基于远场可变孔径的贝塞尔函数拟合法求单模光纤模场直径  

Mode field diameter measurement of single mode fiber using Bessel function fitting method based on variable aperture in far field

作　　者：胡越 项华中[1] 赵仁燕 涂建坤[2] 郑刚[1] Hu Yue;Xiang Huazhong;Zhao Renyan;Tu Jiankun;Zheng Gang(Interventional Medical Device Engineering Research Center,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Cable Research Institute,Shanghai 200093,China)

机构地区：[1]上海理工大学上海市介入医疗器械工程研究中心,上海200093 [2]上海电缆研究所,上海200093

出　　处：《光电工程》2021年第4期52-59,共8页Opto-Electronic Engineering

基　　金：国家自然科学基金青年科学基金资助项目(61605114)。

摘　　要：模场直径作为单模光纤的一个重要参数,远场可变孔径法是GB.15972.45-2008中推荐的测量方法。本文分析了单模光纤中传播光场的分布,其中光场的模式行为是亥姆霍兹方程的解,理论上应满足贝塞尔函数。对此,本文基于远场可变孔径法提出一种利用贝塞尔函数拟合光纤出射光场分布,进而由拟合得到的模场分布曲线计算模场直径。与目前常用的远场可变孔径法相比,在测量数据正常时,本方法与常用方法测量精度相当。当测量数据存在误差时,本方法仍能保证测量结果的稳定性与准确性。The mode field diameter is an important parameter of single-mode fiber,and the GB.15972.45-2008 recommends using the far-field variable aperture method to measure it.This paper analyzes the distribution of the propagating light field in a single-mode fiber.The mode behavior of the light field is the solution of the Helmholtz equation,which in theory should satisfy the Bessel function.In this regard,a method using Bessel function to fit the optical field distribution of the fiber based on the far-field variable aperture method is proposed,and the mode field diameter is calculated from the fitted mode field distribution curve.Compared with the commonly used far-field variable aperture method,when the measurement data is normal,this method has the same measurement accuracy.When there are errors in the measurement data,this method can still ensure the stability and accuracy of the measurement results.

关 键 词：光纤 模场直径 远场可变孔径法 贝塞尔函数拟合 模场分布 

分 类 号：TN818[电子电信—信息与通信工程]