摘要
The sensitivity to fault reflection is very important for larger dynamic range in fiber fault detection technique.Using time delay signature(TDS)of chaotic laser formed by optical feedback can solve the sensitivity limitation of photodetector in fiber fault detection.The TDS corresponds to the feedback position and the fault reflection can be detected by the laser diode.The sensitivity to feedback level of circular-side hexagonal resonator(CSHR)microcavity laser is numerically simulated and the feedback level boundaries of each output dynamic state are demonstrated.The peak level of TDS is utilized to analyze the sensitivity.The demonstration is presented in two aspects:the minimum feedback level when the TDS emerges and the variation degree of TDS level on feedback level changing.The results show that the CSHR microcavity laser can respond to the feedback level of 0.07%,corresponding to-63-dB feedback strength.Compared to conventional distributed feedback laser,the sensitivity improves almost 20 dB due to the shorter internal cavity length of CSHR microcavity laser.Moreover,1%feedback level changing will induce 1.001 variation on TDS level,and this variation degree can be influenced by other critical internal parameters(active region side length,damping rate,and linewidth enhancement factor).
作者
Tong Zhao
Zhi-Ru Shen
Wen-Li Xie
Yan-Qiang Guo
An-Bang Wang
Yun-Cai Wang
赵彤;申志儒;谢文丽;郭龑强;王安帮;王云才(Key Laboratory of Advanced Transducers and Intelligent Control System,Ministry of Education and Shanxi Province,Taiyuan University of Technology,Taiyuan 030024,China;College of Physics and Optoelectronics,Taiyuan University of Technology,Taiyuan 030024,China;Guangdong Provincial Key Laboratory of Photonics Information Technology,Guangzhou 510006,China;School of Information Engineering,Guangdong University of Technology,Guangzhou 510006,China)
基金
Project supported by the National Key Research and Development Program of China(Grant No.2019YFB1803500)
the National Natural Science Foundation of China(Grant Nos.61705160,61961136002,61822509,and 61875147)
the“1331 Project”Key Innovative Research Team of Shanxi Province,China
the National Defense Basic Scientific Research Project(Grant No.WDYX19614260203)。
