光电负反馈下单向耦合注入垂直腔表面发射激光器的混沌同步特性研究

Chaotic synchronization performances of two unidirectionally coupled VCSELs subject to negative optoelectronic feedback

基于自旋反转模型(SFM),对光电负反馈下单向耦合注入垂直腔表面发射激光器(VCSEL)的混沌同步特性进行了数值仿真和理论分析.研究结果表明:随着反馈强度的增加,激光器输出功率呈现两个不同的混沌区域.在单一偏振模区域,能实现很好的同步性,但接近两模共存时,同步质量急剧下降;在两模共存区域,偏振模的连续性差,同步质量不理想.两模共存时的同步质量比单一偏振模差的这一特性,与已报道的基于光反馈的情景相反.产生这一特殊现象的原因是光电负反馈诱发了偏振模竞争效应.此外,还发现内部参数的变化对两个混沌区域的选取有较大影响.

Based on the framework of the spin-flip model （SFM）, the synchronization performance of two unidirectionally coupled vertical-cavity surface emitting lasers （VCSELs） subject to negative optoelectronic feedback has been theoretically investigated. The results show that, with the increase of the feedback intensity, the laser output power displays two different chaos regions, i. e., singles-polarization mode region and mixed mode region. The polarized mode in the single mode region can achieve good synchronization, but sharply decline in the quality of synchronization close to the mixed mode region. Within the mixed-mode region, the continuity and quality of synchronization of polarized modes are not ideal. The fact that the synchronization quality of the mixed mode is worse than that of the single mode, is on the contrary to reported results based on optical feedback. The reason may be due to that negative optoelectronic feedback has induced the competion between the polarized modes. In addition, we have found changes in internal parameters have a great impact on the selection of two chaotic regions.