Light propagation in thermally fused biconical taper single-mode optical fiber couplers

Since the light propagation property of the currently produced single mode optical fiber couplers has not become clarified, there are various problems with their production method, namely in terms of their operability, stability, reproducibility and durability. The main purpose of this paper is to perform quantitative experiment on the major elements which is thought to influence light propagation of thermally fused biconical taper single mode optical fiber couplers. Furthermore, this paper aims to clarify light propagation property of single mode optical fiber couplers by calculating light output using mode coupled theory, in attempt to improving their production method.