A bidirectional multipath chaotic laser communication system and a communication method

Abstract

The invention discloses a bidirectional multi-channel chaotic laser communication system and a communication method, and the method comprises the steps: injecting a beam of continuous laser into an isolator-free multi-longitudinal-mode semiconductor laser with external cavity random grating feedback, and achieving the spectrum broadening of multi-mode chaotic laser without delay characteristics; Adjusting the wavelength of the injected light to regulate and control the chaotic laser spectrum bandwidth output by the isolator-free multi-longitudinal-mode semiconductor laser and the chaotic laserspectrum bandwidth of each sub-mode of the isolator-free multi-longitudinal-mode semiconductor laser, and separating the chaotic laser spectrum bandwidth by using a wavelength division multiplexer according to the longitudinal-mode wavelength to serve as a chaotic laser carrier for multi-channel communication; And dividing the obtained chaotic laser with wide frequency spectrum, multimode and notime delay characteristics into three paths through two couplers to form two closed-loop structures which are respectively used for realizing forward and reverse multi-path information loading transmission demodulation. According to the invention, two lasers are not needed to generate synchronous chaotic laser, the system structure is simplified, the bidirectional multi-channel information safetycommunication capability can be realized, and the function of simultaneously loading information at different rates can be realized.

Description

technical field [0001] The invention relates to the field of broadband chaotic laser communication, in particular to a two-way multi-channel chaotic laser communication system and a communication method, which can be used for chaotic laser wavelength division multiplexing secure communication. Background technique [0002] Chaotic laser has the characteristics of initial value sensitivity, unpredictability, wide spectrum, high energy, etc., which makes it have very 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 used chaotic laser broadband and large amplitude characteristics to apply it to chaotic optical secure transmission, and have successfully realized 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 10Gb / s[IEEE J. Quantum Electron., V...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the information rate in the current chaotic secure communication system is limited by the spectral bandwidth of the synchronous chaotic laser and the chaotic laser generated by the feedback of the traditional external cavity has the characteristics of external cavity time delay, a two-way multi-channel chaotic laser communication system and The communication method is a chaotic secure communication system with adjustable spectral bandwidth of chaotic lasers, no external cavity delay characteristics, and can be used for simultaneous loading of two-way multi-channel information at different rates

Images