Bidirectional chaotic secure communication system based on TWDM-PON and communication method

Abstract

The invention discloses a bidirectional chaotic secure communication system based on TWDM-PON and a communication method. A beam of continuous laser is injected into an isolator-free multi-longitudinal mode semiconductor laser with external cavity random grating feedback, thereby realizing spectrum broadening of multi-mode chaotic laser without delay feature; the light is divided into multiple paths through a multipath light splitter, three paths form one group, each group is connected with a forward multipath information loading transmission demodulation part and a backward multipath information loading transmission demodulation part; the chaotic laser is separated according to the longitudinal-mode wavelength by using a wave-division multiplexer so as to be used as the chaotic laser carrier of multipath communication; three paths of each group form two closed-loop structures for realizing forward multipath information loading transmission demodulation and backward multipath information loading transmission demodulation. The multiuser directional secure communication can be realized, and the high-speed information can be loaded, the user amount is greatly improved, and the user demand is satisfied.

Description

technical field [0001] The invention relates to the field of broadband chaotic laser communication, in particular to a bidirectional chaotic secure communication system and communication method based on TWDM-PON, which can be used for chaotic laser wavelength division multiplexing secure communication. Background technique [0002] Chaos laser has the characteristics of sensitive initial value, unpredictable, wide spectrum, high energy, etc., which makes it have important applications in the field of information security. For example, chaotic secure communication, high-speed true random code generation, etc. In the research of chaotic secure communication, people have applied the chaotic laser to secure transmission of chaotic light by taking advantage of its broadband and large-scale characteristics, and have successively achieved a one-way information rate of 1Gb / s [Nature, Vol. 17, p. 348 , 2005], 2.5 Gb / s [Opt. Express, Vol. 18, p. 5188-5198, 2010] and 10 Gb / s [IEEE J. ...

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Problems solved by technology

[0006] In order to solve the current chaotic secure communication system, dense wavelength division multiplexing (WDM-PON) can improve the bandwidth of users, but limited by the number of WDM wavelength divisions, it still cannot meet the high-speed secure communication needs of a large number of users problem, providing a two-way chaotic secure communication system and communication method based on TWDM-PON

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