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基于扩展的自旋反转模型,对光电负反馈下垂直腔表面发射激光器的偏振开关特性进行了数值仿真和理论分析.研究结果表明:对于不同的自旋反转率,反馈强度和延迟时间对激光器偏振开关特性产生较大影响.在慢自旋反转率下运行时,随着反馈强度的增加,开关点电流呈线性增加,导致X偏振模被压缩,这与报道的基于各向同性光反馈的情景相反,产生这一现象的原因是由于光电负反馈提高了X偏振模的阈值;延迟时间对开关点电流的影响随反馈强度的变化而不同.在快自旋反转率下运行时,反馈强度对开关点电流的影响与慢自旋反转率时的情形不同,开关点电流经历先增加后减小的过程,开关点电流受反馈强度的影响更加敏感;而延迟时间的影响规律和慢自旋反转率时相似.此外,还发现自发辐射噪声对激光器偏振开关特性有较大影响.
Based on the extended spin-inversion model, the numerical simulation and theoretical analysis of the polarization-switching characteristics of vertical cavity surface-emitting lasers with negative photoelectric feedback are carried out. The results show that for different spin-inversion rates, feedback intensity and delay time pair Laser polarization switch characteristics have a greater impact.When operating at slow spin-inversion rate, as the feedback strength increases, the switching point current increases linearly, resulting in X-polarization mode is compressed, which is reported based on the isotropic light In contrast to the feedback scenario, the reason for this phenomenon is that the photo-negative feedback increases the threshold of the X-polarization mode; the effect of the delay time on the switch-point current varies with the feedback strength. When operating at a fast spin-inversion rate , The influence of feedback intensity on switching current is different from the case of slow spin-inversion rate, the switching current first increases and then decreases, and the switch-point current is more sensitive to the feedback intensity. The influence law of delay time Similar to the slow spin-inversion rate, spontaneous emission noise has also been found to have a significant effect on the polarization switching characteristics of the laser.