Research on Coupling Characters of the Linear Polarized Mode between Two Multi-mode Silica Circular Waveguide

摘要

Based on fiber coupling equation, this paper discusses the character of linear polarized mode coupling between two multi-mode silica circular waveguides which have the same dopant distribution. The Eigen values of linear polarized mode U, W are calculated based on the Eigen value equations. According to the numerical calculation, coupling coefficient and coupling length in different coupling angles are given, and the method to improve the efficiency of multimode fiber coupling is summarized.