相位共轭光反馈下半导体环形激光器的动力学  

Dynamics of Semiconductor Ring Laser Subject to Phase Conjugate Optical Feedback

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：《激光与光电子学进展》2021年第19期311-319,共9页Laser & Optoelectronics Progress

基　　金：湖北省教育厅科学研究计划指导性项目(B2020194,B2020197)。

摘　　要：利用双模行波模型,数值研究了半导体环形激光器(SRL)在相位共轭交叉光反馈下的非线性动力学特性。研究发现,当两个模式的相位变化不同步时,SRL表现出低频反相振荡,其振荡周期随着反馈时间的增大逐渐增加。而对于相位变化同步的情况,通过改变注入强度,SRL可输出单周期态、多周期态和混沌态。利用自相关函数识别了产生的混沌信号的时延特征(TDS)并利用功率谱技术计算了相应的带宽,发现TDS随着反馈强度的增加先逐渐减小再增大,而带宽随着反馈强度的增加呈近似线性增加。这说明通过恰当调节反馈强度,混沌信号的TDS可以被较好地抑制,该信号可应用于安全保密通信和随机数产生中。Based on the two-mode traveling wave model,the nonlinear dynamics of a semiconductor ring laser(SRL)subject to phase conjugate cross optical feedback is numerically studied.It is found that the SRL shows low frequency anti-phase oscillation when the phase changes of these two modes are desynchronized,and the oscillation period increases with the increase of feedback time.In contrast,in the case that the phase changes are synchronized,the two-mode output of the SRL can be one-periodic,multiply-periodic and chaotic by changing injection intensity.In addition,the time-delay signature(TDS)of the generated chaotic signal is identified by the autocorrelation function(ACF),and the corresponding bandwidth is calculated by using the power spectrum.It is found that the TDS first decreases and then increases with the increase of feedback strength,however the bandwidth increases approximately linearly,which indicates that by properly adjusting the feedback strength,the TDS of chaotic signals can be well suppressed and these signals can be used for secure communications and random number generation.

关 键 词：非线性光学 半导体环形激光器 相位共轭 混沌 时延特征 

分 类 号：O437.1[机械工程—光学工程]