新型三激光器结构的混沌同步特性  

Analysis of Chaos Synchronization in New Three-Laser Scheme

作　　者：申翠丽[1] 叶会英[1] 魏富鹏[1] 李勇[2] 

机构地区：[1]郑州大学信息工程学院,河南郑州450001 [2]云南大学信息学院,云南昆明650091

出　　处：《激光与光电子学进展》2012年第10期104-109,共6页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(60871031)资助课题

摘　　要：设计了一种新型的闭环双向三激光器混沌保密通信系统,驱动激光器基于延时外光反馈,两个参数完全相同的响应激光器在自身延时反馈和驱动激光器的驱动下实现混沌同步。建立了相应的理论模型,研究了系统的分岔特性、同步性以及内部参数失配对其同步性能的影响,并与不含自身光反馈的开环系统进行了比较。研究结果表明,当系统参数满足一定条件时,两个响应激光器的关联极值接近于1,而驱动激光器和响应激光器的相关性很小。与开环系统相比,该系统的载波带宽拓宽了约1.99GHz,对参数失配比较敏感并具有更好的保密性能。A new closed-loop dual-directionally chaotic system with three lasers for private message transmission is proposed. A pair of twin semiconductor lasers as responses are routed into chaos by delayed optical feedback, and chaos synchronization to each other is realized by means of optical injection of a common chaotic-driving signal generated by a drive laser subject to delayed optical feedback. Appropriate model is built. We investigate the bifurcation and synchronization performance and the effect of internal parameter mismatch, and the results are compared with those of the open-loop system in which the response lasers are not subject to local feedback. The theoretical simulations show thatthe maximum value of cross correlation coefficient between two responses approximates to 1, however, the maximum value of cross correlation coefficient for response and driver is very low. Compared with the open-loop system, the bandwidth of the designed system is widened by about 1.99 GHz, and this system becomes more sensitive to parameter mismatch. So the closed-loop scheme offers a better privacy level.

关 键 词：激光器 光混沌 保密通信 混沌同步 参数失配 

分 类 号：TN249[电子电信—物理电子学]