在三腔镜近似的条件下,利用等效腔模型,完成了光纤光栅外腔半导体激光器(FBG-ECL)的理论建模。利用光纤布拉格光栅相关理论,对FBG-ECL模型进行了修正,着重考虑了光纤布拉格光栅的反射率分布、中心波长偏移以及边模抑制比对FBG-ECL性能的影响。对FBG-ECL的等效反射率、阈值增益和线宽特性进行了数值分析。结果表明,在考虑光纤布拉格光栅中心波长与设计波长偏移量、光栅反射率分布以及边模抑制比后,等效腔理论模型更加符合实际情况,可以更为准确地分析实际情况中FBG-ECL的相关特性,对设计应用于FBG-ECL的光纤光栅有一定的指导意义。

One-dimensional model of the fiber Bragg grating external cavity semiconductor laser(FBG-ECL) has been found in this paper using equivalent cavity model which is under the circumstance of three cativy mirrors.We corrected the traditional model and numerical analysed with the theories of fiber Bragg grating.We paied our attention to the reflectivity distribution,central wavelength and side-mode suppression ratio(SMSR) of fiber Bragg grating,and numercal analised equeivalent reflectivity,threshold gaind and linewidth of the FBG-ECL.The result of the analysis showed that it has more correspondence to reality when taking into account the reflectivity distribution of fiber gratings.