基于双光电延迟反馈装置的双向混沌保密通信系统

A Bidirectional Chaotic Secure Communication System Based on Optoelectronic Delay Devices with Double Feedback

提出了基于双光电延迟反馈装置的双向混沌保密通信系统,数值研究了系统的同步特性及通信性能.结果表明,系统输出的混沌波具有更宽的频带和更为复杂的频谱,有利于提高通信容量和系统的保密性;当两个激光器和两个调制器的参数一致时,能获得无延时的高质量混沌同步,并实现实时双向通信;参数失配对系统同步性能和通信质量有一定影响,但在一定的参数失配范围内,系统仍能实现较好的双向混沌通信.

In this paper, a bidirectional chaotic secure communication system based on optoelectronic delay devices with double feedback is presented, and the synchronization characteristics and the communication performances of such a system are numerically investigated. The results show that the chaotic outputs of this system become more complex and have larger bandwidth, which is helpful for improving the commu- nication capacity and system security; when the parameters of the two lasers and the two modulators are matched, good-quality chaos synchronization with zero lag time and simultaneous bidirectional transmis- sion can be realized and when the parameters of the system are mismatched, the synchronization quality and communication performance are affected to a certain extent, but the system possesses good robustness against the mismatched parameters and can still realize bidirectional chaos communication within a certain mismatched parameter range.