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安全性是混沌通信中的重要问题。基于一个外光反馈半导体激光器驱动两个互耦合激光器的混沌通信系统,研究激光混沌系统中反馈时延与耦合时延特征,并应用龙格-库塔法进行动态仿真。重点分析了当调节一些可控参数(耦合时延和驱动强度)时,能够改变两耦合激光器输出自相关函数中反馈时延和耦合时延幅值的差异,以此掩藏反馈时延,从而得出更优载波。仿真结果说明利用耦合时延可以增强激光混沌系统的安全性。最后给出了在优化载波后系统同步质量的讨论。
Security is an important issue in chaos communications. Based on an external optical feedback semiconductor laser driving two mutual coupling lasers, the chaotic communication system is studied. The feedback delay and coupled delay characteristics of the laser chaotic system are studied. The Runge-Kutta method is used for dynamic simulation. It is emphatically analyzed that when some controllable parameters (coupling delay and drive strength) are adjusted, the difference between the feedback delay and the coupling delay in the autocorrelation function of the two coupled lasers can be changed to hide the feedback delay A better carrier. Simulation results show that the use of coupling delay can enhance the safety of laser chaotic system. Finally, the discussion of system synchronization quality after carrier optimization is given.