CN102638301A - Optical signal modulating and demodulating device and optical signal modulating and demodulating method for space optical communication - Google Patents
Optical signal modulating and demodulating device and optical signal modulating and demodulating method for space optical communication Download PDFInfo
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Abstract
An optical signal modulating and demodulating device for space optical communication comprises a transmitter and a receiver. The transmitter comprises an optical source, an intensity modulator and an optical emitting antenna which are arranged along an optical path in sequence. The receiver is provided with an optical receiving antenna, a single-photon detector, a preamplifier, a signal and noise comparator, a monostable trigger and an FPGA (field programmable gate array) transmission signal extracting circuit in sequence according to the signal transmission direction. An optical signal modulating and demodulating method for space optical communication includes: firstly, connecting the transmitter and the receiver synchronously; secondly, transmitting and demodulating information and the like. Aiming to meet the requirements of low power consumption and ultra-remote communication for the current space optical communication, the optical signal modulating and demodulating method based on single-photon detection has the advantages of ultrahigh signal light receiving flexibility, low error rate, simple structure, light weight, low power consumption and the like.
Description
Technical field
The present invention relates to the space communications technique field, the particularly modulation of light signal in the space optical communication, survey, separate and be in harmonious proportion synchronously.
Background technology
Space optical communication is the focus that various countries are competitively studied, and low-power consumption, overlength distance communication are one of space optical communication key technical problems that will solve.The modulation and demodulation of light signal mainly contain two kinds at present in the space optical communication.A kind of is direct intensity modulated/direct detection system, and another kind is relevant modulation/heterodyne detection system.
In direct intensity modulated/direct detection system, transmitting terminal sends the information transmitted of wanting through the intensity of light carrier is directly modulated, like OOK (break-make modulation), PPM (pulse position modulation) etc.At receiving terminal, the optical lens antenna focuses on detector with incident light, after detector receives incident light, light signal is directly changed into current signal, and the current signal of exporting through the demodulation detector obtains institute's information transmitted.According to the opto-electronic conversion law, the electric current of detector output is directly proportional with luminous power, therefore directly detects the power detection and the irrelevant detection of being light again.The direct detection system of intensity modulated/directly, have simple in structure, advantage such as realization easily, but that shortcoming is a receiving sensitivity is low.
In relevant modulation/heterodyne detection system, transmitting terminal sends the information transmitted of wanting through the shift frequency of optical carrier and phase shift are modulated, like PSK (phase-shift keying).After receiving terminal optical lens antenna receives the flashlight of incident, be concerned with a local oscillator light.Detector property is equivalent to frequency mixer, and it is the difference frequency component of flashlight and local oscillator light accordingly, and what detector was exported is the intermediate frequency photoelectric current.After the current signal process intermediate frequency amplification filtering of detector output, realize demodulating information through frequency discrimination and phase demodulation.Relevant modulation/heterodyne detection system has the high advantage of receiving sensitivity, but has increased local oscillator light at receiving terminal, and it is relatively stricter to require local oscillator light and flashlight on spatial coherence, to require, so system configuration is complicated, and power consumption is big.
The single-photon detecting survey technology is a kind of Detection Techniques with single photon detection sensitivity, has very high sensitivity.It is passable that the single-photon detecting survey technology is used for optical communication, reduces power consumption, realizes overlength distance communication.Patent (application number: 201110166120.5) proposed a kind of overlength distance optical communication system and method based on single photon detection; The optical communication system transmitting terminal adopts Polarization Modulation; When sending signal " 0 "; Send the horizontal polarization light pulse with electronics control laser, in the time of sending signal " 1 ", send the horizontal polarization light pulse with electronics control laser.The receiving terminal of optical communication system adopts polarization splitting prism that the flashlight of accepting is divided into horizontal polarization and vertical polarization, receives horizontal polarization and vertical polarization with two single-photon detectors respectively, decodes signal " 1 " and " 0 ".Be not difficult to find out the problem that above-mentioned patent application exists: after 1) this patent application does not provide single-photon detector and receives level and vertical polarization light pulse, the method for extraction signal " 1 " and " 0 ".Only provided the Polarization Modulation method of flashlight.2) this patent application increases the complexity of system, needs accurate electronics control laser to produce different polarised lights at transmitting terminal, and receiving terminal needs polarization spectroscope and two single-photon detectors.3) error rate of system is high, and moving back of channel is inclined to one side, system's polarization contrast is not high and dark counts etc. all will make the data that receive invalid.
Summary of the invention
The objective of the invention is to,, propose a kind of modulation and demodulation apparatus and method based on light signal in the space optical communication of single photon detection to the requirement of current space optical communication to low-power consumption, overlength distance communication.
Technical solution of the present invention is following:
The modulation and demodulation device of light signal comprises transmitter and receiver in a kind of space optical communication, and its special character is: said transmitter comprises light source, intensity modulator and the optical transmitting antenna that sets gradually along light path,
Said receiver according to side signal transmission to being disposed with optical receiver antenna, single-photon detector, preamplifier, noise comparator, monostable flipflop and extracting circuit based on the transmission signals of FPGA,
Said transmission signals 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; Said monostable flipflop output is connected with first counter with the synchronizing signal extraction module simultaneously; The output of said first counter is through buffer and number of photons comparator; The output of said synchronizing signal extraction module is failed through logic controller, buffer and is connected with the number of photons comparator; Said threshold register is connected with the number of photons comparator, and said logic controller provides reset signal to first counter.
Above-mentioned Extraction of Bit Synchronization Signal module comprises gate gating signal transmitter, a plurality of second counter, comparator and selector; Said gate gating signal transmitter produces the multiplexing gate gating signal; One second counter of every road door gating signal control; The input of each second counter is connected with the output of monostable flipflop; The output of each second counter is connected with comparator, and the output of said comparator is connected with selector, and said gate gating signal transmitter produces the 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 the fast current sense amplifier.
The modulation and demodulation method of light signal in a kind of space optical communication, its special character is: may further comprise the steps:
1] transmitter is set up with receiver and is connected synchronously:
1.1] light source passes through intensity modulator, optical transmitting antenna is launched the coordination code optical signal;
1.2] optical receiver antenna reception coordination code optical signal, through single-photon detector, preamplifier, noise comparator, monostable flipflop, send to the Extraction of Bit Synchronization Signal module;
1.3] the extraction bit synchronization signal:
1.3.1] to produce the cycle identical with the bit synchronization signal cycle for the door strobe generator, the multiplexing gate gating signal of out of phase;
1.3.2] a plurality of second counters with 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 the door gating signal is high level, the input single photon pulses is counted, when the door gating signal is low level, the input single photon pulses is not counted;
1.3.3] count value of comparator through more a plurality of second counters, the sequence number of second counter of count value maximum is sent to the input of selector;
1.3.4] selector selects the corresponding gate gating signal of second counter to export as bit synchronization signal according to the second counter sequence number of being imported;
1.4] bit synchronization signal exports logic controller to, transmitter is set up with receiver and is connected synchronously;
2] emission information, demodulating information:
2.1] light source sends optical carrier, intensity modulator to the intensity of optical carrier modulate and send to transmit effective light signal of information, effectively light signal sends through optical transmitting antenna;
2.2] effectively light signal will decay to the effective light signal of single photon attitude through behind the remote channel;
2.3] the reception optical antenna of receiver end focuses on single-photon detector with the effective light signal of single photon attitude that receives, the discrete single photon pulses signal of single-photon detector output;
2.4] anti-phase amplification, the single photon pulses signal that obtains amplifying are carried out in the pulse of discrete single photon pulses signal;
2.5] utilize the noise comparator that the single photon pulses signal after amplifying is screened, the filtering noise pulse,
Said input signal-to-noise ratio is higher than noise level than the threshold value of device, and is lower than the amplitude of the single photon pulses signal of detector output;
2.6] utilize monostable flipflop that the single photon pulses signal of noise comparator output is carried out broadening output broadening single photon pulses signal;
2.7] broadening single photon pulses signal inputs to based on the transmission signals of FPGA and extract circuit;
2.7.1] first comparator counts based on the broadening single photon pulses signal that the transmission signals of FPGA extracts circuit input;
2.7.2] logic controller is behind the rising edge that at every turn detects bit synchronization signal; Deposit buffer to the count value in first counter; Simultaneously first counter is resetted, the counter after resetting begins the broadening single photon pulses signal of input is counted again;
2.7.3] the number of photons comparator value in buffer and the threshold register relatively:
If count value is greater than the threshold value in the threshold register in the buffer, then be high level signal, output transmitted information " 1 ", execution in step 2.7.2 simultaneously];
If count value is less than the threshold value in the threshold register in the buffer, then be low level signal, output transmitted information " 0 ", execution in step 2.7.2 simultaneously];
Threshold value in the said threshold register is greater than the mean value of dark counts in the bit synchronization signal, less than the mean value of single photon pulses in the bit synchronization signal;
2.8] demodulate transmitted information.
The advantage that the present invention had:
1, has very high flashlight receiving sensitivity.The present invention proposes the modulation and demodulation apparatus and method of space optical communication, is based on the single-photon detecting survey technology.Detector is operated in photon counting mode, comes restituted signal through the umber of pulse to the single photon of detector output, rather than comes restituted signal through the electric current that detects detector output.Has very high detectivity.Thereby lower power consumption capable of using realizes the space optical communication of overlength distance.
2, the error rate is low.The present invention one is that the method for utilizing threshold value to screen is removed the dark noise in the detector output pulse, the 2nd, utilize the method for the number of single photon pulses in the bit synchronization signal cycle greater than threshold value, and remove the influence of dark counts to signal extraction.Therefore system noise and dark counts are very little to the extraction influence of signal, so the error rate is very low.
3, simple in structure, in light weight, 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 direct modulation of light intensity, like 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 simple in structure; In light weight, advantage such as low in energy consumption.
4, flexibility that tool is high and integrated level are high, but the FPGA of utilization overprogram of the present invention realizes synchronously and the extraction of signal having very high flexibility and integrated level.
Description of drawings
Fig. 1 is the structural representation of modulation and demodulation device that the present invention is based on the space optical communication of single photon detection;
Fig. 2 is the demodulation sequential chart based on the signal of single photon detection;
Fig. 3 is the structural representation that extracts circuit based on the transmission signals of 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, the modulation and demodulation device of light signal comprises transmitter and receiver in the space optical communication, and transmitter comprises light source, intensity modulator and the optical transmitting antenna that sets gradually along light path,
Receiver according to side signal transmission to being disposed with optical receiver antenna, single-photon detector, preamplifier, noise comparator, monostable flipflop and extracting circuit based on the transmission signals of FPGA.
Single-photon detector is photomultiplier, microchannel plate or snowslide APD detector.Preamplifier is the fast current sense amplifier.
As shown in Figure 3; Transmission signals extraction circuit based on FPGA comprises Extraction of Bit Synchronization Signal module, first counter, logic controller, buffer, threshold register and number of photons comparator; The monostable flipflop output is connected with first counter with the synchronizing signal extraction module simultaneously; The output of first counter is through buffer and number of photons comparator; The output of synchronizing signal extraction module is failed through logic controller, buffer and is connected with the number of photons comparator, and threshold register is connected with the number of photons comparator, and logic controller provides reset signal to first counter.
As shown in Figure 4; The Extraction of Bit Synchronization Signal module comprises gate gating signal transmitter, a plurality of second counter, comparator and selector; Gate gating signal transmitter produces the multiplexing gate gating signal; One second counter of every road door gating signal control, the input of each second counter is connected with the output of monostable flipflop, and the output of each second counter is connected with comparator; The output of comparator is connected with selector, and gate gating signal transmitter produces the multiplexing gate gating signal and inputs to selector.
The modulation and demodulation method of light signal in a kind of space optical communication may further comprise the steps:
1] transmitter is set up with receiver and is connected synchronously:
1.1] light source passes through intensity modulator, optical transmitting antenna is launched the coordination code optical signal;
1.2] optical receiver antenna reception coordination code optical signal, through single-photon detector, preamplifier, noise comparator, monostable flipflop, send to the Extraction of Bit Synchronization Signal module;
1.3] the extraction bit synchronization signal:
1.3.1] to produce the cycle identical with the bit synchronization signal cycle for the door strobe generator, the multiplexing gate gating signal of out of phase;
1.3.2] a plurality of second counters with 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 the door gating signal is high level, the input single photon pulses is counted, when the door gating signal is low level, the input single photon pulses is not counted;
1.3.3] count value of comparator through more a plurality of second counters, the sequence number of second counter of count value maximum is sent to the input of selector;
1.3.4] selector selects the corresponding gate gating signal of second counter to export as bit synchronization signal according to the second counter sequence number of being imported;
1.4] bit synchronization signal exports logic controller to, transmitter is set up with receiver and is connected synchronously;
2] emission information, demodulating information:
2.1] light source sends optical carrier, intensity modulator to the intensity of optical carrier modulate and send to transmit effective light signal of information, effectively light signal sends through optical transmitting antenna;
2.2] effectively light signal will decay to the effective light signal of single photon attitude through behind the remote channel;
2.3] the reception optical antenna of receiver end focuses on single-photon detector with the effective light signal of single photon attitude that receives, the discrete single photon pulses signal of single-photon detector output;
2.4] anti-phase amplification, the single photon pulses signal that obtains amplifying are carried out in the pulse of discrete single photon pulses signal;
2.5] utilize the noise comparator that the single photon pulses signal after amplifying is screened, the filtering noise pulse,
Said input signal-to-noise ratio is higher than noise level than the threshold value of device, and is lower than the amplitude of the single photon pulses signal of detector output;
2.6] utilize monostable flipflop that the single photon pulses signal of noise comparator output is carried out broadening output broadening single photon pulses signal; Noise pulse in the method removal detector output pulse of employing threshold ratio and part dark pulse are to improve signal to noise ratio.
2.7] broadening single photon pulses signal inputs to based on the transmission signals of FPGA and extract circuit; Adopt monostable flipflop to come the level of conversion single photon pulses and single photon pulses is carried out broadening, so that be complementary with signal extraction and synchronous circuit based on FPGA.
2.7.1] first comparator counts based on the broadening single photon pulses signal that the transmission signals of FPGA extracts circuit input;
2.7.2] logic controller is behind the rising edge that at every turn detects bit synchronization signal; Deposit buffer to the count value in first counter; Simultaneously first counter is resetted, the counter after resetting begins the broadening single photon pulses signal of input is counted again;
2.7.3] the number of photons comparator value in buffer and the threshold register relatively:
If count value is greater than the threshold value in the threshold register in the buffer, then be high level signal, output transmitted information " 1 ", execution in step 2.7.2 simultaneously];
If count value is less than the threshold value in the threshold register in the buffer, then be low level signal, output transmitted information " 0 ", execution in step 2.7.2 simultaneously];
Threshold value in the said threshold register is greater than the mean value of dark counts in the bit synchronization signal, less than the mean value of single photon pulses in the bit synchronization signal;
2.8] demodulate transmitted information.
Embodiment:
1, the method for extraction bit synchronization signal is following:
1.1 before secured transmission of payload data, transmit the bit synchronization sign indicating number earlier, to extract bit synchronization signal.
1.2 under the modulation of synchronous code on the throne, transmitter sends and bit synchronization signal, the periodic square wave light signal that the cycle is identical with phase place.
1.3 after optical receiver received the light signal that is used for Extraction of Bit Synchronization Signal, the single photon pulses of monostable flipflop output was input to based on the Extraction of Bit Synchronization Signal module in the signal extraction module of FPGA.
1.4 the extraction module of synchronizing signal is as shown in Figure 4, comprises gate gating signal transmitter, counter, comparator, selector.The method for distilling of bit synchronization signal is:
1.4.1 it is identical with the bit synchronization signal cycle that the door strobe generator produces the cycle, the multiplexing gate gating signal of out of phase.
1.4.2 have a counter of gating function 1～4 under the control of out of phase door gating signal, respectively the single photon pulses of input counted.When the door gating signal is high level, the input single photon pulses is counted, when the door gating signal is low level, the input single photon pulses is not counted.
1.4.3 comparator obtains the sequence number of the second maximum counter of count value through comparing second count value of counter 1～4, and the input of the selector that sends sequence number.
1.4.4 selector selects wherein one tunnel the most synchronous gate gating signal to export as bit synchronization signal according to the counter sequence number imported.If because the bit synchronization signal of gate gating signal that is produced and transmitting terminal is synchronous more, then the value of counter is big more.
4 the gate gating signals of only drawing among Fig. 4,4 counters.Gate gating signal sum counter is many more, and the bit synchronization signal that is produced is accurate more.
The bit synchronization signal input logic controller that is extracted.After extracting bit synchronization signal, the beginning secured transmission of payload data.
2, beginning secured transmission of payload data:
2.1, transmitter terminal, the intensity of the optical carrier that intensity modulator sends light source is directly modulated and is sent the information transmitted of wanting, like OOK (break-make modulation).Light signal after the modulation sends through optical transmitting antenna.
It is as shown in Figure 2,
2.2, light signal is through behind the remote channel, very faint with decay is the single photon attitude.
2.3, the reception optical antenna of receiver end focuses on single-photon detector with the light signal that receives.
2.4, single-photon detector receives the utmost point weak one of channel decay, the single photon pulses signal that output is discrete.Single-photon detector can adopt photomultiplier, microchannel plate, and snowslide APD surveys.
2.5, the pulse amplitude of single-photon detector output is very little, therefore the discrete pulse signal of single-photon detector output is carried out anti-phase and amplifies.Preamplifier adopts the fast current sense amplifier.
2.6, adopt comparator that single photon pulses is screened.Threshold value is set is higher than noise level, should be lower than the amplitude of the single photon pulses of detector output simultaneously, with the filtering noise pulse.Because in the pulse of detector output,, also comprise the dark counts pulse of noise pulse and amplitude except the pulse of representing single photon is arranged.
2.7, because the pulse signal of comparator output is very narrow, therefore import monostable flipflop with signal broadening mate so that extract circuit input end based on the transmission signals of FPGA.
2.8, the signal pulse input of monostable flipflop output extracts circuit based on the transmission signals of FPGA and carries out signal extraction.
2.9, to extract circuit based on the transmission signals of FPGA as shown in Figure 3, comprises the Extraction of Bit Synchronization Signal module, counter, logic controller, buffer, threshold register and comparator.
Concrete method for distilling is:
1, the counter that has reset function is counted the single photon pulses of the FPGA of input.
2, as shown in Figure 5, logic controller is deposited buffer to the count value in the counting behind the rising edge that at every turn detects synchronizing signal, simultaneously counter is resetted.Counter after resetting begins the single photon pulses of input is counted again.The value of therefore depositing in the buffer is the counting of single photon pulses in each pulse spacing of synchronizing signal.
3, comparator compares the value in buffer and the threshold register, if the buffer intermediate value greater than the preset value in the threshold register, is exported high level signal, representative " 1 " deposits buffer in up to next count value.If the buffer intermediate value is less than the preset value in the threshold register, the output low level signal is represented " 0 ", deposits buffer in up to next count value, thus the information of demodulating.
4, the threshold value in the threshold register should be greater than the mean value of dark counts in the bit synchronization signal, less than the mean value of single photon pulses in the bit synchronization signal.Because the input transmission signals extracts the signal of circuit, except the pulse of representing single photon, also have the amplitude a small amount of dark noise pulse suitable with single photon pulses, this pulse can't be removed before signal gets into the extraction circuit, and occurs having randomness.So when representative information " 0 ", also one or more dark counts possibly occur in the bit synchronization signal.Value through bigger threshold register is set can reduce the extraction of dark noise pulse to signal, to reduce the error rate.
Claims (5)
1. the modulation and demodulation device of light signal in the space optical communication comprises transmitter and receiver, and it is characterized in that: said transmitter comprises light source, intensity modulator and the optical transmitting antenna that sets gradually along light path,
Said receiver according to side signal transmission to being disposed with optical receiver antenna, single-photon detector, preamplifier, noise comparator, monostable flipflop and extracting circuit based on the transmission signals of FPGA,
Said transmission signals 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; Said monostable flipflop output is connected with first counter with the synchronizing signal extraction module simultaneously; The output of said first counter is through buffer and number of photons comparator; The output of said synchronizing signal extraction module is failed through logic controller, buffer and is connected with the number of photons comparator; Said threshold register is connected with the number of photons comparator, and said logic controller provides reset signal to first counter.
2. the modulation and demodulation device of light signal in the space optical communication according to claim 1; It is characterized in that: said Extraction of Bit Synchronization Signal module comprises gate gating signal transmitter, a plurality of second counter, comparator and selector; Said gate gating signal transmitter produces the multiplexing gate gating signal; One second counter of every road door gating signal control, the input of each second counter is connected with the output of monostable flipflop, and the output of each second counter is connected with comparator; The output of said comparator is connected with selector, and said gate gating signal transmitter produces the multiplexing gate gating signal and inputs to selector.
3. the modulation and demodulation device of light signal in the space optical communication according to claim 1 and 2 is characterized in that: said single-photon detector is photomultiplier, microchannel plate or snowslide APD detector.
4. the modulation and demodulation device of light signal in the space optical communication according to claim 3 is characterized in that: said preamplifier is the fast current sense amplifier.
5. the modulation and demodulation method of light signal in the space optical communication is characterized in that: may further comprise the steps:
1] transmitter is set up with receiver and is connected synchronously:
1.1] light source passes through intensity modulator, optical transmitting antenna is launched the coordination code optical signal;
1.2] optical receiver antenna reception coordination code optical signal, through single-photon detector, preamplifier, noise comparator, monostable flipflop, send to the Extraction of Bit Synchronization Signal module;
1.3] the extraction bit synchronization signal:
1.3.1] to produce the cycle identical with the bit synchronization signal cycle for the door strobe generator, the multiplexing gate gating signal of out of phase;
1.3.2] a plurality of second counters with 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 the door gating signal is high level, the input single photon pulses is counted, when the door gating signal is low level, the input single photon pulses is not counted;
1.3.3] count value of comparator through more a plurality of second counters, the sequence number of second counter of count value maximum is sent to the input of selector;
1.3.4] selector selects the corresponding gate gating signal of second counter to export as bit synchronization signal according to the second counter sequence number of being imported;
1.4] bit synchronization signal exports logic controller to, transmitter is set up with receiver and is connected synchronously;
2] emission information, demodulating information:
2.1] light source sends optical carrier, intensity modulator to the intensity of optical carrier modulate and send to transmit effective light signal of information, effectively light signal sends through optical transmitting antenna;
2.2] effectively light signal will decay to the effective light signal of single photon attitude through behind the remote channel;
2.3] the reception optical antenna of receiver end focuses on single-photon detector with the effective light signal of single photon attitude that receives, the discrete single photon pulses signal of single-photon detector output;
2.4] anti-phase amplification, the single photon pulses signal that obtains amplifying are carried out in the pulse of discrete single photon pulses signal;
2.5] utilize the noise comparator that the single photon pulses signal after amplifying is screened, the filtering noise pulse,
Said input signal-to-noise ratio is higher than noise level than the threshold value of device, and is lower than the amplitude of the single photon pulses signal of detector output;
2.6] utilize monostable flipflop that the single photon pulses signal of noise comparator output is carried out broadening output broadening single photon pulses signal;
2.7] broadening single photon pulses signal inputs to based on the transmission signals of FPGA and extract circuit;
2.7.1] first comparator counts based on the broadening single photon pulses signal that the transmission signals of FPGA extracts circuit input;
2.7.2] logic controller is behind the rising edge that at every turn detects bit synchronization signal; Deposit buffer to the count value in first counter; Simultaneously first counter is resetted, the counter after resetting begins the broadening single photon pulses signal of input is counted again;
2.7.3] the number of photons comparator value in buffer and the threshold register relatively:
If count value is greater than the threshold value in the threshold register in the buffer, then be high level signal, output transmitted information " 1 ", execution in step 2.7.2 simultaneously];
If count value is less than the threshold value in the threshold register in the buffer, then be low level signal, output transmitted information " 0 ", execution in step 2.7.2 simultaneously];
Threshold value in the said threshold register is greater than the mean value of dark counts in the bit synchronization signal, less than the mean value of single photon pulses in the bit synchronization signal;
2.8] demodulate transmitted information.
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| CN103595471A (en) * | 2013-12-02 | 2014-02-19 | 吴东辉 | Method, system and device of space optical communication |
| CN104502917A (en) * | 2014-12-09 | 2015-04-08 | 中国科学院西安光学精密机械研究所 | Method and system for enhancing photon counting laser radar detection sensitivity by using photonic regulation and control |
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| 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 |
| CN109150313A (en) * | 2018-08-15 | 2019-01-04 | 上海霍普光通信有限公司 | A kind of optical signal transmission method of low rate optical transmitter and receiver |
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