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基于扩展的自旋反转模型,对短外腔偏振旋转光反馈下1550 nm垂直腔面发射激光器的动力学特性进行了数值仿真和理论分析.研究结果表明:增加反馈强度会导致多个偏振开关现象出现,中等反馈强度下呈现丰富的动力学状态,譬如单周期、倍周期、准周期及混沌态,增加注入电流使Y方向线偏振模的工作区域被压缩;随着反馈延迟时间的增加,在弱光反馈时,偏振模跳变现象将会以特定的频率发生,施加中等的反馈强度将会导致模式跳变的频率增加,并且出现各种新的动力学状态,包括拍频单周期、拍频脉冲包络、拍频准周期和拍频混沌态.新动力学行为的出现是由于短外腔区激光器的动力学特性对相位变化非常敏感,从而使外腔模式间的拍频效应发挥了关键作用.此外还发现各种动力学状态之间会伴随模式间的跳变而发生相互跳变.
Based on the extended spin-inversion model, the numerical simulation and theoretical analysis of the 1550-nm vertical-cavity surface-emitting lasers with short outer-polarization rotating optical feedback are carried out. The results show that increasing the feedback intensity can lead to multiple polarization switches Phenomenon appears, the medium feedback intensity shows a wealth of dynamic state, such as single cycle, double cycle, quasi-periodic and chaotic state, increase the injection current so that Y-line polarization mode of the work area is compressed; with the feedback delay time increases, At weak light feedback, the polarization mode transition will occur at a specific frequency. Applying a moderate feedback strength will result in an increase in the frequency of mode transitions and various new kinetic states including beat single-cycle, Beat pulse envelope, beating frequency quasi-cycle and beating chaotic state.The new dynamical behavior is due to the fact that the dynamic characteristics of the laser in the short external cavity region are very sensitive to the phase change, so that the beat-frequency effect in the external cavity mode is exerted The key role.In addition also found that a variety of kinetic states will be accompanied by the transition between modes and mutual transition.