中国激光, 2018, 45 (6): 0606002, 网络出版: 2018-07-05   

双延时反馈光电振荡系统产生混沌激光的动力学特性 下载: 825次

Dynamic Characteristics of Optoelectronic Oscillation System with Double Delay Feedback for Generating Laser Chaos
潘明 1,2孟义朝 1,2,*陈振炜 1,2
作者单位
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 200072
摘要
在光电振荡器(OEO)混沌系统的基础上,将混沌激光输出重新反馈到马赫-曾德尔调制器(MZM),使原系统的增益系数发生动态变化,同时在系统中引入第二个时间延迟。从理论上研究了改进后混沌系统的反馈时间和反馈强度对系统复杂性和延时特征的影响。仿真结果表明:光反馈OEO输出的混沌激光更复杂,延时特征更低。当光反馈的延时时间与光电反馈的延时时间相同时,光反馈OEO系统表现出较好的混沌动力学特性。该方法在不过多增加系统成本的前提下,可产生更复杂的混沌信号,同时可以降低信号延时特征,有利于提高通信系统的安全性。
Abstract
On the basis of typical optoelectronic oscillator (OEO) chaotic system, the output of chaotic laser is fed back to the Mach-Zehnder modulator (MZM), so that the gain coefficients of the original system can change dynamically and a second time delay is introduced into the system. Then we study the effects of the feedback time and the feedback intensity of the improved chaotic system on the time-delay characteristics and complexity of the system theoretically. The simulation results show that the chaotic laser generated by the optoelectronic oscillator with optical feedback has higher complexity and lower delay characteristics. The system exhibits the better chaotic dynamic characteristics when the delay time of the optical feedback is the same as the delay time of the photoelectric delay. The results show that this method can produce more complex chaotic signals and reduce the delay characteristics of signals without increasing the system costs, and it is helpful to improve the security of the system.

潘明, 孟义朝, 陈振炜. 双延时反馈光电振荡系统产生混沌激光的动力学特性[J]. 中国激光, 2018, 45(6): 0606002. Ming Pan, Yichao Meng, Zhenwei Chen. Dynamic Characteristics of Optoelectronic Oscillation System with Double Delay Feedback for Generating Laser Chaos[J]. Chinese Journal of Lasers, 2018, 45(6): 0606002.

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