PRODUCTION OF PREFORM FOR OPTICAL FIBER

摘要

PURPOSE:To prevent the cracking and breaking of a preform for an optical fiber obtd. by depositing fine glass particles on the surface of a glass rod for a core. CONSTITUTION:Gaseous starting material for glass is oxidized and hydrolyzed in an oxyhydrogen flame, the resulting fine glass particles are deposited on the surface of a glass rod for a core to form a porous glass preform and a preform for an optical fiber is produced. At this time, the boundary between a layer of the deposited fine glass particles and the glass rod for a core is heated with a heating burner which moves back and forth in the axial direction.