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针对一种新型的双信道光混沌通信系统实验方案,建立了描述其工作特性的理论模型;通过数值模拟结果与报道的实验结果的比较,证实了该理论模型的合理性.利用该模型,基于小信号微扰理论,推导出了激光器传输函数的表达式;研究了信号能在系统中很好传递对系统参量的要求;定量地分析了信道干扰对系统同步性能的影响.对250MHz的调制信号在系统中的传输和解调进行了数值研究,结果表明,信号在传输过程中能得到很好的隐藏,且在输出端易于解调.
A theoretical model describing the working characteristics of a new type of dual-channel optical chaotic communication system is established. The rationality of the theoretical model is verified by comparison between the numerical simulation results and the reported experimental results. With this model, Small signal perturbation theory, the expression of the transfer function of the laser is deduced. The signal can well transfer the requirement of the system parameters in the system, and the influence of the channel interference on the system synchronization performance is analyzed quantitatively. In the system of transmission and demodulation for numerical study, the results show that the signal can be well hidden in the transmission process, and easy to demodulate the output.