光纤信道对激光混沌保密通信影响的分析

Analysis on effects of laser chaos secure communication from fiber channel

激光混沌信号具有高度敏感性、复杂性和固定性,使得光纤信道对激光混沌保密通信造成了不小的影响。为此,根据激光混沌信号的同步特征,设计激光混沌保密通信模型,模型采取闭环通信原理,通信过程满足动力学单模速度函数。进行了光纤信道中色散和非线性效应对激光混沌保密通信影响的分析,通过增大激光混沌信号频率保障加载信号完整性,并在光纤信道中加入掺铒光纤放大器进行色散补偿,维持激光混沌信号同步性,增强保密通信成功率。实验结果表明,所设计的激光混沌保密通信模型能够减少光纤信道对激光混沌保密通信的影响,具有不错的保密性能和调制性能。

The high sensitivity, complicity and stationarity of laser chaotic signal makes big influence on its secure communication from optical fiber channel. Therefore, laser chaotic secure communication model was designed accord- ing to the synchronicity of laser chaotic signal. This model uses close loop communication principle which meets the ki- netics single mode velocity function. Analyzed the effects on laser chaotic secure communication channel from the dis- persion and nonlinear effect of optical fiber channel, insure the integrity of buffering signal through increasing the fre- quency of laser chaotic signal, and compensate dispersion, maintain synchronicity and enhance the success rate of se- cure communication by adding erbium doped fiber amplifier in fiber channel. Experimental results show that this model designed can efficiently decrease the effects on laser chaotic secure communication from fiber channel and it has good secure and modulation performances.