用双滤波反馈半导体激光器产生低延时特征的混沌信号

卢东; 钟祝强; 夏光琼; 吴正茂

doi:doi:10.3788/gzxb20164510.1014003

光子学报, 2016, 45 (10): 1014003, 网络出版: 2016-11-14

用双滤波反馈半导体激光器产生低延时特征的混沌信号

Chaotic Signal Generation with Low Time-delay Signature Based on a Semiconductor Laser Subject to Double Filtered Optical Feedback

论文大纲

卢东 ^*钟祝强夏光琼吴正茂

作者单位

西南大学物理科学与技术学院, 重庆 400715

摘要

将两个法布里-珀罗干涉仪作为双外腔构成双滤波反馈半导体激光器，获取低延时特征混沌信号，理论研究了反馈时间、反馈强度、滤波器带宽以及滤波器中心频率与激光器中心频率之间的频率失谐对双滤波反馈半导体激光器混沌输出延时特征的影响.研究结果表明：当两个腔的反馈延迟时间之差约等于激光器弛豫振荡周期的一半时，输出混沌信号的延时特征抑制效果相对较好.在此基础上，通过合理选择反馈强度、滤波器带宽、滤波器中心频率与激光器中心频率之间的频率失谐，双滤波反馈半导体激光器输出混沌信号的延时特征被进一步抑制.最后，绘制混沌延时特征在滤波器带宽和频率失谐构成的参量空间的分布图，确定获取低延时特征的混沌信号所需的反馈参量范围.

Abstract

Two Fabry-Perot interferometers were taken as double external cavities to construct a Double Filtered Optical Feedback Semiconductor Laser (DFOF-SL) for achieving chaotic signal with low time-delay signature, and the influences of feedback time, feedback strength, filter bandwidth, and the frequency detuning between the central frequency of the filter and the solitary laser on the time-delay signature evolution were theoretically investigated. The results show that, when the difference of the feedback time between the two external cavities approximately equals to a half of the relaxation oscillation period of the laser, the chaotic signal with relatively weak time-delay signature can be obtained. Moreover, through suitably selecting feedback strength, filter bandwidth, and the frequency detuning between the central frequency of the filter and the solitary laser, the time-delay signature can be further suppressed. Finally, based on the map of time-delay signature evolution in the parameter space of filter bandwidth and frequency detuning, the optimal feedback parameter regions for achieving chaotic signal with low time-delay signature have been determined.

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卢东, 钟祝强, 夏光琼, 吴正茂. 用双滤波反馈半导体激光器产生低延时特征的混沌信号[J]. 光子学报, 2016, 45(10): 1014003. LU Dong, ZHONG Zhu-qiang, XIA Guang-qiong, WU Zheng-mao. Chaotic Signal Generation with Low Time-delay Signature Based on a Semiconductor Laser Subject to Double Filtered Optical Feedback[J]. ACTA PHOTONICA SINICA, 2016, 45(10): 1014003.

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