多调制延时耦合半导体激光器的混沌同步与编码

数值研究了非相干光反馈与非相干光注入半导体激光器的多调制延时混沌同步,由于该系统是基于非相干注入的,所以不需要接收激光器的频率与发送激光器频率完全匹配。通过对非相干光反馈半导体激光器输出自相关函数的研究,发现在多调制延时系统中,延时标识可以被隐藏,这一特性可以提高系统的安全性,非常适用于混沌保密通信系统。分别利用混沌移位键控(CSK)及混沌隐藏(CMS)编码方法考查了单向耦合和双向耦合系统的通信性能。

Chaos synchronization and encoding in coupled semiconductor lasers of multiple modulated time delays

The synchronization in multiple modulated time delay chaotic lasers subject to incoherent optical feedbacks and incoherent optical injection is numerically investigated,in which the semiconductor lasers are subject to incoherent injection that fine tuning of optical frequency is not required.Otherwise,by studying the autocorrelation function of the incoherent feedback semiconductor laser output,it is found that the signatures of time delays can be erased in systems incorporating modulated feedback time delays,which property can improve the system security and is of importance for the suitability of such laser systems for secure chaos-based communication systems.Finally,the encryption method of CSK and CMS is respectively utilized to examine the communication ability of the unidirectionlly and bidirectionly coupled system.