CN105634591A - Free space coherent light communication detection device based on 2*4 90-degree optical bridges - Google Patents
Free space coherent light communication detection device based on 2*4 90-degree optical bridges Download PDFInfo
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- CN105634591A CN105634591A CN201610034666.8A CN201610034666A CN105634591A CN 105634591 A CN105634591 A CN 105634591A CN 201610034666 A CN201610034666 A CN 201610034666A CN 105634591 A CN105634591 A CN 105634591A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
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Abstract
The invention provides a free space coherent light communication detection device based on 2*4 90-degree optical bridges. The free space coherent light communication detection device comprises a tunable local oscillator laser light source, a modulator, a pressure control oscillator, a signal light source, an optical filter, the 2*4 90-degree optical bridges, a first balance detector, a second balance detector, a mixer, a loop filter and a signal receiver. The free space coherent light communication detection device provided by the invention can simultaneously track the phase change of signal light through the tunable local oscillator laser light source and the pressure control oscillator, the pressure control oscillator reacts sensitively, the tuning range of the tunable local oscillator laser light source is large, and if the two components are combined, the phase change of signal light can be quickly tracked to lock the phase; and the device has a small phase error deviation and high system accuracy. When a transmitter transmits a binary phase shift keying (BPSK) signal, the receiver can quickly demodulate a baseband signal at high precision.
Description
Technical field
The present invention relates to a kind of detection device for free space coherent light communication based on 2 �� 490 �� of optical bridging devices.
Background technology
Free space coherent light communication technology is with the advantage of its high receiving sensitivity, get more and more people's extensive concerning, but there is complicated problem in its system, especially at a high speed tunable local oscillator light source is difficult on a large scale, and then we have carried out the research of the detection system based on 2 �� 490 �� of optical bridging devices. This by a large scale, the free space coherent light communication of high bandwidth has very important significance.
Prior art [1] (LeonidG.Kazovsky, BalancedPhase-LockedLoopsforOpticalHomodyneReceivers:Per formanceAnalysis, DesignConsiderations, andLaserLinewidthRequirements [J], IEEEJournalofLightwaveTechnology, 1986,4 (2): 182��195) show that the maximum admissible laser linewidth of optical homodyne receptor driven based on decision-making is �� v=3.1 �� 10-4Rb, the optimal value of loop noise bandwidth is Bopt=[4.72 �� vRkPS/q]1/2; Prior art [2] (LeonidG.Kazovsky, Decision-drivenphase-lockedloopforopticalhomodynereceive rs:Performanceanalysisandlaserlinewidthrequirements [J], IEEEJournalofLightwaveTechnology, 1985,3 (6): 1238��1247) show that the maximum admissible laser linewidth of optical homodyne receptor driven based on decision-making is �� v=5.9 �� 10-6Rb, the optimal value of loop noise bandwidth isBoth the above receptor all by feat of respective advantage, gets more and more people's extensive concerning, but has a common shortcoming, and namely tunable local oscillator light source is difficult on a large scale at a high speed. Then we have carried out the research of the detection system based on 2 �� 490 �� of optical bridging devices, this by a large scale, the free space coherent light communication of high bandwidth has very important significance.
Summary of the invention
The present invention is directed between star or application background in star ground coherent laser communication, devise a kind of free space coherent light communication based on 2 �� 490 �� of optical bridging devices and detect device. The phase place change of flashlight followed the tracks of by tunable local oscillator LASER Light Source and voltage controlled oscillator simultaneously, utilizes voltage controlled oscillator to be quick on the draw and the big advantage of tunable local oscillator LASER Light Source tuning range, it is possible to quickly follows the tracks of the change of flashlight phase place and realizes PGC demodulation. When binary phase shift keying (BPSK) signal launched by transmitter, receiver quickly high-precision can realize modulation demodulation.
The technical solution of the present invention is as follows:
A kind of free space coherent light communication based on 2 �� 490 �� of optical bridging devices detects device, is characterised by that it is constituted and includes tunable local oscillator LASER Light Source, manipulator, voltage controlled oscillator, flashlight light source, optical filter, 2 �� 490 �� of Free Space Optics bridgers, the first balanced detector, the second balanced detector, frequency mixer, loop filter and signal receiver;
The described outfan of tunable local oscillator LASER Light Source is connected with the first input end of described manipulator, the outfan of described voltage controlled oscillator is connected with the second input of described manipulator, the outfan of described manipulator is connected with the input of described optical filter, the outfan of this optical filter is connected with the first input end of described 2 �� 490 �� of Free Space Optics bridgers, the outfan of described flashlight light source is connected with the second input of described 2 �� 490 �� of Free Space Optics bridgers, first outfan of these 2 �� 490 �� of Free Space Optics bridgers and the second outfan are connected with the first input end of the first described balanced detector and the second input respectively, the outfan of the first described balanced detector is connected with the first input end of described frequency mixer and the input of signal receiver respectively, 3rd outfan of 2 �� 490 �� of Free Space Optics bridgers and the 4th outfan are connected with the first input end of the second described balanced detector and the second input respectively, the outfan of the second described balanced detector is connected with the second input of described frequency mixer, the outfan of described frequency mixer is connected with the input of described loop filter, the outfan of described loop filter is connected with the described input of tunable local oscillator LASER Light Source and the input of described voltage controlled oscillator respectively,
The signal that the local oscillator light that described tunable local oscillator LASER Light Source produces and voltage controlled oscillator produce passes through bandpass optical filtering device after being modulated by manipulator, the flashlight that its result produces with flashlight light source is mixed by 2 �� 490 �� of Free Space Optics bridgers, draw the I road signal of telecommunication with the first balanced detector detection, and be received by signal receiver. Meanwhile, the I road part signal of telecommunication is mixed by frequency mixer with the Q road signal obtained with the second balanced detector detection, its result feeds back to tunable local oscillator LASER Light Source and voltage controlled oscillator through loop filter, control the frequency of local oscillator light and voltage controlled oscillator output signal, it is achieved PGC demodulation;
2 �� 490 �� of described Free Space Optics bridgers are made up of the first lens, the first quarter-wave plate, the second lens, the first polarization beam apparatus, the 3rd lens, the second quarter-wave plate, the second polarization beam apparatus, the 3rd quarter-wave plate, the 4th lens, the 4th quarter-wave plate, the 3rd polarization beam apparatus, the 5th lens and the 6th lens;
The first described balanced detector is made up of the first detector, the second detector and the first difference channel;
The second described balanced detector is made up of the 3rd detector, the 4th detector and the second difference channel;
The line polarized light of described optical filter output becomes the first circularly polarized light by the first quarter-wave plate after the first lens, first circularly polarized light becomes the first perpendicular linear polarization light and the first horizontal linear polarization light after the first polarization beam apparatus, the line polarized light of described flashlight light source output becomes the second circularly polarized light by the 3rd quarter-wave plate after the 4th lens, second circularly polarized light becomes the second perpendicular linear polarization light and the second horizontal linear polarization light after the first polarization beam apparatus, wherein, first perpendicular linear polarization light and the second horizontal linear polarization light become the 3rd circularly polarized light after the second quarter-wave plate, 3rd circularly polarized light becomes the 3rd perpendicular linear polarization light and the 3rd horizontal linear polarization light after the second polarization beam apparatus, 3rd horizontal linear polarization light is detected by the first detector after the second lens, 3rd perpendicular linear polarization light is detected by the second detector after the 3rd lens, the two path signal that first detector and the detection of the second detector obtain obtains the difference of two path signal after the first difference channel, second perpendicular linear polarization light and the first horizontal linear polarization light become the 4th circularly polarized light after the 4th quarter-wave plate, 4th circularly polarized light becomes the 4th perpendicular linear polarization light and the 4th horizontal linear polarization light after the 3rd polarization beam apparatus, 4th horizontal linear polarization light is detected by the 3rd detector after the 5th lens, 4th perpendicular linear polarization light is detected by the 4th detector after the 6th lens, the two path signal that 3rd detector and the detection of the 4th detector obtain obtains the difference of two path signal after the second difference channel.
Compared with prior art, the invention has the beneficial effects as follows:
1, tunable local oscillator LASER Light Source and voltage controlled oscillator are followed the tracks of the phase place change of flashlight by the present invention simultaneously, voltage controlled oscillator is utilized to be quick on the draw and the big advantage of tunable local oscillator LASER Light Source tuning range, it is possible to quickly to follow the tracks of the change of flashlight phase place and realize PGC demodulation.
2, phase error deviation of the present invention is little, and system accuracies is high.
3, when binary phase shift keying (BPSK) signal launched by transmitter, receiver quickly high-precision can realize modulation demodulation.
Accompanying drawing explanation
Fig. 1 is principle of the invention schematic diagram.
Fig. 2 is the structure chart of one embodiment of the invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail, but should not limit the scope of the invention with this.
Fig. 1 is principle of the invention schematic diagram. As seen from the figure, the present invention structure include tunable local oscillator LASER Light Source 1, manipulator 2, voltage controlled oscillator 3, flashlight light source 4,5,2 �� 490 �� of Free Space Optics bridger the 6, first balanced detector 7, second balanced detector 8 of optical filter, frequency mixer 9, loop filter 10 and signal receiver 11;
Fig. 2 is the structure chart of one embodiment of the invention. as seen from the figure, the structure of the present invention includes tunable local oscillator LASER Light Source 1, manipulator 2, voltage controlled oscillator 3, optical filter 4, flashlight light source 5, first lens 12, first quarter-wave plate 13, second lens 14, first polarization beam apparatus 15, 3rd lens 16, second quarter-wave plate 17, second polarization beam apparatus 18, 3rd quarter-wave plate 19, 4th lens 20, 4th quarter-wave plate 21, 3rd polarization beam apparatus 22, 5th lens 23, 6th lens 24, first detector 25, second detector 26, first difference channel 27, 3rd detector 28, 4th detector 29, second difference channel 30, frequency mixer 9, loop filter 10 and signal receiver 11,
The outfan of described tunable local oscillator LASER Light Source 1 is connected with the first input end of described manipulator 2, the outfan of described voltage controlled oscillator 3 is connected with the second input of described manipulator 2, the outfan of described manipulator 2 is connected with the input of described optical filter 5, the outfan of this optical filter 5 is connected with the first input end of described 2 �� 490 �� of Free Space Optics bridgers 6, the outfan of described flashlight light source 4 is connected with the second input of described 2 �� 490 �� of Free Space Optics bridgers 6, first outfan of these 2 �� 490 �� of Free Space Optics bridgers 6 and the second outfan are connected with the first input end of the first described balanced detector 7 and the second input respectively, the outfan of the first described balanced detector 7 is connected with the first input end of described frequency mixer 9 and the input of signal receiver 11 respectively, 3rd outfan of 2 �� 490 �� of Free Space Optics bridgers 6 and the 4th outfan are connected with the first input end of the second described balanced detector 8 and the second input respectively, and the outfan of the second described balanced detector 8 is connected with the second input of described frequency mixer 9, the outfan of described frequency mixer 9 is connected with the input of described loop filter 10, the outfan of described loop filter 10 is connected with the input of described tunable local oscillator LASER Light Source 1 and the input of described voltage controlled oscillator 3 respectively,
The signal that the local oscillator light that described tunable local oscillator LASER Light Source 1 produces and voltage controlled oscillator 3 produce passes through bandpass optical filtering device 5 after being modulated by manipulator 2, the flashlight that its result produces with flashlight light source 4 is mixed by 2 �� 490 �� of Free Space Optics bridgers 6, draw the I road signal of telecommunication with the first balanced detector 7 detection, and be received by signal receiver 11. Meanwhile, the I road part signal of telecommunication is mixed by frequency mixer 9 with the Q road signal obtained with the second balanced detector 8 detection, its result feeds back to tunable local oscillator LASER Light Source and voltage controlled oscillator through loop filter 10, control the frequency of local oscillator light and voltage controlled oscillator output signal, it is achieved PGC demodulation.
The phase place change of flashlight followed the tracks of by described tunable local oscillator LASER Light Source 1 and described voltage controlled oscillator 3 simultaneously, it is achieved phase place quick lock in;
The first described balanced detector is made up of first detector the 25, second detector 26 and the first difference channel 27;
The second described balanced detector is made up of first detector the 28, second detector 29 and the first difference channel 30;
2 �� 490 �� of described Free Space Optics bridgers are made up of first lens the 12, first quarter-wave plate the 13, second lens the 14, first polarization beam apparatus the 15, the 3rd lens the 16, second quarter-wave plate the 17, second polarization beam apparatus the 18, the 3rd quarter-wave plate the 19, the 4th lens the 20, the 4th quarter-wave plate the 21, the 3rd polarization beam apparatus the 22, the 5th lens 23 and the 6th lens 24;
The line polarized light of described optical filter 5 output becomes the first circularly polarized light by the first quarter-wave plate 13 after the first lens 12, first circularly polarized light becomes the first perpendicular linear polarization light and the first horizontal linear polarization light after the first polarization beam apparatus 18, the line polarized light of described flashlight light source 4 output becomes the second circularly polarized light by the 3rd quarter-wave plate 19 after the 4th lens 20, second circularly polarized light becomes the second perpendicular linear polarization light and the second horizontal linear polarization light after the first polarization beam apparatus 18, wherein, first perpendicular linear polarization light and the second horizontal linear polarization light become the 3rd circularly polarized light after the second quarter-wave plate 17,3rd circularly polarized light becomes the 3rd perpendicular linear polarization light and the 3rd horizontal linear polarization light after the second polarization beam apparatus 15,3rd horizontal linear polarization light is detected by the first detector 25 after the second lens 14,3rd perpendicular linear polarization light is detected by the second detector 26 after the 3rd lens 16, the two path signal that first detector 25 and the detection of the second detector 26 obtain obtains the difference of two path signal after the first difference channel 27, second perpendicular linear polarization light and the first horizontal linear polarization light become the 4th circularly polarized light after the 4th quarter-wave plate 21,4th circularly polarized light becomes the 4th perpendicular linear polarization light and the 4th horizontal linear polarization light after the 3rd polarization beam apparatus 22,4th horizontal linear polarization light is detected by the 3rd detector 28 after the 5th lens 23,4th perpendicular linear polarization light is detected by the 4th detector 29 after the 6th lens 24, the two path signal that 3rd detector 28 and the detection of the 4th detector 29 obtain obtains the difference of two path signal after the second difference channel 30.
Signal output is analyzed:
Assume that local oscillator light is plane wave, then its output expression formula is:
Wherein,For the phase noise of local oscillator laser instrument, PLOFor the output of local oscillator light, fLOFor the output frequency of local oscillator light, define as follows:
fLO=fLO0+a��T
T is temperature, by the control of input voltage, by changing input voltage, thus it is possible to vary temperature, thus changing the output frequency of local oscillator light. FLLO0For original frequency, a is the temperature influence coefficient to frequency.
Voltage controlled oscillator is output as:
Wherein,For the phase noise of voltage controlled oscillator, fVCOFor the output frequency of voltage controlled oscillator, define as follows:
fVCO=fVCO0+k��VVCO
VVCOFor the output voltage of voltage controlled oscillator, fVCO0For original frequency, k is the influence coefficient of voltage against frequency.
Local oscillator light in manipulator is under the effect of voltage controlled oscillator, and the expression formula of the light of output is:
Wherein, m is modulation depth.
Assume that the light after modulators modulate is by a bandpass optical filtering device, it is assumed that band filter is desirable, and only retains low-frequency component, then have:
Then the expression formula of its complex amplitude can be written as:
Wherein
Assume that flashlight is plane wave, then its output expression formula is:
Wherein, PSFor the output of local oscillator light,For the output phase place of local oscillator laser instrument, define as follows:
Wherein,For generating laser phase noise, constantIntroduce to simplify process, do not produce in real process.For phase modulation depth, define as follows:
�� is the phase deviation that phase-modulation causes.
When the transmitting signal of transmitter being modulated with BPSK (binary phase shift keying), the data being launched, or be 0, or be that 1, d (t) definition is as follows:
In order to represent the polarization state of light, the two bundle input light entering 2 �� 490 �� of Free Space Optics bridgers can adopt the mode of polarization matrix, it may be assumed that
Wherein, k1��k2��k3And k4Represent the polarization state of light respectively,
Flashlight and the light after bandpass optical filter are by being divided into four road light after the directional coupler of 90 �� of phase shifts, and the four road signals of telecommunication obtained after photodiode detects respectively (calculate for simplifying, it is assumed that quantum efficiency is 1):
Wherein, R is detector responsivity, n1��n2��n3And n4The respectively shot noise of photodiode.
By the process after Photoelectric Detection, Dui Zhe tetra-road signal subtracts each other between two, eliminates DC component, it is possible to the signal expression obtaining I branch road and Q branch road is:
OrderAfter then being amplified by transimpedance amplifier, the output voltage signal expression formula of I branch road and Q branch road is:
Wherein
N1=(n1-n2)r
N2=(n3-n4)r
Electricity frequency mixer is equivalent to a multiplier, and the voltage signal of I branch road and Q branch road output expression formula after electricity frequency mixer is:
Wherein:
A1=2rRmk | ESELO|
A2=-2rRm (1-k) | ESELO|
N=A1N2+A2N1+N1N2
Obvious:
Wherein:
Then output voltage can abbreviation be:
That is:
Wherein,For total error, it is defined as:
Wherein,For total phase noise,For total control phase place, it is respectively defined as:
For coherent receiver, total error variance value is:
Wherein, BnFor the bandwidth of ring, PsThe signal power of data transmission, k is the component of I branch road, and �� v is live width.
Then minimum error variance is:
Signal power for data transmission is:
Then have:
Work as Rb=1010Bit/s, �� v=100kHz, BER=10-10Time, then have:
��2=7.42 �� 10-1rad2
Finally, when binary phase shift keying (BPSK) signal launched by transmitter, phase error deviation can reach 7.42 �� 10-4rad2, so, the degree of accuracy of system can improve a lot, and the realization for following high-precision laser satellite communication has indispensable effect.
Claims (3)
1. detect a device based on the free space coherent light communication of 2 �� 490 �� of optical bridging devices, be characterised by that it is constituted and include tunable local oscillator LASER Light Source (1), manipulator (2), voltage controlled oscillator (3), flashlight light source (4), optical filter (5), 2 �� 490 �� of Free Space Optics bridgers (6), the first balanced detector (7), the second balanced detector (8), frequency mixer (9), loop filter (10) and signal receiver (11);
The outfan of described tunable local oscillator LASER Light Source (1) is connected with the first input end of described manipulator (2), the outfan of described voltage controlled oscillator (3) is connected with the second input of described manipulator (2), the outfan of described manipulator (2) is connected with the input of described optical filter (5), the outfan of this optical filter (5) is connected with the first input end of described 2 �� 490 �� of Free Space Optics bridgers (6), the outfan of described flashlight light source (4) is connected with the second input of described 2 �� 490 �� of Free Space Optics bridgers (6), first outfan of these 2 �� 490 �� of Free Space Optics bridgers (6) and the second outfan are connected with the first input end of described the first balanced detector (7) and the second input respectively, the outfan of described the first balanced detector (7) is connected with the first input end of described frequency mixer (9) and the input of signal receiver (11) respectively, 3rd outfan and the 4th outfan of 2 �� 490 �� of Free Space Optics bridgers (6) are connected with the first input end of described the second balanced detector (8) and the second input respectively, and the outfan of described the second balanced detector (8) is connected with the second input of described frequency mixer (9), the outfan of described frequency mixer (9) is connected with the input of described loop filter (10), the outfan of described loop filter (10) is connected with the input of described tunable local oscillator LASER Light Source (1) and the input of described voltage controlled oscillator (3) respectively,
The signal that the local oscillator light that described tunable local oscillator LASER Light Source (1) produces and voltage controlled oscillator (3) produce passes through bandpass optical filtering device (5) after being modulated by manipulator (2), the flashlight that its result produces with flashlight light source (4) is mixed by 2 �� 490 �� of Free Space Optics bridgers (6), draw the I road signal of telecommunication with the first balanced detector (7) detection, and be received by signal receiver (11). Meanwhile, the I road part signal of telecommunication is mixed by frequency mixer (9) with the Q road signal obtained with the second balanced detector (8) detection, its result feeds back to tunable local oscillator LASER Light Source and voltage controlled oscillator through loop filter (10), control the frequency of local oscillator light and voltage controlled oscillator output signal, it is achieved PGC demodulation.
2. the free space coherent light communication based on 2 �� 490 �� of optical bridging devices according to claim 1 detects device, it is characterized in that the phase place change of flashlight followed the tracks of by tunable local oscillator LASER Light Source (1) and voltage controlled oscillator (3) simultaneously, it is achieved phase place quick lock in.
3. the free space coherent light communication based on 2 �� 490 �� of optical bridging devices according to claim 1 detects device, it is characterized in that described 2 �� 490 �� Free Space Optics bridger is by the first lens (12), first quarter-wave plate (13), second lens (14), first polarization beam apparatus (15), 3rd lens (16), second quarter-wave plate (17), second polarization beam apparatus (18), 3rd quarter-wave plate (19), 4th lens (20), 4th quarter-wave plate (21), 3rd polarization beam apparatus (22), 5th lens (23) and the 6th lens (24) composition,
The first described balanced detector is made up of the first detector (25), the second detector (26) and the first difference channel (27);
The second described balanced detector is made up of the 3rd detector (28), the 4th detector (29) and the second difference channel (30);
The line polarized light that described optical filter (5) exports becomes the first circularly polarized light by the first quarter-wave plate (13) after the first lens (12), first circularly polarized light becomes the first perpendicular linear polarization light and the first horizontal linear polarization light after the first polarization beam apparatus (18), the line polarized light that described flashlight light source (4) exports becomes the second circularly polarized light by the 3rd quarter-wave plate (19) after the 4th lens (20), second circularly polarized light becomes the second perpendicular linear polarization light and the second horizontal linear polarization light after the first polarization beam apparatus (18), wherein, first perpendicular linear polarization light and the second horizontal linear polarization light become the 3rd circularly polarized light after the second quarter-wave plate (17), 3rd circularly polarized light becomes the 3rd perpendicular linear polarization light and the 3rd horizontal linear polarization light after the second polarization beam apparatus (15), 3rd horizontal linear polarization light is detected by the first detector (25) after the second lens (14), 3rd perpendicular linear polarization light is detected by the second detector (26) after the 3rd lens (16), the two path signal that first detector (25) and the second detector (26) detection obtain obtains the difference of two path signal after the first difference channel (27), second perpendicular linear polarization light and the first horizontal linear polarization light become the 4th circularly polarized light after the 4th quarter-wave plate (21), 4th circularly polarized light becomes the 4th perpendicular linear polarization light and the 4th horizontal linear polarization light after the 3rd polarization beam apparatus (22), 4th horizontal linear polarization light is detected by the 3rd detector (28) after the 5th lens (23), 4th perpendicular linear polarization light is detected by the 4th detector (29) after the 6th lens (24), the two path signal that 3rd detector (28) and the detection of the 4th detector (29) obtain obtains the difference of two path signal after the second difference channel (30).
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