| CN114124233B (en) * | 2021-11-15 | 2024-03-01 | 中国科学院上海光学精密机械研究所 | Spatial laser communication direct phase control optical phase locking device and method |
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| JP2011120030A (en) * | 2009-12-04 | 2011-06-16 | National Institute Of Information & Communication Technology | 90° optical hybrid |
| CN202818311U (en) * | 2011-12-08 | 2013-03-20 | 昂纳信息技术（深圳）有限公司 | Coherent optical receiver |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011120030A (en) * | 2009-12-04 | 2011-06-16 | National Institute Of Information & Communication Technology | 90° optical hybrid |
| CN202818311U (en) * | 2011-12-08 | 2013-03-20 | 昂纳信息技术（深圳）有限公司 | Coherent optical receiver |
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