色散光反馈半导体激光器产生无周期混沌激光

项目名称： 色散光反馈半导体激光器产生无周期混沌激光

项目编号： No.61475111

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 无线电电子学、电信技术

项目作者： 王安帮

作者单位： 太原理工大学

项目金额： 83万元

中文摘要： 混沌光的宽带、大幅、无规则的振荡特性使其在保密通信、高速密钥产生、反告警雷达等领域具有重要应用价值。外腔反馈半导体激光器，因结构简单、操作灵活（外部反射镜构成反馈外腔）成为最常用的混沌光源。但镜面的线性反馈形成外腔谐振，导致混沌光蕴含周期性。该周期性既恶化混沌波形的随机性，又泄漏了外腔长度信息、降低了混沌系统的安全性。增加反射镜数量、调制外腔长度等方法，可一定程度地抑制周期性，但并未改变外腔谐振的本质，且结构较复杂。 本项目提出一种新型反馈方式，采用色散元件如啁啾光纤光栅、色散光纤等取代反射镜，使反馈光色散，形成非线性反馈，从而产生无周期的混沌激光。项目将研究色散光反馈半导体激光器的动力学特性及物理机理，探寻简单有效的反馈方案，并揭示抑制外腔谐振、产生无周期混沌的机理和规律。本项目的实施可为上述混沌应用领域提供高复杂度、安全、可靠的宽带混沌源，还将丰富并激发时延反馈动力学领域的原创性研究。

中文关键词： 混沌激光；半导体激光器；色散；无周期；反馈

英文摘要： It has been demonstrated that optical chaos has significant applications in many fields such as secure communication, high-speed key generation, and anti-warning radar due to its broadband, sharp and irregular oscillation characteristics. External cavity feedback semiconductor laser is the common source of broadband chaotic light because of its simple configuration and flexible operation (the feedback cavity consists of an external reflecting mirror). However, external cavity feedback semiconductor laser has a serious security flaw. The oscillations in the external cavity generated by linear feedback from the mirror cause the periodicity of the optical chaos. The periodicity can deteriorate randomness of chaotic waveform and disclose the length information of external cavity, thus the chaotic system is in the risk of crack. Increasing cavity number or modulating cavity length can depress the periodicity to a certain extent, but it complicates the system structure. In this project, we propose a novel feedback scheme in which chromatic dispersion components, such as a chirped fiber grating and chromatic dispersion fiber, are utilized as reflector instead of mirror, and the nonlinear feedback caused by feedback light dispersion generates non-period chaotic laser. We will study the nonlinear dynamics and the physical mechanism of the chromatic dispersion feedback semiconductor laser, explore simple and effective feedback schemes and find out the mechanism and rules to depress the oscillations in the external cavity and generate the non-period chaotic laser. It will also provide a complicated and secure chaotic light source for the various chaos-based applications and enrich the original research on the time delay feedback dynamics.

英文关键词： chaotic laser;semiconductor laser;chromatic dispersion;non-period;feedback