光纤陀螺用光收发组件的SLD准直系统设计

SLD collimation system design for free-space optical transceiver module of fiber optic gyroscope

在光纤陀螺向高精度和小型化的方向发展的背景下,针对光纤陀螺用光收发组件对器件小型化、易集成的特殊要求和超辐射发光二极管SLD(Super-Luminescent Diode)出射光束的特点,提出利用双焦距双柱透镜准直整形系统对SLD光束进行准直、整形.根据椭圆高斯光束的特性,利用几何光学法和矩阵光学法,分别对该双柱透镜的重要结构参数(曲率、柱透镜厚度)进行了详细的计算及分析,并且利用矩阵光学法得出系统的光线传输矩阵,对该双柱透镜的结构参数进行优化设计.利用CODEⅤ光学仿真软件对优化后的系统进行仿真,得出准直整形后光束在xOz平面和yOz平面内的发散角仿真值均低于0.05 mrad,且光斑为圆形.

With the development of highly accurate and compact fiber optic gyroscope,based on the special demands of compactification and integration to the transceiver module used in the fiber optic gyroscope and the characteristic of superluminescent diode（SLD） beam,an array of asymmetrical cylindrical lens collimation optical system was proposed,which could be used to form collimating and spherical the beam.The collimation optical system was thoroughly studied.The configuration parameters（i.e.curvature,thickness） were minutely calculated using the analytical method of both the geometry and matrix optics.Furthermore,in the use of the analytical method of matrix optics the optical transmission matrixes were deduced to optimize the configuration parameters of cylindrical lens.The system was simulated in CODE Ⅴ software and the conclusion was elicited.Theoretically,the radiation angle of SLD beam can be compressed under 0.05 mrad.