OPTICAL FIBER AND ITS PRODUCTION

摘要

PURPOSE:To increase overage braking length and to improve strength by using synthetic quartz having 0.01-1wt% chlorine concn. for the surface layer of a quartz optical fiber 10. CONSTITUTION:Pulverous glass particles are stuck by a flame hydrolysis method to the base material of the quartz optical fiber and thereafter the base material is heat-treated in a gaseous chlorine atmosphere. The synthetic quartz having the chlorine concn. ranging 0.01-1wt% is formed on the surface of the base material by such heat treatment. The atmosphere contg. gaseous chlorine at 0.1-7mol% concn. is preferably used in the stage of the above-mentioned heat treatment.