CN102882608B - Chaotic quadrature multiplexing secure optical fiber communication device and method - Google Patents
Chaotic quadrature multiplexing secure optical fiber communication device and method Download PDFInfo
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- CN102882608B CN102882608B CN201210350031.0A CN201210350031A CN102882608B CN 102882608 B CN102882608 B CN 102882608B CN 201210350031 A CN201210350031 A CN 201210350031A CN 102882608 B CN102882608 B CN 102882608B
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Abstract
The invention provides a chaotic quadrature multiplexing secure optical fiber communication device and method. Information is combined together with DC offset signals of lasers into one signal after passing through bias devices, and then the signal enters the lasers; chaotic light generated by the N lasers is combined into one signal after passing through an optical coupler, and the signal is then split into N+1 paths by the optical coupler, N paths are fed back to the lasers by optical fiber delay lines and optical circulators, and the rest one path enters optical fiber transmission; the signal passing through the optical coupler is divided into N+1 paths, the N paths respectively enter the N lasers, while the rest one path directly enters a photoelectric detector; the outputs of the lasers of a receiver are respectively sent to anti-phase photoelectric detectors; output signals of all the photoelectric detectors are combined into one signal by an RF (Radio Frequency) coupler, which is then sent to bandpass filters; and the parameters of the filters can be adjusted to obtain demodulated information. According to the invention, the dimensionality of optical fiber multiplexing communication is increased, the amount of multiplexing channels is increased and the optical fiber bandwidth can be made the best use of.
Description
Technical field
The invention belongs to fiber optic communication field, relate to the secret fiber optic communications devices of a kind of chaos orthogonal multiplex and method, particularly utilize a full optical chaos orthogonal multiplex secure communication device for distributed feedback type semiconductor laser, belong to information security, military affairs and technical field of optical fiber communication.
Background technology
Information security has become a National Security Strategy that can not be ignored concerning national politics, economy, military affairs and social safety, stability and development.The problems such as the data message in Internet Transmission, storage, processing procedure is lost, reveal or illegally distorted are day by day serious in recent years, cause serious impact to society and economy.Certainly, the safety issue of communication all has important current demand and long-range strategic importance for the stable of our economy, our society and our politics and development.
Chaotic laser light communication is a kind of technology be encrypted existing fiber communication system in physical layer, has the advantages such as enciphering rate is fast, real-time good, difficult decoding.Wherein, by means of the chaotic laser light communication that semiconductor laser realizes, have cost low, be with roomy, enciphering rate fast, with the existing optical communication advantage such as compatibility mutually, be a kind of technology having using value.
Chaotic laser light secure communication needs with existing optical fiber communication compatible, can avoid like this laying special communication line in addition, only just need can realize chaotic laser light secure communication by existing optic communication links and chaos optical transceiver.Therefore, there is chaotic laser light secure communication and the multiplexing problem of existing optical fiber communication, its realization both can solve multiple user and utilize same optical fiber transmission information simultaneously, effectively can excavate again and utilize bandwidth of an optical fiber resource, saving equipment and cost.In first technology [1] (see J. Z. Zhang, et al. Wavelength division multiplexing of chaotic secure and fiber-optic communications, Opt. Express 2009. A. Argyris, et al. Transmission effects in wavelength division multiplexed chaotic optical communication systems, J. Lightwave Technol. 2010) disclose a kind of wavelength division multiplexing method of a road chaotic laser light communication channel and a road convention optical communication channel, it is formed is that chaotic laser light channel and convention optical communication channel are combined into a road through wavelength division multiplexer or coupler and enter Optical Fiber Transmission, two paths of signals is separated through Wave decomposing multiplexer at receiving terminal, carry out demodulation respectively.In first technology [2] (see Q. Zhao and H. Yin, Performance analysis of dense wavelength division multiplexing secure communications with multiple chaotic optical channels, Opt. Commun. 2012) disclose the device of dense wave division multipurpose between a kind of multichannel chaos optical channel, its formation Shi Ge road chaotic laser light channel is combined into a road through wavelength division multiplexer and enters Optical Fiber Transmission, at receiving terminal through Wave decomposing multiplexer by each road signal separately, demodulation is carried out respectively.These two kinds of technology all have employed wavelength-division multiplex technique, realize the multiplexing secure communication of chaos in optical fiber.But optical fiber has abundant bandwidth resources, if multiplexing ability can be increased further on the basis of chaotic laser light wavelength division multiplexing, by utilizing the resource of optical fiber more fully, have a extensive future.The technology can widening chaotic laser light wavelength division multiplexing is an orthogonal multiplex, and namely each channel adopts orthogonal carrier transmission information, and the centre wavelength of carrier wave is all identical.At first technology [3] (D. Rontani, et al. Spectrally efficient multiplexing of chaotic light, Opt. Lett. 2010.) disclose the device that in a kind of free space, chaos orthogonal multiplex is synchronous, it forms Shi Ge road chaotic carrier and is coupled as a road through beam splitter, signal after coupling is wherein a branch of feeds back to each transmitter laser after speculum, forms delay of feedback; Another bundle transfers to receiver, thus realize coupling transmitter and receiver between synchronous.Its weak point is that this device cannot realize under optic fibre environment, and does not provide the loading of information and the method for demodulation.
Summary of the invention
The object of the present invention is to provide a kind of secret fiber optic communications devices of chaos orthogonal multiplex based on distributed feedback type semiconductor laser and method.To add the dimension in optical fiber multiplexing communication, thus increase multiplexing number of passages, utilize bandwidth of an optical fiber resource more fully.
The secret fiber optic communications devices of chaos orthogonal multiplex based on distributed feedback type semiconductor laser provided by the invention comprises T bias device, distributed feedback type semiconductor laser, optical circulator, N × 1 optical coupler, 1 × (N+1) optical coupler, fibre delay line, optical fiber, photodetector, anti-phase photodetector, (N+1) × 1 radio-frequency (RF) coupler and band pass filter.
The above-mentioned secret fiber optic communications devices of chaos orthogonal multiplex is used for the method for the secret optical fiber communication of chaos orthogonal multiplex, and concrete scheme is as follows:
User profile is combined into a road signal with the DC bias signal of laser after T-shaped bias device, then distributed feedback type semiconductor laser is entered, the chaos light that N number of distributed feedback type semiconductor laser produces is combined into a road signal after the optical coupler of N × 1, be divided into N+1 road through 1 × (N+1) optical coupler again, N road wherein feeds back to distributed feedback type semiconductor laser through fibre delay line and optical circulator; And another road enters Optical Fiber Transmission, after 1 × (N+1) optical coupler, signal is divided into N+1 road, wherein N road enters N number of distributed feedback type semiconductor laser respectively, and another road directly enters photodetector, anti-phase photodetector is delivered in the output of receiver distributed feedback type semiconductor laser respectively, the output signal of photodetector and each anti-phase photodetector is combined into a road signal through radio-frequency (RF) coupler, then band pass filter is sent into, by the parameter of accommodation zone bandpass filter, obtain the information demodulated.
The secret fiber optic communications devices of chaos orthogonal multiplex based on distributed feedback type semiconductor laser that the present invention proposes and method and at first Technical comparing, there is following characteristics: the present invention adopts orthogonal multiplex technology, relative to wavelength-division multiplex technique, the wavelength resource of optical fiber can be saved further, increase the number of users of chaotic laser light communication.Receiving system is simple, and the demodulation performance of information only depends on receiving terminal band pass filter.Be orthogonal between each chaotic carrier, the crosstalk between signal is little, and chaotic carrier has the feature of noise like, good confidentiality.
Accompanying drawing explanation
Accompanying drawing is the secret fiber optic communications devices schematic diagram of chaos orthogonal multiplex of the present invention.
In figure: 1 laser DC bias signal; 2T bias device; 3 user profile;
4 distributed feedback type semiconductor lasers; 5 optical circulators; 6 N × 1 optical couplers;
71 × (N+1) optical couplers; 8 fibre delay lines; 9 optical fiber; 10 photodetectors;
11 anti-phase photodetectors; 12 (N+1) × 1 radio-frequency (RF) coupler; 13 band pass filters;
14 information demodulated.
Embodiment
As shown in Figure 1, be the structural representation of the secret optical fiber communication of chaos orthogonal multiplex of distributed feedback type semiconductor laser of the present invention, this device can realize the orthogonal multiplexing secret optical fiber communication of each transmitter chaos light carrier.
Described transmitting terminal is made up of signal load unit (comprising laser DC bias signal 1, T bias device 2 and user profile 3), distributed feedback type semiconductor laser 4 and fiber optic loop feedback module (comprising optical circulator 5, N × 1 optical coupler 6,1 × (N+1) optical coupler 7, fibre delay line 8).Fiber optic loop feedback module forms feedback loop, makes distributed feedback type semiconductor laser 4 produce chaotic carrier.Laser DC bias signal 1 and user profile 3 are coupled as a road by T bias device 2, and the other end of T bias device is connected on distributed feedback type semiconductor laser 4.The information 3 of user is contained in the light signal that now distributed feedback type semiconductor laser 4 exports.
Described fiber optic loop feedback module forms by with lower component:
Optical circulator 5: form optical fiber feedback loop;
N × 1 optical coupler 6: N road chaotic carrier is combined into a road signal;
1 × (N+1) optical coupler 7: the chaotic signal after coupling is divided into N+1 road, and wherein N road feeds back to N number of distributed feedback type semiconductor laser 4, and a remaining road feeding optical fiber 9 transmits;
Fibre delay line 8: regulate the chamber of fiber optic loop feedback cavity long, realize the orthogonal of chaotic carrier.
Described receiving terminal forms by with lower component:
1 × (N+1) optical coupler 7: the light signal in optical fiber 9 is divided into N+1 road;
Photodetector 10: the light signal in fiber channel is become the signal of telecommunication;
Distributed feedback type semiconductor laser 4: produce the chaotic carrier synchronous with transmitter distributed feedback type semiconductor laser;
Anti-phase photodetector 11: anti-phase photodetector is used for chaos light signal to become the anti-phase signal of telecommunication;
(N+1) × 1 radio-frequency (RF) coupler 12: the signal of telecommunication that N+1 photodetector exports is combined into a road, and the signal after this coupling only comprises N road information and do not comprise chaotic carrier;
Band pass filter 13: the information leaching user;
The information 14 demodulated: the user profile that receiving terminal demodulates.
Claims (2)
1. the secret fiber optic communications devices of chaos orthogonal multiplex, it is a kind of secret fiber optic communications devices of chaos orthogonal multiplex based on distributed feedback type semiconductor laser, comprise T bias device (2), distributed feedback type semiconductor laser, optical circulator (5), N × 1 optical coupler (6), 1 × (N+1) optical coupler (7), fibre delay line (8), optical fiber (9), photodetector (10), anti-phase photodetector (11), (N+1) × 1 radio-frequency (RF) coupler (12) and band pass filter (13), it is characterized in that: T bias device (2) is connected with the first distributed feedback type semiconductor laser (4), the output of the first distributed feedback type semiconductor laser (4) is connected with optical circulator (5), optical circulator (5) one end is connected with N × 1 optical coupler (6) and the other end is connected with fibre delay line (8), one 1 × (N+1) optical coupler (7) one end is connected with N × 1 optical coupler (6) and the other end is connected with fibre delay line (8) and optical fiber (9), the other end and the 21 × (N+1) optical coupler (7) of optical fiber (9) is connected, 21 × (N+1) optical coupler (7) is connected with photodetector (10) and the second distributed feedback type semiconductor laser (4), second distributed feedback type semiconductor laser (4) connects anti-phase photodetector (11), (N+1) × 1 radio-frequency (RF) coupler (12) one end is connected and other end connecting band bandpass filter (13) with photodetector (10) and anti-phase photodetector (11).
2. the secret fiber optic communications devices of chaos orthogonal multiplex according to claim 1 is used for the method for the secret optical fiber communication of chaos orthogonal multiplex, it is characterized in that, user profile (3) is combined into a road signal with the DC bias signal (1) of laser after T-shaped bias device (2), then the first distributed feedback type semiconductor laser (4) is entered, the chaos light that N number of first distributed feedback type semiconductor laser (4) produces is combined into a road signal after N × 1 optical coupler (6), N+1 road is divided into again through the one 1 × (N+1) optical coupler (7), N road wherein feeds back to the first distributed feedback type semiconductor laser (4) through fibre delay line (8) and optical circulator (5), and another road enters optical fiber (9) transmission, after the 21 × (N+1) optical coupler (7), signal is divided into N+1 road, wherein N road enters N number of second distributed feedback type semiconductor laser (4) respectively, and another road directly enters photodetector (10), anti-phase photodetector (11) is delivered in the output receiving the second distributed feedback type semiconductor laser (4) respectively, the output signal of photodetector (10) and each anti-phase photodetector (11) is combined into a road signal through radio-frequency (RF) coupler (12), then band pass filter (13) is sent into, by the parameter of accommodation zone bandpass filter (13), obtain the information (14) demodulated.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103260095B (en) * | 2013-05-31 | 2016-03-23 | 电子科技大学 | A kind of secret EPON based on Chaotic Synchronous |
| CN104065421B (en) * | 2014-06-30 | 2016-08-24 | 电子科技大学 | A kind of wavelength saltus step Development of Chaotic Secure Communication Method based on multimode laser and system |
| CN104600560B (en) * | 2015-01-20 | 2018-09-04 | 中国科学院半导体研究所 | Broadband chaos optical transmitting set based on Integrated-External Cavity Semiconductor Laser |
| CN106027224B (en) * | 2016-08-01 | 2017-02-22 | 西南大学 | Secure communication system based on photoelectric feedback ring laser |
| CN111313978B (en) * | 2020-02-24 | 2022-07-26 | 电子科技大学 | Physical layer secret optical fiber communication system based on chaos spectrum phase encryption |
| CN111277337B (en) * | 2020-02-24 | 2022-07-26 | 电子科技大学 | Physical layer secret optical fiber communication system based on chaos phase encryption |
| CN114337832B (en) * | 2021-12-22 | 2024-02-09 | 杭州电子科技大学 | Key control optical chaos communication system based on chaos coding |
| CN114944875B (en) * | 2022-05-06 | 2023-05-16 | 中国地质大学（武汉） | Super-orthogonal electro-optical chaotic secret communication system and communication method |
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| CN101068130A (en) * | 2007-05-24 | 2007-11-07 | 上海大学 | Optical privacy communication system and securing method |
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Patent Citations (2)
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| CN101068130A (en) * | 2007-05-24 | 2007-11-07 | 上海大学 | Optical privacy communication system and securing method |
| CN102347832A (en) * | 2011-08-18 | 2012-02-08 | 西南交通大学 | Multi-channel chaotic synchronization communication system in simple topologcial structure |
Non-Patent Citations (3)
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| Long-haul dense wavelength division multiplexing between a chaotic optical secure channel and a conventional fiber-optic channel;Qingchun Zhao, et al,.;《APPLIED OPTICS》;20120801;第51卷(第22期);全文 * |
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