METHOD OF CHANGING THE SPOT DIAMETER OF SINGLE-MODE STEP-INDEX FIBERS, AND SINGLE-MODE FIBER COUPLING UNIT MADE BY SAID METHOD

摘要

AbstractIn a method of changing the spot diameter of single-modestep-index fibers, a single-mode step-index fiber of agiven length is heated below its melting point for adefined time in accordance with a temperature profilewhich varies, preferably linearly, over said length.In this manner, coupling losses between a single-modelaser and a single-mode step-index fiber and betweensingle-mode step-index fibers with different parameterscan be reduced to a minimum.