光纤混沌双芯双向保密通信系统研究

把量子阱激光混沌耦合反馈同步系统应用于光纤保密通信中，提出光纤混沌双芯双向保密通信设想.通过耦合外部光注入多量子阱激光混沌全光耦合反馈同步系统和光纤传输信道，建立了光纤混沌双芯双向通信系统物理模型.理论和数值证明了激光混沌同步，理论分析指出光纤中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，并推导出混沌信号双芯双向传输中的非线性相移以及混沌激光功率限制和传输距离公式.数值实现了该系统在长距离二根光纤传输中的同步，详细地分析了系统同步时间随光纤传输长度的关系.模拟了调制频率06 GHz的混沌模拟通关键词：混沌同步光纤保密通信

Studies on dual-core-bidirectional optical fiber chaotic secure communication system

A dual-core-bidirectional optical fiber chaotic secure communication system is proposed based on coupling-feedback synchronization of chaotic injected multi-quantum well (MQW) laser systems with fiber channels for optical fiber secure communications. A physical model of the system is built using dual-core optical fiber connecting the transmitter and receiver. Chaotic synchronization was theoretically and numerically studied and we found theoretically that self-phase modulation in the fiber would limit the chaotic synchronization. The nonlinear phase shift, power limit and propagation length are formulated. Chaotic synchronization of two long-distance fibers was numerically achieved, and synchronization time varying with fiber propagation length was numerically analysed. Optical fiber chaotic communications and their synchronization errors were numerically simulated in long-distance dual-core-bidirectiond optical fiber chaotic secure communications with an analog signal of modulation frequency 06 GHz, a digital signal of modulation rate 06 bit/s and a bit rate of 005 Gbit/s of chaos keying shift, respectively. The system bandwidth is also numerically analysed. The system has a good security capability of application in dual-core-bidirectional fiber secure communications.