单向耦合下半导体环形激光器的混沌同步  

Chaotic Synchronization of Semiconductor Ring Laser Under Unidirectional Coupling

作　　者：张定梅[1] 蒋再富[1] Zhang Dingmei;Jiang Zaifu(School of Mathematics and Physics,Jingchu University of Technology,Jingmen,Hubei 448000,China)

机构地区：[1]荆楚理工学院数理学院,湖北荆门448000

出　　处：《应用激光》2021年第2期326-331,共6页Applied Laser

基　　金：2020年度湖北省教育厅科学研究计划指导性项目(B2020194,B2020197);荆楚理工学院2020年度校级专项科研项目(ZX202002)。

摘　　要：为了满足保密通信的需求,构建了一种利用两个单向耦合的半导体环形激光器进行混沌同步的系统,通过数值仿真后得到了几种参数下的输出波形、功率谱及自(互)相关图,并讨论了注入参数对同步性能的影响。仿真结果表明:主激光器在交叉反馈的情况下,产生的混沌信号具有较强的时间延迟特征,不利于混沌保密通信。引入自反馈后,时延特征得到了很好的抑制,混沌信号的质量明显提高。将此低时延特征的混沌信号注入从激光器中进行混沌同步,在固定的频率失谐下,发现通过增加注入系数可以显著提高同步系数。此外,通过绘制二维空间映射图,可以确定同步系数在0.9以上的高质量混沌同步区域。To meet the needs of secure communications,a scheme of chaotic synchronization based on the two unidirectionally coupled semiconductor ring lasers(SRL)is proposed.The wave form,power spectrum and self(cross)correlation diagrams under several parameters are obtained by numerical simulation,and the effect of injection parameters on chaotic synchronization performance is studied.The results show that the time-delay signatures(TDS)of chaotic signals are obvious when the master SRL is subjected to the optical cross-feedback,which is not conducive to the secure communication system.After introducing optical self-feedback in the master SRL,the TDS is well suppressed,and the quality of chaotic signals is significantly improved.The chaotic signal with low TDS is injected into the slave laser to achieve chaos synchronization.Under the fixed frequency detuning,it is found that the synchronization coefficient can be significantly increased by increasing the injection coefficient.In addition,by drawing a two-dimensional space map,the high-quality chaotic synchronization region with a synchronization coefficient above 0.9can be determined.

关 键 词：非线性光学 混沌同步 自(互)相关 半导体环形激光器 光注入 

分 类 号：O437.1[机械工程—光学工程] TN248.4[理学—光学]