光反馈分布式反射激光器产生宽带激光混沌  

Broadband Laser Chaos Generated by Distributed Reflection Laser with Optical Feedback

作　　者：方文康 贾志伟 李青天 柳莹 宫蕾 王龙生 郭园园[1,2] 王安帮 Fang Wenkang;Jia Zhiwei;Li Qingtian;Liu Ying;Gong Lei;Wang Longsheng;Guo Yuanyuan;Wang Anbang(Key Laboratory of Advanced Transducers and Intelligent Control System,Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;College of Electronic Information and Optical Engineering,Taiyuan University of Technology,Jinzhong 030600,Shanxi,China;Key Laboratory of Photonic Technology for Integrated Sensing and Communication,Ministry of Education,Guangdong University of Technology,Guangzhou 510006,Guangdong,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]太原理工大学电子信息与光学工程学院,山西晋中030600 [3]广东工业大学通感融合光子技术教育部重点实验室,广东广州510006

出　　处：《光学学报》2024年第21期167-174,共8页Acta Optica Sinica

基　　金：国家自然科学基金(62035009,62105233);山西省基础研究计划(20210302123183,20210302123185,202203021221079);山西省“1331工程”重点创新团队项目。

摘　　要：面向宽带激光混沌产生,提出一种带有相位区的三区分布式反射(DR)激光器,并进行了仿真研究。研究发现,在外部光反馈下,随着光反馈强度的增大,DR激光器经过间歇性路径进入宽带混沌状态。由于DR激光器中的双光共振效应(PPR),混沌振荡的高频部分显著增强,从而使产生激光混沌的带宽超过45 GHz。研究了PPR频率和强度对产生激光混沌的影响,发现PPR频率越低,所产生混沌的带宽越大,而PPR强度对所产生混沌的带宽影响不大。所提出的三区DR激光器的PPR频率可以通过改变相位区和分布式反射区电流进行调控,从而调控激光混沌状态,这种可调控宽带激光混沌源对于开发高速保密光通信技术具有重要意义。Objective Laser chaos has wide spectrum,noise-like,and synchronizable features,with great application potential in many fields,thus catching much research attention.Semiconductor lasers can produce broadband and high-complexity chaos under external light feedback and are the most widely studied and employed chaos source.The chaos mechanism produced by semiconductor lasers is that the inherent relaxation oscillation is unstable and the power spectra are broadened under external optical feedback disturbance.This leads to the phenomenon that the generated power spectrum energy of the chaos is mainly distributed around the relaxation oscillation frequency,the chaos bandwidth is usually less than 10 GHz,and the power spectra are not flat enough,which is unable to satisfy the practical application requirements.Meanwhile,researchers have proposed many schemes to increase the chaos bandwidth.On the one hand,the introduction of complex external optical paths is a kind of method,but this method will not only result in large size,high cost,and poor stability of the chaos source but also make the chaos synchronization extremely difficult,which is not conducive to the development of high-speed chaos secure communication technology.Another way to improve the chaos bandwidth is to start with the semiconductor laser itself,but a problem with this method is that the generated broadband chaos cannot be controlled at high speed,thereby becoming another obstacle to the development of high-speed chaos secure communication technology.Since the distributed reflection(DR)laser is an ultrafast semiconductor laser and has broken through the bandwidth limitation of previous direct-tuned lasers in the last five years,we propose a three-section DR laser structure with phase sections,which can be realized by changing the injection currents in the phase and DBR sections for state modulation of chaos.Methods We propose and simulate a three-section DR laser with phase sections for broadband laser chaos generation.Firstly,the simulation software

关 键 词：宽带激光混沌 分布式反射激光器 双光共振效应 保密光通信 

分 类 号：O439[机械工程—光学工程]