混沌光注入垂直腔面发射激光器混沌输出的时延和带宽特性  

Performances of time-delay signature and bandwidth of the chaos generated by a vertical-cavity surface-emitting laser under chaotic optical injection

作　　者：苏斌斌 陈建军[1,2] 吴正茂[1] 夏光琼[1] 

机构地区：[1]西南大学物理科学与技术学院,重庆400715 [2]新疆医科大学医学工程技术学院,乌鲁木齐830011

出　　处：《物理学报》2017年第24期76-83,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:61475127;61575163;61775184)资助的课题~~

摘　　要：提出并仿真论证了利用一个双光反馈垂直腔面发射激光器(定义为主VCSEL,M-VCSEL)产生的混沌光平行单向注入到另一个VCSEL(定义为副VCSEL,S-VCSEL)使所产生的混沌信号的延时特征(TDS)和带宽特性得以优化的技术方案.首先,基于VCSELs自旋反转模型,结合自相关分析方法,通过对系统参量进行优化,可使双光反馈M-VCSEL的X偏振分量(X-PC)和Y偏振分量(Y-PC)均输出混沌信号,且两路混沌信号的平均强度相当、TDS均较弱;在此基础上,将双光反馈M-VCSEL在优化条件下得到的混沌信号平行单向注入到S-VCSEL中,以获得两路TDS得到抑制、带宽更宽的混沌信号.通过考察两个偏振分量输出混沌信号的TDS以及混沌带宽在注入强度和频率失谐构成的参数空间的演化规律,确定了系统获取两路TDS被抑制、宽带宽的混沌信号所需的注入参数范围.Time-delay signature（TDS） and effective bandwidth（EBW） are two key performance indexes to evaluate a chaos signal generated by a laser system including delay-time feedback. In this paper, we propose and simulate a technical scheme to optimize the TDS and EBW of chaotic signal generated by a slave vertical-cavity surface-emitting laser（S-VCSEL） under chaotic optical injection from a master vertical-cavity surface-emitting laser（M-VCSEL）, which is subjected to double external-cavity feedback. First, based on the spin-flip model of a VCSEL subjected to two double external-cavity feedback, the time series of two orthogonal polarization components（referred to as X-component（X-PC）and Y-component（Y-PC）, respectively） in the M-VCSEL can be obtained. Furthermore, with the help of self-correlation function（SF） analysis method, the TDSs of X-PC and Y-PC can be evaluated. The results show that through selecting suitable system operation parameters, X-PC and Y-PC in the M-VCSEL can simultaneously output chaotic signals with equivalently average intensity and weak TDS. Under optimized operation parameters, the peak values of the SF（σ） of the chaotic signal are 0.20 for X-PC and 0.16 for Y-PC, respectively, and the EBWs of the chaotic signal are 10.72 GHz for X-PC and 10.10 GHz for Y-PC, respectively. The chaotic signals output from the M-VCSEL under optimized operation parameters are injected into the S-VCSEL for further weakening TDS and enhancing EBW. Through examining the evolution rules of TDS and EBW of polarization-resolved chaotic signals in the parameter space composed of injection strength and frequency detuning, the ranges of optimizing injection parameters are determined for achieving two-channel chaotic signals with well suppressed TDS（σ 0.1） and wide EBW（EBW 15 GHz）.

关 键 词：垂直腔面发射激光器 混沌 时延特征 带宽 

分 类 号：TN248[电子电信—物理电子学]