论文部分内容阅读
分析了延时反馈双环掺铒光纤(EDF)激光器互注入系统的动态特性,并引入一种量化时间序列复杂度的评价方法——排列熵(PE,permutation entropy),对激光器输出状态和混沌同步质量与复杂度的关系进行讨论。研究表明,通过调节反馈延迟时间和反馈强度可控制系统的输出状态,使系统输出为周期态和混沌态,而且利用PE熵计算激光器输出信号的复杂度相对于分岔图同样能直观准确的反映出系统动态行为;在激光器独立工作情况下,输出信号的混沌区域内夹杂有较多的周期态,而在互注入情况下,混沌区域增宽且较为平坦,同时输出信号复杂度的PE值较高,互注入系统有利于参数选择的范围和提高混沌通信系统的安全性;提高注入强度可得到高质量的混沌同步,两个激光器在同步和不同步时输出信号的复杂度是不同的,可见研究激光器输出信号的复杂度可成为分析混沌同步质量的一种参考。
The dynamic characteristics of double-loop erbium-doped fiber (EDF) laser inter-injection system with delay feedback are analyzed, and a method to quantify the complexity of time series is introduced, permutation entropy (PE) The relationship between quality and complexity is discussed. The research shows that the output state of the system can be controlled by adjusting the feedback delay time and the feedback strength so that the output of the system is the periodic state and the chaos state. Moreover, using the PE entropy to calculate the complexity of the laser output signal can reflect the bifurcation diagram directly and accurately In the case of laser working independently, there are more periodic states in the chaotic region of the output signal, while in the case of mutual injection, the chaotic region is wider and flatter, and the PE value of the output signal complexity is more High and mutual injection system is beneficial to the range of parameter selection and improve the security of chaotic communication system; improve the injection intensity can get high quality chaos synchronization, the output signal complexity of the two lasers are different when they are synchronous and unsynchronized, Studying the complexity of the laser output signal can be a reference for analyzing the quality of chaos synchronization.