Process for producing glass preform for optical fiber

摘要

A process for producing a porous glass preform for optical fiber by depositing fine glass particles on an outer surface of a glass material while moving the glass material, including the steps of: preheating a portion of the glass material to clean the portion of the glass material in an apparatus for depositing fine glass particles; and depositing fine glass particles on the portion of the glass material cleaned by the preheating, in the apparatus for depositing fine glass particles. The preheating is preferably carried out by use of an oxyhydrogen burner or an electric resistance heater. The preheating atmosphere may contain water vapour or steam.