Method for producing glass preform for optical fiber

Details Method for producing glass preform for optical fiber Method for producing glass preform for optical fiber

C - Chemistry, Metallurgy

03

B

117/85

C03B 37/018 (2006.01) C03B 37/014 (2006.01) C03C 13/04 (2006.01)

Patent

CA 1247467

- 1 - Abstract: Fluorine is selectively added to a cladding portion of a glass preform by producing a soot preform that comprises a core portion and a cladding portion under such conditions that the additive concentration or bulk density of the outer- most part of the core portion is larger than that of the inner part thereof. The soot preform is heated in an atmosphere containing fluorine or a fluorine-containing compound during at least some part of the heating step to obtain a transparent glass preform.

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