CN102882608A - 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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- CN102882608A CN102882608A CN2012103500310A CN201210350031A CN102882608A CN 102882608 A CN102882608 A CN 102882608A CN 2012103500310 A CN2012103500310 A CN 2012103500310A CN 201210350031 A CN201210350031 A CN 201210350031A CN 102882608 A CN102882608 A CN 102882608A
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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 a kind of full optical chaos orthogonal multiplex secure communication device that utilizes distributed feedback type semiconductor laser belongs to information security, military affairs and technical field of optical fiber communication.
Background technology
Information security has become concerning national politics, economy, military affairs and social safety, a National Security Strategy that can not be ignored of stability and development.It is day by day serious in recent years that data message in Internet Transmission, storage, the processing procedure such as loses, reveals or illegally distorted at the problem, society and economy caused seriously influence.Undoubtedly, the safety issue of communication all has important current demand and long-range strategic importance for the stable and development of our economy, our society and our politics.
Chaotic laser light communication be a kind of in physical layer to the technology that the existing fiber communication system is encrypted, have that enciphering rate is fast, real-time good, an advantage such as difficult decoding.Wherein, by means of the chaotic laser light communication that semiconductor laser is realized, have cost low, be with roomy, enciphering rate fast, with the existing optical communication advantage such as compatibility mutually, be a kind of technology that has using value.
The chaotic laser light secure communication need to be compatible with existing optical fiber communication, can avoid like this laying in addition special communication line, only needs just can realize the chaotic laser light secure communication by existing optic communication links and chaos optical transceiver.Therefore, exist the multiplexing problem of chaotic laser light secure communication and existing optical fiber communication, its realization both can solve a plurality of users and utilize simultaneously transmission information of same optical fiber, can effectively excavate and utilize bandwidth of an optical fiber resource, saving equipment and cost again.Formerly technology [1] is (referring to 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) the wavelength division multiplexing method of a kind of one road chaotic laser light communication channel and one tunnel conventional optical communication channel disclosed, to be chaotic laser light channel and conventional optical communication channel be combined into one the tunnel through wavelength division multiplexer or coupler to its formation enters Optical Fiber Transmission, two paths of signals is separated through Wave decomposing multiplexer at receiving terminal, carry out respectively demodulation.Formerly technology [2] is (referring to Q. Zhao and H. Yin, Performance analysis of dense wavelength division multiplexing secure communications with multiple chaotic optical channels, Opt. Commun. 2012) device of dense wave division multipurpose between a kind of multichannel chaos optical channel disclosed, its formation is that each road chaotic laser light channel is combined into one the tunnel through wavelength division multiplexer and enters Optical Fiber Transmission, at receiving terminal through Wave decomposing multiplexer with each road signal separately, carry out respectively demodulation.These two kinds of technology have all adopted wavelength-division multiplex technique, realize the multiplexing secure communication of chaos in the optical fiber.Yet optical fiber has abundant bandwidth resources, if can further increase multiplexing ability on the basis of chaotic laser light wavelength division multiplexing, with utilizing more fully the resource of optical fiber, has a extensive future.A kind of technology that can widen the chaotic laser light wavelength division multiplexing is orthogonal multiplex, and namely each channel adopts the carrier transmission information of quadrature, and the centre wavelength of carrier wave is all identical.Technology [3] (D. Rontani formerly, et al. Spectrally efficient multiplexing of chaotic light, Opt. Lett. 2010.) the synchronous device of chaos orthogonal multiplex in a kind of free space disclosed, its formation is that each road chaotic carrier is coupled as one the tunnel through beam splitter, signal after the coupling is a branch of each transmitter laser that feeds back to behind speculum wherein, consists of delay of feedback; Another bundle transfers to receiver, thus realize between the transmitter and receiver of coupling synchronously.Its weak point is that this device can't be realized under optic fibre environment, and does not provide the method for loading and the demodulation of information.
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 and method based on distributed feedback type semiconductor laser.Having increased the dimension in the optical fiber multiplexing communication, thereby increase multiplexing number of passages, utilize more fully the bandwidth of an optical fiber resource.
The secret fiber optic communications devices of chaos orthogonal multiplex based on distributed feedback type semiconductor laser provided by the invention comprises T biasing 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 one road signal with the direct current biasing signal of laser behind T-shaped biasing device, then enter distributed feedback type semiconductor laser, the chaos light of N distributed feedback type semiconductor laser generation is combined into one road signal behind N * 1 optical coupler, be divided into the 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, signal is divided into the N+1 road behind 1 * (N+1) optical coupler, wherein the N road enters respectively N distributed feedback type semiconductor laser, and another road directly enters photodetector, anti-phase photodetector is delivered to respectively in the output of receiver distributed feedback type semiconductor laser, the output signal of photodetector and each anti-phase photodetector is combined into one road signal through radio-frequency (RF) coupler, then send into band pass filter, by the parameter of accommodation zone bandpass filter, the information that obtains demodulating.
The secret fiber optic communications devices of chaos orthogonal multiplex and method and formerly technology comparison based on distributed feedback type semiconductor laser that the present invention proposes, have following characteristics: the present invention adopts the orthogonal multiplex technology, with respect to wavelength-division multiplex technique, can further save the wavelength resource of optical fiber, increase the number of users of chaotic laser light communication.Receiving system is simple, and the demodulation performance of information only depends on the receiving terminal band pass filter.Be quadrature between each chaotic carrier, crosstalking between the signal is little, and chaotic carrier has the characteristics of noise like, good confidentiality.
Description of drawings
Accompanying drawing is the secret fiber optic communications devices schematic diagram of chaos orthogonal multiplex of the present invention.
Among the figure: 1 laser direct current biasing signal; The 2T device of setovering; 3 user profile;
4 distributed feedback type semiconductor lasers; 5 optical circulators; 6 N * 1 optical coupler;
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 that demodulate.
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 be realized the multiplexing secret optical fiber communication of each transmitter chaos light carrier quadrature.
Described transmitting terminal is comprised of signal load unit (comprising laser direct current biasing signal 1, T biasing 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).The fiber optic loop feedback module consists of feedback loop, makes distributed feedback type semiconductor laser 4 produce chaotic carrier.Laser direct current biasing signal 1 is coupled as one the tunnel with user profile 3 by T biasing device 2, and the other end of T biasing device is connected on the distributed feedback type semiconductor laser 4.The information 3 that has comprised the user in the light signal of distributed feedback type semiconductor laser 4 outputs this moment.
Described fiber optic loop feedback module is by forming with lower member:
Optical circulator 5: consist of the optical fiber feedback loop;
N * 1 optical coupler 6: N road chaotic carrier is combined into one road signal;
1 * (N+1) optical coupler 7: the chaotic signal after will being coupled is divided into the N+1 road, and wherein the N road feeds back to N distributed feedback type semiconductor laser 4, and remaining a road send into optical fiber 9 transmission;
Fibre delay line 8: the chamber of regulating the fiber optic loop feedback cavity is long, realizes the quadrature of chaotic carrier.
Described receiving terminal is by forming with lower member:
1 * (N+1) optical coupler 7: the light signal in the optical fiber 9 is divided into the N+1 road;
Photodetector 10: the light signal in the fiber channel is become the signal of telecommunication;
Distributed feedback type semiconductor laser 4: produce the chaotic carrier synchronous with the transmitter distributed feedback type semiconductor laser;
Anti-phase photodetector 11: anti-phase photodetector is used for the chaos light signal is become the anti-phase signal of telecommunication;
(N+1) * 1 radio-frequency (RF) coupler 12: the signal of telecommunication of N+1 photodetector output is combined into one the tunnel, and the signal after this coupling only comprises N road information and does not comprise chaotic carrier;
Band pass filter 13: the information that leaches the user;
The information 14 that demodulates: the user profile that receiving terminal demodulates.
Claims (2)
1. 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 biasing device (2), distributed feedback type semiconductor laser (4), 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 biasing device (2) is connected with distributed feedback type semiconductor laser (4), the output of distributed feedback type semiconductor laser (4) is connected with optical circulator (5), the other end is connected with fibre delay line (8) optical circulator (5) one ends with N * 1 optical coupler (6) is connected, the other end is connected with fibre delay line (6) and optical fiber (9) 1 * (N+1) optical coupler (5) one ends with N * 1 optical coupler (4), the other end of optical fiber (9) is connected with 1 * (N+1) optical coupler (7), 1 * (N+1) optical coupler (7) is connected with photodetector (10) and distributed feedback type semiconductor laser (4), distributed feedback type semiconductor laser (4) connects anti-phase photodetector (11), (N+1) * 1 radio-frequency (RF) coupler (12) one ends and photodetector (10) and anti-phase photodetector (11) and other end connecting band bandpass filter (13).
2. the secret fiber optic communications devices of chaos orthogonal multiplex claimed in 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 one road signal with the direct current biasing signal (1) of laser behind T-shaped biasing device (2), then enter distributed feedback type semiconductor laser (4), the chaos light that N distributed feedback type semiconductor laser (4) produces is combined into one road signal through N * 1 optical coupler after (6), be divided into the N+1 road through 1 * (N+1) optical coupler (7) again, N road wherein feeds back to distributed feedback type semiconductor laser (4) through fibre delay line (8) and optical circulator (5); And another road enters optical fiber (9) transmission, signal is divided into the N+1 road behind 1 * (N+1) optical coupler (7), wherein the N road enters respectively N distributed feedback type semiconductor laser (4), and another road directly enters photodetector (10), anti-phase photodetector (11) is delivered to respectively in the output of receiver distributed feedback type semiconductor laser (4), the output signal of photodetector (10) and each anti-phase photodetector (11) is combined into one road signal through radio-frequency (RF) coupler (12), then send into band pass filter (13), by the parameter of accommodation zone bandpass filter (13), the information that obtains demodulating (14).
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| CN103260095A (en) * | 2013-05-31 | 2013-08-21 | 电子科技大学 | Classified passive optical network based on synchronization of chaos |
| CN104065421A (en) * | 2014-06-30 | 2014-09-24 | 电子科技大学 | Wavelength-hopping chaotic secure communication method and system based on multi-mode lasers |
| CN104600560A (en) * | 2015-01-20 | 2015-05-06 | 中国科学院半导体研究所 | Broadband chaotic light emitter based on integrated external-cavity semiconductor laser unit |
| CN106027224A (en) * | 2016-08-01 | 2016-10-12 | 西南大学 | Secure communication system based on photoelectric feedback ring laser |
| CN111277337A (en) * | 2020-02-24 | 2020-06-12 | 电子科技大学 | Physical layer secret optical fiber communication system based on chaos phase encryption |
| CN111313978A (en) * | 2020-02-24 | 2020-06-19 | 电子科技大学 | Physical layer secret optical fiber communication system based on chaos spectrum phase encryption |
| CN114337832A (en) * | 2021-12-22 | 2022-04-12 | 杭州电子科技大学 | Chaos coding based keying optical chaos communication system |
| CN114944875A (en) * | 2022-05-06 | 2022-08-26 | 中国地质大学（武汉） | Super-orthogonal electro-optical chaotic secret communication system and communication method |
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Cited By (13)
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| CN103260095A (en) * | 2013-05-31 | 2013-08-21 | 电子科技大学 | Classified passive optical network based on synchronization of chaos |
| CN104065421A (en) * | 2014-06-30 | 2014-09-24 | 电子科技大学 | Wavelength-hopping chaotic secure communication method and system based on multi-mode lasers |
| 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 |
| CN104600560A (en) * | 2015-01-20 | 2015-05-06 | 中国科学院半导体研究所 | Broadband chaotic light emitter based on integrated external-cavity semiconductor laser unit |
| CN106027224A (en) * | 2016-08-01 | 2016-10-12 | 西南大学 | Secure communication system based on photoelectric feedback ring laser |
| CN111313978A (en) * | 2020-02-24 | 2020-06-19 | 电子科技大学 | Physical layer secret optical fiber communication system based on chaos spectrum phase encryption |
| CN111277337A (en) * | 2020-02-24 | 2020-06-12 | 电子科技大学 | Physical layer secret optical fiber communication system based on chaos phase encryption |
| 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 |
| CN114337832A (en) * | 2021-12-22 | 2022-04-12 | 杭州电子科技大学 | Chaos coding based keying optical chaos communication system |
| 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 |
| CN114944875A (en) * | 2022-05-06 | 2022-08-26 | 中国地质大学（武汉） | Super-orthogonal electro-optical chaotic secret communication system and communication method |
| 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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