Zhou Junping, Wang Ming
Opt Express. 2005 Mar 21;13(6):1848-54. doi: 10.1364/opex.13.001848.
The effects of self-mixing interference on gain-coupled (GC) distributed-feedback (DFB) lasers are analyzed. From coupled-wave theory, the oscillation frequency and threshold gain variations are theoretically deduced. The influences on self-mixing from the coupling length coefficient, the linewidth enhancement factor of the GC DFB laser, and the reflection coefficient of the external reflector are discussed along with numerical analysis and are compared with the effects of self-mixing interference of lambda/4 phase-shifted DFB lasers and Fabry-Perot (F-P) lasers. Our results show that high-accuracy self-mixing sensors can be obtained with GC DFB lasers.
分析了自混合干涉对增益耦合（GC）分布反馈（DFB）激光器的影响。从耦合波理论出发，理论推导了振荡频率和阈值增益的变化。讨论了耦合长度系数、GC DFB激光器的线宽增强因子以及外部反射器的反射系数对自混合的影响，并进行了数值分析，同时与λ/4相移DFB激光器和法布里-珀罗（F-P）激光器的自混合干涉效应进行了比较。我们的结果表明，使用GC DFB激光器可以获得高精度的自混合传感器。
