Method of changing the spot diameter of single-mode step-index fibers, and single-mode fiber coupling unit made by said method

摘要

In a method of changing the spot diameter of single-mode step- index fibers, a single-mode step-index fiber of a given length is heated below its melting point for a defined time in accordance with a temperature profile which varies, preferably linearly, over said length. In this manner, coupling losses between a single-mode laser and a single- mode step-index fiber and between single-mode step-index fibers with different parameters can be reduced to a minimum.