光纤光栅外腔半导体激光器的理论和实验分析

从耦合模理论出发，结合激光原理，研究了光纤光栅外腔半导体激光器(FBG-ECL)的理论模型．得到光纤光栅反射率的解析解。利用速率方程理论讨论FBG-ECL的高频响应特性。根据等效腔模型．讨论了耦合系数对FBG-ECL阈值特性的影响。指出存在最佳光纤光栅反射率．使得激光器不仅功率输出大，而且边模抑制比高。最后实测了不同反射率情况下激光器的激射光谱。

Theory and Experiment Analysis of Fiber Grating External Cavity Semiconductor Lasers

The theory model of fiber Bragg grating external cavity semiconductor lasers(FBG-ECL) is studied based on mode coupled theory and principle of lasers firstly,the analytic solution of fiber grating reflectivity is given in this paper.Using rate equations,the high frequency response characteristic of FBG-ECL is taken into account.Utilizing equivalent external cavity approximation model,the influence of coupling coefficient on the threshold gain of FBG-ECL is discussed.Adopting best peak reflectivity will make FBG-ECL having high output power and high fine sidemode suppression ratio.Lastly,the output spectrum of FBG-ECL in different peak reflectivity are obtained practically measured.