光电负反馈下垂直腔表面发射激光器偏振开关特性研究  

Polarization switching dynamics of vertical-cavity surface-emitting laser subject to negative optoelectronic feedback

作　　者：王小发[1] 

机构地区：[1]重庆邮电大学光电工程学院,重庆400065

出　　处：《物理学报》2013年第10期182-188,共7页Acta Physica Sinica

基　　金：重庆邮电大学博士启动基金(批准号:A2012-24);重庆邮电大学青年科学基金(批准号:A2012-84)资助的课题~~

摘　　要：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.Using the extended spin-flip model,we theoretically investigate the polarization switching dynamics of a vertical-cavity surfaceemitting 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.

关 键 词：垂直腔表面发射激光器 偏振开关 光电负反馈 自发辐射噪声 

分 类 号：TN248[电子电信—物理电子学]