半导体激光与高双折射光纤基模的耦合

Coupling Between Laser Diodes and Base-modes in Highly Birefringent Optical Fibers

在双模干涉型光纤传感器中,为了消涂光纤引导段的敏感效应,需要选择性地激发光纤的基模,本文对半导体激光器(简称LD)与光纤基模的耦合进行了理论上的分析。在高斯分布漠场假设的基础上,给出了激光束腰半径和光纤基模模场半径的表达式,以及利用透镜进行两模式匹配的具体光学计算公式。据此进行的LD与高双折射光纤偏振模(基模的一个偏振分量)的耦合实验得到了28％ 耦合效率。文章最后讨论了半导体激光器的椭圆性和固有象散以及光反射对耦合造成的影响。

In dual-mode interieromatre optreof the ber sensors ,base-modes need to be taunched setectiv in order to semeflate the senstivity ofteading fiber.This paper anayzes ling between laser diode(LD) and base-rnode in opticai fiber. On the asumpton of Gausatian node sharps for the LD andfiber base-mode metds, formu as for determining the laser bean waist radius and the fiber basp-node radiu are given,and formulas forcalculat ing imaere reation of a coupting thick.en are given. A28% coupling efficiency of polarimalie mode in highly brefringentoptica fiber obtal experimentaly Last a discussion is given about LD astigmatism and feedback eifesis.