外腔延时特征(TDS)和带宽是影响混沌激光应用的两个重要参量。将一个具有相位调制光反馈的半导体激光器输出的激光注入到另一个具有光电反馈的半导体激光器中,构成一个具有外光注入的光电反馈半导体激光器系统,即主从激光器系统,用于降低混沌激光的TDS并提高其带宽。数值研究了外光注入系数、反馈强度和抽运因子对TDS的影响,并研究了主激光器输出混沌光的TDS对从激光器输出混沌光TDS的影响。然后在TDS被有效抑制的基础上研究了系统输出混沌激光的带宽,结果表明:该方案可以有效地降低混沌激光的TDS,外光注入系数、反馈强度和抽运因子的增大都能拓宽混沌激光的带宽。

Time delay signature (TDS) of an external cavity and bandwidth are two important parameters that affect the applications of chaotic lasers. In this work, the output laser from a semiconductor laser with phase-modulated optical feedback was injected into another semiconductor laser with optoelectronic feedback. The two lasers thus formed an optically injected semiconductor laser subject to optoelectronic feedback, i.e., a master-slave laser system, which can be used to reduce the TDS of a chaotic laser and increase its bandwidth. The effects of external light injection coefficient, feedback intensity, and pumping factor on the TDS of the chaotic laser output from the system were numerically studied, and the influence of the TDS of the chaotic laser output from the master laser on the TDS of the chaotic laser output from the slave laser was investigated. Moreover, the bandwidth of the chaotic laser output was investigated based on the effective suppression of TDS. Results show that this scheme can effectively reduce the TDS of the chaotic laser, and increasing the external light injection coefficient, feedback intensity, and pumping factor can widen the bandwidth of the chaotic laser.