Title: Method for producing glass proform for optical fiber
Application Number: 85107822 Application Date: 1985.09.26
Publication Number: 1000490 Publication Date: 1986.04.10
Approval Pub. Date: 1989.03.15 Granted Pub. Date: 1989.03.15
International Classifi-cation: C03B37/012
Applicant(s) Name: Sumitomo Electric Ind. Ltd. Address:
Inventor(s) Name: Masao Hoshikawa
Attorney & Agent: LIU YUANJIN LUO HONG
Abstract:
    An optical fiber comprising a core essentially made of quartz and a cladding made of fluorine added quartz is fabricated with good productivity from a glass preform produced by a method comprising maintaining a hollow cylindrical porous glass preform in a first high temperature atmosphere comprising at least one fluorine-containing compound with jetting a cooling gas through the central hollow part of the porous glass preform to grade the amount of fluorine to be added in the radial direction of the porous glass preform and then sintering the porous glass preform in a second high temperature atmosphere kept at a temperature higher than the first high temperature atmosphere to make it transparent.
Time: 4
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