为了研究半导体环形激光器在外部交叉光反馈情况下的非线性动力学特性, 基于环形激光器的速率方程, 采用数值仿真的方法, 得到了各种反馈参量下的时间序列及功率谱, 并研究了反馈系数对混沌带宽及时间延迟特性的影响。结果表明, 在各种不同外部反馈参量的情况下, 环形激光器展现了单周期、多周期、低频反相波动以及混沌态等丰富的动力学态; 在对称光反馈时, 可得到最大为3.7GHz的混沌带宽; 在时间不对称光反馈时, 产生的混沌信号的时延特征被很好地抑制。该研究结果可为环形激光器的实际应用提供一定的理论参考。

In order to study nonlinear dynamic characteristics of a semiconductor ring laser (SRL) under external cross-optical feedback, the time series and power spectra under various feedback parameters were obtained by numerical simulation based on the SRL rate equation, and the effect of feedback coefficient on chaotic bandwidth and time delay characteristics was studied. The results show that SRL exhibits a variety of dynamic states such as single period, multi-period, low-frequency anti-phase fluctuation and chaotic state under various external feedback parameters. The maximum chaotic bandwidth of 3.7GHz can be obtained with symmetric optical feedback, and the time delay characteristics of chaotic signals generated by time-asymmetric optical feedback are well suppressed. The results of this study can provide some theoretical reference for the practical application of SRLs.