Time delay hiding and frequency spreading system based on laser chaos self-modulation

Abstract

The invention provides a time delay hiding and frequency spreading system based on laser chaos self-modulation and a method for generating laser chaos through employing same. The system comprises a chaos external cavity semiconductor laser and a frequency spreading module. A chaos optical signal generated by the chaos external cavity semiconductor laser passes through the frequency spreading module for frequency spreading conversion, thereby achieving the flat and wide spectrum and the time delay hiding of the laser chaos signal, wherein the frequency spreading module consists of a drive signal, a photoelectric phase modulator and an FBG (Fiber Bragg Grating). The above time delay hiding and frequency spreading system enables the safety of the chaotic communication to be greatly improved.

Description

technical field

[0001] The invention belongs to the technical field of lasers, and more specifically relates to a time delay concealment and frequency spread system based on laser chaotic self-modulation. Background technique

[0002] In recent years, the development of chaotic optical communication technology has become a very active topic, and there are more and more corresponding researches. Chaotic optical communication uses chaos synchronization to realize efficient information encoding and decoding, which is an encryption method based on the physical level. Chaotic optical communication improves the security of communication and becomes a new field in the research of secure communication. However, the researchers found that the current chaotic optical communication system still has security risks. In the external optical feedback semiconductor laser, the feedback delay information of the signal can be obtained by analyzing the chaotic signal through the autocorrelati...

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