CN117118520A - Optical chaotic secret communication system and method based on dispersion keying - Google Patents
Optical chaotic secret communication system and method based on dispersion keying Download PDFInfo
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- 230000006854 communication Effects 0.000 title claims abstract description 37
- 238000004891 communication Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 13
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- 239000013307 optical fiber Substances 0.000 claims abstract description 41
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Classifications
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
- H04B10/2525—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion using dispersion-compensating fibres
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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
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
- H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
- H04B10/5561—Digital phase modulation
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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
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6161—Compensation of chromatic dispersion
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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
Abstract
The invention relates to an optical chaotic secret communication system and method based on dispersion keying, wherein a main laser and an optical fiber reflector in a transmitting end of the system generate chaotic optical signals, the chaotic optical signals sequentially pass through a first circulator, a first slave laser and two filters and then return to the first circulator, and the first circulator is sequentially connected with a first photoelectric detector and a first phase modulator; the first semiconductor laser, the first phase modulator and the switch are sequentially connected, the switch is divided into two light paths, and the two light paths are respectively encrypted by the first optical fiber Bragg grating and the second optical fiber Bragg grating and then enter a receiving end together with the second optical coupler, the single mode optical fiber, the optical amplifier and the dispersion compensation optical fiber. The second optical fiber reflector, the second master laser, the second circulator, the second slave laser and the two filters of the receiving end are sequentially connected; the second circulator, the second photoelectric detector and the second phase modulator are connected in sequence; the second semiconductor laser, the second phase modulator, the third fiber Bragg grating, the balance photoelectric detector and the low-pass filter are sequentially connected.
Description
Technical Field
The invention belongs to the technical field of optical information, and particularly relates to an optical chaotic secret communication system and method based on dispersion keying.
Background
The chaotic signal is commonly existing in a nonlinear system, has the characteristics of sensitivity to an initial value, unpredictability, apparent noise, wide frequency band and the like, and a dynamic system is complex, so that the chaotic signal is very suitable for high-speed remote secret communication, and secret communication adopting the chaotic signal is hardware encryption based on a physical layer and has the potential of providing high-level privacy in data transmission.
In a common loading mode of information of an optical chaotic secret communication system, plaintext information is often directly involved in an encryption process, so that the concealed plaintext information in a chaotic signal is easy to steal after the chaotic signal is intercepted, and the defect of communication safety is caused. At present, the key of improving the safety of an optical chaotic secret communication system is hiding plaintext information, complexity of chaotic signals and size of a key space, so that the complexity of the chaotic signals is improved and the key space is increased while reasonably hiding the plaintext information, and the safety and reliability of the communication system can be effectively ensured. Based on the above, the invention provides an optical chaotic secret communication system and method based on dispersion keying.
Disclosure of Invention
The invention aims to improve the safety and reliability of information transmission in an optical chaotic communication system, and designs an optical chaotic secret communication system and method based on chromatic dispersion keying by combining a chaotic keying method with a chromatic dispersion device.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the optical chaotic secret communication system based on the chromatic dispersion keying comprises a transmitting end and a receiving end, wherein the transmitting end is connected with the receiving end, and the structure is as follows:
the transmitting end comprises a first master laser, a first optical fiber reflector, a first circulator, a first slave laser, a first optical coupler, a first filter, a second filter, a first photoelectric detector, a first semiconductor laser, a first phase modulator, a switch, a first fiber Bragg grating, a second fiber Bragg grating and a second optical coupler;
the receiving end comprises a second master laser, a second optical fiber reflector, a second circulator, a second slave laser, a third optical coupler, a third filter, a fourth filter, a second photoelectric detector, a second semiconductor laser, a second phase modulator, a third optical fiber Bragg grating, a balance photoelectric detector and a low-pass filter;
the first optical fiber reflector of the transmitting end is connected with the first port of the first circulator through the first master laser, the second port of the first circulator is connected with the first port of the first optical coupler through the first slave laser, the second port of the first optical coupler is connected with the first filter, and the third port of the first optical coupler is connected with the second filter; the third port of the first circulator is connected with the first port of the first phase modulator through a first photoelectric detector; the first semiconductor laser is connected with a second port of the first phase modulator, a third port of the first phase modulator is connected with a first port of the first fiber Bragg grating or a first port of the second fiber Bragg grating through a switch, the second port of the first fiber Bragg grating is connected with a first port of the second optical coupler, the second port of the second fiber Bragg grating is connected with a second port of the second optical coupler, and a third port of the second optical coupler, a standard single-mode fiber, an optical amplifier, a dispersion compensation fiber and a first port of the balance photoelectric detector are sequentially connected; the second optical fiber reflector at the receiving end is connected with the first port of the second circulator through the second master laser, the second port of the second circulator is connected with the first port of the third optical coupler through the second slave laser, the second port of the third optical coupler is connected with the third filter, and the third port of the third optical coupler is connected with the fourth filter; the third port of the second circulator is connected with the first port of the second phase modulator through a second photoelectric detector; the second semiconductor laser is connected with a second port of the second phase modulator, a third port of the second phase modulator is connected with a second port of the balance photoelectric detector through a third fiber Bragg grating, and a third port of the balance photoelectric detector is connected with the low-pass filter.
Preferably, the switch is controlled according to the binary plaintext information, when the information is "1", the switch is connected to the first fiber bragg grating, and when the information is "0", the switch is connected to the second fiber bragg grating.
Preferably, the coupling coefficient of all optocouplers is 0.5.
Preferably, the first primary laser and the second primary laser use the same parameters; the first optical fiber reflector and the second optical fiber reflector adopt the same parameters; the first slave laser and the second slave laser adopt the same parameters; the first filter and the third filter adopt the same parameters; the second filter and the fourth filter adopt the same parameters; the first semiconductor laser and the second semiconductor laser adopt the same parameters; the first phase modulator and the second phase modulator adopt the same parameters; the second fiber Bragg grating and the third fiber Bragg grating adopt the same parameters.
The invention also discloses an optical chaotic secret communication method based on the dispersion keying, which is based on the optical chaotic secret communication system and comprises the following steps:
the transmitting end generates a chaotic light signal I by using a first main laser through reflection of a first optical fiber reflector, a first slave laser with a first filter and a second filter serving as feedback cavities is injected through a first circulator to generate a light signal II, the light signal II is converted into a complex entropy source input into a phase modulator through a first photoelectric detector, the phase modulation is carried out on the light wave of the first semiconductor laser to generate a light signal III, and the light signal III is a phase chaotic waveform;
selecting different light paths after the light signals are switched three times according to different binary plaintext information, generating a light signal IV through a first fiber Bragg grating in a first light path, and generating a light signal V through a second fiber Bragg grating in a second light path; the optical signal IV or the optical signal V generates a balanced photoelectric detector of a signal six input receiving end through a second optical coupler, a standard single-mode optical fiber, an optical amplifier and a dispersion compensation optical fiber;
at the receiving end, the second main laser generates a chaotic light signal through reflection of a second optical fiber reflector, the chaotic light signal is injected into a second slave laser with a third filter and a fourth filter as feedback cavities through a second circulator, the optical signal is converted into a complex entropy source input into a phase modulator through a second photoelectric detector, the optical wave of a second semiconductor laser is subjected to phase modulation to generate an optical signal seven, and the optical signal seven is a phase chaotic waveform;
the optical signal seven generates an optical signal eight through a third fiber Bragg grating, the balance photoelectric detector receives an optical signal six from the transmitting end and an optical signal eight from the receiving end to generate an electric signal I, and the electric signal I is subjected to a low-pass filter and threshold judgment to recover plaintext information. The threshold judgment is to compare the signal value after low-pass filtering with the threshold value under the condition of reasonably setting the threshold value, and judge the restored plaintext information to be 1 when the signal value is larger than the threshold value, otherwise, to be 0.
Compared with the prior art, the invention has the beneficial effects that:
the optical chaotic secret communication system and the method based on the dispersion keying do not directly send plaintext information to a channel for transmission, but utilize binary plaintext information to control a switch at a transmitting end, so that different code element symbols are mapped to different chaotic attractors, and chaotic signals with substitution function are transmitted, thereby effectively avoiding information interception; meanwhile, the invention combines the chaos keying method with the dispersion device, can compress or broaden signals in the time domain, enhances the complexity of the chaos signals, and can also be used as a key, expands the key space and further improves the safety and reliability of a communication system.
Drawings
The invention is described in detail below with reference to the drawings and the detailed description.
Fig. 1 is a schematic diagram of an optical chaotic secure communication system based on dispersion keying according to a preferred embodiment of the present invention.
Fig. 2 is a diagram of binary plaintext information input from a transmitting end in an optical chaotic secure communication system based on dispersion keying according to a preferred embodiment of the present invention.
Fig. 3 is a chaotic signal diagram generated by a balanced photodetector and capable of representing binary information in an optical chaotic secure communication system based on dispersion keying according to a preferred embodiment of the present invention.
Fig. 4 is a chaotic signal diagram primarily recovered in an optical chaotic secure communication system based on dispersion keying according to a preferred embodiment of the present invention.
Fig. 5 is a signal diagram of the output of the low-pass filter in the optical chaotic secret communication system based on the chromatic dispersion keying according to the preferred embodiment of the invention.
Fig. 6 is a diagram of binary plaintext information recovered at a receiving end in an optical chaotic secure communication system based on dispersion keying according to a preferred embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, specific embodiments of the present invention will be described below with reference to the accompanying drawings. It is obvious that the drawings in the following description are only examples of the present invention, and that other drawings and other embodiments may be obtained from these drawings by those skilled in the art without inventive effort.
As shown in fig. 1, the optical chaotic secret communication system based on dispersion keying according to the preferred embodiment of the invention comprises a transmitting end and a receiving end, wherein:
the specific components of the transmitting end comprise a first master laser 1-1, a first optical fiber reflector 2-1, a first circulator 3-1, a first slave laser 4-1, a first optical coupler 5-1, a first filter 6-1, a second filter 6-2, a first photoelectric detector 8-1, a first semiconductor laser 9-1, a first phase modulator 10-1, a switch 11, a first optical fiber Bragg grating 12-1, a second optical fiber Bragg grating 12-2 and a second optical coupler 5-2;
the receiving end comprises a second master laser 1-2, a second optical fiber reflector 2-2, a second circulator 3-2, a second slave laser 4-2, a third optical coupler 5-3, a third filter 6-3, a fourth filter 6-4, a second photoelectric detector 8-2, a second semiconductor laser 9-2, a second phase modulator 10-2, a third optical fiber Bragg grating 12-3, a balance photoelectric detector 16 and a low-pass filter 17;
the transmitting end and the receiving end are connected through a standard single-mode fiber 13, an optical amplifier 14 and a dispersion compensation fiber 15.
The specific connection modes of the components are as follows:
in the transmitting end, a first port a1 of the first main laser 1-1 is connected with a port b1 of the first optical fiber reflector 2-1, a second port a2 of the first main laser 1-1 is connected with a first port c1 of the first circulator 3-1, a second port c2 of the first circulator 3-1 is connected with a first port d1 of the first slave laser 4-1, a second port d2 of the first slave laser 4-1 is connected with a first port e1 of the first optical coupler 5-1, a second port e2 of the first optical coupler 5-1 is connected with a port f1 of the first filter 6-1, and a third port e3 of the first optical coupler 5-1 is connected with a port g1 of the second filter 6-2; the third port c3 of the first circulator 3-1 is connected to the first port h1 of the first photo detector 8-1, and the second port h2 of the first photo detector 8-1 is connected to the first port j1 of the first phase modulator 10-1; the port i1 of the first semiconductor laser 9-1 is connected to the second port j2 of the first phase modulator 10-1, the third port j3 of the first phase modulator 10-1 is connected to the first port k1 of the switch 11, the second port k2 of the switch 11 is connected to the first port l1 of the first fiber bragg grating 12-1 or the first port m1 of the second fiber bragg grating 12-2, the second port l2 of the first fiber bragg grating 12-1 is connected to the first port n1 of the second optical coupler 5-2, and the second port m2 of the second fiber bragg grating 12-2 is connected to the second port n2 of the second optical coupler 5-2.
In the common channel between the transmitting end and the receiving end, the third port n3 of the second optical coupler 5-2 is connected to the first port o1 of the standard single-mode fiber 13, the second port o2 of the standard single-mode fiber 13 is connected to the first port p1 of the optical amplifier 14, the second port p2 of the optical amplifier 14 is connected to the first port q1 of the dispersion compensating optical fiber 15, and the second port q2 of the dispersion compensating optical fiber 15 is connected to the first port r1 of the balanced photodetector 16 at the receiving end.
In the receiving end, a first port s1 of the second main laser 1-2 is connected with a port t1 of the second optical fiber reflector 2-2, a second port s2 of the second main laser 1-2 is connected with a first port u1 of the second circulator 3-2, a second port u2 of the second circulator 3-2 is connected with a first port v1 of the second slave laser 4-2, a second port v2 of the second slave laser 4-2 is connected with a first port w1 of the third optical coupler 5-3, a second port w2 of the third optical coupler 5-3 is connected with a port x1 of the third filter 6-3, and a third port w3 of the third optical coupler 5-3 is connected with a port y1 of the fourth filter 6-4; the third port u3 of the second circulator 3-2 is connected to the first port z1 of the second photodetector 8-2, and the second port z2 of the second photodetector 8-2 is connected to the first port B1 of the second phase modulator 10-2; the port A1 of the second semiconductor laser 9-2 is connected to the second port B2 of the second phase modulator 10-2, the third port B3 of the second phase modulator 10-2 is connected to the first port C1 of the third fiber Bragg grating 12-3, the second port C2 of the third fiber Bragg grating 12-3 is connected to the second port r2 of the balanced photodetector 16, the third port r3 of the balanced photodetector 16 is connected to the first port D1 of the low pass filter 17, and the second port D2 of the low pass filter 17 outputs the restored plaintext information.
In this embodiment, the switch is controlled by binary information at the transmitting end, and when the information is "1", the switch is connected to the first fiber bragg grating 12-1, and when the information is "0", the switch is connected to the second fiber bragg grating 12-2.
In this embodiment, the coupling coefficient of all the optocouplers is 0.5.
In this embodiment, the first and second main lasers 1-1 and 1-2, the first and second fiber mirrors 2-1 and 2, the first and second slave lasers 4-1 and 4-2, the first and third filters 6-1 and 6-3, the second and fourth filters 6-2 and 6-4, the first and second semiconductor lasers 9-1 and 9-2, the first and second phase modulators 10-1 and 10-2, and the second and third fiber Bragg gratings 12-2 and 12-3 respectively use the same parameters.
The optical chaos secret communication system based on the dispersion keying disclosed by the embodiment specifically comprises the following steps of:
firstly, a first main laser 1-1 is utilized at a transmitting end to generate a chaotic light signal I through reflection of a first optical fiber reflector 2-1, then a first slave laser 4-1 with two filters, namely a first filter 6-1 and a second filter 6-2, serving as feedback cavities is injected into the first circulator 3-1 to generate a light signal II, the light signal II is converted into a complex entropy source input into a phase modulator through a first photoelectric detector 8-1, the light wave of a first semiconductor laser 9-1 is subjected to phase modulation to generate a light signal III, and the light signal III is a phase chaotic waveform. Then, according to different binary plaintext information, two different optical paths may be selected after the optical signal three passes through the switch 11, wherein in the first optical path, the optical signal four is generated by the first fiber bragg grating 12-1, and in the second optical path, the optical signal five is generated by the second fiber bragg grating 12-2. The fiber Bragg gratings can convert phase chaos into intensity chaos, the first fiber Bragg grating 12-1 and the second fiber Bragg grating 12-2 have different dispersion coefficients, so that different code element symbols are mapped into different chaotic attractors, plaintext information is hidden between the different code element symbols, the confidentiality of a system is enhanced, the fiber Bragg gratings can be used as a dispersion device to realize compression and broadening of signals in a time domain, the complexity of chaotic signals is enhanced, and meanwhile, a dispersion value is used as an important key, so that the key space is effectively increased. Finally, the optical signal four or the optical signal five is generated into a balanced photoelectric detector 16 of a signal six-input receiving end through a second optical coupler 5-2, a standard single-mode optical fiber 13, an optical amplifier 14 and a dispersion compensation optical fiber 15.
At the receiving end, the same principle as the transmitting end is adopted, a chaotic optical signal seven disturbed by the phase is generated by a second master laser 1-2, a second optical fiber reflector 2-2, a second circulator 3-2, a second slave laser 4-2, a third filter 6-3, a fourth filter 6-4, a second photoelectric detector 8-2, a second semiconductor laser 9-2 and a second phase modulator 10-2, the optical signal seven is the same as an optical signal three at the transmitting end, an optical signal eight is generated by the optical signal seven through a third optical fiber Bragg grating 12-3 with the same parameters as the second optical fiber Bragg grating, an electric signal one is generated after the balance photoelectric detector 16 receives an optical signal six from the transmitting end and an optical signal eight from the receiving end, and the recovery of plaintext information is realized after the low-pass filter 17 and threshold judgment. The threshold judgment is to judge that the plaintext information is 1 if the signal value is larger than the threshold value and 0 if the signal value is smaller than the threshold value by comparing the signal value after low-pass filtering with the set threshold value.
The optical chaotic secret communication system based on the dispersion keying of the embodiment realizes the communication process as follows:
1. by setting parameters, the time delay information in the chaotic waveform generated by the master laser and the slave laser is covered by adopting an optical fiber reflector and a filter, so that the confidentiality of the communication process is enhanced, and then the communication process is carried out by inputting the communication information into a phase modulator for phase encryption.
2. The switch connected with the phase modulator is controlled by binary plaintext information, and when the information is 1 or 0, the switch is respectively connected to different light paths, so that different code element symbols are mapped into different chaotic attractors.
3. The transmitting end and the receiving end can be divided into two parts, wherein the first part is the generation of phase chaos, the first parts of the transmitting end and the receiving end are the same, and the second part is the encryption and decryption of signals by utilizing the fiber Bragg grating, so that the conversion from the phase to the intensity is realized, and the intensity chaos waveform is output. The first fiber Bragg grating is used for generating chaotic signals corresponding to binary information '1', the second fiber Bragg grating is used for generating chaotic signals corresponding to binary information '0', the parameter setting of the third fiber Bragg grating is the same as that of the second fiber Bragg grating, two paths of signals of a transmitting end and a receiving end are subtracted in the balanced photoelectric detector, and then information recovery is realized through low-pass filtering and judgment.
The foregoing is a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and those skilled in the art, based on the study idea provided by the present invention, will be able to modify the specific design, and these modifications should also be considered as the scope of the present invention.
Claims (6)
1. The optical chaos secret communication system based on the dispersion keying comprises a transmitting end and a receiving end and is characterized in that a first optical fiber reflector (2-1) of the transmitting end is connected with a first port of a first circulator (3-1) through a first main laser (1-1), a second port of the first circulator (3-2) is connected with a first port of a first optical coupler (5-1) through a first auxiliary laser (4-1), a second port of the first optical coupler (5-1) is connected with a first filter (6-1), and a third port of the first optical coupler (5-1) is connected with a second filter (6-2);
the third port of the first circulator (3-1) is connected with the first port of the first phase modulator (10-1) through a first photoelectric detector (8-1);
the first semiconductor laser (9-1) is connected with a second port of the first phase modulator (10-1), a third port of the first phase modulator (10-1) is connected with a first port of the first fiber Bragg grating (12-1) or a first port of the second fiber Bragg grating (12-2) through a switch (11), a second port of the first fiber Bragg grating (12-1) is connected with a first port of the second optical coupler (5-2), a second port of the second fiber Bragg grating (12-2) is connected with a second port of the second optical coupler (5-2), and a third port of the second optical coupler (5-2), a standard single mode fiber (13), an optical amplifier (14), a dispersion compensating fiber (15) and a first port of the balance photoelectric detector (16) at a receiving end are sequentially connected;
the second optical fiber reflector (2-2) of the receiving end is connected with the first port of the second circulator (3-2) through the second main laser (1-2), the second port of the second circulator (3-2) is connected with the first port of the third optical coupler (5-3) through the second auxiliary laser (4-2), the second port of the third optical coupler (5-3) is connected with the third filter (6-3), and the third port of the third optical coupler (5-3) is connected with the fourth filter (6-4);
the third port of the second circulator (3-2) is connected with the first port of the second phase modulator (10-2) through a second photoelectric detector (8-2);
the second semiconductor laser (9-2) is connected to a second port of the second phase modulator (10-2), a third port of the second phase modulator (10-2) is connected to a second port of the balanced photodetector (16) through a third fiber Bragg grating (12-3), and a third port of the balanced photodetector (16) is connected to the low pass filter (17).
2. The optical chaotic secret communication system based on the dispersion keying according to claim 1, wherein the switch is controlled by binary plaintext information, and when the plaintext information is '1', the switch is connected with the first port of the first fiber bragg grating; when the plaintext information is "0", the switch is connected to the first port of the second fiber Bragg grating.
3. The optical chaotic secret communication system based on the chromatic dispersion keying according to claim 1, wherein the coupling coefficients of the first optical coupler, the second optical coupler and the third optical coupler are all 0.5.
4. A system for optical chaotic secure communication based on dispersion keying according to any of claims 1 to 3, wherein the first master laser and the second master laser employ the same parameters; and/or the first optical fiber reflector and the second optical fiber reflector adopt the same parameters; and/or the first slave laser and the second slave laser adopt the same parameters; and/or the first filter and the third filter adopt the same parameters; and/or the second filter and the fourth filter adopt the same parameters; and/or the first semiconductor laser and the second semiconductor laser adopt the same parameters; and/or the first phase modulator and the second phase modulator employ the same parameters.
5. A system according to any one of claims 1 to 3, wherein the second fibre bragg grating and the third fibre bragg grating use the same parameters.
6. An optical chaotic secret communication method based on dispersion keying, which is based on the optical chaotic secret communication system based on dispersion keying as claimed in claim 1, and is characterized in that the method comprises the following steps:
the transmitting end utilizes a first main laser (1-1) to generate a chaotic light signal I through reflection of a first optical fiber reflector (2-1), a first slave laser (4-1) with a first filter (6-1) and a second filter (6-2) serving as feedback cavities is injected through a first circulator (3-1) to generate a light signal II, the light signal II is converted into a complex entropy source input into a phase modulator through a first photoelectric detector (8-1), and the light wave of the first semiconductor laser (9-1) is subjected to phase modulation to generate a light signal III which is a phase chaotic waveform;
according to different binary plaintext information, the optical signal selects different optical paths after passing through the switch (11), in the first optical path, an optical signal IV is generated through the first fiber Bragg grating (12-1), and in the second optical path, an optical signal V is generated through the second fiber Bragg grating (12-2); the optical signal IV or the optical signal V generates a balanced photoelectric detector (16) of a signal six-input receiving end through a second optical coupler (5-2), a standard single-mode optical fiber (13), an optical amplifier (14) and a dispersion compensation optical fiber (15);
at a receiving end, the second main laser (1-2) generates a chaotic light signal through reflection of a second optical fiber reflector (2-2), the chaotic light signal is injected into a second slave laser (4-2) with a third filter (6-3) and a fourth filter (6-4) serving as feedback cavities through a second circulator (3-2), the optical signal is converted into a complex entropy source input into a phase modulator through a second photoelectric detector (8-2), and the optical wave of the second semiconductor laser (9-2) is subjected to phase modulation to generate an optical signal seven which is a phase chaotic waveform;
the optical signal seven generates an optical signal eight through a third fiber Bragg grating (12-3), the balance photoelectric detector (16) receives the optical signal six from the transmitting end and the optical signal eight from the receiving end to generate an electric signal I, and the electric signal I is subjected to a low-pass filter (17) and threshold judgment to recover plaintext information.
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| CN202311076383.6A Pending CN117118520A (en) | 2023-08-23 | 2023-08-23 | Optical chaotic secret communication system and method based on dispersion keying |
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| CN (1) | CN117118520A (en) |
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