光反馈量子点微柱激光器双模混沌的产生  

Two-Mode Chaos Generation in Quantum Dot Micropillar Lasers Subject to Optical Feedback

作　　者：郭功名 郭龑强 Guo Gongming;Guo Yanqiang(Key Laboratory of Advanced Transducers and Intelligent Control System,Ministry of Education,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;College of Physics and Optoelectronics,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China)

机构地区：[1]太原理工大学新型传感器与智能控制教育部重点实验室,山西太原030024 [2]太原理工大学物理与光电工程学院,山西太原030024

出　　处：《激光与光电子学进展》2022年第5期202-213,共12页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61875147,62075154,61731014);山西省重点研发计划(201903D421049);山西省回国留学人员科研资助项目(HGKY2019023);山西省高等学校科技创新项目(201802053,2019L0131)。

摘　　要：量子点微柱激光器由于微米量级的模式体积和特有的动力学输出特性,为光子集成及保密通信等应用提供了一个良好的研究平台。利用外腔光反馈的量子点微柱激光器产生双模混沌光场,研究分析了光反馈量子点微柱激光器在不同电流及反馈强度条件下的强弱模式竞争、时延特征及有效带宽的变化。结果表明:模式竞争较强时,即在强弱模分叉明显的电流区间,强弱模的输出功率差会随着强弱模反馈强度的增加先减小后增大;强弱模输出混沌光场的有效带宽随着强弱模反馈强度的增加呈现出先增加后减小之后再增加的变化,在泵浦电流为13μA,强弱模反馈强度分别为4 ns^(-1)和3 ns^(-1)时,强弱模输出混沌光场的有效带宽增至首个峰值,分别为8.91 GHz和8.49 GHz;随着强弱模反馈强度的增加,强弱模输出混沌光场的时延特征峰值也呈现出先增加后减小之后再增加的变化,在泵浦电流为13μA,强弱模反馈强度分别为16 ns^(-1)和14 ns^(-1)时,强弱模输出相干塌陷混沌光场的时延特征峰值分别降至最低,为0.083和0.092,且对应的有效带宽为11.31 GHz和11.02 GHz。Quantum dot micropillar laser is an excellent research platform for photonic integration and secure communication,due to itsμm-scale mode volume and unique dynamics.In this study,a quantum dot micropillar laser with external cavity optical feedback is used to generate a two-mode chaotic light field.The competition between strong mode and weak mode,time delay signature,and effective bandwidth of the quantum dot micropillar laser with optical feedback are examined under various pump currents and feedback intensities.The results demonstrate that when the mode competition between strong mode and weak mode is high,i.e.,the output power bifurcation between strong mode and weak mode is obvious,the output power difference between the two modes decreases at first,then decreases,as the feedback intensity increases.The chaotic light field’s effective bandwidth increases at first,then decreases,and increases again as the feedback intensity increases.When the pump current is 13μA,and the feedback intensities of the strong mode and weak mode are 4 ns^(-1) and 3 ns^(-1),the effective bandwidth of the chaotic laser of the strong mode and weak mode increases to the first peak values of8.91 GHz and 8.49 GHz,respectively.The time delay signature of the two-mode chaotic laser first increases,then decreases,and increases again as the feedback intensity increases.When the pump current is 13μA,the feedback intensities of the strong mode and weak mode are 16 ns^(-1) and 14 ns^(-1),respectively,the time delay signatures of the coherence-collapse chaotic laser for the strong mode and weak mode are 0.083 and 0.092,and the corresponding effective bandwidths are 11.31 GHz and 11.02 GHz.

关 键 词：激光器 混沌 光反馈 量子点微柱激光器 时延特征 有效带宽 

分 类 号：TN248.4[电子电信—物理电子学]