光注入和光电反馈联合作用下垂直腔表面 发射激光器的动力学特性研究

基于自旋反转模型, 研究了垂直腔表面发射激光器(VCSEL) 在光注入和光电反馈共同作用下的动力学特性. 研究结果表明: 一个受到主VCSEL光注入的副VCSEL, 在同时存在光电正反馈时, 其输出的两个线偏振模式(X和Y偏振模) 可呈现周期、 倍周期、 多周期、 混沌等丰富的动力学状态, 且两偏振模动力学态的演化路径存在差异. 各动力学状态在由反馈强度f与注入强度η 所构成的参数空间的分布区域随着主、 副VCSEL 的频率失谐Δν(Δν=ν_m-ν_s, ν_m, ν_s 分别为主、 副VCSEL自由运行时的振荡频率) 的变化而发生改变. 当Δν为正失谐时, 呈现混沌的区域相比零失谐和负失谐时有明显的扩展, 即副VCSEL能在更大的参数范围内实现混沌输出. 对于特定的频率失谐, 分析了光电正反馈强度f和光注入强度η对混沌输出带宽的影响. 通过合理选择反馈强度以及注入强度, 可使副VCSEL混沌输出带宽显著增加.

Dynamics of vertical-cavity surface-emitting laser subject to optical injection and positive optoelectronic feedback

Based on the spin-flip model(SFM),we theoretically investigate the dynamics of a vertical-cavity surface-emitting laser(VCSEL) subject to optical injection and positive optoelectronic feedback.The results show that under the joint action of positive optoelectronic feedback and optical injection from a master VCSEL(M-VCSEL),two polarization modes of a slave VCSEL(S-VCSEL) will show many dynamic states such as period one,period two,multi-period and chaos,and the evolution routes of these states are different for two polarization modes.Mapping of dynamic region as a function of feedback strength / and injection strength 77 is varied with frequency detuning between M-VCSEL and S-VCSEL△v(△v = v_m - v_s,where v_m and v_s are the free-running frequencies of M-VCSEL and S-VCSEL,respectively).Compared with the case for zero or negative frequency detuning,the region of chaotic state is expanded significantly under positive△v.For a fixed△v,the influences of f andηon the chaotic bandwidth of S-VCSEL are discussed.Through selecting proper f andη,chaotic bandwidth of S-VCSEL can be improved obviously.