外注入激光同步方程和在保密通信中的应用

本文建立了外部光注入半导体激光器的同步系统误差方程,实现了外部光注入波长1.31μm分布反馈激光器的两个激光混沌系统的同步,其同步误差几乎为零.成功数值模拟了该同步系统在长距离光纤传输中的同步,其同步误差随着传输距离而增加,光纤的自相位调制是限制激光混沌在光纤传输中同步的主要原因,分析了这种传输的极限,讨论了在不同传输距离上的强度噪声和相位噪声对同步误差的影响.在长距离光纤模拟和数字保密通信中应用的数值模拟表明,无论是在时域还是在频域,信息在混沌中都难以分离,确具有很高的保密性能和反破译能力.

Synchronous Equations for External-Injected lasers and Its Application for Secure Communications

A synchronous error equation for semiconductor lasers injected with external light is presented.Two chaotic systems with distributed feedback semiconductor lasers injected with external light at 1.31μm can be synchronized with little synchronous error.The chaotic synchronous system has been successfully stimulated in a long propagation distance optical fiber.The synchronous error increases with the fiber length.The synchronization is limited by the self-phase modulation in the fiber.The influences of intensity and phase noises on the synchronous error are studied in different propagation distances.Both analog and digital secure communications with the system are studied by numerical simulations in the long propagating distances.It is found that the information is hidden in the chaotic signal very well both in time-domain and frequency-domain and the system shows the good ability of robust security and anti-uncoverage.