CN102638301B - The modulation and demodulation apparatus and method of light signal in a kind of space optical communication - Google Patents
The modulation and demodulation apparatus and method of light signal in a kind of space optical communication Download PDFInfo
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Abstract
The modulation and demodulation device of light signal in a kind of space optical communication, comprise transmitter and receiver, transmitter comprises the light source, intensity modulator and the optical transmitting antenna that set gradually along light path, and receiver is disposed with optical receiver antenna, single-photon detector, preamplifier, noise comparator, monostable flipflop and the signal transmission based on FPGA according to signal transmission direction and extracts circuit; In space optical communication, the modulation and demodulation method of light signal comprises 1] transmitter and receiver set up a synchronized links, 2] launch information, the steps such as demodulating information.The present invention is directed to the requirement of current spatial optical communication to low-power consumption, ultra-distance communication, a kind of modulation and demodulation apparatus and method based on light signal in the space optical communication of single photon detection are proposed, there is very high flashlight receiving sensitivity, the error rate is low, structure is simple, lightweight, the advantage such as low in energy consumption.
Description
Technical field
The present invention relates to space communications technique field, the particularly modulation of light signal in space optical communication, detection, solution are in harmonious proportion synchronous.
Background technology
Space optical communication is the focus that various countries are competitively studied, and low-power consumption, ultra-distance communication are one of space optical communication key technical problems that will solve.In space optical communication, the modulation and demodulation of light signal mainly contain two kinds at present.One is direct intensity modulation/direct detection system, and another kind is associated modulation/Heterodyne Detection System.
In direct intensity modulation/direct detection system, the information of transmitting terminal by carrying out directly modulation to send transmitting to the intensity of light carrier, as OOK (break-make modulation), PPM (pulse position modulation) etc.At receiving terminal, light signal to detector, after detector receives incident light, is directly changed into current signal by focus incoming light by optical lens antenna, and the current signal exported by demodulation detector obtains transmitted information.According to opto-electronic conversion law, the electric current that detector exports is directly proportional to luminous power, and therefore direct-detection is again power detection and the noncoherent detection of light.Direct intensity modulation/direct-detection system, has structure simple, easily the advantage such as realization, but shortcoming to be receiving sensitivity low.
In associated modulation/Heterodyne Detection System, transmitting terminal is by modulating the information sending and will transmit, as PSK (phase-shift keying) to the shift frequency of optical carrier and phase shift.Receiving terminal optical lens antenna is concerned with a local oscillator light after receiving incident flashlight.Detector is equivalent to frequency mixer, and it is the difference frequency component of flashlight and local oscillator light accordingly, and what detector exported is intermediate frequency photoelectric current.The current signal that detector exports, after intermediate frequency amplification filtering, realizes demodulating information by frequency discrimination and phase demodulation.Associated modulation/Heterodyne Detection System, has the advantage that receiving sensitivity is high, but adds local oscillator light at receiving terminal, and it is relatively stricter to require local oscillator light and flashlight to require in spatial coherence, and therefore system configuration is complicated, and power consumption is large.
Single-photon detecting survey technology is a kind of Detection Techniques with single photon detection sensitivity, has very high sensitivity.It is passable that single-photon detecting survey technology is used for optical communication, reduces power consumption, realize ultra-distance communication.Patent (application number: 201110166120.5) propose a kind of overlength distance optical communication system based on single photon detection and method, optical communication system transmitting terminal adopts Polarization Modulation, when sending signal " 0 ", electronically control laser and send horizontal polarization light pulse, when sending signal " 1 ", electronically control laser and send horizontal polarization light pulse.The receiving terminal of optical communication system adopts polarization splitting prism that the flashlight of acceptance is divided into horizontal polarization and vertical polarization, receives horizontal polarization and vertical polarization respectively, decode signal " 1 " and " 0 " with two single-photon detectors.Be not difficult to find out above-mentioned patent application Problems existing: 1) this patent application does not provide after single-photon detector receives horizontal and vertical polarized optical pulse, extracts the method for signal " 1 " and " 0 ".Only give the polarization modulation method of flashlight.2) this patent application increases the complexity of system, and need accurate electronics to control laser at transmitting terminal and produce different polarised lights, receiving terminal needs polarization spectroscope and two single-photon detectors.3) error rate of system is high, and not high and dark counting of the depolarization of channel, system polarization contrast etc. all will make the data invalid received.
Summary of the invention
The object of the invention is to, for the requirement of current spatial optical communication to low-power consumption, ultra-distance communication, propose a kind of modulation and demodulation apparatus and method based on light signal in the space optical communication of single photon detection.
Technical solution of the present invention is as follows:
In space optical communication, a modulation and demodulation device for light signal, comprises transmitter and receiver, and its special character is: described transmitter comprises the light source, intensity modulator and the optical transmitting antenna that set gradually along light path,
Described receiver is disposed with optical receiver antenna, single-photon detector, preamplifier, noise comparator, monostable flipflop and the signal transmission based on FPGA according to signal transmission direction and extracts circuit,
The described signal transmission based on FPGA extracts circuit and comprises Extraction of Bit Synchronization Signal module, first counter, logic controller, buffer, threshold register and number of photons comparator, described monostable flipflop output is connected with synchronizing signal extraction module and the first counter simultaneously, the output of described first counter is by buffer and number of photons comparator, the output of described synchronizing signal extraction module passes through logic controller, buffer is defeated to be connected with number of photons comparator, described threshold register is connected with number of photons comparator, described logic controller provides reset signal to the first counter.
Above-mentioned Extraction of Bit Synchronization Signal module comprises gate gating signal transmitter, multiple second counter, comparator and selector, described gate gating signal transmitter produces multiplexing gate gating signal, every road door gating signal controls second counter, each input of the second counter is connected with the output of monostable flipflop, the output of each second counter is connected with comparator, the output of described comparator is connected with selector, and described gate gating signal transmitter produces multiplexing gate gating signal and inputs to selector.
Above-mentioned single-photon detector is photomultiplier, microchannel plate or snowslide APD detector.
Above-mentioned preamplifier is fast current sense amplifier.
A modulation and demodulation method for light signal in space optical communication, its special character is: comprise the following steps:
1] synchronized links set up by transmitter and receiver:
1.1] light source launches coordination code optical signal through intensity modulator, optical transmitting antenna;
1.2] optical receiver antenna receives coordination code optical signal, through single-photon detector, preamplifier, noise comparator, monostable flipflop, sends to Extraction of Bit Synchronization Signal module;
1.3] bit synchronization signal is extracted:
1.3.1] the door strobe generator generation cycle is identical with the bit synchronization signal cycle, the multiplexing gate gating signal of out of phase;
1.3.2] there are multiple second counters of a gating function under the control of out of phase door gating signal, respectively the single photon pulses of input coordination code optical signal is counted; When door gating signal is high level, input single photon pulses is counted, when door gating signal is low level, input single photon pulses is not counted;
1.3.3] comparator is by the count value of more multiple second counter, the sequence number of the second maximum for count value counter is sent to the input of selector;
1.3.4] the gate gating signal that selector selects the second counter corresponding according to the second inputted counter sequence number exports as bit synchronization signal;
1.4] bit synchronization signal exports logic controller to, and synchronized links set up by transmitter and receiver;
2] information is launched, demodulating information:
2.1] light source sends optical carrier, and the intensity of intensity modulator to optical carrier is modulated and sent effective light signal of wanted transmission information, and effective light signal sends through optical transmitting antenna;
2.2] effectively light signal, after remote channel, will decay to the effective light signal of single-photon state;
2.3] effective for the single-photon state received light signal is focused on single-photon detector by the reception optical antenna of receiver end, and single-photon detector exports discrete single photon pulses signal;
2.4] anti-phase amplification is carried out to the pulse of discrete single photon pulses signal, the single photon pulses signal be amplified;
2.5] noise comparator is utilized to screen the single photon pulses signal after amplification, filtering noise pulse,
Described input signal-to-noise ratio compared with the threshold value of device higher than noise level, and the amplitude of the single photon pulses signal exported lower than detector;
2.6] utilize monostable flipflop to carry out broadening to the single photon pulses signal that noise comparator exports and export broadening single photon pulses signal;
2.7] signal transmission that broadening single photon pulses signal inputs to based on FPGA extracts circuit;
2.7.1] the first comparator counts the broadening single photon pulses signal of input based on the signal transmission extraction circuit of FPGA;
2.7.2] logic controller is after rising edge bit synchronization signal at every turn being detected, count value in first counter is deposited buffer, reset to the first counter, the counter after reset starts again to count the broadening single photon pulses signal of input simultaneously;
2.7.3] number of photons comparator compares the value in buffer and threshold register:
If buffer count value is greater than the threshold value in threshold register, be then high level signal, export transmitted information " 1 ", perform step 2.7.2 simultaneously];
If buffer count value is less than the threshold value in threshold register, be then low level signal, export transmitted information " 0 ", perform step 2.7.2 simultaneously];
Threshold value in described threshold register is greater than the mean value of dark counting in bit synchronization signal, is less than the mean value of single photon pulses in bit synchronization signal;
2.8] transmitted information is demodulated.
The advantage that the present invention has:
1, there is very high flashlight receiving sensitivity.The present invention proposes the modulation and demodulation apparatus and method of space optical communication, is based on single-photon detecting survey technology.Detector is operated in photon counting mode, carrys out restituted signal by the umber of pulse of the single photon exported detector, instead of the electric current exported by detecting detector carrys out restituted signal.There is very high detectivity.Thus lower power consumption can be utilized, realize the space optical communication of overlength distance.
2, the error rate is low.The present invention one utilizes the dark noise in threshold value Zhen method for distinguishing removal detector output pulse, and two is the methods utilizing the number of single photon pulses in the bit synchronization signal cycle to be greater than threshold value, removes the impact of dark counting on signal extraction.Therefore system noise and dark counting affect very little, so the error rate is very low on the extraction of signal.
3, structure is simple, lightweight, the advantage such as low in energy consumption, the modulation and demodulation apparatus and method of space optical communication, the modulated terminal of optical communication adopts the directly modulation of light intensity, as OOK and PPM modulation, receiving terminal only needs a single-photon detector just can realize the extraction of signal, does not need polarization spectroscope, therefore has structure simple, lightweight, the advantage such as low in energy consumption.
4, the flexibility that tool is high and integrated level high, the present invention utilizes and the FPGA of overprogram can realize extraction that is synchronous and signal, has very high flexibility and integrated level.
Accompanying drawing explanation
Fig. 1 is the structural representation of the modulation and demodulation device of the space optical communication that the present invention is based on single photon detection;
Fig. 2 is the demodulation sequential chart of the signal based on single photon detection;
Fig. 3 is the structural representation of the signal transmission extraction circuit based on FPGA;
Fig. 4 is the structural representation of Extraction of Bit Synchronization Signal module;
Fig. 5 is the sequential chart of signal extraction.
Embodiment
As shown in Figure 1, in space optical communication, the modulation and demodulation device of light signal, comprises transmitter and receiver, and transmitter comprises the light source, intensity modulator and the optical transmitting antenna that set gradually along light path,
Receiver is disposed with optical receiver antenna, single-photon detector, preamplifier, noise comparator, monostable flipflop and the signal transmission based on FPGA according to signal transmission direction and extracts circuit.
Single-photon detector is photomultiplier, microchannel plate or snowslide APD detector.Preamplifier is fast current sense amplifier.
As shown in Figure 3, signal transmission based on FPGA extracts circuit and comprises Extraction of Bit Synchronization Signal module, first counter, logic controller, buffer, threshold register and number of photons comparator, monostable flipflop output is connected with synchronizing signal extraction module and the first counter simultaneously, the output of the first counter is by buffer and number of photons comparator, the output of synchronizing signal extraction module passes through logic controller, buffer is defeated to be connected with number of photons comparator, threshold register is connected with number of photons comparator, logic controller provides reset signal to the first counter.
As shown in Figure 4, Extraction of Bit Synchronization Signal module comprises gate gating signal transmitter, multiple second counter, comparator and selector, gate gating signal transmitter produces multiplexing gate gating signal, every road door gating signal controls second counter, each input of the second counter is connected with the output of monostable flipflop, the output of each second counter is connected with comparator, the output of comparator is connected with selector, and gate gating signal transmitter produces multiplexing gate gating signal and inputs to selector.
A modulation and demodulation method for light signal in space optical communication, comprises the following steps:
1] synchronized links set up by transmitter and receiver:
1.1] light source launches coordination code optical signal through intensity modulator, optical transmitting antenna;
1.2] optical receiver antenna receives coordination code optical signal, through single-photon detector, preamplifier, noise comparator, monostable flipflop, sends to Extraction of Bit Synchronization Signal module;
1.3] bit synchronization signal is extracted:
1.3.1] the door strobe generator generation cycle is identical with the bit synchronization signal cycle, the multiplexing gate gating signal of out of phase;
1.3.2] there are multiple second counters of a gating function under the control of out of phase door gating signal, respectively the single photon pulses of input coordination code optical signal is counted; When door gating signal is high level, input single photon pulses is counted, when door gating signal is low level, input single photon pulses is not counted;
1.3.3] comparator is by the count value of more multiple second counter, the sequence number of the second maximum for count value counter is sent to the input of selector;
1.3.4] the gate gating signal that selector selects the second counter corresponding according to the second inputted counter sequence number exports as bit synchronization signal;
1.4] bit synchronization signal exports logic controller to, and synchronized links set up by transmitter and receiver;
2] information is launched, demodulating information:
2.1] light source sends optical carrier, and the intensity of intensity modulator to optical carrier is modulated and sent effective light signal of wanted transmission information, and effective light signal sends through optical transmitting antenna;
2.2] effectively light signal, after remote channel, will decay to the effective light signal of single-photon state;
2.3] effective for the single-photon state received light signal is focused on single-photon detector by the reception optical antenna of receiver end, and single-photon detector exports discrete single photon pulses signal;
2.4] anti-phase amplification is carried out to the pulse of discrete single photon pulses signal, the single photon pulses signal be amplified;
2.5] noise comparator is utilized to screen the single photon pulses signal after amplification, filtering noise pulse,
Described input signal-to-noise ratio compared with the threshold value of device higher than noise level, and the amplitude of the single photon pulses signal exported lower than detector;
2.6] utilize monostable flipflop to carry out broadening to the single photon pulses signal that noise comparator exports and export broadening single photon pulses signal; Noise pulse in the method removal detector output pulse adopting threshold value to compare and part dark pulse are to improve signal to noise ratio.
2.7] signal transmission that broadening single photon pulses signal inputs to based on FPGA extracts circuit; Monostable flipflop is adopted to convert the level of single photon pulses and carry out broadening to single photon pulses, to match with based on the signal extraction of FPGA and synchronous circuit.
2.7.1] the first comparator counts the broadening single photon pulses signal of input based on the signal transmission extraction circuit of FPGA;
2.7.2] logic controller is after rising edge bit synchronization signal at every turn being detected, count value in first counter is deposited buffer, reset to the first counter, the counter after reset starts again to count the broadening single photon pulses signal of input simultaneously;
2.7.3] number of photons comparator compares the value in buffer and threshold register:
If buffer count value is greater than the threshold value in threshold register, be then high level signal, export transmitted information " 1 ", perform step 2.7.2 simultaneously];
If buffer count value is less than the threshold value in threshold register, be then low level signal, export transmitted information " 0 ", perform step 2.7.2 simultaneously];
Threshold value in described threshold register is greater than the mean value of dark counting in bit synchronization signal, is less than the mean value of single photon pulses in bit synchronization signal;
2.8] transmitted information is demodulated.
Embodiment:
1, the method extracting bit synchronization signal is as follows:
1.1 before secured transmission of payload data, first transmits bit synchronization code, to extract bit synchronization signal.
Under the modulation of 1.2 synchronous codes in place, transmitter sends and bit synchronization signal, the periodic square wave light signal that the cycle is identical with phase place.
After 1.3 optical receivers receive the light signal for Extraction of Bit Synchronization Signal, the single photon pulses that monostable flipflop exports is input to based on the Extraction of Bit Synchronization Signal module in the signal extraction module of FPGA.
The extraction module of 1.4 synchronizing signals as shown in Figure 4, comprises gate gating signal transmitter, counter, comparator, selector.The extracting method of bit synchronization signal is:
1.4.1 the door strobe generator generation cycle is identical with the bit synchronization signal cycle, the multiplexing gate gating signal of out of phase.
1.4.2 there is the counter 1 ~ 4 of a gating function under the control of out of phase door gating signal, respectively the single photon pulses of input is counted.When door gating signal is high level, input single photon pulses is counted, when door gating signal is low level, input single photon pulses is not counted.
1.4.3 comparator is by comparing the second count value of counter 1 ~ 4, obtains the sequence number of the second maximum counter of count value, and the input of the selector that sends sequence number.
1.4.4 selector selects the gate gating signal that wherein a road is the most synchronous to export as bit synchronization signal according to inputted counter sequence number.Because if the gate gating signal produced is more synchronous with the bit synchronization signal of transmitting terminal, then the value of counter is larger.
4 gate gating signals are only drawn, 4 counters in Fig. 4.Gate gating signal sum counter is more, and the bit synchronization signal produced is more accurate.
The bit synchronization signal input logic controller extracted.After extracting bit synchronization signal, start secured transmission of payload data.
2, secured transmission of payload data is started:
2.1, transmitter terminal, intensity modulator carries out directly modulation to send the information that will transmit to the intensity of the optical carrier that light source sends, as OOK (break-make modulation).Light signal after modulation sends through optical transmitting antenna.
As shown in Figure 2,
2.2, light signal is after remote channel, very faint by what decay, in single-photon state.
2.3, the light signal received is focused on single-photon detector by the reception optical antenna of receiver end.
2.4, single-photon detector receives the atomic weak light signal of channel decay, exports discrete single photon pulses signal.Single-photon detector can adopt photomultiplier, microchannel plate, and snowslide APD detects.
2.5, the pulse amplitude of single-photon detector output is very little, therefore carries out anti-phase amplification to the discrete pulsed signal that single-photon detector exports.Preamplifier adopts fast current sense amplifier.
2.6, comparator is adopted to screen single photon pulses.Arrange threshold value higher than noise level, the amplitude of the single photon pulses that simultaneously should export lower than detector, with filtering noise pulse.Because in the pulse that detector exports, except there being the pulse representing single photon, also comprise noise pulse, and the dark counting pulse of low amplitude.
2.7, the pulse signal due to comparator output is very narrow, therefore inputs monostable flipflop by signal broadening, so that mate based on the signal transmission extraction circuit input end of FPGA.
2.8, the signal transmission extraction circuit that the signal pulse that monostable flipflop exports inputs based on FPGA carries out signal extraction.
2.9, the signal transmission based on FPGA extracts circuit as shown in Figure 3, comprises Extraction of Bit Synchronization Signal module, counter, logic controller, buffer, threshold register and comparator.
Concrete extracting method is:
The single photon pulses of counter to the FPGA of input 1, with reset function counts.
2, as shown in Figure 5, logic controller, after rising edge synchronizing signal at every turn being detected, is deposited buffer the count value in counting, is resetted simultaneously to counter.Counter after reset starts again to count the single photon pulses of input.The value of therefore depositing in buffer is the counting of single photon pulses in synchronizing signal each pulse spacing.
3, comparator compares the value in buffer and threshold register, if buffer intermediate value is greater than the preset value in threshold register, export high level signal, representative " 1 ", until next count value is stored in buffer.If buffer intermediate value is less than the preset value in threshold register, output low level signal, representative " 0 ", until next count value is stored in buffer, thus demodulates information.
4, the threshold value in threshold register should be greater than the mean value of dark counting in bit synchronization signal, is less than the mean value of single photon pulses in bit synchronization signal.Because input signal transmission extracts the signal of circuit, except the pulse representing single photon, also have a small amount of dark noise pulse that amplitude is suitable with single photon pulses, this pulse cannot be removed before signal enters extraction circuit, and occurs having randomness.So when representative information " 0 ", also one or more dark counting may be there is in bit synchronization signal.The extraction of dark noise impulse pair signals can be reduced, to reduce the error rate by the value arranging larger threshold register.
Claims (5)
1. the modulation and demodulation device of light signal in space optical communication, comprises transmitter and receiver, it is characterized in that: described transmitter comprises the light source, intensity modulator and the optical transmitting antenna that set gradually along light path,
Described receiver is disposed with optical receiver antenna, single-photon detector, preamplifier, noise comparator, monostable flipflop and the signal transmission based on FPGA according to signal transmission direction and extracts circuit,
The described signal transmission based on FPGA extracts circuit and comprises Extraction of Bit Synchronization Signal module, first counter, logic controller, buffer, threshold register and number of photons comparator, described monostable flipflop output is connected with Extraction of Bit Synchronization Signal module and the first counter simultaneously, the output of described first counter is connected with number of photons comparator by buffer, the output of described Extraction of Bit Synchronization Signal module passes through logic controller, buffer output is connected with number of photons comparator, described threshold register is connected with number of photons comparator, described logic controller provides reset signal to the first counter.
2. the modulation and demodulation device of light signal in space optical communication according to claim 1, it is characterized in that: described Extraction of Bit Synchronization Signal module comprises gate gating signal transmitter, multiple second counter, comparator and selector, described gate gating signal transmitter produces multichannel gate gating signal, every road gate gating signal controls second counter, each input of the second counter is connected with the output of monostable flipflop, the output of each second counter is connected with comparator, the output of described comparator is connected with selector, described gate gating signal transmitter produces multichannel gate gating signal and inputs to selector.
3. the modulation and demodulation device of light signal in space optical communication according to claim 1 and 2, is characterized in that: described single-photon detector is photomultiplier, microchannel plate or snowslide APD detector.
4. the modulation and demodulation device of light signal in space optical communication according to claim 3, is characterized in that: described preamplifier is fast current sense amplifier.
5. the modulation and demodulation method of light signal in space optical communication, is characterized in that: comprise the following steps:
1] synchronized links set up by transmitter and receiver:
1.1] light source launches coordination code optical signal through intensity modulator, optical transmitting antenna;
1.2] optical receiver antenna receives coordination code optical signal, through single-photon detector, preamplifier, noise comparator, monostable flipflop, sends to Extraction of Bit Synchronization Signal module;
1.3] bit synchronization signal is extracted:
1.3.1] the gate strobe generator generation cycle is identical with the bit synchronization signal cycle, the multichannel gate gating signal of out of phase;
1.3.2] there are multiple second counters of gate gating function under the control of out of phase gate gating signal, respectively the single photon pulses of input coordination code optical signal is counted; When gate gating signal is high level, input single photon pulses is counted, when gate gating signal is low level, input single photon pulses is not counted;
1.3.3] comparator is by the count value of more multiple second counter, the sequence number of the second maximum for count value counter is sent to the input of selector;
1.3.4] the gate gating signal that selector selects the second counter corresponding according to the second inputted counter sequence number exports as bit synchronization signal;
1.4] bit synchronization signal exports logic controller to, and synchronized links set up by transmitter and receiver;
2] information is launched, demodulating information:
2.1] light source sends optical carrier, and the intensity of intensity modulator to optical carrier is modulated and sent effective light signal of wanted transmission information, and effective light signal sends through optical transmitting antenna;
2.2] effectively light signal, after remote channel, will decay to the effective light signal of single-photon state;
2.3] effective for the single-photon state received light signal is focused on single-photon detector by the optical receiver antenna of receiver end, and single-photon detector exports discrete single photon pulses signal;
2.4] anti-phase amplification is carried out to the pulse of discrete single photon pulses signal, the single photon pulses signal be amplified;
2.5] noise comparator is utilized to screen the single photon pulses signal after amplification, filtering noise pulse,
Input the threshold value of described noise comparator higher than noise level, and lower than the amplitude of single photon pulses signal that single-photon detector exports;
2.6] utilize monostable flipflop to carry out broadening to the single photon pulses signal that noise comparator exports and export broadening single photon pulses signal;
2.7] signal transmission that broadening single photon pulses signal inputs to based on FPGA extracts circuit;
2.7.1] the first counter counts the broadening single photon pulses signal of input based on the signal transmission extraction circuit of FPGA;
2.7.2] logic controller is after rising edge bit synchronization signal at every turn being detected, count value in first counter is deposited buffer, reset to the first counter, the first counter after reset starts again to count the broadening single photon pulses signal of input simultaneously;
2.7.3] number of photons comparator compares the value in buffer and threshold register:
If buffer count value is greater than the threshold value in threshold register, be then high level signal, export transmitted information " 1 ", perform step 2.7.2 simultaneously];
If buffer count value is less than the threshold value in threshold register, be then low level signal, export transmitted information " 0 ", perform step 2.7.2 simultaneously];
Threshold value in described threshold register is greater than the mean value of dark counting in bit synchronization signal, is less than the mean value of single photon pulses in bit synchronization signal;
2.8] transmitted information is demodulated.
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| CN103595471B (en) * | 2013-12-02 | 2019-07-26 | 吴东辉 | A kind of method and system and device of space optical communication |
| CN104502917B (en) * | 2014-12-09 | 2017-03-29 | 中国科学院西安光学精密机械研究所 | Regulate and control to strengthen the method and system of photon counting laser radar detection sensitivity using photon |
| CN104954069B (en) * | 2015-06-23 | 2017-08-29 | 西安空间无线电技术研究所 | A kind of satellite laser communications catching method based on flashlight |
| CN106027162A (en) * | 2016-05-20 | 2016-10-12 | 中国人民解放军信息工程大学 | Optical communication system and method |
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