轴向受到随机弯曲的多模光纤的基频特性

• 作 者: 张明曦
• 出 处: 传输线技术
• 发表日期: 1981年05期
• 关键词: 多模光纤 基频 模式耦合 扩散方程 成缆 数值分析 传输特性 长度 变分法 纤芯

1.前言就多模光纤而言,在可能引起模式耦合的各种原因中,最主要的原因是轴向的随机弯曲。这种随机弯曲是在纤维成缆以及敷设该光缆过程中自然产生的,因而不能忽视它对光缆传输特性的影响,为此,在本报告中,我们试图通过数值分析,从理论上求出轴向受到随机弯曲的多模光纤的基频特性。本分析中,利用我们导出的分析方法来解功率扩散方程,求出其基带响应。在介析过程中,根据弯曲长度的大小,我们决定把随机弯曲分为微观弯曲和宏观弯曲2种。一般,二者

1. Introduction For multimode fiber, the most important reason for the variety of causes that can cause mode coupling is axial random bending. This random bending is a natural consequence of fiber-laying and laying of the fiber and therefore can not ignore the effect it has on fiber optic cable transmission. For this reason, in this report we attempt to theoretically determine the axis Fundamental frequency characteristics of multimode fiber subjected to random bending. In this analysis, we use our derived analysis method to solve the power-dispersion equation and find the baseband response. In the analysis process, according to the size of the bending length, we decided to random bending into two kinds of micro-bending and macro-bending. General, both