CN112865952A - Variable-parameter photoelectric phase chaotic communication system - Google Patents
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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
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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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5051—Laser transmitters using external modulation using a series, i.e. cascade, combination of modulators
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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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- H04B10/516—Details of coding or modulation
- H04B10/5161—Combination of different modulation schemes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—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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- H—ELECTRICITY
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Abstract
The invention relates to a variable-parameter photoelectric phase chaotic communication system, which comprises: the transmitting end comprises a first chaotic laser, a first circulator, a first coupler, a first Mach-Zehnder interferometer, a first photoelectric detector, a first electric amplifier, a first phase modulator and a second coupler which are sequentially connected; the first chaotic laser, the first Mach-Zehnder interferometer, the second photoelectric detector and the second electric amplifier are connected in sequence, and the first electric amplifier is connected with the first phase modulator; the receiving end comprises a third coupler, a third Mach-Zehnder interferometer, a third photoelectric detector, a third electric amplifier, a second phase modulator, a first optical isolator, a first beam splitter and a third chaotic laser which are sequentially connected; the first beam splitter is also connected with a fourth photoelectric detector and a fifth photoelectric detector respectively; the second coupler and the third coupler are connected through an optical fiber. The invention 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 a variable-parameter photoelectric phase chaotic communication system.
Background
The internal and external parameters of the laser in optical chaotic communication can be regarded as keys of two communication parties, because chaotic synchronization is the basis of communication, and the optical chaotic signal can be synchronized only when the parameters of a transmitting end and a receiving end are matched, so that a signal to be transmitted can be modulated into the optical chaotic signal, and the received chaotic signal and a local chaotic signal are subtracted by utilizing the robustness of the chaotic signal at the receiving end, so that the signal can be demodulated. If the parameters of the laser communication system are easy to guess or measure, the communication safety is affected, and particularly after the feedback delay is hidden, the safety of chaotic communication can be enhanced.
Therefore, it is necessary to hide the feedback time delay parameter, and a new scheme for delaying and hiding secure communication is provided.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a variable-parameter photoelectric phase chaotic communication system. The invention is characterized in that two chaotic lasers are used for generating 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, the first path of optical signal is subjected to phase modulation, then the phase modulation is fed back to the first laser and is transmitted to a receiving end, so that a time delay signature is hidden, phase reversal synchronization is generated at the receiving end by using the phase modulator, the phase chaos in a received signal is counteracted, the receiving end laser is driven to generate synchronization, the encryption of the signal is realized by modulating the bias current of the transmitting end laser, the transmitted information is decrypted by detecting the synchronization error, and further, safe communication is carried out.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
a variable parameter photoelectric phase chaotic communication system comprises:
the transmitting end comprises a first chaotic laser, a first circulator, a first coupler, a first Mach-Zehnder interferometer, a first photoelectric detector, a first electric amplifier, a first phase modulator and a second coupler which are sequentially connected; the first chaotic laser, the first Mach-Zehnder interferometer, the second photoelectric detector and the second electric amplifier are connected in sequence, and the first electric amplifier is connected with the first phase modulator; the first coupler is connected with the first phase modulator;
the receiving end comprises a third coupler, a third Mach-Zehnder interferometer, a third photoelectric detector, a third electric amplifier, a second phase modulator, a first optical isolator, a first beam splitter and a third chaotic laser which are sequentially connected; the first beam splitter is also connected with a fourth photoelectric detector and a fifth photoelectric detector respectively; the third coupler is connected with the second phase modulator;
the second coupler and the third coupler are connected through an optical fiber.
As a preferred scheme, the chaotic optical signal output by the first chaotic laser enters the first coupler through the first circulator and is divided into two paths, one path of optical signal enters the first phase modulator, the other path of optical signal sequentially enters the first mach-zehnder interferometer, the first photoelectric detector and the first electric amplifier for amplification and then carries out phase modulation on the optical signal entering the first phase modulator, and the generated additional phase is x1(ii) a The chaotic light signal output by the second chaotic laser sequentially enters a second Mach-Zehnder interferometer, a second photoelectric detector and a second electric amplifier for amplification, and then the optical signal entering the first phase modulator is subjected to phase modulation, and the generated additional phase is x2The additional phase of the output signal of the first phase modulator is x1-x2And simultaneously generating a chaotic signal with hidden delay time.
As a preferred scheme, the output signal of the first phase modulator enters a second coupler and then is divided into two paths, one path of signal is fed back to the first laser through a first circulator, the other path of signal is transmitted to a third coupler at a receiving end through an optical fiber and then is divided into two paths, one path of signal enters the second phase modulator, the other path of signal enters a third mach-zehnder interferometer, a third photoelectric detector and a third electric amplifier in sequence and then is subjected to phase modulation on the optical signal entering the second phase modulator, and the generated additional phase is x2-x1(ii) a The additional phase of the second phase modulator output signal being x1-x2+x2-x1When the signal is equal to 0, the phase chaos disappears and becomes an intensity chaos signal.
As a preferred scheme, the intensity chaotic signal sequentially passes through a first optical isolator and a first optical beam splitter, enters a third laser and drives the third laser to be synchronous with the first laser; after synchronization, information is used for modulating bias current of the first laser to realize encryption, based on robustness of chaotic synchronization, the fourth and fifth photoelectric modulators are used for detecting the transmitted signal separated by the first beam splitter and the local optical chaotic signal, then subtraction is carried out to obtain a synchronization error, and the transmitted signal can be recovered after filtering.
Preferably, the external cavity feedback delay time of the first chaotic laser is 2.87ns, the external cavity feedback delay time of the second chaotic laser is 2.67ns, and the delay time of the first chaotic laser driving the third chaotic laser is 4.87 ns.
Preferably, the bias current of the first chaotic laser and the bias current of the third chaotic laser are 32mA, and the bias current of the second chaotic laser is 30 mA.
Preferably, the first chaotic laser, the second chaotic laser and the third chaotic laser generate signals with the wavelength of 1550nm and the power of 10 mW.
Preferably, the first, second and third electrical amplifiers have a gain of 10 dB.
Preferably, the quantum efficiency of the first photodetector, the second photodetector, the third photodetector, the fourth photodetector, and the fifth photodetector is 10%.
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 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 and 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 second coupler and is divided into two paths, one path is fed back to a first laser through a first circulator, the other path is transmitted to a third coupler at a receiving end through an optical fiber and 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 x2-x1(ii) a Such that the additional phase of the second phase modulator output signal is x1-x2+x2-x1When the phase chaos disappears and becomes an intensity chaos, the intensity chaos enters a first optical isolator, a first optical beam splitter and a third laser to drive the third laser to be synchronous with the first laser; after synchronization, information is used for modulating bias current of the first laser to realize encryption, based on robustness of chaotic synchronization, the fourth and fifth photoelectric modulators are used for detecting the separated transmission of the first beam splitter and local optical chaotic signals, then subtraction is carried out to obtain synchronization error, and transmission can be recovered after filteringOf the signal of (1).
Compared with the prior art, the invention has the beneficial effects that:
according to the variable-parameter photoelectric phase chaotic communication system, because the time sequences of the two lasers do not have correlation, the two irrelevant chaotic phases are superposed by using the phase modulator to generate feedback scrambling, and the feedback chaotic phase is fed back to the first laser to cause time delay signature hiding, so that the chaotic time delay hiding of chaotic synchronous communication is realized, and the variable-parameter photoelectric phase chaotic communication system has the characteristics of stable performance, strong confidentiality and the like.
Drawings
Fig. 1 is a schematic diagram of a structure of an electro-optical phase 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 a schematic diagram of a binary signal sent by a sending end according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a binary signal recovered by a receiving end according to an embodiment of the present invention;
wherein: 1-1, 1-2 and 1-3 respectively represent a first chaotic laser, a second chaotic laser and a third chaotic laser; 2 is a first circulator; 3-1, 3-2 and 3-3 are first, second and third couplers, respectively; 4-1, 4-2 and 4-3 and 2-2 are first, second and third mach-zehnder interferometers, respectively; 5-1, 5-2, 5-3, and 5-4 and 5-5 are first, second, third, and fourth, fifth photodetectors; 6-1, 6-2 and 6-3 are first, second and third electrical amplifiers, respectively; 7-1 and 7-2 denote first and second phase modulators, respectively; 8 is a first optical isolator; and 9 is a first 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 variable-parameter photoelectric phase chaotic communication system comprises a sending end and a receiving end, wherein the sending end and the receiving end are connected through optical fibers.
Specifically, as shown in fig. 1, the specific connection relationship of the above devices of the secure communication system is as follows:
the transmitting end comprises a first chaotic laser 1-1, a first circulator 2, 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 Mach-Zehnder interferometer 4-2, a second photoelectric detector 5-2, a second electric amplifier 6-2, a first phase modulator 7-1 and a second coupler 3-2.
Wherein the a1 port of the first chaotic laser 1-1 is connected with the b1 port of the first circulator 2, the b2 port of the first circulator 2 is connected with the c1 port of the first coupler 3-1, the c2 port of the first coupler 3-1 is connected with the d1 port of the first Mach-Zehnder interferometer 4-1, the d2 port of the first Mach-Zehnder interferometer 4-1 is connected with the e1 port of the first photodetector 5-1, the e2 port of the first photodetector 5-1 is connected with the f1 port of the first electrical amplifier 6-1, the f1 port of the first electrical amplifier 6-1 is connected with 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 c4 port of the second phase modulator 3-2, the c6 port of the second coupler 3-2 is connected with the b3 port of the first circulator 2.
The a1 port of the second chaotic laser 1-2 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,
the transmitting end and the receiving end are connected with the c7 port of the third coupler 3-3 in the receiving end by optical fibers through the c5 port of the second optical coupler 3-2, thereby constituting a communication connection between the transmitting end and the receiving end.
The receiving end comprises 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 second phase modulator 7-2, a first optical isolator 8, a fourth photoelectric detector 5-4, a fifth photoelectric detector 5-4, a first beam splitter 9 and a third chaotic laser 1-3. Specifically, the c9 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 5-3 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 c8 port of the third coupler 3-3 is connected to the g5 port of the second phase modulator 7-2, the g6 port of the second phase modulator 7-2 is connected to the h1 port of the first optical isolator 8, the h2 port of the first optical isolator 8 is connected to the i1 port of the first beam splitter 9, the i2 port of the first beam splitter 9 is connected to the chaotic laser 3 a of the third Mach-Zehnder interferometer 4-3, the i3 port of the first beam splitter 9 is connected to the e7 port of the fourth photodetector 5-4, and the i4 port of the first beam splitter 9 is connected to the e7 port of the fifth photodetector 5-4.
In the device, the parameters of the first chaotic laser at the sending end and the third chaotic laser at the receiving end are the same. Specifically, the external cavity feedback delay time of the first chaotic laser is 2.87ns, the external cavity feedback delay time of the second chaotic laser is 2.67ns, and the delay time of the first chaotic laser driving the third chaotic laser is 4.87 ns;
the bias current of the first chaotic laser and the third chaotic laser is 32mA, and the bias current of the second chaotic laser is 30 mA;
the signal wavelength generated by the first chaotic laser, the second chaotic laser and the third chaotic laser is 1550nm, and the power is 10 mW;
the gains of the first, second and third electrical amplifiers are 10 dB;
the quantum efficiency of the first photodetector, the second photodetector, the third photodetector, the fourth photodetector, and the fifth photodetector is 10%.
The following describes a manner of using the secure communication system with hidden time delay signature according to the present embodiment in conjunction with the above system configuration.
A chaotic optical signal output by a first chaotic laser 1-1 in a sending end enters a first coupler 3-1 through a first circulator 2 and then is divided into two paths, one path enters a first phase modulator 7-1, the other path enters a first Mach-Zehnder interferometer 4-1 and then sequentially enters a first photoelectric detector 5-1 and a first electric amplifier 6-1, the chaotic optical signal is amplified and then carries out phase modulation on the other path of optical signal entering the first phase modulator 7-1, and an additional phase x is generated1(ii) a The chaotic light signal output by the second chaotic laser 1-2 enters the second Mach-Zehnder interferometer 4-2, then enters the second photoelectric detector 5-2 and the second electric amplifier 6-2, and the optical signal entering the first phase modulator 7-1 is subjected to phase modulation after being amplified to generate an additional phase x2Such that the total additional phase of the output signal of the first phase modulator is x1-x2。
The signal output by the first phase modulator 7-1 enters the second coupler 3-2 and is divided into two paths, one path passes through the first circulator 2 and is fed back to the first laser 1-1, the other path is transmitted to the third coupler 3-3 at the receiving end through the optical fiber and 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, 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 x2-x1(ii) a Such that the additional phase of the second phase modulator output signal is x1-x2+x2-x1When the phase chaos disappears and becomes intensity chaos, the optical signal enters the first optical isolator 8, the first optical beam splitter 9 and the third laser 1-3 to drive the third laser to be synchronous with the first laser. After synchronization, the bias current of the first laser 1-1 is modulated by information to realize encryption, and based on the robustness of chaotic synchronization, the fourth photoelectric modulator 5-4 and the fifth photoelectric modulator are utilized5-5, the transmitted signal separated by the first beam splitter 9 and the local optical chaotic signal are detected, then the synchronous error is obtained by subtraction, and the transmitted signal can be recovered after filtering.
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 and 5, the original signal transmitted by the transmitting end is identical to the signal decrypted by the receiving end, which illustrates that the optical-electrical phase chaotic communication system of the present invention can be applied to secure communication.
The process of implementing communication is briefly summarized as follows:
1. two lasers at a sending end generate chaotic signals to be changed into electric signals, the phase modulators are modulated, phases are superposed by the phase modulators and fed back to the lasers, and delay hidden chaotic signals are generated.
2. The receiving end eliminates the phase chaos, and the signal is a strength chaos signal.
3. And driving a third laser of the receiving end by the intensity chaotic signal to be synchronous with the received chaotic signal.
4. After the two transmitting and receiving ends are synchronous, the information modulates the laser bias current of the transmitting end after the two transmitting and receiving ends are synchronous, and information encryption is realized.
5. And detecting local and received optical power signals by using a photoelectric detector, subtracting a synchronization error, and recovering information of a sending end through low-pass filtering.
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 (9)
1. A variable parameter photoelectric phase chaotic communication system is characterized by comprising:
the transmitting end comprises a first chaotic laser, a first circulator, a first coupler, a first Mach-Zehnder interferometer, a first photoelectric detector, a first electric amplifier, a first phase modulator and a second coupler which are sequentially connected; the first chaotic laser, the first Mach-Zehnder interferometer, the second photoelectric detector and the second electric amplifier are connected in sequence, and the first electric amplifier is connected with the first phase modulator; the first coupler is connected with the first phase modulator;
the receiving end comprises a third coupler, a third Mach-Zehnder interferometer, a third photoelectric detector, a third electric amplifier, a second phase modulator, a first optical isolator, a first beam splitter and a third chaotic laser which are sequentially connected; the first beam splitter is also connected with a fourth photoelectric detector and a fifth photoelectric detector respectively; the third coupler is connected with the second phase modulator;
the second coupler and the third coupler are connected through an optical fiber.
2. The parameter-variable optical-electrical phase chaotic communication system according to claim 1, wherein the chaotic optical signal output by the first chaotic laser enters the first coupler through the first circulator and is divided into two paths, one path of optical signal enters the first phase modulator, the other path of optical signal sequentially enters the first mach-zehnder interferometer, the first photodetector and the first electrical amplifier and is amplified to perform phase modulation on the optical signal entering the first phase modulator, and the generated additional phase is x1(ii) a The chaotic light signal output by the second chaotic laser sequentially enters a second Mach-Zehnder interferometer, a second photoelectric detector and a second electric amplifier for amplification, and then the optical signal entering the first phase modulator is subjected to phase modulation, and the generated additional phase is x2The additional phase of the output signal of the first phase modulator is x1-x2And simultaneously generating a chaotic signal with hidden delay time.
3. The variable parameter electro-optic phase chaotic communication system according to claim 2, wherein the output signal of the first phase modulator is divided into two paths after entering the second coupler,one path of signal is fed back to the first laser through the first circulator, the other path of signal is transmitted to a third coupler at a receiving end through an optical fiber and then divided into two paths, one path of signal enters the second phase modulator, the other path of signal enters a third Mach-Zehnder interferometer, a third photoelectric detector and a third electric amplifier in sequence, phase modulation is carried out on the optical signal entering the second phase modulator, and the generated additional phase is x2-x1(ii) a The additional phase of the second phase modulator output signal being x1-x2+x2-x1When the signal is equal to 0, the phase chaos disappears and becomes an intensity chaos signal.
4. The variable-parameter photoelectric phase chaotic communication system according to claim 3, wherein the intensity chaotic signal sequentially passes through the first optical isolator and the first optical beam splitter, enters the third laser, and drives the third laser to be synchronous with the first laser; after synchronization, information is used for modulating bias current of the first laser to realize encryption, based on robustness of chaotic synchronization, the fourth and fifth photoelectric modulators are used for detecting the transmitted signal separated by the first beam splitter and the local optical chaotic signal, then subtraction is carried out to obtain a synchronization error, and the transmitted signal can be recovered after filtering.
5. The variable parameter electro-optic phase chaotic communication system according to any one of claims 1-4, wherein the external cavity feedback delay time of the first chaotic laser is 2.87ns, the external cavity feedback delay time of the second chaotic laser is 2.67ns, and the delay time of the first chaotic laser driving the third chaotic laser is 4.87 ns.
6. The variable-parameter photoelectric phase chaotic communication system according to any one of claims 1 to 4, wherein the bias current of the first chaotic laser and the third chaotic laser is 32mA, and the bias current of the second chaotic laser is 30 mA.
7. The variable parameter electro-optic phase chaotic communication system according to any one of claims 1-4, wherein the first chaotic laser, the second chaotic laser and the third chaotic laser generate signals with a wavelength of 1550nm and a power of 10 mW.
8. The variable parameter electro-optic phase chaotic communication system according to any one of claims 1-4, wherein the first, second and third electrical amplifiers have a gain of 10 dB.
9. The variable parameter electro-optic phase chaotic communication system according to any one of claims 1-4, wherein the quantum efficiency of the first, second, third, fourth and fifth photodetectors is 10%.
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