C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
117/85
C03B 37/025 (2006.01) C03B 37/014 (2006.01)
Patent
CA 1248416
- 1 - Abstract The invention provides a method for producing a glass preform for optical fibers by heating a glass soot preform consisting of fine glass particles made mainly of silicon oxide. The method comprises the steps of: (1) heating the glass soot preform to dehydrate it and to remove impurities therefrom; (2) heating the glass soot preform in a gas atmosphere containing at least fluorine or a fluorine-based compound to add fluorine to the glass soot preform; and (3) heating the glass soot preform to make it transparent. An optical fiber having superior transmission characteristics can be prepared from a transparent preform prepared by this method.
465912
Inagaki Nobuo
Kyoto Michihisa
Shimba Hiroshi
Tanaka Gotaro
Watanabe Minoru
Kirby Eades Gale Baker
Nippon Telegraph And Telephone Corporation
Sumitomo Electric Industries Ltd.
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