CN117978357A - Chaotic secret communication system and method based on full-optical chaotic injection double-ring electro-optical phase chaos - Google Patents
Chaotic secret communication system and method based on full-optical chaotic injection double-ring electro-optical phase chaos Download PDFInfo
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Abstract
The invention discloses a chaotic secret communication system and a chaotic secret communication method based on full-optical chaotic injection double-loop electro-optical phase chaos, wherein in the system, light of a first laser is divided into two beams by a first optical coupler, and one beam sequentially passes through a first phase modulator and the like and then enters a third phase modulator; the other beam passes through the first reflector and is optically coupled to the second branch via the circulator; the light of the second laser is divided into three beams by a second reflector and the like, the third beam is divided into two beams by a second optical coupler after passing through a phase modulator, one beam is used for channel transmission, and the other beam is connected with the first phase modulator after passing through a second adjustable optical fiber delay line and the like in sequence; the light of the third laser is divided into two beams by a third optical coupler, one beam of the light is coupled with a second optical signal, and the other beam of the light sequentially passes through a fifth phase modulator and the like and then is connected with a subtracter; the signal at the receiving end is divided into two beams by a fourth optical coupler, one beam is connected with a fifth phase modulator after passing through a fourth adjustable optical fiber delay line and the like in sequence, and the other beam recovers the plaintext information.
Description
Technical Field
The invention belongs to the technical field of optical information, and particularly relates to a chaotic secret communication system and method based on full-optical chaotic injection double-loop electro-optical phase chaos.
Background
The chaotic signal has the characteristics of unpredictable performance, noise-like performance, wide frequency band, extremely sensitive initial value and the like, has obvious advantages in the field of long-distance high-speed secret communication, realizes the secret communication by utilizing the chaotic phenomenon, is based on hardware encryption of a physical layer, and has stronger security compared with the traditional secret communication system based on application layer digital encryption.
At present, researches on an optical chaotic secret communication system mainly comprise the aspects of signal transmission rate, transmission distance, improvement of chaotic signal complexity, hiding of plaintext information, expansion of key space and the like. Therefore, the transmission rate and the complexity of the chaotic signal are improved, the key space is expanded, and meanwhile, the plaintext information participates in the generation process of the chaotic signal by reasonably adopting a phase modulation mode, so that the safety and the reliability of a communication system can be effectively improved. Based on the above, the invention provides a chaotic secret communication system and a chaotic secret communication method based on full-optical chaotic injection double-ring electro-optical phase chaos.
Disclosure of Invention
Aiming at the current situation of the prior art, the invention designs the chaotic secret communication system and the chaotic secret communication method based on full-optical chaotic injection double-loop electro-optic phase chaos by improving the complexity and the transmission rate of the chaotic signal, effectively improving the safety and the reliability of the optical chaotic communication system by adopting a means of hiding the time delay characteristic and adopting a mode of combining full-optical intensity feedback and a delayed electro-optic phase feedback loop.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the chaotic secret communication system based on full-optical chaotic injection double-ring electro-optic phase chaos comprises a transmitting end and a receiving end, wherein the transmitting end and the receiving end are connected through an optical fiber transmission channel, and the chaotic secret communication system has the following structure:
The transmitting end comprises a first branch and a second branch, wherein a first optical signal emitted by a first semiconductor laser of the first branch is divided into two beams by a first optical coupler, and one beam sequentially passes through a first phase modulator, a second phase modulator, a first adjustable optical fiber delay line, a first Mach-Zehnder interferometer, a first photoelectric detector and a first radio frequency amplifier and then is connected with a third phase modulator of the second branch; the other beam passes through the first part transparent reflector and is coupled with a second optical signal of the second branch after passing through the circulator; the second optical signal emitted by the second semiconductor laser of the second branch sequentially passes through the second part transparent reflector and the first circulator and then is divided into three beams of optical signals, the first beam is coupled with the first optical signal, the second beam of optical signals passes through the third part transparent reflector, the third beam sequentially passes through the third phase modulator and the fourth phase modulator and then is divided into two beams by the second optical coupler, one beam is used for channel transmission, and the other beam sequentially passes through the second adjustable optical fiber delay line, the second Mach-Zehnder interferometer, the second photoelectric detector and the second radio frequency amplifier and then is connected with the first phase modulator of the first branch; in this process, the plaintext information is phase-modulation encrypted by a fourth phase modulator.
The receiving end comprises a third branch and a fourth branch, a third optical signal sent by a third laser of the third branch is divided into two beams by a third optical coupler, one beam is coupled with a second optical signal passing through a third part of transparent reflector, and the other beam sequentially passes through a fifth phase modulator, a sixth phase modulator, a third adjustable optical fiber delay line, a third Mach-Zehnder interferometer, a third photoelectric detector and a third radio frequency amplifier and then enters a subtracter; the signal received by the receiving end is received by the fourth branch, the received signal is divided into two beams by the fourth optical coupler, one beam sequentially passes through the fourth adjustable optical fiber delay line, the fourth Mach-Zehnder interferometer, the fourth photoelectric detector and the fourth radio frequency amplifier and then enters the fifth phase modulator of the third branch, and the other beam sequentially passes through the subtracter, the fifth Mach-Zehnder interferometer and the fifth photoelectric detector.
As a preferred scheme, the 2PSK is used to phase modulate the chaotic signal according to the binary plaintext information to be transmitted, without any effect on the strength of the chaotic signal. The first chaotic light signal is subjected to phase modulation by using binary plaintext information in a 2PSK phase modulation mode, which also means that the plaintext information participates in the generation process of the chaotic signal.
As a preferred solution, the parameters of the corresponding devices between the transmitting end and the receiving end are the same, namely: the parameters of the first laser, the second laser and the third laser are the same; the parameters of the first optical coupler, the second optical coupler, the third optical coupler and the fourth optical coupler are the same; the parameters of the first phase modulator, the second phase modulator, the third phase modulator, the fourth phase modulator, the fifth phase modulator and the sixth phase modulator are the same; the first adjustable optical fiber delay line, the second adjustable optical fiber delay line, the third adjustable optical fiber delay line and the fourth adjustable optical fiber delay line have the same parameters; the parameters of the first Mach-Zehnder interferometer, the second Mach-Zehnder interferometer, the third Mach-Zehnder interferometer, the fourth Mach-Zehnder interferometer and the fifth Mach-Zehnder interferometer are the same; the parameters of the first photoelectric detector, the second photoelectric detector, the third photoelectric detector, the fourth photoelectric detector and the fifth photoelectric detector are the same; the parameters of the first radio frequency amplifier, the second radio frequency amplifier, the third radio frequency amplifier and the fourth radio frequency amplifier are the same.
In the invention, a first branch and a second branch of a transmitting end generate synchronous first optical chaotic signals and second optical chaotic signals through full light intensity feedback coupling, the synchronous first optical chaotic signals and the second optical chaotic signals are injected into an electro-optic phase delay oscillation feedback loop, chaotic optical signals sent out by a first radio frequency amplifier in the first branch are fed back to a third phase modulator, the chaotic optical signals sent out by the second branch are fed back to the first phase modulator, and a fourth phase modulator is utilized to carry out phase modulation on the chaotic signals and binary plaintext information in a 2PSK mode, so that a complex chaotic entropy source carrying useful information is generated, and the complex chaotic entropy source is connected with a second optical coupler and is transmitted to an optical fiber channel; at the receiving end, the third branch is the same as the first branch, the fourth branch is a recovery branch for recovering binary plaintext information, the received signal and the chaotic signal of the third branch are subjected to difference operation, and then pass through a fifth Mach-Zehnder interferometer and a fifth photoelectric detector with the same parameters, and finally the plaintext information can be recovered through a low-pass filter and optimal judgment.
Preferably, the coupling coefficient of all the couplers is 0.5.
Preferably, the signal transmission rate of the communication system is 20Gbps.
As a preferred scheme, the receiving end can recover the plaintext information through a subtracter, a Mach-Zehnder interferometer and a photoelectric detector with the same parameters.
The invention also discloses a chaotic secret communication method based on the full-optical chaotic injection double-ring electro-optical phase chaos, which comprises the following specific steps of:
At the transmitting end, optical signals emitted by the first semiconductor laser and the second semiconductor laser respectively pass through the first part transparent reflector and the second part transparent reflector to generate two synchronous optical chaotic intensity signals by feedback and coupling, and the two synchronous optical chaotic intensity signals are respectively injected into the first phase modulator and the third phase modulator through the first optical coupler and the circulator; the first branch and the second branch form an electro-optic phase delay oscillation feedback loop of a transmitting end, a 2PSK modulation mode is adopted, the phase modulation is carried out on the chaotic signal in a fourth phase modulator through binary plaintext information, when the information is 1, the phase of the chaotic signal is turned 180 degrees, when the information is 0, the phase of the chaotic signal is not turned, one part of the encrypted signal is transmitted to the first phase modulator in sequence through a second adjustable optical fiber delay line, a second Mach-Zehnder interferometer, a second photoelectric detector and a second radio frequency amplifier to form the electro-optic phase delay oscillation feedback loop, and the other part of the encrypted signal is transmitted to a receiving end through a channel;
at the receiving end, the third branch generates a chaotic signal synchronous with the first branch, the phase of the chaotic signal is turned 180 degrees by adopting a 2PSK modulation mode, the difference value operation is carried out on the chaotic signal by using a subtracter through demodulation phase, and then restored plaintext information is obtained through a fifth Mach-Zehnder interferometer and a fifth photoelectric detector with the same parameters, namely, the difference value signal is judged, when the difference value signal is 0, the plaintext information is 0, and when the difference value signal is 1, the plaintext information is 1.
Preferably, the transmission rate of the signal is set to 20Gbps.
Compared with the prior art, the invention has the beneficial effects that:
According to the chaotic secret communication system based on full-optical chaotic injection double-loop electro-optic phase chaos, the 2PSK modulation method is adopted to enable plaintext information to carry out phase modulation on a chaotic signal, and in the process, the plaintext information does not directly enter a channel for transmission, but participates in the generation process of the chaotic signal, and is further hidden in the chaotic signal, so that the complexity of the chaotic signal is further improved, and the interception of the signal is effectively avoided; meanwhile, the invention further expands the key space through the mode of cascade connection of full light intensity feedback and the electro-optic phase delay oscillation ring and the phase modulation method, is effectively lower than the violent attack of illegal stealers, and further improves the safety and reliability of the communication system; besides, the chaotic synchronization of the electro-optical part is realized through an open loop structure, so that the communication system has stronger robustness.
Drawings
The invention is described in detail below with reference to the drawings and the detailed description.
Fig. 1 is a schematic diagram of a chaotic secret communication system based on full-optical chaotic injection double-loop electro-optical phase chaos according to an embodiment of the invention.
Fig. 2 is a diagram of binary plaintext information input by a transmitting end in a chaotic secret communication system based on full-optical chaotic injection double-ring electro-optical phase chaotic according to an embodiment of the invention.
Fig. 3 is a diagram of a chaotic signal capable of representing binary information, which is primarily recovered in a chaotic secret communication system based on full-optical chaotic injection double-loop electro-optical phase chaos in an embodiment of the invention.
Fig. 4 is a binary plaintext information diagram completely recovered in a chaotic secret communication system based on full-optical chaotic injection double-ring electro-optical phase chaos according to an embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, specific embodiments of the present invention will be described below with reference to the accompanying drawings. It is obvious that the drawings in the following description are only examples of the present invention, and that other drawings and other embodiments may be obtained from these drawings by those skilled in the art without inventive effort.
As shown in fig. 1, the chaotic secret communication system based on full-optical chaotic injection double-loop electro-optical phase chaos in the embodiment of the invention comprises a transmitting end and a receiving end, wherein:
The transmitting end components comprise a first semiconductor laser 1-1, a second semiconductor laser 1-2, a first circulator, a first optical coupler 2-1, a second optical coupler 2-2, a first part transparent reflector 3-1, a second part transparent reflector 3-2, a first phase modulator 4-1, a second phase modulator 4-2, a third phase modulator 4-3, a fourth phase modulator 4-4, a first tunable optical fiber delay line 5-1, a second tunable optical fiber delay line 5-2, a first Mach-Zehnder interferometer 6-1, a second Mach-Zehnder interferometer 6-2, a first photoelectric detector 7-1, a second photoelectric detector 7-2, a first radio frequency amplifier 8-1, a second radio frequency amplifier 8-2 and a circulator 10;
The receiving end components comprise a third semiconductor laser 1-3, a third optical coupler 2-3, a fourth optical coupler 2-4, a third partially transparent reflector 3-3, a fifth phase modulator 4-5, a sixth phase modulator 4-6, a third tunable optical fiber delay line 5-3, a fourth tunable optical fiber delay line 5-4, a third Mach-Zehnder interferometer 6-3, a fourth Mach-Zehnder interferometer 6-4, a fifth Mach-Zehnder interferometer 6-5, a third photodetector 7-3, a fourth photodetector 7-4, a fifth photodetector 7-5, a third radio frequency amplifier 8-3, a fourth radio frequency amplifier 8-4 and a subtractor 9.
The transmitting end and the receiving end are connected through a standard single mode fiber 11.
The specific connection modes of the components are as follows:
In the transmitting end, the first semiconductor laser 1-1 is connected with a first port of the first coupler 2-1, a second port of the first coupler 2-1 is connected with a first port of the first phase modulator 4-1, a third port of the first coupler 2-1 is connected with a first port of the first partially transparent mirror 3-1, a second port of the first phase modulator 4-1 is connected with a first port of the second phase modulator 4-2, a second port of the second phase modulator 4-2 is connected with a first port of the first adjustable optical fiber delay line 5-1, a second port of the first adjustable optical fiber delay line 5-1 is connected with a first port of the first Mach-Zehnder interferometer 6-1, a second port of the first Mach-zehnder interferometer 6-1 is connected with a first port of the first photo detector 7-1, a second port of the first photo detector 7-1 is connected with a first port of the first photo detector 8-1, and a first port of the first photo-amplifier 8-1 is connected with a first port of the first photo-amplifier 8-1; the first port of the second semiconductor laser 1-2 is connected to the first port of the second partially transparent mirror 3-2, the second port of the second partially transparent mirror 3-2 is connected to the first port of the circulator 10, the second port of the circulator 10 is connected to the second port of the first partially transparent mirror 3-1, the third port of the circulator 10 is connected to the first port of the third phase modulator 4-3, the fourth port of the circulator 10 is connected to the first port of the third partially transparent mirror 3-3, the second port of the third phase modulator 4-3 is connected to the first port of the fourth phase modulator 4-4, the second port n2 of the fourth phase modulator 4-4 is connected to the first port of the second coupler 2-2, the second port of the second fiber-tunable delay line 5-2 is connected to the first port of the second fiber-tunable delay line 5-1, the second port of the second fiber-tunable delay line 5-2 is connected to the first port of the second interferometer 6-2, the second port of the second interferometer 6-2 is connected to the second port of the second interferometer-7, and the second port of the second interferometer-2-7 is connected to the second port of the second interferometer-2-7.
In the common transmission channel, the third port of the second coupler 2-2 is connected to the first port of the standard single-mode fiber 11, and the second port of the standard single-mode fiber 11 is connected to the first port of the fourth coupler 2-4 at the receiving end.
In the receiving end, a first port of the third semiconductor laser 1-3 is connected with a first port of the third coupler 2-3, a second port of the third coupler 2-3 is connected with a first port of the fifth phase modulator 4-5, a third port of the third coupler 2-3 is connected with a second port of the third partially transparent reflector 3-3, a second port of the fifth phase modulator 4-5 is connected with a first port of the sixth phase modulator 4-6, a second port of the sixth phase modulator 4-6 is connected with a first port of the third tunable optical fiber delay line 5-3, a second port of the third tunable optical fiber delay line 5-3 is connected with a first port of the third Mach-Zehnder interferometer 6-3, a second port of the third Mach-Zehnder interferometer 6-3 is connected with a first port of the third photoelectric detector 7-3, a second port of the third photoelectric detector 7-3 is connected with a first port of the third radio frequency amplifier 8-3, and a second port of the third subtractor 8-3 is connected with a second port of the third radio frequency amplifier 8-9; the third port of the fourth coupler 2-4 is connected to the first port of the fourth tunable optical delay line 5-4, the second port of the fourth tunable optical delay line 5-4 is connected to the first port of the fourth Mach-Zehnder interferometer 6-4, the second port of the fourth Mach-Zehnder interferometer 6-4 is connected to the first port of the fourth photodetector 7-4, the second port of the fourth photodetector 7-4 is connected to the first port of the fourth radio frequency amplifier 8-4, and the second port of the fourth radio frequency amplifier 8-4 is connected to the third port of the fifth phase modulator 4-5; the second port of the fourth coupler 2-4 is connected to the first port of the subtractor 9, the third port of the subtractor 9 is connected to the first port of the fifth mach-zehnder interferometer 6-5, the second port of the fifth mach-zehnder interferometer 6-5 is connected to the first port of the fifth photodetector 7-5, and the second port of the fifth photodetector 7-5 outputs the recovered plaintext information.
In this embodiment, the chaotic signal is phase-modulated with 2PSK according to binary plaintext information to be transmitted, without any influence on the strength of the chaotic signal.
In this embodiment, the coupling coefficient of all couplers is 0.5.
The chaotic secret communication system based on the full-optical chaotic injection double-ring electro-optical phase chaotic disclosed in the embodiment has the following specific principle of a signal encryption and decryption method:
Firstly, at a transmitting end, optical signals sent out by a first semiconductor laser 1-1 and a second semiconductor laser 1-2 are fed back and coupled through a first part transparent reflector 3-1 and a second part transparent reflector 3-2 to generate two synchronous optical chaotic intensity signals, the two synchronous optical chaotic intensity signals are respectively fed into a first phase modulator 4-1 and a third phase modulator 4-3 through a first optical coupler 2-1 and a circulator 10, the first branch a and the second branch b form an electrooptical phase delay oscillation feedback loop of the transmitting end, a 2PSK modulation mode is adopted, the chaotic signals are subjected to phase modulation in a fourth phase modulator 4-4 through binary plaintext information, when the information is 1, the phase of the chaotic signals is inverted by 180 degrees, when the information is 0, one part of the encrypted signals sequentially passes through a second optical fiber delay line 5-2, a second Mach-Zehnder interferometer 6-2, a second photoelectric detector and a second radio frequency amplifier 8-2 to be transmitted to the first phase modulator 4-1 to form a phase delay oscillation feedback loop, and the other part of the electrooptical phase delay oscillation loop is transmitted to a receiving end through a receiving channel. In the process, binary plaintext information participates in the generation of the chaotic signal, the complexity of the chaotic signal is enhanced, and because the electrooptical phase delay oscillation feedback loop adopts an open loop structure, the system has stronger robustness, the phase modulation mode, the time delay of the adjustable optical fiber delay line and the time delay of the Mach-Zehnder interferometer further expand the key space, and the safety of the chaotic communication system is improved.
At the receiving end, the same principle as the transmitting end is adopted, a chaotic signal synchronous with the first branch a is generated through the third branch c, the phase of the chaotic signal is 180 degrees inverted by adopting a 2PSK modulation mode, the difference value operation is carried out on the chaotic signal through a subtracter 9 by demodulating the phase, and then the recovered plaintext information can be obtained through a fifth Mach-Zehnder interferometer 6-5 and a fifth photoelectric detector 7-5 with the same parameters, namely, when the difference value signal is 0, the plaintext information is 0, and when the difference value signal is 1, the plaintext information is 1.
The chaotic secret communication system based on the full-optical chaotic injection double-ring electro-optical phase chaotic realizes the communication process as follows:
1. Setting parameters, generating synchronous intensity chaotic signals through full light intensity feedback coupling, and cascading in an electro-optic phase delay oscillation feedback loop to further enhance the complexity of the chaotic signals.
2. The intensity chaotic signal enters an electro-optic phase delay oscillation feedback loop, generates time delay through a phase modulator, an adjustable optical fiber delay line and a Mach-Zehnder interferometer, becomes an electric signal through a photoelectric detector, is amplified and fed back to the phase modulator through a radio frequency amplifier, and carries out phase modulation on plaintext information in the feedback loop.
3. And the receiving end adopts the same structure as the transmitting end, performs difference value operation on the chaotic signal synchronized by the receiving end and the transmitting end and the chaotic signal carrying the plaintext information, and finally converts the chaotic signal into an electric signal through a photoelectric detector, and outputs the electric signal after judgment to obtain the transmitted plaintext information.
The foregoing is a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and those skilled in the art, based on the study idea provided by the present invention, will be able to modify the specific design, and these modifications should also be considered as the scope of the present invention.
Claims (10)
1. The chaotic secret communication system based on full-optical chaotic injection double-loop electro-optic phase chaotic comprises a transmitting end and a receiving end, and is characterized in that the transmitting end comprises a first branch (a) and a second branch (b), and the receiving end comprises a third branch (c) and a fourth branch (d);
The first optical signal emitted by the first semiconductor laser (1-1) of the first branch (a) is divided into two beams, namely a first beam of optical signal and a second beam of optical signal by a first optical coupler (2-1), and the first beam of optical signal sequentially passes through a first phase modulator (4-1), a second phase modulator (4-2), a first adjustable optical fiber delay line (5-1), a first Mach-Zehnder interferometer (6-1), a first photoelectric detector (7-1) and a first radio frequency amplifier (8-1) and then enters a third phase modulator (4-3) of the second branch (2);
The second optical signal sent by the second semiconductor laser (1-2) of the second branch (b) sequentially passes through the second partially transparent reflector (3-2) and the first circulator (10) and is divided into three beams of optical signals, namely a first beam of optical signal, a second beam of optical signal and a third beam of optical signal, wherein the first beam of optical signal is coupled with the second beam of optical signal formed by the first branch, the third beam of optical signal sequentially passes through the third phase modulator (4-3) and the fourth phase modulator (4-4) of the second branch and is divided into two beams by the second optical coupler (2-2), one beam is transmitted in a channel, and the other beam sequentially passes through the second adjustable optical fiber delay line (5-2), the second Mach-Zehnder interferometer (6-2), the second photoelectric detector (7-2) and the second radio frequency amplifier (8-2) and is transmitted to the first phase modulator (4-1) of the first branch;
The third optical signal emitted by the third semiconductor laser (1-3) of the third branch (c) is divided into two beams by the third optical coupler (2-3), and one beam is coupled with the second optical signal of the second branch through the third partial transparent reflector (3-3); the other beam sequentially passes through a fifth phase modulator (4-5), a sixth phase modulator (4-6), a third adjustable optical fiber delay line (5-3), a third Mach-Zehnder interferometer (6-3), a third photoelectric detector (7-3) and a third radio frequency amplifier (8-3) and then enters a subtracter (9) of a fourth branch;
the received signal of the fourth branch (d) is divided into two beams by a fourth optical coupler (2-4), and one beam of optical signal sequentially passes through a fourth adjustable optical fiber delay line (5-4), a fourth Mach-Zehnder interferometer (6-4), a fourth photoelectric detector (7-4) and a fourth radio frequency amplifier (8-4) and then enters a fifth phase modulator (4-5) of the third branch; the other beam of optical signals sequentially pass through a subtracter (9), a fifth Mach-Zehnder interferometer (6-5) and a fifth photoelectric detector (7-5).
2. The chaotic secret communication system based on full-optical chaotic injection double-loop electro-optic phase chaos according to claim 1, wherein parameters of the first radio frequency amplifier, the second radio frequency amplifier, the third radio frequency amplifier and the fourth radio frequency amplifier are the same.
3. The chaotic secret communication system based on full-optical chaotic injection double-ring electro-optical phase chaotic system according to claim 1, wherein parameters of the first semiconductor laser, the second semiconductor laser and the third semiconductor laser are the same.
4. The chaotic secret communication system based on full-optical chaotic injection double-loop electro-optic phase chaos according to claim 1, wherein the coupling coefficient of the first optical coupler, the second optical coupler, the third optical coupler and the fourth optical coupler is 0.5.
5. The chaotic secret communication system based on full-optical chaotic injection double-loop electro-optical phase chaos according to claim 1 or 2, wherein parameters of a first phase modulator, a second phase modulator, a third phase modulator, a fourth phase modulator, a fifth phase modulator and a sixth phase modulator are the same.
6. The chaotic secret communication system based on full-optical chaotic injection double-loop electro-optical phase chaos according to claim 1, wherein parameters of the first adjustable optical fiber delay line, the second adjustable optical fiber delay line, the third adjustable optical fiber delay line and the fourth adjustable optical fiber delay line are the same.
7. The chaotic secret communication system based on all-optical chaotic injection double-loop electro-optic phase chaos according to claim 1, wherein parameters of a first Mach-Zehnder interferometer, a second Mach-Zehnder interferometer, a third Mach-Zehnder interferometer, a fourth Mach-Zehnder interferometer and a fifth Mach-Zehnder interferometer are the same.
8. The chaotic secret communication system based on full-optical chaotic injection double-loop electro-optic phase chaos according to claim 1, wherein parameters of a first photoelectric detector, a second photoelectric detector, a third photoelectric detector, a fourth photoelectric detector and a fifth photoelectric detector are the same.
9. Chaotic secret communication method based on full-optical chaotic injection double-loop electro-optic phase chaos, and based on the system of any one of claims 1-8, the method is characterized by comprising the following specific steps:
At a transmitting end, optical signals emitted by a first semiconductor laser (1-1) and a second semiconductor laser (1-2) respectively pass through a first part transparent reflector (3-1) and a second part transparent reflector (3-2) to generate two synchronous optical chaotic intensity signals by feedback and coupling, and the two synchronous optical chaotic intensity signals are respectively injected into a first phase modulator (4-1) and a third phase modulator (4-3) through a first optical coupler (2-1) and a circulator (10); the first branch (a) and the second branch (b) form an electro-optic phase delay oscillation feedback loop of a transmitting end, a 2PSK modulation mode is adopted, a chaotic signal is subjected to phase modulation in a fourth phase modulator (4-4) through binary plaintext information, when the information is 1, the phase of the chaotic signal is turned 180 degrees, when the information is 0, the phase of the chaotic signal is not turned, one part of the encrypted signal sequentially passes through a second adjustable optical fiber delay line (5-2), a second Mach-Zehnder interferometer (6-2), a second photoelectric detector (7-2) and a second radio frequency amplifier (8-2) to be transmitted to the first phase modulator (4-1) to form the electro-optic phase delay oscillation feedback loop, and the other part of the encrypted signal is transmitted to a receiving end through a channel;
At a receiving end, a third path (c) generates a chaotic signal synchronous with the first branch (a), the phase of the chaotic signal is inverted 180 degrees by adopting a 2PSK modulation mode, the difference operation is carried out on the chaotic signal by a subtracter (9) through demodulation phase, and restored plaintext information is obtained through a fifth Mach-Zehnder interferometer (6-5) and a fifth photoelectric detector (7-5) with the same parameters, namely, the plaintext information is represented as 0 when the difference signal is 0 through judgment, and the plaintext information is represented as 1 when the difference signal is 1.
10. The chaotic secret communication method based on the all-optical chaotic injection double-loop electro-optic phase chaos according to claim 9, wherein the transmission rate of signals is set to 20Gbps.
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2024
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