基于动态参数的光电延迟振荡系统及其保密通信研究  

Chaos Generation of Variable Parameters and Secure Communication Based on Optoelectronic Feedback Oscillation

作　　者：胡汉平[1] 苏威[1] 于志良[1] 刘凌锋[1] 

机构地区：[1]华中科技大学图像识别与人工智能研究所,湖北武汉430074

出　　处：《光学学报》2013年第5期54-60,共7页Acta Optica Sinica

基　　金："十二五"国家密码基金(MMJJ201102016)资助课题

摘　　要：由于现有的基于非线性器件的混沌系统(Ikeda系统)容易受到重构攻击,影响通信的安全。在此基础上提出了一种基于非线性器件参数动态变化的光电延迟反馈混沌系统和基于该系统的安全通信方案。通过第一级混沌系统的输出改变注入激光的光强,使得第二级系统的增益系数产生动态变化,增加了系统可控参数的数目,进而对第二级系统的混沌动力学特性进行数值分析。分析了该系统在混沌调制下的同步通信情况,并且分析了增益系数不匹配和延迟时间不匹配等参数不匹配情况对系统同步的影响。实验结果表明本方法能提高混沌系统的复杂性,实现混沌保密通信。A new chaotic system and secure communication method are proposed based on optoelectronic feedback device with variable parameters, because the present system is easily attacked by the method of parameter estimation so as to affect the security of the communication. Dynamical changes of the gain coefficient of the second-class system are generated by changing the injected light intensity through the output of the first-class system, which increases the number of controllable parameters in the system. The chaotic dynamics of the system are theoretically and numerically analyzed. The communication situation of the system in the chaotic modulation conditions and the chaos synchronization when the parameters including gain coefficient and time delay are not compatible is analyzed. The experimental results show that this scheme can increase the chaotic complexity, and can achieve the chaotic secure communication.

关 键 词：非线性光学 混沌产生 光电反馈 混沌同步 混沌通信 

分 类 号：O43[机械工程—光学工程]