外光反馈下VCSELs噪声灵敏性的理论研究

Theoretical Analysis on Noise Sensitivity of VCSELs with External Optical Feedback

从速率方程出发,仿真得到VCSELs在不同腔体结构、自发辐射因子和线宽限制因子情况下,相对强度噪声随外光反馈水平的变化规律。结果表明:减小电流孔径或线宽增强因子可以降低VCSELs对外光反馈的灵敏性,改变自发辐射因子对此影响不大。而传统边发射激光器不属于微腔结构,对外光反馈的抑制能力较弱。

Regarding to the microcavity structure of VCSELs the relationship between RIN and external optical feedback level with different aperture size, the spontaneous emission factor and the linewidth enhancement factor are analyzed. The results indicate that the sensitivity to external optical feedback of VCSELs can be reduced by using a smaller aperture size or linewidth enhancement factor. But the spontaneous factor has a negligible influence on the sensitivity. These characters can hardly hold true in edge-emitting lasers because of the limitations of their structure.