物理学报2017，Vol.66Issue(24)：95-103,9.DOI:10.7498/aps.66.244207
高斯切趾型光纤布拉格光栅外腔半导体激光器的混沌输出特性
Characteristics of chaotic output from a Gaussian apodized fiber Bragg grating external-cavity semiconductor laser
摘要
Abstract
Optical chaos based on semiconductor laser (SL) has some vital applications such as optical chaos secure commu-nication, high-speed physical random number generation, chaos lidar, etc. Among various schemes to drive an SL into chaos, the introduction of external cavity feedback is one of the most popular techniques, which can generate chaos signals with high dimension and complexity. For the chaos output from an external cavity feedback SL, a time-delay signature (TDS) and bandwidth are two key indexes to assess the chaos signal quality. In this work, according to the rate-equation model of an optical feedback SL, we theoretically investigate the characteristics of TDS and effective band-width (EWB) of chaotic output from a Gaussian apodized fiber Bragg grating (GAFBG) feedback SL (GAFBGF-SL). The results show that with the increase of feedback strength, the GAFBGF-SL experiences a quasi-periodic route to chaos. Through selecting the suitable feedback strength and the frequency detuning between the Bragg frequency of the GAFBG and the peak frequency of the free-running SL, the TDS of chaotic output from the GAFBGF-SL can be efficiently suppressed to a level below 0.02. Furthermore, by mapping the TDS and EWB in the parameter space of the feedback strength and the frequency detuning between the Bragg frequency of the GAFBG and the peak frequency of the free-running SL, the optimized parameter region, which is suitable for achieving chaotic signal with weak TDS and wide bandwidth, can be determined. We believe that this work will be helpful in acquiring the high quality chaotic signals and relevant applications.关键词
光纤光栅外腔半导体激光器/混沌/延时特征/带宽Key words
fiber Bragg grating external-cavity semiconductor laser/chaos/time delay signature/bandwidth引用本文复制引用
起俊丰,钟祝强,王广娜,夏光琼,吴正茂..高斯切趾型光纤布拉格光栅外腔半导体激光器的混沌输出特性[J].物理学报,2017,66(24):95-103,9.基金项目
国家自然科学基金(批准号:61475127,61575163,61775184)资助的课题.Project supported by the National Natural Science Foundation of China (Grant Nos.61475127,61575163,61775184). （批准号:61475127,61575163,61775184）
