CN114938262A - Chaos secret communication method based on wavelength division multiplexing - Google Patents
Chaos secret communication method based on wavelength division multiplexing Download PDFInfo
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- CN114938262A CN114938262A CN202111527258.3A CN202111527258A CN114938262A CN 114938262 A CN114938262 A CN 114938262A CN 202111527258 A CN202111527258 A CN 202111527258A CN 114938262 A CN114938262 A CN 114938262A
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- chaotic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/001—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols using chaotic signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—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
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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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- Computer Networks & Wireless Communication (AREA)
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- Computer Security & Cryptography (AREA)
- Optics & Photonics (AREA)
- Optical Communication System (AREA)
Abstract
The invention provides a chaotic secure communication implementation method based on wavelength division multiplexing, which comprises a generation method of multi-longitudinal-mode chaotic carrier and a method for modulating and demodulating information. The method for generating the multi-longitudinal-mode chaotic carrier comprises the following steps: broadband laser generation, laser filtering, laser injection and longitudinal mode filtering. The method for modulating the information comprises the following steps: electro-optical modulation, wavelength division multiplexing. The method for demodulating information comprises the following steps: the method comprises the steps of synchronous multi-longitudinal-mode chaotic laser generation, longitudinal-mode filtering, photoelectric detection and digital signal processing. The invention can realize the improvement of the communication safety without changing the prior wavelength division multiplexing communication system.
Description
Technical Field
The invention relates to the field of optical communication, in particular to a chaotic secret communication method based on wavelength division multiplexing.
Background
The laser chaotic encryption technology is a technology applied to optical communication to encrypt a physical layer. With the increasing popularization of optical fiber communication, the requirement of countries or individuals on optical fiber safe transmission is increasingly strong, and how to ensure high-speed transmission of information and realize high-level encryption of the information becomes a problem which needs to be considered in the communication industry. At present, the encryption mode of information in the field of chaotic light communication mainly comprises the following steps: chaotic hiding, chaotic modulation and chaotic keying.
In 2013, a Jiangning team of the university of electronic technology utilizes optical feedback to generate chaotic carriers to realize a chaotic hidden wavelength division multiplexing optical communication system based on chaotic synchronization. In 2020, Lezilian group of Hangzhou electronics science and TECHNOLOGY university proposed a structure of wavelength division multiplexing chaotic modulation optical communication system using co-driven chaotic synchronization. In 2021 (WDM-based bidirectional chemical communication for semiconductor lasers with time delay compensation; Xiaobain Bao; Optics Communications), foreign teams proposed a chaotic modulation scheme based on polarization and wavelength multiplexing. (implementation Analysis of High-Speed Wavelength Division Multiplexing Communication Between Wavelength channel and Optical Fiber Channels Using DP-16QAM Scheme; Dao Vu Anh; ICCE), however, most of the existing Chaotic security Communication schemes are single-channel Communication schemes, and the Wavelength Multiplexing Scheme also uses a single-channel Scheme to increase the number of Channels, but this has a great disadvantage: the devices used (lasers, modulators, etc.) will multiply with the number of channels, which is not cost-effective for the future widespread of secure optical communications.
Therefore, it is necessary to provide a highly secure chaotic secret communication method based on wavelength division multiplexing optical communication.
Disclosure of Invention
The invention aims to improve the safety of chaotic communication, improve the communication speed and be compatible with a wavelength division multiplexing optical communication system. The invention provides a chaotic secret communication method based on wavelength division multiplexing. In order to achieve the purpose of the invention, the invention is mainly realized by the following method:
a chaos secret communication method based on wavelength division multiplexing comprises a method for generating multi-longitudinal mode chaos carrier and a method for modulating and demodulating information;
the method for generating the multi-longitudinal-mode chaotic carrier comprises the following steps: broadband laser generation, laser filtering, laser injection and longitudinal mode filtering.
The method for modulating the information comprises the following steps: electro-optical modulation and wavelength division multiplexing;
the method for demodulating the information comprises the following steps: the method comprises the steps of synchronous multi-longitudinal-mode chaotic laser generation, longitudinal-mode filtering, electro-optical demodulation and digital signal processing. The invention can realize the improvement of the communication safety without changing the prior wavelength division multiplexing communication system;
the method for generating the multi-longitudinal-mode chaotic carrier comprises the following steps: the broadband laser source generates a noise optical signal, the broadband noise optical signal retains a high-power noise optical signal after passing through a filter, the noise optical signal is injected into the multi-longitudinal-mode slave laser, a multi-longitudinal-mode chaotic optical signal is generated in an optical injection mode, and chaotic carriers of different longitudinal modes can be obtained by filtering the multi-longitudinal-mode chaotic optical signal under different wavelengths;
the method for modulating the information comprises the following steps: loading an electric domain signal to be transmitted onto chaotic carriers of different longitudinal modes in a chaotic modulation mode by using an electro-optical modulator, and then performing coupling transmission on the multi-longitudinal mode chaotic secret signal;
the method for demodulating the information comprises the following steps: the method comprises the steps of generating a noise optical signal for a broadband laser source transmitted in a public channel, injecting the noise optical signal into a multi-longitudinal-mode slave laser at a receiving end, generating a multi-longitudinal-mode chaotic optical signal synchronous with a transmitting end in an optical injection mode, filtering the multi-longitudinal-mode chaotic optical signal under different wavelengths, and obtaining chaotic carriers of different longitudinal modes. And carrying out electric domain demodulation on the received secret signal and the chaotic carrier under synchronization through electro-optical conversion, and then carrying out sampling and digital signal processing to recover the transmitted signal loaded on the chaotic carrier.
Preferably, the photoelectric detection in the process of generating and demodulating the multi-longitudinal-mode chaotic secret signal can adopt direct intensity detection or coherent detection;
preferably, the signal for chaotic modulation may use multiple modulation formats such as phase shift keying, amplitude shift keying, etc.;
preferably, the final transmission signal is subjected to electro-optical modulation by the filtered single longitudinal mode chaotic signal to load a transmission sequence.
The existing chaotic secure communication is mostly a single-channel communication scheme, and the wavelength is increased by using the single-channel scheme in wavelength division multiplexing to increase the number of channels, but the method has great disadvantages: the devices used will multiply with the number of channels, which is not cost-effective for the future widespread of secure optical communications. Aiming at the problems, the invention provides a chaotic secret communication scheme which utilizes the characteristics of a multi-longitudinal-mode laser to realize the wavelength division multiplexing and the speed increasing and simultaneously realize the cost reduction.
Drawings
FIG. 1 is a block diagram of a chaotic secure communication method based on wavelength division multiplexing according to the present invention;
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for better illustration of the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent actual sizes;
it will be understood by those skilled in the art that certain well-known descriptions of the figures may be omitted.
The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent;
the technical solution of the present invention is further described with reference to the drawings and the embodiments.
The safety optical communication system mainly comprises a 1-sending end, a 2-receiving end and a 3-transmission optical fiber
Wherein, 1-the sending end adopts the following technical scheme to realize:
the method comprises the following steps: 101-broadband laser source, 102-optical isolator, 103-erbium doped fiber amplifier, 104-optical attenuator, 105-optical circulator, 106-multi-longitudinal mode laser, 107-arrayed waveguide grating, 108-optical modulator, 109-arrayed waveguide grating, 110-arbitrary waveform generator, 111-optical splitter
The transmitting end is mainly used for generating a wavelength division multiplexing safety optical communication signal. The connection relationship of the modules is as follows:
the output end of the 101-broadband laser source is connected with the input end of a 102-optical isolator, the output end of the 102-optical isolator is connected with the input end of a 103-erbium-doped fiber amplifier, the output end of the 103-erbium-doped fiber amplifier is connected with the input end of a 111-optical splitter, the output end of the 111-optical splitter is connected with the input end of a 104-optical attenuator, the output end of the 104-optical attenuator is connected with a port 1 of a 105-optical circulator, and a port 2 of the 105-optical circulator is connected with a port of a 106-multi-longitudinal mode laser. 101-102-103-105-106 constitute a multi-longitudinal-mode optical chaotic generator. The output end of a multi-longitudinal mode chaotic optical signal generated by a 106-multi-longitudinal mode laser is connected with a port 2 of a 105-optical circulator, the multi-longitudinal mode chaotic optical signal is transmitted to the input end of a 107-arrayed waveguide grating through a port 3 of the 105-optical circulator, different optical longitudinal modes can be separated by using the 107-arrayed waveguide grating, and information of a 110-arbitrary waveform generator can be subjected to chaotic modulation on the different optical longitudinal modes through a 108-optical modulator. Then the wavelength division multiplexing is realized by using 109-array waveguide grating. The multi-longitudinal-mode chaotic signal and the signal of the super-radiation laser are transmitted through the two 3-transmission optical fibers.
2-the receiving end comprises:
201-multi longitudinal mode laser, 202-circulator, 203-optical attenuator, 204-arrayed waveguide grating, 205-photodetector, 206-arrayed waveguide grating, 207-photodetector, 208-subtractor.
The optical noise signal of the synchronous superradiation laser received from the 3-transmission optical fiber is connected with the input end of a 203-optical attenuator, the output end of the 203-optical attenuator is connected with a port 1 of a 202-circulator, and a port 2 of the 202-circulator is connected with a 201-multi-longitudinal mode laser. The 201-multi-longitudinal mode laser can generate optical signals with high synchronization degree with the 106-multi-longitudinal mode laser. Port 3 of the 202-circulator is connected with the input end of the 204-arrayed waveguide grating, different optical longitudinal modes can be separated by using the 204-arrayed waveguide grating, and a chaotic modulation optical signal which is received from the 3-transmission optical fiber and loaded with information at the transmitting end is connected with the input end of the 206-arrayed waveguide grating. The 204-arrayed waveguide grating and the 206-arrayed waveguide grating output optical signals of the same-longitudinal mode are respectively connected with the input ends of the 205-photoelectric detector and the 207-photoelectric detector, and the output ends of the 205-photoelectric detector and the 207-photoelectric detector are subtracted by the 208-subtractor to obtain loaded information.
By adjusting the optical power, time delay difference, polarization state and the like of the injected multi-longitudinal mode laser, chaotic signal synchronization of the transmitting and receiving ends can be realized when parameters of the transmitting and receiving ends are matched. After the chaotic signal is modulated by a 108-optical modulator at a transmitting end, the chaotic carrier can carry information, and then after the chaotic signal is transmitted by a 3-transmission optical fiber, the chaotic signal synchronized with a receiving end is subtracted by signals obtained by a 204-arrayed waveguide grating, a 205-photoelectric detector, a 206-arrayed waveguide grating and a 207-photoelectric detector respectively, so that the originally loaded information can be obtained.
Claims (10)
1. The invention provides a chaotic secret communication method based on wavelength division multiplexing, which comprises a generation method of multi-longitudinal-mode chaotic carrier and a method for modulating and demodulating information.
2. The method for generating the multi-longitudinal-mode chaotic carrier comprises the following steps: broadband laser generation, laser filtering, laser injection and longitudinal mode filtering.
3. The method for modulating the information comprises the following steps: electro-optical modulation, wavelength division multiplexing.
4. The method for demodulating the information comprises the following steps: the method comprises the steps of synchronous multi-longitudinal-mode chaotic carrier generation, longitudinal-mode filtering, photoelectric detection and digital signal processing. The invention can realize the improvement of the communication safety without changing the prior wavelength division multiplexing communication system.
5. The method for generating the multi-longitudinal-mode chaotic carrier comprises the following steps: the broadband laser source generates broadband noise optical signals, the broadband noise optical signals retain high-power noise optical signals after passing through the filter, the noise optical signals are injected into the multi-longitudinal-mode slave laser, multi-longitudinal-mode chaotic optical signals are generated in an optical injection mode, and multi-longitudinal-mode chaotic optical signals under different wavelengths are filtered to obtain the multi-longitudinal-mode chaotic carrier.
6. The method for modulating the information comprises the following steps: electric domain signals to be transmitted are loaded on chaotic carriers of different longitudinal modes by an electro-optical modulator in a chaotic modulation mode, and then multi-longitudinal mode chaotic secret signals are subjected to wavelength division multiplexing and then are coupled and transmitted.
7. The method for demodulating the information comprises the following steps: the method comprises the steps of utilizing a broadband laser source transmitted by a public channel to generate broadband noise optical signals to be injected into a multi-longitudinal-mode slave laser at a receiving end, generating multi-longitudinal-mode chaotic optical signals synchronous with a transmitting end in an optical injection mode, and filtering the synchronous multi-longitudinal-mode chaotic optical signals to obtain multi-longitudinal-mode chaotic carriers. And after wave division demultiplexing is carried out on the received multi-longitudinal-mode chaotic secret signal, electric domain demodulation is carried out on the received multi-longitudinal-mode chaotic secret signal and a synchronous multi-longitudinal-mode chaotic carrier after photoelectric detection, and then sampling and digital signal processing are carried out to recover a sending signal loaded on the chaotic carrier.
8. The chaotic secure communication method based on wavelength division multiplexing according to claim 1, wherein the photoelectric detection in the demodulation process of the multi-longitudinal-mode chaotic secure signal can be direct intensity detection or coherent detection.
9. The chaotic secure communication method based on wavelength division multiplexing according to claim 1, wherein the electrical signal for chaotic modulation may adopt a bi-level or multi-level bipolar code, that is, chaotic secure signals of various modulation formats such as phase shift keying, amplitude shift keying, and the like can be generated.
10. The chaotic secure communication method based on wavelength division multiplexing according to claim 1, wherein a final transmission signal is subjected to electro-optical modulation by a filtered single longitudinal mode chaotic carrier to load a transmission sequence.
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| CN202111527258.3A CN114938262A (en) | 2021-12-14 | 2021-12-14 | Chaos secret communication method based on wavelength division multiplexing |
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| CN202111527258.3A CN114938262A (en) | 2021-12-14 | 2021-12-14 | Chaos secret communication method based on wavelength division multiplexing |
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