Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1988-04-25
1989-10-17
Schor, Kenneth M.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 182, 65 29, C03B 37018
Patent
active
048744166
ABSTRACT:
In place of the conventional rod-in-tube method, a novel method is proposed for the preparation of a high-quality base material of quartz glass for optical fibers according to which a glassy rod composed of the core portion of a larger refractive index and the first cladding layer of a smaller refractive index is first prepared by silica soot deposition by the flame hydrolysis of a gaseous silicon compound followed by dehydration and vitrification, and then the glassy rod is covered with a layer of further silica soot deposition which is subsequently converted to the second cladding layer by vitrification. The inventive base material for optical fibers is excellent in the geometry relative to the diameter of the core portion and thickness of the cladding layer as well as concentricity of the core and the cladding.
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Koya Kazuo
Yokokawa Kiyoshi
Goldberg Jules E.
Schor Kenneth M.
Shin-Etsu Chemical Co. , Ltd.
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