中国激光, 2017, 44 (2): 0208002, 网络出版: 2017-02-22
布里渊散射对光反馈混沌源时延特征的抑制
Time-Delay Signature Suppression in Chaotic Laser Source with Optical Feedback by Brillouin Scattering
非线性光学 布里渊散射 光反馈半导体激光器 时延特征 混沌激光 nonlinear optics Brillouin scattering semiconductor lasers with optical feedback time delay signature chaotic laser
摘要
提出了一种利用光纤布里渊散射效应抑制光反馈半导体激光器时延特征的方法。实验研究发现,当平均功率为200 mW的混沌激光注入到长为10 km的单模光纤中,经过光纤的后向布里渊散射作用,混沌激光自相关曲线在时延105 ns处的峰值从0.251降低到0.075,互信息曲线在时延105 ns处的峰值从0.087降低到0.008。在此基础上,实验分析了注入光功率对混沌激光时延特征抑制效果的影响,结果表明,当混沌激光注入的平均功率在200~1500 mW范围内时,混沌激光的时延特征得到有效抑制;当测量次数在1~50范围内时,光纤布里渊散射对混沌激光时延特征的抑制效果较稳定。
Abstract
A new method of time-delay signature suppression in semiconductor lasers with optical feedback by utilizing Brillouin scattering effect in optical fibers is proposed. Experimental results show that, when a chaotic laser with an average power of 200 mW is injected into the single mode fiber with a length of 10 km and after the action of Brillouin backscattering in fibers, the peak value at time delay of 105 ns of the chaotic laser auto-correlation trace is reduced from 0.251 to 0.075 and the peak value at time delay of 105 ns of the chaotic laser mutual information trace is reduced from 0.087 to 0.008. On this basis, the influence of optical injection power on time-delay signature suppression effect is experimentally investigated and the results indicate that, when the average power of chaotic laser is within the range of 200-1500 mW, the time-delay signature can be effectively suppressed; when the number of measurements is within the range of 1-50, the time-delay signature suppression effect of chaotic laser by the fiber Brillouin scattering is relatively stable.
张建忠, 冯昌坤, 张明江, 刘毅, 张永宁. 布里渊散射对光反馈混沌源时延特征的抑制[J]. 中国激光, 2017, 44(2): 0208002. Zhang Jianzhong, Feng Changkun, Zhang Mingjiang, Liu Yi, Zhang Yongning. Time-Delay Signature Suppression in Chaotic Laser Source with Optical Feedback by Brillouin Scattering[J]. Chinese Journal of Lasers, 2017, 44(2): 0208002.