CN112865951B - Electro-optical phase mutual coupling bidirectional chaotic communication system - Google Patents
Electro-optical phase mutual coupling bidirectional chaotic communication system Download PDFInfo
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- 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
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- H04B10/5161—Combination of different modulation schemes
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- H—ELECTRICITY
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- 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
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- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/67—Optical arrangements in the receiver
- H04B10/676—Optical arrangements in the receiver for all-optical demodulation of the input optical signal
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Abstract
The invention relates to an electro-optical phase mutual coupling bidirectional chaotic communication system, which comprises: the optical fiber coupling device comprises a transmitting end and a receiving end which are connected through an optical fiber, wherein the transmitting end comprises a first chaotic laser, a first beam splitter, a first circulator, a first coupler, a first Mach-Zehnder interferometer, a first photoelectric detector, a first electric amplifier and a first phase modulator which are connected in sequence; the first chaotic laser, the first circulator, the first Mach-Zehnder interferometer, the first photoelectric detector and the first electric amplifier are connected in sequence; the receiving end and the transmitting end have the same structure. The method not only realizes the chaos time delay hiding of the chaos synchronous communication, but also has the characteristics of stable performance, strong confidentiality and the like.
Description
Technical Field
The invention belongs to the technical field of secret communication and information security, and particularly relates to an electro-optical phase mutual coupling bidirectional chaotic communication system.
Background
The optical chaotic communication is based on chaotic synchronization, and the premise is that parameters of a transmitting end and a receiving end are matched, and internal parameters of a laser can be guessed by an eavesdropper. Because the internal parameters of the laser vary little, but if the feedback delay is hidden, it is difficult to reconstruct the chaotic dynamics. In order to ensure the safety of communication, a signal to be transmitted is modulated into an optical chaotic signal, and the received chaotic signal and a local chaotic signal are subtracted at a receiving end by utilizing the robustness of the chaotic signal, so that the signal can be demodulated.
Therefore, it is necessary to hide the feedback time delay parameter and provide a new scheme for time-delay hidden bidirectional secure communication.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an electro-optical phase mutual coupling bidirectional chaotic communication system. The invention is characterized in that two chaotic lasers are utilized at the transmitting end and the receiving end to generate intensity chaos, two optical chaotic signals are converted into two electric signals through photoelectric conversion, the two electric signals are input into the same Mach Zehnder modulator, one optical signal is subjected to phase modulation and then is coupled into the two lasers of the opposite side, so that a time delay signature is hidden and is synchronous with the opposite laser, and the two ends of a link are a receiving end and a transmitting end. After synchronization, the encryption of signals is realized by modulating bias currents of lasers at two ends, synchronous errors of the signals are detected at the two ends of the receiving and transmitting ends to decrypt information difference, and then the information difference is calculated with local information, so that the decryption of the information can be realized, and further, the safe communication is carried out.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
an electro-optical phase mutual coupling bidirectional chaotic communication system, comprising:
the transmitting end comprises a first chaotic laser, a first beam splitter, a first circulator, a first coupler, a first Mach-Zehnder interferometer, a first photoelectric detector, a first electric amplifier and a first phase modulator which are sequentially connected; the first chaotic laser, the first circulator, the first Mach-Zehnder interferometer, the first photoelectric detector and the first electric amplifier are connected in sequence;
the receiving end comprises a third chaotic laser, a second beam splitter, a fifth circulator, a third coupler, a third Mach-Zehnder interferometer, a third photoelectric detector, a third electric amplifier and a second phase modulator which are sequentially connected, and further comprises a fourth chaotic laser, a sixth circulator, a fourth Mach-Zehnder interferometer, a fourth photoelectric detector and a fourth electric amplifier which are sequentially connected, wherein the fourth electric amplifier is connected with the second phase modulator, the fifth circulator and the sixth circulator are both connected with the fourth coupler, and the fourth coupler and the second phase modulator are both connected with the fourth circulator;
the third circulator is connected with the fourth circulator through an optical fiber;
the first beam splitter is respectively connected with the fifth photoelectric detector and the sixth photoelectric detector, and the second beam splitter is respectively connected with the seventh photoelectric detector and the eighth photoelectric detector.
As a preferred scheme, the chaotic optical signal output by the first chaotic laser is sequentially divided into two paths after passing through the first beam splitter, the first circulator and the first coupler, one path enters the first phase modulator, the other path enters the first mach-zehnder interferometer, the first photodetector and the first electrical amplifier in sequence, the optical signal entering the first phase modulator is subjected to phase modulation after being amplified, and the generated additional phase is x1；
The chaotic light signal output by the second chaotic laser sequentially passes through the second circulator, enters the second Mach-Zehnder interferometer, the second photoelectric detector and the second electric amplifier, and is amplified to perform phase modulation on the light signal entering the first phase modulator, and the generated additional phase is x2；
The additional phase of the output signal of the first phase modulator is x1-x2The output signal of the first phase modulator enters a third circulator, is accessed into a fourth circulator through an optical fiber and then enters a fourth coupler, and is divided into two paths, wherein one path is coupled to a third chaotic laser through a fifth circulator and a second beam splitter; in additionOne path is coupled to the fourth chaotic laser through a sixth circulator.
As a preferred scheme, the chaotic optical signal output by the third chaotic laser sequentially passes through the second beam splitter, the fifth circulator and the third coupler and then is divided into two paths, one path enters the second phase modulator, the other path sequentially enters the third mach-zehnder interferometer, the third photodetector and the third electrical amplifier, the optical signal entering the second phase modulator is subjected to phase modulation after being amplified, and the generated additional phase is x3；
The chaotic optical signal output by the fourth chaotic laser sequentially passes through a sixth circulator, a fourth Mach-Zehnder interferometer, a fourth photoelectric detector and a fourth electric amplifier, the optical signal entering the second phase modulator is subjected to phase modulation after being amplified, and the generated additional phase is x4；
The additional phase of the second phase modulator output signal being x3-x4The output signal of the second phase modulator enters a fourth circulator, is accessed into a third circulator through an optical fiber and then enters a second coupler to be divided into two paths, one path is coupled to the first chaotic laser through the first circulator and the first beam splitter, and the other path is coupled to the second chaotic laser through the second circulator;
and a synchronous chaotic signal is generated between the first chaotic laser and the third chaotic laser.
As a preferred scheme, after synchronization, information is used for modulating bias currents of a first chaotic laser and a third chaotic laser at two ends of a link to realize encryption, based on the robustness of chaotic synchronization, one end of the chaotic synchronization modulator utilizes a fifth photoelectric detector and a sixth photoelectric detector to detect a transmitted signal separated by a first beam splitter and a local optical chaotic signal, then a synchronous error is obtained by subtraction, an information difference is recovered after filtering, and then the chaotic synchronization modulator and the local optical chaotic modulator are operated to recover the transmitted information; and the other end of the optical fiber detects the transmitted and local optical chaotic signals separated by the second beam splitter by using a seventh photoelectric detector and an eighth photoelectric detector, then subtracts the signals to obtain a synchronous error, recovers an information difference after filtering, and then performs operation on the information difference and a local signal to recover the transmitted information.
Preferably, the external cavity feedback delay time of the first chaotic laser and the third chaotic laser is 2.97 ns.
Preferably, the external cavity feedback delay time of the second chaotic laser and the fourth chaotic laser is 2.77 ns.
As a preferred scheme, the coupling delay between the chaotic lasers for communication at the two ends of the link is 6.8 ns.
Preferably, the bias current of the first chaotic laser and the third chaotic laser is 32 mA.
Preferably, the bias current of the second chaotic laser and the bias current of the fourth chaotic laser are 30 mA.
Preferably, the first chaotic laser, the second chaotic laser, the third chaotic laser and the fourth chaotic laser generate signals with a wavelength of 1550nm and power of 10 mW.
The signal transmission principle of the invention is as follows: the chaotic light signal output by the first chaotic laser enters the first coupler through the first beam splitter and the first circulator and then is divided into two paths, one path enters the first phase modulator, the other path enters the first Mach-Zehnder interferometer and then enters the first photoelectric detector and the first electric amplifier, the optical signal entering the first phase modulator is subjected to phase modulation after being amplified, and the generated additional phase is x1(ii) a The chaotic light signal output by the second chaotic laser enters a second Mach-Zehnder interferometer through a second circulator, then enters a second photoelectric detector and a second electric amplifier, the optical signal entering the first phase modulator is subjected to phase modulation after being amplified, and the generated additional phase is x2So that the additional phase of the output signal of the first phase modulator is x1-x2. The output signal of the first phase modulator enters a third circulator, is accessed into a fourth circulator through an optical fiber and then enters a fourth coupler, and is divided into two paths, wherein one path is coupled to a third chaotic laser through a fifth circulator and a second beam splitter; the other path is coupled to a fourth chaotic laser through a sixth circulator.
Third chaotic laser at the other end of the linkThe output chaotic light signal enters a third coupler through a second beam splitter and a fifth circulator and then is divided into two paths, one path enters a second phase modulator, the other path enters a third Mach-Zehnder interferometer and then enters a third photoelectric detector and a third electric amplifier, the optical signal entering the second phase modulator is subjected to phase modulation after being amplified, and the generated additional phase is x3(ii) a The chaotic light signal output by the fourth chaotic laser enters a fourth Mach-Zehnder interferometer through a sixth circulator, then enters a fourth photoelectric detector and a fourth electric amplifier, the optical signal entering a second phase modulator is subjected to phase modulation after being amplified, and the generated additional phase is x4So that the additional phase of the second phase modulator output signal is x3-x4. The output signal of the second phase modulator enters a fourth circulator, is accessed into a third circulator through an optical fiber and then enters a second coupler, and is divided into two paths, wherein one path is coupled to the first chaotic laser through the first circulator and the first beam splitter; the other path is coupled to the second chaotic laser through a second circulator.
And finally, coupling between the lasers at the two ends is realized, and a synchronous chaotic signal is generated between the first chaotic laser and the third chaotic laser.
And after synchronization, the information is used for modulating bias currents of a first chaotic laser and a third chaotic laser at two ends of a link to realize encryption, based on the robustness of chaotic synchronization, a fifth photoelectric detector and a sixth photoelectric detector are used at one end for detecting the separated transmission of the first beam splitter and a local optical chaotic signal, then subtraction is carried out to obtain a synchronization error, the information difference can be recovered after filtering, and then the transmitted information can be recovered by operating with the local signal. And the other end of the optical fiber detects the transmitted and local optical chaotic signals separated by the second beam splitter by using a seventh photoelectric detector and an eighth photoelectric detector, then the synchronous error is obtained by subtracting the signals, the information difference can be recovered after filtering, and the transmitted information can also be recovered by operating the optical chaotic optical fiber with the local signals.
Compared with the prior art, the invention has the beneficial effects that:
according to the electro-optical phase intercoupling bidirectional chaotic communication system, due to the fact that the two laser time sequences at the two ends of the link are not correlated, the two irrelevant chaotic phases are overlapped by the phase modulator to generate feedback scrambling and are coupled to the two lasers at the other end, the time delay signature is hidden, chaotic time delay hiding of chaotic synchronous communication is achieved, and the system has the advantages of being stable in performance, strong in confidentiality and the like.
Drawings
FIG. 1 is a frame diagram of an electro-optical phase mutual coupling bidirectional chaotic communication system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a chaotic signal output by a chaotic laser at a transmitting end after being modulated by a signal according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a chaotic signal output by a receiving end chaotic laser according to an embodiment of the present invention;
fig. 4 is schematic diagrams (a) and (b) of binary signals transmitted by a transmitting end and schematic diagrams (c) and (d) of binary signals recovered by a receiving end according to an embodiment of the present invention;
wherein: 1-1, 1-2, 1-3 and 1-4 respectively represent a first chaotic laser, a second chaotic laser, a third chaotic laser and a fourth chaotic laser; 2-1, 2-2, 2-3, 2-4, 2-5 and 2-6 are a first circulator, a second circulator, a third circulator, a fourth circulator, a fifth circulator and a sixth circulator; 3-1, 3-2, 3-3 and 3-4 are first, second and third and fourth couplers, respectively; 4-1, 4-2 and 4-3, 4-4 are the first, second and third, fourth mach-zehnder interferometers, respectively; 5-1, 5-2, 5-3, 5-4, 5-5, 5-6, 5-7 and 5-8 are first, second, third and fourth, fifth, sixth and seventh and eighth photodetectors; 6-1, 6-2 and 6-3, 6-4 are the first, second and third, fourth electrical amplifiers, respectively; 7-1 and 7-2 denote first and second phase modulators, respectively; 8-1 and 8-2 are a first beam splitter and a second beam splitter.
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.
The electro-optical phase mutual coupling bidirectional chaotic communication system comprises a sending end and a receiving end, wherein the sending end and the receiving end are connected through an optical fiber.
Specifically, the transmitting end comprises a first chaotic laser, a first beam splitter, a first circulator, a first coupler, a first Mach-Zehnder interferometer, a first photoelectric detector, a first electric amplifier, a second chaotic laser, a second circulator, a second Mach-Zehnder interferometer, a second photoelectric detector, a second electric amplifier, a first phase modulator, a second coupler and a third circulator.
The receiving end comprises a third chaotic laser, a fourth circulator, a third coupler, a third Mach-Zehnder interferometer, a third photoelectric detector, a third electric amplifier, a fourth chaotic laser, a fifth circulator, a fourth Mach-Zehnder interferometer, a fourth photoelectric detector, a fourth electric amplifier, a second phase modulator, a fourth coupler and a sixth circulator.
The third circulator and the fourth circulator are connected through an optical fiber.
The two-way chaotic communication system with mutually coupled electro-optical phases, provided by the embodiment of the invention, divides a chaotic optical signal output by a first chaotic laser into two paths after entering a first coupler through a first beam splitter and a first circulator, wherein one path of the chaotic optical signal enters a first phase modulator, the other path of the chaotic optical signal enters a first Mach-Zehnder interferometer, then the chaotic optical signal enters a first photoelectric detector and a first electric amplifier, the chaotic optical signal is subjected to phase modulation after being amplified, and the generated additional phase is x1(ii) a The chaotic light signal output by the second chaotic laser enters a second Mach-Zehnder interferometer through a second circulator, then enters a second photoelectric detector and a second electric amplifier, the optical signal entering the first phase modulator is subjected to phase modulation after being amplified, and the generated additional phase is x2So that the additional phase of the output signal of the first phase modulator is x1-x2. The first phase modulator output signal enters the third ringThe device is connected with a fourth circulator at a receiving end through an optical fiber, then enters a fourth coupler and is divided into two paths, and one path is coupled to a third chaotic laser through a fifth circulator and a second beam splitter; the other path is coupled to a fourth chaotic laser through a sixth circulator.
The chaotic light signal output by the third chaotic laser at the other end of the link enters the third coupler through the second beam splitter and the fifth circulator and then is divided into two paths, one path enters the second phase modulator, the other path enters the third Mach-Zehnder interferometer and then enters the third photoelectric detector and the third electric amplifier, the optical signal entering the second phase modulator is subjected to phase modulation after being amplified, and the generated additional phase is x3(ii) a The chaotic light signal output by the fourth chaotic laser enters a fourth Mach-Zehnder interferometer through a sixth circulator, then enters a fourth photoelectric detector and a fourth electric amplifier, the optical signal entering a second phase modulator is subjected to phase modulation after being amplified, and the generated additional phase is x4So that the additional phase of the second phase modulator output signal is x3-x4. The output signal of the second phase modulator enters a fourth circulator, is accessed into a third circulator through an optical fiber and then enters a second coupler, and is divided into two paths, wherein one path is coupled to the first chaotic laser through the first circulator and the first beam splitter; the other path is coupled to a second chaotic laser through a second circulator. And finally, coupling between the lasers at the two ends is realized, and a synchronous chaotic signal is generated between the first chaotic laser and the third chaotic laser.
After synchronization, information is used for modulating bias currents of a first chaotic laser and a third chaotic laser at two ends of a link to realize encryption, based on robustness of chaotic synchronization, one end of the chaotic synchronous circuit detects a transmitted signal separated by a first beam splitter and a local optical chaotic signal by a fifth photoelectric detector and a sixth photoelectric detector, then a synchronous error is obtained by subtraction, an information difference can be recovered after filtering, and the transmitted information can be recovered by operation with the local signal. And the other end of the optical fiber detects the transmitted and local optical chaotic signals separated by the second beam splitter by using a seventh photoelectric detector and an eighth photoelectric detector, then the synchronous error is obtained by subtracting the signals, the information difference can be recovered after filtering, and the transmitted information can also be recovered by operating the optical chaotic optical fiber with the local signals.
As shown in fig. 1, the specific connection relationship of the above devices of the bidirectional chaotic communication system is as follows:
the transmitting end comprises a first chaotic laser 1-1, a first beam splitter 8-1, a first circulator 2-1, a first coupler 3-1, a first Mach-Zehnder interferometer 4-1, a first photoelectric detector 5-1, a first electric amplifier 6-1, a second chaotic laser 1-2, a second circulator 2-2, a second Mach-Zehnder interferometer 4-2, a second photoelectric detector 5-2, a second electric amplifier 6-2, a first phase modulator 7-1, a second coupler 3-2 and a third circulator 2-3. Specifically, the a1 port of the first chaotic laser 1-1 in the transmitting end is connected to the i1 port of the first beam splitter 8-1, the i2 port of the first beam splitter 8-1 is connected to the b1 port of the first circulator 2-1, the b2 port of the first circulator 2-1 is connected to the c1 port of the first coupler 3-1, the c2 port of the first coupler 3-1 is connected to the d1 port of the first mach-zehnder interferometer 4-1, the d2 port of the first mach-zehnder interferometer 4-1 is connected to the e1 port of the first photodetector 5-1, the e2 port of the first photodetector 5-1 is connected to the f1 port of the first electrical amplifier 6-1, the f1 port of the first electrical amplifier 6-1 is connected to the g3 port of the first phase modulator 7-1, the c3 port of the first coupler 3-1 is connected with the g1 port of the first phase modulator 7-1, the g4 port of the first phase modulator 7-1 is connected with the b7 port of the third circulator 2-3, the b9 port of the third circulator 2-3 is connected with the c4 port of the second coupler 3-2, and the c5 port of the second coupler 3-2 is connected with the b3 port of the first circulator 2-1. The a2 port of the second chaotic laser 1-2 is connected to the b4 port of the second circulator 2-2, the b4 port of the second circulator 2-2 is connected to the d3 port of the second mach-zehnder interferometer 4-2, the d4 port of the second mach-zehnder interferometer 4-2 is connected to the e3 port of the second photodetector 5-2, the e4 port of the second photodetector 5-2 is connected to the f3 port of the second electrical amplifier 6-2, the f4 port of the second electrical amplifier 6-2 is connected to the g4 port of the first phase modulator 7-1, and the c6 port of the second coupler 3-2 is connected to the b6 port of the second circulator 2-2.
The transmitting end and the receiving end are connected with the b10 port of the fourth circulator 2-4 in the receiving end by optical fibers through the b8 port of the third circulator 2-3, so that the communication connection between the transmitting end and the receiving end is formed.
The receiving end comprises a third chaotic laser 1-3, a second beam splitter 8-2, a fifth circulator 2-5, a third coupler 3-3, a third Mach-Zehnder interferometer 4-3, a third photoelectric detector 5-3, a third electric amplifier 6-3, a fourth chaotic laser 1-4, a sixth circulator 2-6, a fourth Mach-Zehnder interferometer 4-4, a fourth photoelectric detector 5-4, a fourth electric amplifier 6-4, a second phase modulator 7-2, a fourth coupler 3-4 and a fourth circulator 2-4. Specifically, the a3 port of the third chaotic laser 1-3 in the transmitting end is connected to the i3 port of the second beam splitter 8-2, the i4 port of the second beam splitter 8-2 is connected to the b13 port of the fifth circulator 2-5, the b15 port of the fifth circulator 2-5 is connected to the c10 port of the third coupler 3-3, the c11 port of the third coupler 3-3 is connected to the d5 port of the third mach-zehnder interferometer 4-3, the d6 port of the third mach-zehnder interferometer 4-3 is connected to the e5 port of the third photodetector 5-3, the e6 port of the third photodetector 5-31 is connected to the f5 port of the third electrical amplifier 6-3, the f6 port of the third electrical amplifier 6-3 is connected to the g7 port of the second phase modulator 7-2, the c12 port of the third coupler 3-3 is connected with the g5 port of the second phase modulator 7-2, the g6 port of the second phase modulator 7-2 is connected with the b11 port of the fourth circulator 2-4, the b12 port of the fourth circulator 2-4 is connected with the c7 port of the fourth coupler 3-4, and the c8 port of the fourth coupler 3-4 is connected with the b14 port of the fifth circulator 2-5. The a4 port of the fourth chaotic laser 1-4 is connected with the b16 port of the sixth circulator 2-6, the b17 port of the sixth circulator 2-6 is connected with the d7 port of the fourth mach-zehnder interferometer 4-4, the d8 port of the fourth mach-zehnder interferometer 4-4 is connected with the e7 port of the fourth photodetector 5-4, the e8 port of the fourth photodetector 5-4 is connected with the f7 port of the fourth electrical amplifier 6-4, the f8 port of the fourth electrical amplifier 6-4 is connected with the g8 port of the second phase modulator 7-2, and the c9 port of the fourth coupler 3-4 is connected with the b18 port of the sixth circulator 2-6.
The fifth photoelectric detector 5-5 and the sixth photoelectric detector 5-6 detect the transmitted and local optical chaotic signals separated by the first beam splitter 8-1, then subtract the detected signals to obtain a synchronous error, recover the information difference after filtering, and then recover the transmitted information by operating with the local signals. And the other end of the optical fiber detects the transmitted and local optical chaotic signals separated by the second beam splitter by using a seventh photoelectric detector 5-7 and an eighth photoelectric detector 5-8, then the synchronous errors are obtained by subtraction, the information difference can be recovered after filtering, and the transmitted information can also be recovered by operating with the local signals.
In the device, the parameters of the first chaotic laser 1-1 at the sending end and the third chaotic laser 1-3 at the receiving end are the same, and the parameters of the second chaotic laser 1-2 at the sending end and the fourth chaotic laser 1-4 at the receiving end are the same.
The following describes a manner of using the time delay signature hiding secure communication system of the present embodiment in conjunction with the above system structure.
The bidirectional chaotic communication system divides a chaotic optical signal output by a first chaotic laser 1-1 into two paths after entering a first coupler 3-1 through a first beam splitter 8-1 and a first circulator 2-1, wherein one path enters a first phase modulator 7-1, the other path enters a first Mach-Zehnder interferometer 4-1 and then enters a first photoelectric detector 5-1 and a first electric amplifier 6-1, and the optical signal entering the first phase modulator 7-1 is subjected to phase modulation after being amplified to generate an additional phase x 1; the chaotic light signal output by the second chaotic laser 1-2 enters the second Mach-Zehnder interferometer 4-2 through the second circulator 2-2, then enters the second photoelectric detector 5-2 and the second electric amplifier 6-2, the optical signal entering the first phase modulator 7-1 is subjected to phase modulation after being amplified, and the generated additional phase is x2, so that the additional phase of the output signal of the first phase modulator 7-1 is x1-x 2. The output signal of the first phase modulator enters a third circulator 2-3, is sent to a fourth circulator 2-4 at a receiving end through an optical fiber, then enters a fourth coupler 3-4, and is divided into two paths, and one path is coupled to a third chaotic laser 1-3 through a fifth circulator 2-5 and a second beam splitter 8-2; the other path passes through a sixth circulator 2-6 and is finally coupled to a fourth chaotic laser 1-4.
The chaotic light signal output by the third chaotic laser 1-3 at the other end of the link enters the third coupler 3-3 through the second beam splitter 8-2 and the fifth circulator 2-5 and then is divided into two paths, one path enters the second phase modulator 7-2, the other path enters the third Mach-Zehnder interferometer 4-3 and then enters the third photoelectric detector 5-3 and the third electric amplifier 6-3, the optical signal entering the second phase modulator 7-2 is subjected to phase modulation after being amplified, and the generated additional phase is x 3; the chaotic light signal output by the fourth chaotic laser 1-4 enters the fourth Mach-Zehnder interferometer 4-4 through the sixth circulator 2-6, then enters the fourth photoelectric detector 5-4 and the fourth electric amplifier 6-4, the optical signal entering the second phase modulator 7-2 is subjected to phase modulation after being amplified, the generated additional phase is x4, and therefore the additional phase of the output signal 7-2 of the second phase modulator is x3-x 4. The output signal of the second phase modulator 7-2 enters a fourth circulator 2-4, a third circulator 2-3 is sent through an optical fiber, and then enters a second coupler 3-2 to be divided into two paths, wherein one path is coupled to a first chaotic laser 1-1 through a first circulator 2-1 and a first beam splitter 8-1; the other path is coupled to a second chaotic laser 1-2 through a second circulator 2-2;
and finally, coupling between the lasers at the two ends is realized, and a synchronous chaotic signal is generated between the first chaotic laser 1-1 and the third chaotic laser 1-3.
After synchronization, information is used for modulating bias currents of a first chaotic laser 1-1 and a third chaotic laser 1-3 at two ends of a link to realize encryption, based on the robustness of chaotic synchronization, one end of the chaotic synchronous circuit utilizes a fifth photoelectric detector 5-5 and a sixth photoelectric detector 5-6 to detect the transmission of a first beam splitter separation 8-1 and a local optical chaotic signal, then a synchronous error is obtained by subtraction, the information difference can be recovered after filtering, and the transmitted information can be recovered by operation with the local signal. And the other end of the optical signal is used for detecting the sending of the second beam splitter separation 8-2 and the local optical chaotic signal by using a seventh photoelectric detector 5-7 and an eighth photoelectric detector 5-8, then, the synchronous error is obtained by subtracting the signals, the information difference can be recovered after filtering, and the sending information can also be recovered by operating the signals with the local signal.
As shown in fig. 2, the transmitting end is a chaotic signal modulated by information; as shown in fig. 3, a chaotic signal generated by a receiving end; as shown in fig. 4, (a) and (b) are information transmitted from both ends, (c) and (d) are information to be recovered, and (a) and (c) are the same and (b) and (d) are the same, which explains that the information can be recovered.
The process of implementing communication is briefly summarized as follows:
1. the two lasers at the transmitting end and the receiving end generate chaotic signals to be changed into electric signals, the phase modulators are modulated, phases are superposed by the phase modulators and are coupled to the two opposite lasers to generate delayed hidden chaotic signals.
2. After the two ends of the transceiver are synchronous, the bias current of the laser at the two ends is modulated by information after the two ends of the transceiver are synchronous, and information encryption is realized.
3. The photoelectric detector is used for detecting local and received optical power signals, a synchronous error is obtained by subtracting, and the information difference is recovered by low-pass filtering and then is calculated with local information, so that the information of the sending end can be recovered.
The chaotic communication method and the chaotic communication device realize chaotic communication by utilizing common devices, and have 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. An electro-optical phase mutual coupling bidirectional chaotic communication system, comprising:
the transmitting end comprises a first chaotic laser, a first beam splitter, a first circulator, a first coupler, a first Mach-Zehnder interferometer, a first photoelectric detector, a first electric amplifier and a first phase modulator which are sequentially connected; the first chaotic laser, the first circulator, the first Mach-Zehnder interferometer, the first photoelectric detector and the first electric amplifier are connected in sequence; the first coupler is also connected with the first phase modulator;
the receiving end comprises a third chaotic laser, a second beam splitter, a fifth circulator, a third coupler, a third Mach-Zehnder interferometer, a third photoelectric detector, a third electric amplifier and a second phase modulator which are sequentially connected, and further comprises a fourth chaotic laser, a sixth circulator, a fourth Mach-Zehnder interferometer, a fourth photoelectric detector and a fourth electric amplifier which are sequentially connected, wherein the fourth electric amplifier is connected with the second phase modulator, the fifth circulator and the sixth circulator are both connected with the fourth coupler, and the fourth coupler and the second phase modulator are both connected with the fourth circulator; the third coupler is also connected with the second phase modulator;
the third circulator is connected with the fourth circulator through an optical fiber;
the first beam splitter is respectively connected with the fifth photoelectric detector and the sixth photoelectric detector, and the second beam splitter is respectively connected with the seventh photoelectric detector and the eighth photoelectric detector.
2. The electro-optical phase-intercoupled bidirectional chaotic communication system according to claim 1, wherein the chaotic optical signal output by the first chaotic laser is sequentially split into two paths through the first beam splitter, the first circulator and the first coupler, one path enters the first phase modulator, the other path enters the first mach-zehnder interferometer, the first photodetector and the first electrical amplifier, the optical signal entering the first phase modulator is subjected to phase modulation after amplification, and an additional phase is generatedx 1；
The chaotic light signal output by the second chaotic laser sequentially passes through the second circulator, enters the second Mach-Zehnder interferometer, the second photoelectric detector and the second electric amplifier, and is amplified to perform phase modulation on the light signal entering the first phase modulator, and the generated additional phase isx 2；
First phaseAdditional phases of the output signal of the bit modulator arex 1-x 2The output signal of the first phase modulator enters a third circulator, is accessed into a fourth circulator through an optical fiber and then enters a fourth coupler, and is divided into two paths, wherein one path is coupled to a third chaotic laser through a fifth circulator and a second beam splitter; the other path is coupled to a fourth chaotic laser through a sixth circulator.
3. The electro-optical phase-intercoupled bidirectional chaotic communication system according to claim 2, wherein a chaotic optical signal output by the third chaotic laser is sequentially split into two paths through the second beam splitter, the fifth circulator and the third coupler, one path enters the second phase modulator, the other path enters the third mach-zehnder interferometer, the third photoelectric detector and the third electric amplifier in sequence, the optical signal entering the second phase modulator is subjected to phase modulation after amplification, and a generated additional phase isx 3；
The chaotic optical signal output by the fourth chaotic laser sequentially passes through a sixth circulator, a fourth Mach-Zehnder interferometer, a fourth photoelectric detector and a fourth electric amplifier, the optical signal entering the second phase modulator is subjected to phase modulation after being amplified, and the generated additional phase isx 4；
Additional phase of the second phase modulator output signal isx 3-x 4The output signal of the second phase modulator enters a fourth circulator, is accessed into a third circulator through an optical fiber and then enters a second coupler to be divided into two paths, one path is coupled to the first chaotic laser through the first circulator and the first beam splitter, and the other path is coupled to the second chaotic laser through the second circulator;
and a synchronous chaotic signal is generated between the first chaotic laser and the third chaotic laser.
4. The electro-optical phase intercoupling bidirectional chaotic communication system according to claim 3, wherein after synchronization, information is used for modulating bias currents of a first chaotic laser and a third chaotic laser at two ends of a link to realize encryption, based on robustness of chaotic synchronization, one end of the chaotic synchronous communication system detects a transmitted signal separated by a first beam splitter and a local optical chaotic signal, then a synchronous error is obtained by subtraction, an information difference is recovered after filtering, and then the chaotic synchronous communication system is operated with a local signal to recover the transmitted information; and the other end of the optical fiber detects the transmitted and local optical chaotic signals separated by the second beam splitter by using a seventh photoelectric detector and an eighth photoelectric detector, then subtracts the signals to obtain a synchronous error, recovers an information difference after filtering, and then performs operation on the information difference and a local signal to recover the transmitted information.
5. The electro-optical phase mutual coupling bidirectional chaotic communication system as claimed in any one of claims 1 to 4, wherein the external cavity feedback delay time of the first chaotic laser and the third chaotic laser is 2.97 ns.
6. The electro-optical phase mutual coupling bidirectional chaotic communication system as claimed in any one of claims 1 to 4, wherein the external cavity feedback delay time of the second chaotic laser and the fourth chaotic laser is 2.77 ns.
7. The electro-optical phase-coupled bidirectional chaotic communication system according to any one of claims 1 to 4, wherein a coupling delay between chaotic lasers communicating at both ends of a link is 6.8 ns.
8. The electro-optical phase mutual coupling bidirectional chaotic communication system as claimed in any one of claims 1 to 4, wherein the bias current of the first chaotic laser and the third chaotic laser is 32 mA.
9. The electro-optical phase-intercoupled bidirectional chaotic communication system according to any one of claims 1 to 4, wherein bias currents of the second chaotic laser and the fourth chaotic laser are 30 mA.
10. The bidirectional chaotic communication system with intercoupling of electro-optic phases as claimed in any one of claims 1 to 4, wherein the first, second, third and fourth chaotic lasers generate signals with wavelength of 1550nm and power of 10 mW.
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