CAJ | 학술논문

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.
기우확전적자선반전모형,대광전부반궤하수직강표면발사격광기적편진개관특성진행료수치방진화이론분석.연구결과표명:대우불동적자선반전솔,반궤강도화연지시간대격광기편진개관특성산생교대영향.재만자선반전솔하운행시,수착반궤강도적증가,개관점전류정선성증가,도치X편진모피압축,저여보도적기우각향동성광반궤적정경상반,산생저일현상적원인시유우광전부반궤제고료X편진모적역치;연지시간대개관점전류적영향수반궤강도적변화이불동.재쾌자선반전솔하운행시,반궤강도대개관점전류적영향여만자선반전솔시적정형불동,개관점전류경력선증가후감소적과정,개관점전류수반궤강도적영향경가민감;이연지시간적영향규률화만자선반전솔시상사.차외,환발현자발복사조성대격광기편진개관특성유교대영향.
@@@@Using the extended spin-flip model, we theoretically investigate the polarization switching dynamics of a vertical-cavity surface-emitting laser subject to negative optoelectronic feedback. The results show that when the laser operates at two different the spin-flip rates, the feedback intensity and delay time have great influence on polarization switching dynamics. At a slow spin-flip rate, with the increase of feedback intensity, switching current increases linearly, that the X polarization mode is compressed is contrary to the reported results based on isotropic optical feedback. The reason may be due to the fact that the negative optoelectronic feedback improves the X polarization mode threshold; the effect of delay time will vary with feedback intensity. At a fast spin-flip rate, the effect of feedback strength is different from at a slow spin-flip rate, the switching point current undergoes a process in which the current increases first and then decreases gradually, the switching point current is more sensitively dependent on the feedback strength;while effect of the delay time is similar to that at a slow spin-flip rate. In addition, we find that the spontaneous emission noise has a great influence on polarization switching dynamics.