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

1991-01-14

1992-09-08

Jones, W. Gary

Glass manufacturing

Processes

Forming product or preform from molten glass

65 312, 65900, 65DIG16, C03B 3700

Patent

active

051455072

ABSTRACT:
A glass preform is produced by forming a glass soot composite body having a core portion consisting of a solid glass and a peripheral portion consisting of a porous glass mass, removing trapped gas and water from pores of the soot composite body by heating the soot composite body under a pressure lower than several ten Torr. at a temperature at which the porous glass mass is not vitrified, filling the pores in the porous glass mass of the soot composite body with a gas containing SiF.sub.4, the partial pressure of which is a function of the desired specific difference of refractive index, thus uniformly adding fluorine to the soot glass mass, and vitrifying the fluorine-added soot glass mass into a transparent glass mass to form a glass preform.

REFERENCES:
patent: 3868170 (1975-02-01), DeLuca
patent: 4125388 (1978-11-01), Powers
patent: 4165915 (1979-08-01), Rau et al.
patent: 4292063 (1981-09-01), Abe
patent: 4586943 (1986-05-01), Kyoto
patent: 4629485 (1986-12-01), Berkey
patent: 4832720 (1989-05-01), Watanabe et al.
patent: 4846867 (1989-07-01), Yokota et al.

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