CN112838921A - Chaos bidirectional safety communication system with multiple feedback and electro-optic phase oscillation - Google Patents
Chaos bidirectional safety communication system with multiple feedback and electro-optic phase oscillation Download PDFInfo
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- CN112838921A CN112838921A CN202011635012.3A CN202011635012A CN112838921A CN 112838921 A CN112838921 A CN 112838921A CN 202011635012 A CN202011635012 A CN 202011635012A CN 112838921 A CN112838921 A CN 112838921A
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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
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
- H04B10/85—Protection from unauthorised access, e.g. eavesdrop protection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
- H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
- H04B10/5561—Digital phase modulation
Abstract
The invention relates to a chaotic two-way safety communication system with multiple feedbacks and electro-optic phase oscillation, which comprises a sending end and a receiving end, wherein the sending end is connected with the receiving end through an optical fiber; the lasers at the transmitting end and the receiving end generate chaos under the action of phase conjugate feedback, electro-optic phase feedback and intensity feedback, an electro-optic oscillation circuit is driven to generate phase chaos, the electro-optic oscillation circuits at the transmitting end and the receiving end are coupled with each other and fed back to the lasers to enable the lasers at the two ends to be synchronous, the electro-optic oscillation circuit generates a completely synchronous chaos sequence with time delay hiding, the two ends realize encryption of digital signals by modulating bias current of the lasers, the two ends recover information difference by utilizing chaos synchronous errors, then the chaos synchronization error is operated with local signals, and finally decryption of the information is realized.
Description
Technical Field
The invention belongs to the technical field of information safety and information, and particularly relates to a chaotic two-way safety communication system with multiple feedback and electro-optic phase oscillation.
Background
The optical chaotic signal has the characteristics of a random signal, wide frequency band, strong interception resistance and high transmission rate, and the optical chaotic signal provides a choice for secret communication. The basis of chaotic communication is chaotic synchronization, and the safety of the chaotic communication is that an eavesdropper cannot reconstruct a chaotic signal, so related physical parameters such as time delay must be hidden to realize the safe chaotic communication.
Disclosure of Invention
Based on the above defects in the prior art, the invention provides a chaotic bidirectional secure communication system with multiple feedback and electro-optical phase oscillation. The invention is different from the traditional optical chaotic communication system in that chaos is generated by utilizing phase conjugate feedback, electro-optic phase feedback and intensity feedback, an electro-optic oscillation circuit is driven to generate phase chaos, a completely synchronous chaotic sequence with time delay hiding is generated at the receiving end and the transmitting end, the two ends realize the encryption of a digital signal by modulating laser bias current, the transmitting end and the receiving end recover the information difference by utilizing chaotic synchronization errors, and then perform differential operation with a local signal to realize the decryption of the information, which is the innovation of the invention.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
a chaotic bi-directional secure communication system with multiple feedback and electro-optic phase oscillations, comprising:
the transmitting end comprises a first phase conjugate mirror, a first phase modulator, a first beam splitter, a first chaotic laser, a second beam splitter, a first circulator, a second phase modulator, a first coupler and a second circulator which are sequentially connected; the first beam splitter is also connected to the first phase modulator sequentially through the first isolator, the first photoelectric detector and the first radio-frequency amplifier; the first coupler is also connected to the second phase modulator sequentially through a third phase modulator, a second Mach-Zehnder interferometer, a second photoelectric detector and a second radio-frequency amplifier to form a first electro-optical oscillation loop; the second circulator is also connected to a third phase modulator sequentially through the first Mach-Zehnder interferometer, the third photoelectric detector and the third radio frequency amplifier; the second beam splitter is also connected with a fourth photoelectric detector and a fifth photoelectric detector respectively;
the receiving end comprises a second phase conjugate mirror, a fourth phase modulator, a third beam splitter, a second chaotic laser, a fourth beam splitter, a third circulator, a fifth phase modulator, a second coupler and a fourth circulator which are sequentially connected; the third beam splitter is also connected to a fourth phase modulator sequentially through a second isolator, a sixth photoelectric detector and a fourth radio frequency amplifier; the second coupler is also connected to the fifth phase modulator sequentially through a sixth phase modulator, a fourth Mach-Zehnder interferometer, a seventh photoelectric detector and a fifth radio frequency amplifier to form a second electro-optical oscillation loop; the fourth circulator is also connected to a sixth phase modulator sequentially through a third Mach-Zehnder interferometer, an eighth photoelectric detector and a sixth radio frequency amplifier; the fourth beam splitter is also connected with a ninth photoelectric detector and a tenth photoelectric detector respectively;
the second circulator and the fourth circulator are connected through an optical fiber.
The structure of the sending end and the receiving end of the invention has symmetry, and realizes bidirectional communication.
And the demodulation of the information of the sending end sends the local chaotic signal to a fourth photoelectric detector through a second beam splitter, sends the received chaotic signal to a fifth photoelectric detector, subtracts the two electric signals, obtains an information difference after filtering, and then performs operation with the local signal to decrypt the transmitted information.
And the demodulation of the information of the receiving end sends the local chaotic signal to a ninth photoelectric detector through a fourth beam splitter, sends the received chaotic signal to a tenth photoelectric detector, subtracts the two electric signals, obtains an information difference after filtering, and then performs operation with the local signal to decrypt the transmitted information.
As a preferred scheme, the corresponding device parameters of the transmitting end and the receiving end are set to be the same.
Preferably, the feedback delay time of each phase conjugate mirror is 2.7 ns.
Preferably, the electro-optic phase feedback delay time of each chaotic laser is 2.4 ns.
Preferably, the bias current of each chaotic laser is 32 mA.
Preferably, the number of transparent carriers of each chaotic laser is 1.6633 multiplied by 108。
Preferably, the wavelength of the signal generated by each chaotic laser is 1550nm, and the power is 10 mW.
Preferably, the quantum efficiency of each photodetector is 10%.
Preferably, the time delay of each electro-optical tank is 3.67 ns.
Preferably, the gain of each rf amplifier is 10 dB.
Compared with the prior art, the invention has the beneficial effects that:
the invention utilizes phase conjugation feedback, electro-optic phase feedback and intensity feedback to generate chaos, then drives an electro-optic oscillation circuit to generate phase chaos, generates a completely synchronous chaos sequence with time delay hiding at the receiving and transmitting ends, the two ends realize the encryption of digital signals by modulating laser bias current, the transmitting end and the receiving end recover information difference by utilizing chaos synchronous error, and then carry out differential operation with local signals to realize the decryption of the information.
Drawings
FIG. 1 is a schematic diagram of a chaotic bi-directional secure communication system with multiple feedback and electro-optic phase oscillation according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an encrypted chaotic signal of a first chaotic laser according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an encrypted chaotic signal of a second chaotic laser according to an embodiment of the present invention;
FIGS. 4(a) and (b) are digital messages sent from both ends;
FIGS. 5(c) and (d) are diagrams for locally recovering information at the transmitting end;
1-2, a first phase conjugate mirror; 1-1. a second phase conjugate mirror; 2-1. a first phase modulator; 2-2. a second phase modulator; 2-3. a third phase modulator; 2-4. a fourth phase modulator; 2-5. a fifth phase modulator; 2-6. sixth phase modulator; 3-1. a first beam splitter; 3-2. a second beam splitter; 3-3. a third beam splitter; 3-4. a fourth beam splitter; 4-1. a first chaotic laser; 4-2. a second chaotic laser; 5-1. a first isolator; 5-2. a second isolator; 6-1. a first photodetector; 6-2. a second photodetector; 6-3. a third photodetector; 6-4. a fourth photodetector; 6-5. a fifth photodetector; 6-6. a sixth photodetector; 6-7, a seventh photodetector; 6-8, eighth photo detector; 6-9. ninth photodetector; 6-10, a tenth photodetector; 7-1. a first radio frequency amplifier; 7-2. a second radio frequency amplifier; 7-3. a third radio frequency amplifier; 7-4. a fourth radio frequency amplifier; 7-5. a fourth radio frequency amplifier; 7-6. a sixth radio frequency amplifier; 8-1. a first circulator; 8-2. a second circulator; 8-3. a third circulator; 8-4. a fourth circulator; 9-1. a first coupler; 9-2. a second coupler; 10-1. a first mach-zehnder interferometer; 10-2. a second mach-zehnder interferometer; 10-3. a third mach-zehnder interferometer; 10-4. a fourth mach-zehnder interferometer.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, the following description will explain the embodiments of the present invention with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
As shown in fig. 1, the chaotic bidirectional secure communication system with multiple feedback and electro-optical phase oscillation according to the embodiment of the present invention includes a first phase conjugate mirror 1-2, a second phase conjugate mirror 1-1, a first phase modulator 2-1, a second phase modulator 2-2, a third phase modulator 2-3, a fourth phase modulator 2-4, a fifth phase modulator 2-5, a sixth phase modulator 2-6, a first beam splitter 3-1, a second beam splitter 3-2, a third beam splitter 3-3, a fourth beam splitter 4-4, a first chaotic laser 4-1, a second chaotic laser 4-2, a first isolator 5-1, a second isolator 5-2, a first photo detector 6-1, a second photo detector 6-2, a third photodetector 6-3, a fourth photodetector 6-4, a fifth photodetector 6-5, a sixth photodetector 6-6, a seventh photodetector 6-7, an eighth photodetector 6-8, a ninth photodetector 6-9, a tenth photodetector 6-10, a first radio frequency amplifier 7-1, a second radio frequency amplifier 7-2, a third radio frequency amplifier 7-3, a fourth radio frequency amplifier 7-4, a fourth radio frequency amplifier 7-5, a sixth radio frequency amplifier 7-6, a first circulator 8-1, a second circulator 8-2, a third circulator 8-3, a fourth circulator 8-4, a first coupler 9-1, a second coupler 9-2, a first Mach-Zehnder interferometer 10-1, a second mach-zehnder interferometer 10-2, a third mach-zehnder interferometer 10-3, and a fourth mach-zehnder interferometer 10-4.
The chaotic bidirectional secure communication system provided by the embodiment of the invention generates chaos by utilizing phase conjugate feedback, electro-optic phase feedback and intensity feedback, then drives an electro-optic oscillation circuit to generate phase chaos, generates a completely synchronous chaotic sequence with time delay hiding at the receiving and transmitting ends, realizes encryption of digital signals by modulating laser bias current at the two ends, recovers information difference by utilizing chaotic synchronization error at the transmitting end and the receiving end, and then performs differential operation with local signals to realize decryption of information.
The specific connection relationship of the above devices of the chaotic bidirectional secure communication system of the embodiment of the invention is as follows:
a first phase conjugate mirror 1-2 port a1 at a transmitting end is connected with a first phase modulator 2-1 port b1, a first phase modulator 2-1 port b2 is connected with a first beam splitter 3-1 port c1, a first beam splitter 3-1 port c2 is connected with a first chaotic laser 4-1 port d1, a first beam splitter 3-1 port c3 is connected with a first isolator 5-1 port e1, a first isolator 5-1 port e2 is connected with a first photoelectric detector 6-1 port f1, a first photoelectric detector 6-1 port f2 is connected with a first radio frequency amplifier 7-1 port g1, a first radio frequency amplifier 7-1 port g2 is connected with a first phase modulator 2-1 port b3, a first chaotic laser 4-1 port d2 is connected with a second beam splitter 3-2 port c7, the second beam splitter 3-2 port c8 is connected with the first circulator 8-1 port h1, the first circulator 8-1 port h2 is connected with the second phase modulator 2-2 port b4, the second phase modulator 2-2 port b5 is connected with the first coupler 9-1 port j1, the first coupler 9-1 port j2 is connected with the third phase modulation 2-3 port b7, the third phase modulator 2-3 port b8 is connected with the second mach-zehnder interferometer 10-2 port i1, the second mach-zehnder interferometer 10-2 port i2 is connected with the second photo-detector 6-2 port f3, the second photo-detector 6-2 port f4 is connected with the second radio frequency amplifier 7-2 port g3, the second radio frequency amplifier 7-2 port g4 is connected with the second phase modulator 2-2 port b6, the first coupler 9-1 port j4 is connected with the first circulator 8-1 port h3, the first coupler 9-1 port j3 is connected with the second circulator 8-2 port h6, the second circulator 8-2 port h4 is connected with the first mach-zehnder interferometer 10-1 port i3, the first mach-zehnder interferometer 10-1 port i4 is connected with the third photodetector 6-3 port f5, the third photodetector 6-3 port f6 is connected with the third radio-frequency amplifier 7-3 port g5, and the third radio-frequency amplifier 7-3 port g6 is connected with the third phase modulator 2-3 port b 9.
The port h5 of the second circulator 8-2 is connected to the port h11 of the fourth circulator 8-4 through an optical fiber link to reach the receiving end, so that the transmitting end and the receiving end are connected through an optical fiber;
a second phase conjugate mirror 1-1 port a2 at the receiving end is connected with a fourth phase modulator 2-4 port b10, a fourth phase modulator 2-4 port b11 is connected with a third beam splitter 3-3 port c4, a third beam splitter 3-3 port c5 is connected with a second chaotic laser 4-2 port d3, a third beam splitter 3-3 port c6 is connected with a second isolator 5-2 port e3, a second isolator 5-2 port e4 is connected with a sixth photoelectric detector 6-6 port f7, a sixth photoelectric detector 6-6 port f8 is connected with a fourth radio frequency amplifier 7-4 port g7, a fourth radio frequency amplifier 7-4 port 35g 8 is connected with a fourth phase modulator 2-4 port b12, a second chaotic laser 4-2 port d4 is connected with a fourth beam splitter 3-4 port c11, the fourth beam splitter 3-4 port c12 is connected with the third circulator 8-3 port h7, the third circulator 8-3 port h8 is connected with the fifth phase modulator 2-5 port b13, the fifth phase modulator 2-5 port b14 is connected with the second coupler 9-2 port j5, the second coupler 9-2 port j6 is connected with the sixth phase modulator 2-6 port b16, the sixth phase modulator 2-6 port b17 is connected with the fourth mach-zehnder interferometer 10-4 port i5, the fourth mach-zehnder interferometer 10-4 port i6 is connected with the seventh photoelectric detector 6-7 port f9, the seventh photoelectric detector 6-7 port f10 is connected with the fifth radio frequency amplifier 7-5 port g9, the fifth radio frequency amplifier 7-5 port g10 is connected with the fifth phase modulator 2-5 port b15, the second coupler 9-2 port j8 is connected with the third circulator 8-3 port h9, the second coupler 9-2 port j7 is connected with the fourth circulator 8-4 port h12, the fourth circulator 8-4 port h10 is connected with the third mach-zehnder interferometer 10-3 port i7, the third mach-zehnder interferometer 10-3 port i8 is connected with the eighth photoelectric detector 6-8 port f11, the eighth photoelectric detector 6-8 port f12 is connected with the sixth radio frequency amplifier 7-6 port g11, and the sixth radio frequency amplifier 7-6 port g12 is connected with the sixth phase modulator 2-6 port b 18.
The demodulation of the information of the sending end sends the local chaotic signal to a fourth photoelectric detector 6-4 through a second beam splitter 3-2, sends the chaotic signal sent and received by the opposite side to a fifth photoelectric detector 6-5, subtracts the two electric signals, obtains an information difference after filtering, and then carries out operation with the local signal to decrypt the transmitted information. The demodulation of the receiving end information sends the local chaotic signal to a ninth photoelectric detector 6-9 through a fourth beam splitter 3-4, the chaotic signal sent by the opposite side is sent to a tenth photoelectric detector 6-10, the two electric signals are subtracted and filtered to obtain an information difference, and then the information difference is calculated with the local signal to decrypt the transmitted information. And finally realizing bidirectional communication.
As shown in FIG. 1, an original chaotic light signal output by a first chaotic laser 4-1 in a sending end passes through a first beam splitter 3-1 and is divided into two beams, one beam passes through a first phase modulator 2-1 and reaches a first phase conjugate mirror 1-1, the other beam passes through a first isolator 5-1 and is converted into an electric signal by a first photoelectric detector 6-1, the electric signal is amplified by a first radio frequency amplifier 7-1, the reflected light of the first phase conjugate mirror 1-1 is subjected to phase modulation by a first phase modulator 2-1, the optical signal is fed back to the first laser 4-1, the chaotic light signal output by the first chaotic laser 4-1 passes through a second beam splitter 3-2 and a first circulator 8-1 and enters a second phase modulation 2-2 and is divided into three paths by a first coupler 9-1, the first path is fed back to the first laser 4-1 through the first circulator 8-1, and the second path output by the first coupler 9-1 is sent to the fourth circulator 8-4 at the receiving end through the second circulator 8-2 by using an optical fiber link; the third path output by the first coupler 9-1 passes through a third phase modulator 2-3 and a second Mach-Zehnder interferometer 10-2, is converted into an electric signal by a second photoelectric detector 6-2, is amplified by a second radio frequency amplifier 7-2, and then carries out phase modulation on the optical signal passing through the second phase modulator to generate electro-optic phase oscillation.
At a receiving end, an original chaotic light signal output by a second chaotic laser 4-2 is divided into two beams by a third beam splitter 3-3, one beam passes through a fourth phase modulator 2-4 and reaches a second phase conjugate mirror 1-2, the other beam passes through a second isolator 5-2, is changed into an electric signal by a sixth photoelectric detector 6-6, is amplified by a fourth radio frequency amplifier 7-4, then utilizes a fourth phase modulator 2-4 to perform phase modulation on reflected light of the second phase conjugate mirror 1-2, the optical signal is fed back to the second laser 4-2, the chaotic light signal output by the second chaotic laser 4-2 passes through the fourth beam splitter 3-4 and a third circulator 8-3 and enters a fifth phase modulation 2-5, and then is divided into three paths by a second coupler 9-2, the first path is fed back to the second laser 4-2 through the third circulator 8-3, and the second path output by the second coupler 9-2 is sent to the second circulator 8-2 at the transmitting end through the fourth circulator 8-4 by using an optical fiber link; the third path output by the second coupler 9-2 passes through a sixth phase modulator 2-6 and a fourth Mach-Zehnder interferometer 10-4, is converted into an electric signal by a seventh photoelectric detector 6-7, is amplified by a fifth radio frequency amplifier 7-5, and then carries out phase modulation on the optical signal passing through the fifth phase modulator to generate electro-optic phase oscillation. Therefore, the delay time parameters of the bidirectional chaotic optical signals transmitted in the optical fiber are all hidden, and secret communication can be realized.
The chaotic bidirectional secure communication system of the invention carries out chaotic encryption and decryption communication on transmission signals by the following methods:
generating chaos by utilizing phase conjugate feedback, electro-optic phase feedback and intensity feedback, driving an electro-optic oscillation circuit to generate phase chaos, generating a completely synchronous chaotic sequence with time delay hiding at the receiving and transmitting ends, realizing encryption of a digital signal by modulating bias current of a laser at the two ends, recovering an information difference by utilizing chaotic synchronization errors at the transmitting end and the receiving end, and then carrying out differential operation with a local signal to realize decryption of the information; on the contrary, when the transmission bits are "0" and "1", respectively, the synchronization of the transmitting end and the receiving end is broken. Therefore, the sending end and the receiving end can recover the information difference by using the chaotic synchronization error, and then operate with the local signal, and finally realize the decryption of the information.
As shown in fig. 2 and 3, after the information modulates the lasers of both communication parties, the information is successfully hidden in the chaotic sequence.
The decoding process starts from detecting the optical power of the transmitting end and the local, the information difference can be recovered by subtracting the signals detected by the photoelectric detector, and the transmitted information can be recovered by calculating the information difference and the local signal.
As shown in fig. 4 and 5, the digital information sent by both ends is kept consistent, and the information of the local recovery sending end is also kept consistent, so that bidirectional communication is realized.
Wherein, the feedback delay time of the two phase conjugate mirrors in the embodiment of the invention is 2.7 ns; the electro-optic phase feedback delay time of the two chaotic lasers is 2.4 ns; the time delay of the two electro-optical oscillation loops is 3.67 ns; the bias current of the two chaotic lasers is 32 mA; transparent carrier number 1.6633 multiplied by 10 of two chaotic lasers8(ii) a The signal wavelength generated by the two chaotic lasers is 1550nm, and the power is 10 mW; the quantum efficiency of each photodetector is 0.1 and the gain of each rf amplifier is 10 dB.
The chaotic two-way safety communication system of the invention has the following brief summary of the communication process:
1. the two ends generate chaos by utilizing phase conjugate feedback, electro-optic phase feedback and intensity feedback of the laser.
2. And respectively driving the electro-optical oscillation circuits to generate phase chaos. And then generates a synchronization signal at both the transmitting and receiving ends.
3. After chaos synchronization, the information at two ends respectively modulates the bias current of the laser to realize information encryption;
4. and photoelectric detectors are used at two ends to respectively detect the chaotic sequence transmitted by the opposite side and the local chaotic sequence.
5. And subtracting the two electric signals to recover the information difference.
6. And calculating the information difference and the local information, and finally recovering the information of the sending end.
The invention realizes chaotic bidirectional communication by using common optical devices, and has the characteristics of low cost, stable performance, low error rate, strong confidentiality and the like.
While the preferred embodiments and principles of this invention have been described in detail, it will be apparent to those skilled in the art that variations may be made in the embodiments based on the teachings of the invention and such variations are considered to be within the scope of the invention.
Claims (10)
1. A chaotic bi-directional secure communication system with multi-feedback and electro-optic phase oscillation, comprising:
the transmitting end comprises a first phase conjugate mirror, a first phase modulator, a first beam splitter, a first chaotic laser, a second beam splitter, a first circulator, a second phase modulator, a first coupler and a second circulator which are sequentially connected; the first beam splitter is also connected to the first phase modulator sequentially through the first isolator, the first photoelectric detector and the first radio-frequency amplifier; the first coupler is also connected to the second phase modulator sequentially through a third phase modulator, a second Mach-Zehnder interferometer, a second photoelectric detector and a second radio-frequency amplifier to form a first electro-optical oscillation loop; the second circulator is also connected to a third phase modulator sequentially through the first Mach-Zehnder interferometer, the third photoelectric detector and the third radio frequency amplifier; the second beam splitter is also connected with a fourth photoelectric detector and a fifth photoelectric detector respectively;
the receiving end comprises a second phase conjugate mirror, a fourth phase modulator, a third beam splitter, a second chaotic laser, a fourth beam splitter, a third circulator, a fifth phase modulator, a second coupler and a fourth circulator which are sequentially connected; the third beam splitter is also connected to a fourth phase modulator sequentially through a second isolator, a sixth photoelectric detector and a fourth radio frequency amplifier; the second coupler is also connected to the fifth phase modulator sequentially through a sixth phase modulator, a fourth Mach-Zehnder interferometer, a seventh photoelectric detector and a fifth radio frequency amplifier to form a second electro-optical oscillation loop; the fourth circulator is also connected to a sixth phase modulator sequentially through a third Mach-Zehnder interferometer, an eighth photoelectric detector and a sixth radio frequency amplifier; the fourth beam splitter is also connected with a ninth photoelectric detector and a tenth photoelectric detector respectively;
the second circulator and the fourth circulator are connected through an optical fiber.
2. The chaotic bi-directional secure communication system with multi-feedback and electro-optical phase oscillation according to claim 1, wherein the corresponding device parameters of the transmitting end and the receiving end are set to be the same.
3. The chaotic bi-directional secure communication system with multi-feedback and electro-optic phase oscillations according to claim 1, wherein the feedback delay time of each phase conjugate mirror is 2.7 ns.
4. The chaotic bi-directional secure communication system with multi-feedback and electro-optic phase oscillation according to claim 1, wherein the electro-optic phase feedback delay time of each chaotic laser is 2.4 ns.
5. The chaotic bi-directional secure communication system with multi-feedback and electro-optic phase oscillation according to claim 1, wherein the bias current of each chaotic laser is 32 mA.
6. The chaotic bi-directional secure communication system with multi-feedback and electro-optic phase oscillation as claimed in claim 1, wherein each chaotic laser has a transparent carrier count of 1.6633 x 108。
7. The chaotic bi-directional secure communication system with multi-feedback and electro-optic phase oscillation according to claim 1, wherein each chaotic laser generates a signal with a wavelength of 1550nm and a power of 10 mW.
8. The chaotic bi-directional secure communication system with multi-feedback and electro-optic phase oscillations according to claim 1, wherein the quantum efficiency of each photodetector is 10%.
9. The chaotic bi-directional secure communication system with multi-feedback and electro-optic phase oscillation of claim 1, wherein the time delay of each electro-optic oscillation loop is 3.67 ns.
10. The chaotic bi-directional secure communication system with multi-feedback and electro-optic phase oscillations according to claim 1, wherein the gain of each rf amplifier is 10 dB.
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| CN113612544A (en) * | 2021-07-13 | 2021-11-05 | 杭州电子科技大学 | Optical chaotic secret communication system with four-dimensional key space |
| CN114337832A (en) * | 2021-12-22 | 2022-04-12 | 杭州电子科技大学 | Chaos coding based keying optical chaos communication system |
| CN115225247A (en) * | 2022-07-11 | 2022-10-21 | 北京邮电大学 | Phase modulation loopback time synchronization device, method and system |
| CN116192261A (en) * | 2023-01-12 | 2023-05-30 | 西南交通大学 | Long-distance laser chaotic synchronization system based on optical phase conjugation |
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| CN113612544A (en) * | 2021-07-13 | 2021-11-05 | 杭州电子科技大学 | Optical chaotic secret communication system with four-dimensional key space |
| CN114337832A (en) * | 2021-12-22 | 2022-04-12 | 杭州电子科技大学 | Chaos coding based keying optical chaos communication system |
| CN114337832B (en) * | 2021-12-22 | 2024-02-09 | 杭州电子科技大学 | Key control optical chaos communication system based on chaos coding |
| CN115225247A (en) * | 2022-07-11 | 2022-10-21 | 北京邮电大学 | Phase modulation loopback time synchronization device, method and system |
| CN115225247B (en) * | 2022-07-11 | 2023-12-01 | 北京邮电大学 | Phase modulation loop-back time synchronization device, method and system |
| CN116192261A (en) * | 2023-01-12 | 2023-05-30 | 西南交通大学 | Long-distance laser chaotic synchronization system based on optical phase conjugation |
| CN116192261B (en) * | 2023-01-12 | 2024-03-01 | 西南交通大学 | Long-distance laser chaotic synchronization system based on optical phase conjugation |
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