Method of manufacturing a preform exhibiting a precisely defined refractive index profile by means of a chemical vapour deposition (CVD) technique

摘要

The present invention relates to a method of applying glass layers, which may or may not be doped, to the interior of a substrate tube by means of a chemical vapour deposition (CVD) technique, using a reactive gas mixture, in order to obtain a preform that exhibits a precisely defined refractive index profile, which method comprises a number of steps.