CN111953470B - Secret communication system based on chaos coherent mask - Google Patents
Secret communication system based on chaos coherent mask Download PDFInfo
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- CN111953470B CN111953470B CN202010685300.3A CN202010685300A CN111953470B CN 111953470 B CN111953470 B CN 111953470B CN 202010685300 A CN202010685300 A CN 202010685300A CN 111953470 B CN111953470 B CN 111953470B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/001—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols using chaotic signals
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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
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external 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
Abstract
The invention belongs to the technical field of chaotic secret communication in the field of optical fiber communication, and discloses a secret communication system based on a chaotic coherent mask, which comprises a driving light source, a response laser I, a first continuous light laser, a first I/Q modulation device, a serial-parallel conversion device, a first wavelength division multiplexer, a long-distance optical fiber link, a second wavelength division multiplexer, a response laser II, a third photoelectric detector, a fourth photoelectric detector, a second I/Q modulation device, a second continuous light laser, a first 90-degree frequency mixer, a second 90-degree frequency mixer, a first balance detector, a second balance detector and a parallel-serial conversion device. The invention realizes the asynchronization of the driving and the response lasers through the common driving, and the high-quality chaotic synchronization among the response lasers; the information of the sending end is hidden in the chaotic signal and then IQ modulation is carried out on the continuous optical carrier, the receiving end realizes the demodulation of the chaotic signal through chaotic synchronization and then obtains the information through coherent demodulation, and safe and high-speed chaotic secret communication can be realized.
Description
Technical Field
The invention belongs to the technical field of chaotic secret communication in the field of optical fiber communication, and particularly relates to a secret communication system based on a chaotic coherent mask.
Background
The chaotic optical communication has the advantages of hardware encryption, compatibility with the existing optical communication system, suitability for high-speed (Gbit/s) and long-distance (km) secret communication and the like, and is receiving wide attention. In 2005, field experiments based on chaotic communication of semiconductor lasers with an encrypted transmission rate of 1Gb/s were performed over a 120-km optical fiber link (Nature, Vol.438, P.343-346,2005.). In 2010 field experiments based on chaotic communication of Optical Electrical Oscillators (OEOs) achieved information transmission rates of 10 Gb/s over a link of more than 100 km (IEEE j. Quantum Electron, vol.46, p.1430, 2010). However, the rate of chaotic optical communication is still far lower than the transmission rate of the conventional coherent optical communication, which is 100Gb/s or more. Therefore, one of the key problems of chaotic secure communication is to increase the chaotic optical communication rate.
There are two common methods for increasing the optical chaotic communication rate. Firstly, the bandwidth of the chaotic carrier is improved: the bandwidth of the chaotic semiconductor laser is limited by relaxation frequency, and the chaotic bandwidth of the semiconductor laser can be improved by three times to about 20GHz by external light injection, such as the documents Opt Express, Vol 23, P.1470, 2015 and Opt Lett, Vol 34, P.1144, 2009. In addition, for example, in the references opt. Lett, vol. 36, p.2833, 2011, the chaos bandwidth of the quadrature phase shift keying modulation using dual delay feedback in the OEO system is also increased to 13 GHz. However, further enhancement of bandwidth requires complex system architectures or high-speed optoelectronic devices, thereby increasing the cost of the device and the difficulty of device integration. Another effective method for increasing the chaos communication rate is to use a high-order modulation method such as Quadrature Amplitude Modulation (QAM). Optical QAM in coherent optical communications enables higher modulation rates and greater capacity. At present, 30Gb/s encrypted information transmission can be realized by using an intensity chaos hidden intensity modulated duobinary signal and an electrical 16QAM signal of an OEO system, which are disclosed in the references Opt. Lett, Vol.43, P.1323, 2018, and Opt. Lett, Vol. 44, P.5776, 2019. However, the above-mentioned OEO system uses only the intensity of the optical carrier without using the phase of the optical carrier, and further, the structure of the OEO system is complicated, and the cost is high, which is not advantageous for practical use and integration. The semiconductor laser has a simple structure and low cost, is the most common transceiver in the chaos secret communication research at present, but does not realize high-order modulation modes such as multi-dimensional optical QAM combining the intensity and the phase of the optical carrier, and the encryption rate and the safety of transmission information of the semiconductor laser are further improved. Therefore, it is necessary to find a scheme for improving the information transmission rate and ensuring the safety of the transmitted information by combining the semiconductor laser chaotic communication and the coherent optical communication.
Disclosure of Invention
The invention overcomes the defects of the prior art, and solves the technical problems that: the secret communication system based on the chaotic coherent mask is high in communication speed and safety.
In order to solve the technical problems, the invention adopts the technical scheme that: a secret communication system based on a chaotic coherent mask comprises a driving light source, a first coupler, a first response laser, a second coupler, a first photoelectric detector and a second photoelectric detector; the device comprises a first adder, a second adder, a first continuous light laser, a first I/Q modulation device, a serial-parallel conversion device, a first wavelength division multiplexer, a long-distance optical fiber link, a second wavelength division multiplexer, a response laser, a second optical coupler, a third photoelectric detector, a fourth photoelectric detector, a second I/Q modulation device, a third coupler, a second continuous light laser, a first 90-degree frequency mixer, a second 90-degree frequency mixer, a first balanced detector, a second balanced detector and a parallel-serial conversion device;
the light emitted by the driving light source is divided into two beams by the first coupler and then respectively injected into the first response laser and the second response laser to generate chaotic light output;
the chaotic laser responding to the first output of the laser is divided into two beams of light through the second coupler, the two beams of light are respectively detected by the first photoelectric detector and the second photoelectric detector, converted into electric signals and then respectively output to the first input ends of the first adder and the second adder, the confidential information is converted by the serial-parallel conversion device and then respectively output to the first adder) and the second input end of the second adder, and the output ends of the first adder and the second adder are respectively connected with the two input ends of the first I/Q modulation device; the laser output by the first continuous light laser enters a first input end of a first 90-degree frequency mixer after IQ modulation is carried out on the laser through a first I/Q modulation device loaded with information and then sequentially passes through a first wavelength division multiplexer, a long-distance optical fiber link and a second wavelength division multiplexer;
the chaotic laser output by the second response laser is divided into two beams by the third coupler, the two beams are respectively detected by the third photodetector and the fourth photodetector, converted into electric signals and respectively output to two input ends of the second I/Q modulation device, the laser output by the second continuous laser is divided into two beams by the fourth coupler, one beam is IQ modulated by the second I/Q modulation device, the second input end of the first 90-degree mixer is connected, the other beam is input to the first input end of the second I/Q modulation device, the second input end of the second 90-degree mixer is connected with the third output end of the first 90-degree mixer, output signals of the first output end and the third output end of the second 90-degree mixer are detected by the first balanced detector, and output signals of the second output end and the fourth output end are detected by the second balanced detector; the electric signals output by the first balance detector and the second balance detector are used for outputting demodulation information after passing through the parallel-serial conversion device.
The secret communication system based on the chaotic coherent mask further comprises a first circulator and a second circulator, light emitted by the driving light source is divided into two beams by the first coupler, one beam is injected into the first response laser through the first circulator to enable the first response laser to output chaotic laser, the chaotic laser output by the first response laser is output through the first circulator, the other beam is injected into the second response laser after sequentially passing through the long-distance optical fiber link of the first wavelength division multiplexer, the second wavelength division multiplexer and the second circulator to enable the second response laser to output chaotic laser, and the chaotic laser output by the second response laser is output through the second circulator.
The chaotic laser output by the first response laser and the chaotic laser output by the second response laser are synchronous and are asynchronous with the output light of the driving light source.
The driving light source is a chaotic laser or an ASE light source (amplified spontaneous emission light source).
The spectrum of the light output by the driving light source covers the spectrum of the light output by the first response laser and the spectrum of the light output by the second response laser, and the spectrum of the laser output by the driving light source is not overlapped with the spectrums of the first continuous laser and the second continuous laser.
And parameters of the first response laser and the second response laser are kept consistent, and parameters of the first continuous laser and the second continuous laser are kept consistent.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention provides a coherent mask optical communication system based on laser chaos, which drives response lasers of a sending end and a receiving end through a common signal, drives the response lasers of the sending end and the receiving end to realize high-quality chaos synchronization, hides IQ modulated information in a chaotic signal of the sending end out of synchronization with a driving signal, and ensures the safety of the information in channel transmission. The receiving end can realize the separation of chaotic interference signals and information through chaotic synchronization, and then obtains corresponding information through demodulation, thereby not only avoiding the safety problem of the traditional optical communication, but also solving the problem of limited chaotic secret communication rate, and realizing safe and high-speed information transmission through a chaotic coherent mask.
2. Compared with a direct modulation and demodulation scheme of chaotic optical communication, the invention adopts an I/Q modulation scheme in coherent optical communication to load and demodulate information, and can realize higher communication rate, higher bandwidth utilization rate and higher spectrum efficiency.
3. Compared with the traditional optical communication, the invention uses the chaotic signal to realize information encryption and transmission, and utilizes the characteristics of wide band, large amplitude and noise-like of the chaotic signal to improve the safety of information transmission.
Drawings
FIG. 1 is a schematic structural diagram of a coherent mask optical communication scheme based on laser chaos according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a 90 ° hybrid employed in an embodiment of the present invention;
in the figure: 1 is a driving light source; 2 is a first coupler; 3 is a response laser I; 4 is a first circulator; 5 is a second coupler; 6 is a first photodetector; 7 is a second photodetector; 8 is a first adder; 9 is a second adder; 10 is a first continuous light laser; 11 is a first I/Q modulation device; 12 is a serial-parallel conversion device; 13 is a first wavelength division multiplexer; 14 is a long-distance optical fiber link; 15 is a second wavelength division multiplexer; 16 is a second circulator; 17 is a response laser II; 18 is a third coupler; 19 is a third photodetector; 20 is a fourth photodetector; 21 is a second I/Q modulation device; 22 is a fourth coupler; 23 is a second continuous light laser; 24 is a first 90 ° mixer; 25 is a second 90 ° mixer; 26 is a first balanced detector; 27 is a second balanced detector; 28 is a parallel-to-serial conversion device.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a secret communication system based on a chaotic coherent mask, which includes a driving light source 1, a first circulator 4, a second circulator 22, a first coupler 2, a response laser i 3, a second coupler 5, a first photodetector 6, and a second photodetector 7; a first adder 8, a second adder 9, a first continuous light laser 10, a first I/Q modulation device 11, a serial-parallel conversion device 12, a first wavelength division multiplexer 13, a long-distance optical fiber link 14, a second wavelength division multiplexer 15, and a second response laser 17; a third optical coupler 18; a third photodetector 19; a fourth photodetector 20; a second I/Q modulation device 21; a third coupler 22; a second continuous light laser 23; a first 90 ° mixer 24; a second 90 ° mixer 25; a first balanced detector 26; a second balanced detector 27 and a parallel-to-serial conversion means 28.
The device comprises a first circulator 4, a response laser I3, a second coupler 5, a first photoelectric detector 6 and a second photoelectric detector 7; the system comprises a first adder 8, a second adder 9, a first continuous light laser 10, a first I/Q modulation device 11, a serial-parallel conversion device 12, a first wavelength division multiplexer 13, a second wavelength division multiplexer 15 and a response laser II 17, wherein the first wavelength division multiplexer is positioned at an emission end; a third optical coupler 18; a third photodetector 19; a fourth photodetector 20; a second I/Q modulation device 21; a third coupler 22; a second continuous light laser 23; a first 90 ° mixer 24; a second 90 ° mixer 25; a first balanced detector 26; the second balanced detector 27 and the parallel-to-serial conversion means 28 are located at the receiving end.
After light emitted by the driving light source 1 is divided into two beams by the first coupler 2, the two beams are respectively injected into the first response laser 3 and the second response laser 17 to generate chaotic light output; a second wavelength division multiplexer 15, a second response laser 17; a third optical coupler 18; a third photodetector 19; a fourth photodetector 20; a second I/Q modulation device 21; a third coupler 22; a second continuous light laser 23; a first 90 ° mixer 24; a second 90 ° mixer 25; a first balanced detector 26; the second balanced detector 27 and the parallel-to-serial conversion means 28 are located at the receiving end, which is connected via the long-distance optical fiber link 14. In this embodiment, the driving light source 1 and the first coupler 2 are also located at the emission end.
The chaotic laser device is characterized in that light emitted by the driving light source 1 is divided into two beams through the first coupler 2, one beam is injected into the first response laser 3 through the first circulator 4 to enable the first response laser to output chaotic laser, the chaotic laser output by the first response laser 3 is output through the first circulator 4, the other beam is sequentially injected into the second response laser 17 through the first wavelength division multiplexer 13 and the long-distance optical fiber link 14, the second wavelength division multiplexer 15 and the second circulator 16 to enable the second response laser to output chaotic laser, and the chaotic laser output by the second response laser 17 is output through the second circulator 16.
The chaotic laser output by the first response laser 3 is divided into two beams of light through the second coupler 5, the two beams of light are respectively detected by the first photoelectric detector 6 and the second photoelectric detector 7, converted into electric signals and then respectively output to first input ends of a first adder 8 and a second adder 9, the confidential information is converted by the serial-parallel conversion device 12 and then respectively output to second input ends of the first adder 8 and the second adder 9, and output ends of the first adder 8 and the second adder 9 are respectively connected with two input ends of the first I/Q modulation device 11; continuous light output by the first continuous light laser 10 is subjected to IQ modulation as a light carrier by a first I/Q modulation device 11, and then enters a first input end of a first 90-degree frequency mixer 24 after sequentially passing through a first wavelength division multiplexer 13, a long-distance optical fiber link 14 and a second wavelength division multiplexer 15;
the chaotic laser output by the second response laser 17 is divided into two beams by the third coupler 18, the two beams are respectively detected by the third photodetector 19 and the fourth photodetector 20 and converted into electric signals and then respectively output to two input ends of the second I/Q modulation device 21, the continuous light output by the second continuous laser 23 is divided into two beams by the fourth coupler 22, one beam is subjected to IQ modulation by the second I/Q modulation device 21, a second input terminal of the first 90 ° hybrid 24, the other beam being input to a first input terminal of the second I/Q modulating means 25, a second input terminal of the second 90 ° hybrid 25 being connected to a third output terminal of the first 90 ° hybrid 24, output signals of a first output terminal and a third output terminal of the second 90 ° hybrid 25 being detected by a first balanced detector 26, and output signals of a second output terminal and a fourth output terminal being detected by a second balanced detector 27; the electrical signals output by the first balanced detector 26 and the second balanced detector 15 are used for outputting demodulation information after passing through a parallel-serial conversion device 28.
Specifically, in this embodiment, the chaotic laser output by the first response laser 3 and the second response laser 17 are synchronous, and are asynchronous with the output light of the driving light source 1. The synchronization in the present invention means: the correlation coefficient of the two beams of light is more than 0.8, and if the correlation coefficient is less than 0.8, the two beams of light are considered to be asynchronous. In this embodiment, the injection power and the current of the response laser are adjusted to achieve the purpose of synchronizing the two response lasers and not synchronizing with the driving light source. In this embodiment, the chaos light output by the first response laser 3 and the second response laser 17 is not synchronized with the output light of the driving light source 1, so as to ensure the safety of the chaos light system, and an eavesdropper cannot copy the output light of the response laser through the output light of the driving light source.
Further, in this embodiment, the spectrum of the light output by the driving light source 1 covers the spectrum of the light output by the first response laser 3 and the spectrum of the light output by the second response laser 17, so as to ensure that the driving light source can drive the response lasers at the transmitting end and the receiving end, and the response lasers at the transmitting end and the receiving end are synchronized with each other at high quality. In addition, the spectrum of the laser light output by the driving light source 1 does not overlap with the spectra of the first continuous laser 10 and the second continuous laser 23, so as to prevent the chaotic carrier and the continuous optical carrier from crosstalk with each other, thereby ensuring stable high-quality synchronization between the responding lasers and good demodulation performance of information.
In addition, in this embodiment, the parameters of the first response laser 3 and the second response laser 17 are kept consistent, and the parameters of the first continuous laser 10 and the second continuous laser 23 are kept consistent. Specifically, the parameter keeping consistent in the invention means that the chips of the two lasers come from the same wafer, and the central wavelength, the P-I curve skew efficiency and the threshold current mismatch of the lasers are all less than 2%. By keeping the parameters consistent, the corresponding lasers can be enabled to output synchronized laser light.
The working principle of the embodiment of the invention is as follows:
1) the chaotic synchronization optical path is driven together.
The driving light source 1 is driven to be divided into two paths through the first coupler 2, and respectively input into the first response laser 3 through the first circulator 4 and input into the second response laser 17 through the first wavelength division multiplexer 13, the long-distance optical fiber link 14, the second wavelength division multiplexer 15 and the circulator 16, and the injection of the driving light source 1 is to enable the first response laser 3 and the second response laser 17 to generate chaotic laser output. In the process, the first response laser 3 and the second response laser 17 can be synchronized through parameter adjustment, and the two response lasers can be out of synchronization with the driving light source 1 through parameter adjustment. The response laser I3 and the response laser II 17 have bandwidth enhancement under the injection of the driving light source 1, and can load information. In this embodiment, the driving light source 1 is a chaotic laser or an ASE light source (amplified spontaneous emission light source).
2) And (4) loading information.
The chaotic light signal output by the first response laser 3 at the transmitting end is divided into two beams after passing through the first circulator 4 and the coupler 5, and the two beams are converted into electric signals through the first photoelectric detector 6 and the second photoelectric detector 7 respectively. The original information is added with the electric signals converted by the first photoelectric detector 6 and the second photoelectric detector 7 through the first adder 8 and the second adder 9 after passing through the serial-parallel conversion device 12, and then is used as new confidential information to be respectively input from two input ends of the first I/Q modulation device 11, the first I/Q modulation device 11 modulates the continuous optical carrier generated by the first continuous optical laser 10, and the continuous optical carrier and the information which are subjected to the chaos coherent mask are output after modulation. The optical signal output by the first I/Q modulation device 11 and passing through the chaotic coherent mask passes through the first wavelength division multiplexer 13, the long-distance optical fiber link 14, and the second wavelength division multiplexer 15 and is then transmitted to the receiving end for information demodulation.
3) And (5) information demodulation.
The chaotic signal output by the second response laser 17 is divided into two beams after passing through the second circulator 16 and the third optical coupler 18, and the two beams are converted into electric signals through a third photoelectric detector 19 and a third photoelectric detector 20 respectively. These two electrical signals are input to the second I/Q modulation device 21. The light output by the second continuous light laser 23 is divided into two paths by the third coupler 22, one path is input into the second I/Q modulation device 21, and the other path is output into the 90 ° frequency mixer 25. The continuous optical carrier signal I/Q modulated by the chaotic signal output from the second I/Q modulation device 21 is input from the first input terminal of the first 90 ° hybrid 24. The optical signal received by the second wavelength division multiplexer 15 through the chaotic coherent mask is input from a second input terminal of the first 90 ° hybrid 24. Continuous light output by the first 90 ° mixer 24 and subjected to IQ modulation by information enters the second 90 ° mixer 25, and optical information output by the 90 ° mixer 25 is input to the parallel-serial conversion device 28 after passing through the balanced detectors 26 and 27 respectively to demodulate corresponding information.
Fig. 2 is a schematic diagram of a 90 ° mixer used in the embodiment of the present invention. Signal E 1 Sum signal E 2 After passing through the first 90 ° hybrid 24, the four outputs are:
the signal E, which is input from the first 90 ° hybrid 24 into the second 90 ° hybrid 25 c Is continuous light IQ-modulated with information. Then, the continuous light output from the second continuous light laser 23 and the continuous light signal output from the second continuous light laser are input to the second 90 ° hybrid 25, and coherent demodulation of information is performed. The parameters of the first continuous light laser 10 and the second continuous light laser 23 are kept consistent, and the first response laser 3 and the second response laser 17 are in chaotic synchronization.
In summary, the invention provides a coherent mask optical communication system based on laser chaos, which drives the response lasers of the transmitting end and the receiving end through a common signal, so that the response lasers of the transmitting end and the receiving end realize high-quality chaos synchronization, and hide IQ-modulated information in the chaotic signal of the transmitting end in synchronization with the driving signal, thereby ensuring the safety of the information in channel transmission. The receiving end can realize the separation of chaotic interference signals and information through chaotic synchronization, and then obtains corresponding information through coherent demodulation. The method not only avoids the safety problem of the traditional optical communication, but also solves the problem of limited chaotic secret communication rate, and realizes safe and high-speed information transmission through the chaotic coherent mask.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (3)
1. A secret communication system based on a chaotic coherent mask is characterized by comprising a driving light source (1), a first coupler (2), a response laser I (3), a second coupler (5), a first photoelectric detector (6) and a second photoelectric detector (7); the device comprises a first adder (8), a second adder (9), a first continuous light laser (10), a first I/Q modulation device (11), a serial-parallel conversion device (12), a first wavelength division multiplexer (13), a long-distance optical fiber link (14), a second wavelength division multiplexer (15), a response laser II (17), a third coupler (18), a third photoelectric detector (19), a fourth photoelectric detector (20), a second I/Q modulation device (21), a fourth coupler (22), a second continuous light laser (23), a first 90-degree frequency mixer (24), a second 90-degree frequency mixer (25), a first balance detector (26), a second balance detector (27) and a parallel-serial conversion device (28);
light emitted by the driving light source (1) is divided into two beams by the first coupler (2), and the two beams are respectively injected into the first response laser (3) and the second response laser (17) to generate chaotic light output;
the chaotic laser output by the first response laser (3) is divided into two beams of light through the second coupler (5), the two beams of light are respectively detected by the first photoelectric detector (6) and the second photoelectric detector (7), converted into electric signals and then respectively output to first input ends of a first adder (8) and a second adder (9), confidential information is converted by a serial-parallel conversion device (12) and then respectively output to second input ends of the first adder (8) and the second adder (9), and output ends of the first adder (8) and the second adder (9) are respectively connected with two input ends of the first I/Q modulation device (11); laser output by the first continuous light laser (10) is subjected to IQ modulation by a first I/Q modulation device (11) loaded with information, and then enters a first input end of a first 90-degree frequency mixer (24) after sequentially passing through a first wavelength division multiplexer (13), a long-distance optical fiber link (14) and a second wavelength division multiplexer (15);
responding to the chaotic laser output by the second laser (17), dividing the chaotic laser into two beams through a third coupler (18), respectively detecting the two beams by a third photoelectric detector (19) and a fourth photoelectric detector (20), converting the two beams into electric signals, and respectively outputting the electric signals to two input ends of a second I/Q modulation device (21), dividing the laser output by a second continuous laser (23) into two beams through a fourth coupler (22), connecting one beam with a second input end of a first 90-degree frequency mixer (24) after IQ modulation is carried out on the beam by the second I/Q modulation device (21), inputting the other beam into a first input end of a second 90-degree frequency mixer (25), connecting a second input end of the second 90-degree frequency mixer (25) with a third output end of a first 90-degree frequency mixer (24), detecting output signals of a first output end and a third output end of the second 90-degree frequency mixer (25) by a first balance detector (26), the output signals of the second and fourth output terminals are detected by a second balanced detector (27); the electric signals output by the first balanced detector (26) and the second balanced detector (27) are used for outputting demodulation information after passing through a parallel-serial conversion device (28);
the chaotic laser output by the first response laser (3) and the second response laser (17) is synchronous, and is asynchronous with the output light of the driving light source (1);
the spectrum of the light output by the driving light source (1) covers the spectrum of the light output by the response laser I (3) and the response laser II (17), and the spectrum of the laser output by the driving light source (1) is not overlapped with the spectrums of the first continuous light laser (10) and the second continuous light laser (23);
the parameters of the first response laser (3) and the second response laser (17) are kept consistent, and the parameters of the first continuous light laser (10) and the second continuous light laser (23) are kept consistent.
2. The secret communication system based on the chaotic coherent mask, according to claim 1, further comprising a first circulator (4) and a second circulator (16), wherein after light emitted by the driving light source (1) is divided into two beams by the first coupler (2), one beam is injected into the first response laser (3) through the first circulator (4) to output chaotic laser, the chaotic laser output by the first response laser (3) is output through the first circulator (4), the other beam is injected into the second response laser (17) through the first wavelength division multiplexer (13) and the long-distance optical fiber link (14), the second wavelength division multiplexer (15) and the second circulator (16) in sequence to output chaotic laser, and the chaotic laser output by the second response laser (17) is output through the second circulator (16).
3. A chaotic coherent mask based secret communication system according to claim 1, wherein the driving light source (1) is a chaotic laser or an ASE light source.
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