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 37/01 (2006.01) C03B 37/014 (2006.01)

Patent

CA 1242617

- 1 - Abstract: The invention provides an optical fiber comprising a core essentially made of quartz and a cladding made of fluorine-added quartz. Such an optical fiber can be fabricated with good productivity from a glass preform produced by a method comprising maintaining a hollow cyylindrical porous glass preform in a first high tem- perature atmosphere comprising at least one fluorine- containing compound while flowing a cooling gas through the central hollow part of the porous glass preform to graduate the amount of fluorine added to the glass particles in the radial direction of the porous glass preform, and then sintering the porous glass preform in a second high temperature atmsophere kept at a temperature higher than that of the first high temperature atmosphere in order to make the preform transparent.

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