CN113612544A - Optical chaotic secret communication system with four-dimensional key space - Google Patents
Optical chaotic secret communication system with four-dimensional key space Download PDFInfo
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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
- H04B10/5161—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
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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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Abstract
In the optical chaotic secret communication system with the four-dimensional key space, an erbium-doped optical fiber amplifier at a transmitting end sends out an optical signal which sequentially passes through a first phase modulator, a first optical fiber Bragg grating, a second phase modulator, a first coupler, a first Gires-Tournois interferometer cascade group, a first adjustable delay line, a first photoelectric detector and a first radio frequency amplifier and then returns to the second phase modulator; the first coupler is connected with a second coupler at a receiving end after sequentially passing through a standard single-mode fiber, a dispersion compensation fiber and an optical amplifier, the second coupler is connected with a first port of a third phase modulator after sequentially passing through a second Gires-Tournois interferometer cascade group, a second adjustable delay line, a second photoelectric detector and a second radio frequency amplifier, a second port of the third phase modulator is connected with the second coupler, and a third port of the third phase modulator is connected with the third photoelectric detector through a second fiber Bragg grating; and the laser at the transmitting end is connected to the first phase modulator sequentially through the in-phase quadrature modulator and the fourth photoelectric detector.
Description
Technical Field
The invention belongs to the technical field of optical information, and particularly relates to an optical chaotic secret communication system with a four-dimensional key space.
Background
Chaos refers to a deterministic, random-like, bounded but non-convergent process that occurs in a nonlinear system. The chaos phenomenon is applied to the technical field of communication, hardware encryption based on a physical layer can be realized, and the security is stronger compared with the traditional secret communication system based on application layer digital encryption and decryption. The optical chaotic system is easy to build and copy, the generated chaotic signal is extremely sensitive to the initial condition, and the result is greatly changed when a small difference is input into two completely same optical chaotic systems. Therefore, the same chaotic dynamics can be set up at the transmitting end and the receiving end by utilizing the easy replication of the optical chaotic system, and the information is encrypted and decrypted.
In the whole optical chaotic secret communication system, the secret keys are the hiding of the parameters of the transmitting end and a larger key space, and the larger key space prevents a third party from accurately estimating the parameters of the transmitting end, so that the interception resistance of encrypted information is ensured, an unauthorized person cannot copy chaotic dynamics of the transmitting end, the information confidentiality is effectively improved, and the communication safety is ensured.
Disclosure of Invention
The invention aims to solve the problem of information confidentiality of an optical chaotic communication system and provides an optical chaotic secret communication system with a four-dimensional key space.
In order to achieve the purpose, the invention adopts the following technical scheme:
the optical chaotic secret communication system with the four-dimensional key space comprises a transmitting end and a receiving end; the transmitting end comprises an erbium-doped fiber amplifier, a first optical signal sent by the erbium-doped fiber amplifier sequentially passes through a first phase modulator, a first fiber Bragg grating, a second phase modulator, a first coupler, a first Gires-Tournois interferometer cascade group, a first adjustable delay line, a first photoelectric detector and a first radio frequency amplifier and then returns to the second phase modulator; the first coupler is connected with a second coupler at a receiving end after sequentially passing through a standard single-mode fiber, a dispersion compensation fiber and an optical amplifier, the second coupler is connected with a first port of a third phase modulator after sequentially passing through a second Gires-Tournois interferometer cascade group, a second adjustable delay line, a second photoelectric detector and a second radio frequency amplifier, a second port of the third phase modulator is connected with the second coupler, and a third port of the third phase modulator is connected with the third photoelectric detector through a second fiber Bragg grating; and the laser at the transmitting end is connected to the first phase modulator sequentially through the in-phase quadrature modulator and the fourth photoelectric detector.
The second optical signal generated by the laser passes through the in-phase quadrature modulator and the fourth photoelectric detector and then is modulated with the erbium-doped fiber amplifier in the first phase modulator, the modulated signal is converted from phase to intensity in the first fiber Bragg grating, the converted signal is modulated by the second phase modulator, the modulated signal is divided into a third optical signal and a fourth optical signal through the first coupler, the third optical signal is fed into the channel for transmission, and the fourth optical signal passes through the first Gires-Tournois interferometer cascade group, the first adjustable delay line, the first photoelectric detector and the first radio frequency amplifier in sequence and then is input to the second phase modulator. And the optical signal III passes through the standard single-mode fiber, the dispersion compensation fiber and the optical amplifier in sequence and then passes through the second coupler, the second coupler divides the optical signal III into an optical signal V and an optical signal VI, the optical signal V and the optical signal VI are modulated in the third phase modulator and then output after passing through the second Gires-Tournois interferometer cascade group, the second adjustable delay line, the second photoelectric detector and the second radio frequency amplifier, and the output optical signal passes through the second fiber Bragg grating and the third photoelectric detector.
Preferably, the Gires-Tournois interferometer cascade group may be composed of Gires-Tournois interferometers with different cavity lengths and reflectivities, and the Gires-Tournois interferometer cascade group may generate different degrees of time delay for optical signals with different frequencies.
Preferably, the parameters of the corresponding devices between the transmitting end and the receiving end are the same, that is: the parameters of the first phase modulator, the second phase modulator and the third phase modulator are the same. The parameters of the first fiber Bragg grating and the second fiber Bragg grating are the same. The parameters of the first optical coupler and the second optical coupler are the same, and the parameters of the first Gires-Tournois interferometer cascade group and the parameters of the second Gires-Tournois interferometer cascade group are the same. The parameters of the first adjustable delay line and the second adjustable delay line are the same. The parameters of the first photoelectric detector, the second photoelectric detector, the third photoelectric detector and the fourth photoelectric detector are the same. The parameters of the first radio frequency amplifier and the second radio frequency amplifier are the same.
Preferably, the coupling coefficient of all the couplers is 0.5.
Preferably, the wavelength of the signal generated by the laser is 1550nm, the bandwidth of the ASE noise (first optical signal) generated by the erbium-doped fiber amplifier is 42nm, and the center frequency is 193.4 Thz.
As a preferred scheme, the receiving end directly outputs the recovered plaintext information.
Compared with the prior art, the invention has the beneficial effects that:
the four-dimensional key space of the optical chaotic communication system with the four-dimensional key space is respectively the accumulated dispersion of the fiber Bragg grating, the delay time of an adjustable delay line, a Gires-Tournois interferometer cascade group delay curve and the cascade number of the Gires-Tournois interferometer cascade group, thereby enlarging the key space, improving the information confidentiality, realizing the double chaotic encryption of phase and intensity, and being capable of combining with a higher modulation mode such as 16QAM to carry out the information confidentiality transmission.
Drawings
Fig. 1 is a schematic diagram of an architecture of an optical chaotic secure communication system with a four-dimensional key space according to an embodiment of the present invention.
Fig. 2 is a chaotic bifurcation diagram of feedback strength of an electro-optical delay feedback loop and output signal strength of a transmitting end in an optical chaotic secure communication system with a four-dimensional key space according to an embodiment of the present invention.
Fig. 3 is a chaotic bifurcation diagram of feedback strength of an electro-optical delay feedback loop and phase of an output signal at a transmitting end in the optical chaotic secure communication system with the four-dimensional key space according to the embodiment of the present invention.
Fig. 4 is a chaotic attractor of a sending end output signal x (t) in an optical chaotic secure communication system with a four-dimensional key space according to an embodiment of the present invention.
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 obtained from them without inventive effort.
As shown in fig. 1, the optical chaotic secret communication system with a four-dimensional key space in the embodiment of the present invention includes a transmitting end and a receiving end, where the transmitting end is connected to the receiving end, and the specific components include an erbium-doped fiber amplifier 1, a first phase modulator 2-1, a first grating bragg fiber 3-1, a second phase modulator 2-2, a first optical coupler 4-1, a first Gires-Tournois interferometer cascade group 5-1, a first adjustable delay line 6-1, a first photodetector 7-1, a first radio frequency amplifier 8-1, a laser 9, an in-phase quadrature modulator 10, a fourth photodetector 7-4, a standard single mode fiber 11, a dispersion compensation fiber 12, an optical amplifier 13, a second optical coupler 4-2, a second Gires-Tournois interferometer cascade group 5-2, A second adjustable delay line 6-2, a second photoelectric detector 7-2, a second radio frequency amplifier 8-2, a third phase modulator 2-3, a second fiber Bragg grating 3-2 and a third photoelectric detector 7-3.
The specific connection mode of the components is that a port a1 of the erbium-doped fiber amplifier 1 at the transmitting end is connected with a first port b1 of a first phase modulator 2-1, a third port b3 of the first phase modulator 2-1 is connected with a first port c1 of a first fiber Bragg grating 3-1, a second port c2 of the first fiber Bragg grating 3-1 is connected with a first port d1 of a second phase modulator 2-2, a second port d2 of the second phase modulator 2-2 is connected with a first port e1 of a first optical coupler 4-1, a second port e2 of the first optical coupler 4-1 is connected with a first port f1 of a first Gires-Tournois interferometer cascade group 5-1, a second port f2 of the first Gires-Tournois interferometer cascade group 5-1 is connected with a first port g1 of a first adjustable delay line 6-1, the second port g2 of the first adjustable delay line 6-1 is connected with the first port h1 of the first photodetector 7-1, the second port h2 of the first photodetector 7-1 is connected with the first port i1 of the first radio frequency amplifier 8-1, the second port i2 of the first radio frequency amplifier 8-1 is connected with the third port d3 of the second phase modulator 2-2, and an electro-optical time delay feedback loop is formed from the d2 port to the d3 port of the second phase modulator 2-2.
The output port u1 of the laser 9 is connected to the first port v1 of the in-phase quadrature modulator 10, the second port v2 of the in-phase quadrature modulator 10 is connected to the first port w1 of the fourth photodetector 7-4, and the second port w2 of the fourth photodetector 7-4 is connected to the second port b2 of the first phase modulator 2-1.
The third port e3 of the first optical coupler 4-1 is connected to the first port j1 of the standard single mode fiber 11, the second port j2 of the standard single mode fiber 11 is connected to the first port k1 of the dispersion compensation fiber 12, the second port k2 of the dispersion compensation fiber 12 is connected to the first port l1 of the optical amplifier 13, the second port l2 of the optical amplifier 13 is connected to the first port m1 of the second optical coupler 4-2, the second port m2 of the second optical coupler 4-2 is connected to the first port n1 of the second Gires-Tournois interferometer cascade group 5-2, the second port n2 of the second Gires-Tournois interferometer cascade group 5-2 is connected to the first port o1 of the second adjustable delay line 6-2, the second port o2 of the second adjustable delay line 6-2 is connected to the first port p1 of the second optical detector 7-2, and the second port p 388 of the second adjustable delay line 6-Tournois interferometer cascade group 5-2 is connected to the first port p 468 of the second optical detector 468 The port q1 is connected, the second port q2 of the second rf amplifier 8-2 is connected to the first port r1 of the third phase modulator 2-3, the second port r2 of the third phase modulator 2-3 is connected to the third port m3 of the second optical coupler 4-2, the third port r3 of the third phase modulator 2-3 is connected to the first port s1 of the second fiber bragg grating 3-2, the second port s2 of the second fiber bragg grating 3-2 is connected to the first port t1 of the third photodetector 7-3, and the second port t2 of the third photodetector 7-3 outputs the restored information.
The optical chaotic secret communication system with the four-dimensional key space disclosed by the embodiment has the following principles of encrypting information and expanding the key space: the method comprises the steps of utilizing ASE noise generated by an erbium-doped fiber amplifier as a random sequence to carry out phase modulation on plaintext information, encrypting the plaintext information on a phase, sending a signal subjected to phase encryption into a fiber Bragg grating, converting the phase encryption into intensity encryption, and providing the accumulated dispersion of a first dimension key, namely the fiber Bragg grating. And then, the strength encryption signal enters an electro-optical time delay feedback loop with a Gires-Tournois interferometer cascade group to realize phase encryption, the Gires-Tournois interferometer cascade group can generate time delays of different degrees for optical signals with different frequencies, the complexity of parameters of the chaotic system is greatly enhanced, and finally, double encryption is realized on the phase and the strength of plaintext information. In the system, the chaotic carrier can effectively hide the delay curve information of the Gires-Tournois interferometer cascade group, and the delay information curve prevents the chaotic system parameters from being easily cracked, so that a secret communication system with robustness is jointly constructed. The time delay generated by the adjustable delay line in the electro-optical time delay feedback loop, the time delay curve of the Gires-Tournois interferometer and the cascade number of the Gires-Tournois interferometer respectively provide three-dimensional keys, so that the key space is further expanded, the complexity of the parameters of the chaotic system is enhanced, and the safety of the chaotic communication system is improved.
The process of realizing communication by adopting the optical chaotic communication system with the four-dimensional key space of the embodiment is as follows:
1. the ASE noise generated by the erbium-doped fiber amplifier is used as a random entropy source to perform phase encryption on the 16QAM information output by the in-phase quadrature modulator, and the encrypted information is converted from phase encryption to intensity encryption through a fiber Bragg grating to obtain an intensity encryption waveform.
2. The intensity encrypted waveform enters an electro-optical time delay feedback loop, time delay is generated through a Gires-Tournois interferometer cascade group and an adjustable delay line, the time delay is converted into an electric signal through a photoelectric detector, the electric signal is amplified and fed back to a phase modulator through a radio frequency amplifier, phase information of a plaintext is encrypted in the feedback loop, and a key space is expanded into four dimensions.
3. After being decrypted by an electro-optical time delay feedback loop and an optical fiber Bragg grating with the same parameters at a receiving end, the parameters are converted into electric signals through a photoelectric detector and output, and the electric signals are transmitted plaintext information.
The invention realizes four-dimensional key space, enlarges key space, improves information confidentiality, realizes double chaotic encryption of phase and intensity, and can be combined with higher modulation modes such as 16QAM to carry out information confidential transmission.
While the preferred embodiments of the present invention have been described above, it is not intended to limit the scope of the present invention, and modifications in specific design will be suggested to those skilled in the art based on the teachings herein, and such modifications are to be considered as included within the scope of the present invention.
Claims (10)
1. The optical chaotic secret communication system with the four-dimensional key space comprises a transmitting end and a receiving end, and is characterized in that the transmitting end comprises an erbium-doped optical fiber amplifier (1), a first optical signal sent by the erbium-doped optical fiber amplifier (1) sequentially passes through a first phase modulator (2-1), a first optical fiber Bragg grating (3-1), a second phase modulator (2-2), a first coupler (4-1), a first Gires-Tournois interferometer cascade group (5-1), a first adjustable delay line (6-1), a first photoelectric detector (7-1) and a first radio frequency amplifier (8-1) and then returns to the second phase modulator (2-2);
the first coupler (4-1) is connected with the second coupler (4-2) at the receiving end after passing through a standard single mode fiber (11), a dispersion compensation fiber (12) and an optical amplifier (13) in turn, the second coupler (4-2) is connected with a first port of a third phase modulator (2-3) after sequentially passing through a second Gires-Tournois interferometer cascade group (5-2), a second adjustable delay line (6-2), a second photoelectric detector (7-2) and a second radio frequency amplifier (8-2), a second port of the third phase modulator (2-3) is connected with the second coupler (4-2), and a third port of the third phase modulator (2-3) is connected with the third photoelectric detector (7-3) through a second fiber Bragg grating (3-2);
and a laser (9) at the transmitting end is connected to the first phase modulator (2-1) through the in-phase quadrature modulator (10) and the fourth photoelectric detector (7-4) in sequence.
2. The optical chaotic secret communication system with the four-dimensional key space as claimed in claim 1, wherein the first Gires-Tournois interferometer cascade group is composed of Gires-Tournois interferometers with different cavity lengths and reflectivities, and the first Gires-Tournois interferometer cascade group generates different time delays for optical signals with different frequencies; and/or the second Gires-Tournois interferometer cascade group is composed of Gires-Tournois interferometers with different cavity lengths and reflectivities, and the second Gires-Tournois interferometer cascade group can generate different degrees of time delay for optical signals with different frequencies.
3. The optical chaotic secret communication system with the four-dimensional key space according to claim 1, wherein parameters of the first phase modulator, the second phase modulator and the third phase modulator are the same.
4. The optical chaotic secret communication system with the four-dimensional key space as claimed in claim 1, wherein the parameters of the first fiber bragg grating and the second fiber bragg grating are the same.
5. The optical chaotic secret communication system with the four-dimensional key space according to claim 1 or 2, characterized in that the parameters of the first optical coupler and the second optical coupler are the same; and/or the parameters of the first Gires-Tournois interferometer cascade group and the second Gires-Tournois interferometer cascade group are the same.
6. The optical chaotic secret communication system with the four-dimensional key space according to claim 1, wherein parameters of the first adjustable delay line and the second adjustable delay line are the same.
7. The optical chaotic secret communication system with the four-dimensional key space according to claim 1, wherein parameters of the first photodetector, the second photodetector, the third photodetector and the fourth photodetector are the same; and/or the parameters of the first radio frequency amplifier and the second radio frequency amplifier are the same.
8. The optical chaotic secret communication system with the four-dimensional key space according to claim 1, wherein the coupling coefficients of the first optical coupler and the second optical coupler are both 0.5.
9. The optical chaotic secret communication system with the four-dimensional key space according to claim 8, wherein the signal wavelength generated by the laser is 1550 nm.
10. An optical chaotic secret communication system with a four-dimensional key space according to any one of claims 1 to 4 and 6 to 9, wherein the bandwidth of ASE noise generated by the erbium-doped fiber amplifier is 42nm and the center frequency is 193.4 Thz.
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