Optical fiber preform, optical fiber, and manufact

专利名称：Optical fiber preform, optical fiber, and

manufacturing methods thereof

发明人：Tomohiro Ishihara申请号：US10898968申请日：20040727

公开号：US20050031279A1公开日：20050210

专利附图：

摘要：A method of manufacturing an optical fiber preform and an optical fiber at alower cost than conventional manufacturing methods, and an optical fiber produced bysuch method. A soot glass deposit body is produced such that the diameter D of a crude

preform, which is made by consolidating the soot glass deposit body, satisfies theexpression 0.95 J≦D (whereas, D≠J) relative to the cladding diameter J of an optical fiberpreform, the cladding diameter J being determined by the diameter and the refractiveindex of the core of the crude preform. Subsequently, an optical fiber preform is made bymodifying the diameter D of the crude preform so as to coincide with J. Such modificationis done by reducing the diameter of the crude preform or by depositing additional fineglass particles. The crude preform on which additional fine glass particles are depositedis treated as an optical fiber preform in a state as it is, and drawn into an optical fiber.Thus, the process is simplified and the manufacturing cost can be reduced. In a radialcross-section of an optical fiber preform and an optical fiber fabricated according to thepresent invention, there is no boundary line layer in the cladding region, or a boundaryline layer is seen only in a region distanced by equal to or more than 0.95 times thediameter thereof.

申请人：Tomohiro Ishihara

地址：Kanagawa JP

国籍：JP

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