Jiang Zaifu, Wu Zhengmao, Yang Wenyan, Hu Chunxia, Lin Xiaodong, Jin Yanhong, Dai Ming, Cui Bin, Yue Dianzuo, Xia Guangqiong
Appl Opt. 2020 Mar 20;59(9):2935-2941. doi: 10.1364/AO.388489.
Based on a three-level model for quantum dot (QD) lasers, the characteristics of the photonic microwave generated by a QD laser simultaneously subject to optical injection and optical feedback are numerically investigated. First, the performance of the microwave signal generated by an optical injected QD laser operating at period one state are analyzed, and the mappings of the frequency and intensity of the generated microwave in the parameter space of the frequency detuning and injection strength are given, which are roughly similar to those reported experimentally. Next, an optical feedback loop is further introduced to the optically injected QD laser for compressing the linewidth of the microwave signal, and the results demonstrate that the linewidth of the generated microwave can be reduced by at least 1 order of magnitude under suitable feedback parameters. Finally, the effect of the linewidth enhancement factor on the generated microwave signal is analyzed.
基于量子点（QD）激光器的三能级模型，对同时受到光注入和光反馈的量子点激光器产生的光子微波特性进行了数值研究。首先，分析了处于周期一状态工作的光注入量子点激光器产生的微波信号的性能，并给出了在频率失谐和注入强度参数空间中所产生微波的频率和强度映射，这些映射与实验报道的大致相似。其次，在光注入量子点激光器中进一步引入光反馈回路以压缩微波信号的线宽，结果表明在合适的反馈参数下，所产生微波的线宽可至少降低一个数量级。最后，分析了线宽增强因子对所产生微波信号的影响。
