自混沌光相位调制光反馈半导体激光器输出光的混沌特性  

Chaotic characteristics of output light from semiconductor laser with self-chaotic phase modulation and optical feedback

作　　者：庞爽 冯玉玲[1] 于萍 姚治海[1] Pang Shuang;Feng Yu-Ling;Yu Ping;Yao Zhi-Hai(Department of Physics,Changchun University of Science and Technology,Changchun 130022,China)

机构地区：[1]长春理工大学物理系,长春130022

出　　处：《物理学报》2022年第15期46-55,共10页Acta Physica Sinica

基　　金：吉林省科技发展计划(批准号:20190201135JC)资助的课题。

摘　　要：混沌光的延时特征(time delay signature,TDS)和带宽是影响混沌激光应用的两个重要参量,常用来表征混沌光的混沌特性.将具有外腔光反馈的半导体激光器(semiconductor laser,SL)作为主激光器,以具有自混沌光相位调制光反馈的SL作为从激光器,并将主激光器输出的混沌光双路注入到从激光器中,构成具有外光双路注入的自混沌光相位调制光反馈的半导体激光器系统.数值研究了外光注入系数和反馈系数等参数对系统输出光TDS的影响,然后将此系统对TDS的抑制效果和具有外光双路注入的光反馈半导体激光器以及具有外光单路注入的自混沌光相位调制光反馈半导体激光器进行对比和分析,从而阐明了本文所提出的方案对TDS的抑制效果较好.在TDS被有效抑制的参数条件下,研究了混沌光的带宽,结果表明:本文提出的方案可以有效提高系统输出混沌光的带宽,获得混沌光的3 dB带宽的最大值约为16 GHz.Distributed feedback semiconductor lasers(DFB-SLs) are the class B lasers,and would output chaotic laser under the external disturbances,such as external optical feedback and optical injection.Chaotic laser are widely used in many fields,including optical fiber sensing,chaotic laser secure communication,and better entropy sources for generating high-speed random number.However,the chaotic laser outputted from the semiconductor lasers with external cavity optical feedback produces a time delay signature(TDS),which limits the applications of chaotic laser.On the other hand,the bandwidth(BW) of chaotic carrier signal plays the important role in determining the transmission rate of information signal.Therefore,the TDS and BW are two important parameters that will affect chaotic laser’ s applications,and they are usually used to describe the chaos characteristics of chaotic laser.In this paper,we present a new scheme used to describe the TDS and investigate the BW of chaotic laser from semiconductor laser.For this scheme,the output laser from a DFB-SL with external single optical feedback is injected in double ways into another DFB-SL with phase modulation optical feedback by self chaos light.Thus they form a semiconductor laser system with external double optical injection and phase modulation optical feedback by self chaos light(SL-EDOI-PMOFBSCL).We investigate numerically the influences of the system parameters on TDS,such as the injection coefficient and feedback coefficient.Then the suppression effects on TDS are contrasted and analyzed with two other systems,that is to say,the semiconductor laser with external double optical injection and optical feedback(SL-EDOI-OF) and the semiconductor laser with external single optical injection and phase modulation optical feedback by self chaos light(SL-ESOI-PMOFBSCL).The results indicate that the proposed scheme in this work has the better suppression effect on TDS.Then the BW of the chaotic laser is investigated under the parameters conditions of effectively suppressin

关 键 词：分布反馈半导体激光器 自混沌光相位调制光反馈 延时特征 带宽 

分 类 号：TN248.4[电子电信—物理电子学]