延时可变光电振荡器产生混沌信号的路径及其特性研究  

Characteristics and Generation Routes of Chaos in Time Delay Varying Optoelectronic Oscillators

作　　者：陈振炜 孟义朝[1,2] 詹遥牧 Chen Zhenwei;Meng Yichao;Zhan Yaomu(Institute of Fiber Optics,Shanghai University,Shanghai 201800,China;Key Laboratory of Specialty Fiber Optics and Optical Access Networks,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学光纤研究所,上海201800 [2]上海大学特种光纤与光接入网省部共建重点实验室,上海200444

出　　处：《激光与光电子学进展》2020年第19期203-212,共10页Laser & Optoelectronics Progress

摘　　要：延时反馈光电振荡器是高速混沌保密通信系统产生光混沌信号的重要方案。通过Hopf分岔分析,详细研究了延时可变光电振荡器通往混沌的三条典型路径(激变、周期和准周期振荡及“breather”振荡)及其特性。通过仿真发现,随着延时的增加,输出信号的复杂度增加;当延时足够大时,在一定时间范围内出现周期脉冲现象。另外,相图突变的临界点可能是由滤波器引起的,但在临界点附近信号的复杂度变化不大。An optoelectronic oscillator with time delay varying feedback is an important means for generating laser chaos signals in a high speed optical chaos security communication system.Three typical routes to laser chaos(cataclysm,periodic and quasi periodic oscillations,and‘breather’oscillations)and their characteristics are investigated in detail through analyzing the Hopf bifurcation behaviors.The simulation shows that with the increase of time delay,the complex degree of the output signal increases,and when the time delay is large enough,there occur periodic pulse phenomena within a limited time range.In addition,there exists a critical point caused possibly by the filer,at which the phase diagram changes suddenly,but the complex degree of the output signal does not change obviously.

关 键 词：非线性光学 激光混沌 光电振荡器 延时反馈 通向混沌路径 HOPF分岔 

分 类 号：TN241[电子电信—物理电子学] TN242