光纤阵列准直器设计及其发散角测量  

Design of fiber array collimator and measurement of its divergence angle

作　　者：刘若仙 赵士元 谷一英 谢日凡 赵明山 LIU Ruoxian;ZHAO Shiyuan;GU Yiying;XIE Rifan;ZHAO Mingshan(School of Mechanical Engineering,Dalian University of Technology,Dalian 116024,China;School of Optoelectronic Engineering and Instrumentation Science,Dalian University of Technology,Dalian 116024,China;Key Laboratory of Advanced Optoelectronic Technology of Liaoning Province,Dalian 116024,China)

机构地区：[1]大连理工大学机械工程学院,辽宁大连116024 [2]大连理工大学光电工程与仪器科学学院,辽宁大连116024 [3]辽宁省先进光电子技术重点实验室,辽宁大连116024

出　　处：《光学精密工程》2023年第1期89-98,共10页Optics and Precision Engineering

基　　金：中央高校基本科研业务经费资助项目(No.DUT21RC(3)085);国家重点研发计划资助项目(No.2019YFB2203201)。

摘　　要：传统基于单个固定折射率透镜和渐变式折射率透镜制备光纤阵列准直器的方法,存在阵元数扩展困难、封装工艺复杂且集成化困难等缺点。利用光学微透镜易阵列化且阵元特性一致性好等优点,提出了基于平凸微透镜阵列制备光纤阵列准直器的方法。根据高斯光学和矩阵光学理论,对光纤阵列准直器的准直特性进行了理论分析和仿真,确定了光纤阵列准直器的相关设计参数,据此加工制备了四阵元一维排布光纤阵列准直器,其阵元间距为250 μm。通过远场光斑法对光纤阵列准直器的主要性能参数远场发散角进行了测量,并采用蒙特卡洛法对测量不确定度进行了分析与评定。光纤阵列准直器各通道远场发散角的测量值分别为0.69°,0.67°,0.71°,0.68°,测量扩展不确定度为0.02°,该测量结果在设计容差(0.68±0.03)°之内。该光纤阵列准直器具有良好的准直特性,能够满足光纤通信系统中光纤阵列准直器小型化和集成化的需求。The optical fiber array collimator is a major component in optical fiber communication systems, and its development is gradually moving toward array and integration. The traditional method of constructing a fiber array collimator is based on single-fixed and graded index lenses. It has disadvantages, such as difficulties in integrating and expanding the number of array elements and a complex packaging process. In this paper, a method of fabricating a fiber array collimator based on a plano-convex microlens array is proposed. The method utilizes the advantages of easy arraying of optical microlenses and good uniformity of array element characteristics. The theories of Gaussian and matrix optics were applied to analyze and simulate the collimation characteristics and determine the relevant design parameters of the fiber array collimator. A fiber array collimator with an array pitch of 250 μm is fabricated in this study. The far-field divergence angle is the main performance parameter measured using the far-field spot method. The measurement uncertainty is analyzed and evaluated using the Monte Carlo method. The measured values of farfield divergence angles of each channel in the fiber array collimator are 0. 69°, 0. 67°, 0. 71°, and 0. 68°, respectively, and the measurement expansion uncertainty is 0. 02°, which is within the design tolerance limit of(0. 68±0. 03)°. The optical fiber collimator has good collimation characteristics and can meet the requirements of miniaturization and integration in the field of optical communication.

关 键 词：光纤通信 光纤阵列准直器 微透镜阵列 远场发散角 不确定度分析 

分 类 号：TN929.11[电子电信—通信与信息系统]