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

A spread spectrum system and self-modulation technology, applied in the field of lasers, can solve problems such as limited effective bandwidth, limited communication security, and uneven spectrum, and achieve good noise-like spectral flatness, improved spectral flatness, and improved security. Effect

Active Publication Date: 2018-02-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, most of the energy in the chaotic laser signal spectrum of an external cavity semiconductor laser is concentrated near the relaxation oscillation frequency of the laser, resulting in an uneven spectrum and limited effective bandwidth.
Therefore, as far as external cavity semiconductor lasers are concerned, these two disadvantages limit the security of communication

Method used

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

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Embodiment Construction

[0048] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the present invention. It should be noted that in the following description, when detailed descriptions of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.

[0049] figure 1 It is a principle diagram of a time delay concealment and spread spectrum system based on laser chaotic self-modulation in the present invention.

[0050] In this example, if figure 1 As shown, the present invention is a time delay concealment and spread spectrum system based on laser chaotic self-modulation, which is composed of a chaotic external cavity semiconductor laser and a spread spectrum module;

[0051] Among them, the chaotic external cavity semiconductor laser includes a semiconductor laser MSL, an optical coupler OC, and a mirror M. The semico...

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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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Application Information

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IPC IPC(8): H04B10/50H04B10/556H04B10/85H04B1/69
CPCH04B1/69H04B10/505H04B10/5561H04B10/85
Inventor 江宁王慧赵晓燕
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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