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.
出处 《光电工程》 CAS CSCD 北大核心 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)。
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 optical fiber mode field diameter far field variable aperture method Bessel function fitting mode field distribution
