将双光互注入半导体激光器作为混沌光发射源,构建了受环境影响较小、稳定性较好的全光纤型混沌同步通信系统,并从延时特征的隐藏、接收与发射激光器的互相关性及输出混沌光带宽三方面研究该系统的同步通信能力。使用自相关函数及互信息函数等数学工具仿真计算该系统外腔反馈延时特征峰值、发射与接收激光器的互信息函数峰值及系统输出混沌光带宽。研究表明,通过适当调整参数使发射与接收激光器高度同步,双光互注入系统外腔反馈延时特征峰值可减小至0.1899,比相同条件下单光互注入的延时特征峰值降低了0.1696,接收和发射激光器最大互相关系数为0.9113。此外,21 GHz的中心频率失谐能将输出光带宽展宽到3.319 GHz。经实验验证,双光互注入系统产生的混沌载波能很好地隐藏实验用的正弦波信号,并且能够在接收端成功解调。

We build a chaos synchronization communication system with less environmental impact and better stability, using the dual-path mutual coupling semiconductor laser as a transmitter of chaotic light. The communication capability of this system is studied from the hiding of time delay characteristics, the correlation between the transmitting and receiving lasers, and the output chaotic optical bandwidth. The peaks of the feedback time delay characteristics of the external cavity of this system, the peaks of the mutual information function of the transmitting and receiving lasers, and the output chaotic optical bandwidth of the system are calculated by using mathematical tools such as autocorrelation function and mutual information function. The peak value of feedback time delay characteristic of the dual-path mutual coupling system can be reduced to 0.1899 when the transmitting and receiving lasers are synchronized by adjusting the parameters, which is 0.1696 lower than the characteristic peak value of a single-path mutual coupling system under the same conditions. The maximum cross correlation coefficient between receiving and transmitting lasers is 0.9113. In addition, the central frequency detuning up to 21 GHz can broaden the output optical bandwidth to 3.319 GHz. The experiment verifies that the chaotic carrier generated by the dual-path mutual coupling system can hide the sinusoidal signal well and successfully demodulate at the receiver.