Increasing a fluorine compound flow rate during a VAD process

Details Increasing a fluorine compound flow rate during a VAD process Increasing a fluorine compound flow rate during a VAD process

1996-11-22

1999-04-20

Hoffmann, John

Glass manufacturing

Processes of manufacturing fibers, filaments, or preforms

With measuring, controlling, sensing, programming, timing,...

65397, 65414, C03B 37018

Patent

active

058955151

ABSTRACT:
In a soot-deposition container, raw material gas and at the tip of a starting glass rod, combustion gas, and carrier gas are supplied to a core-depositing burner and raw material gas, combustion gas, carrier gas, and gas for doping of fluorine are supplied to a cladding-depositing burner, thereby forming porous glass soot comprised of glass soot for core and glass soot for cladding. With growth of soot, the supply amount of the fluorine-doping gas is increased while supply amounts of the other gases are kept constant. Next, dehydration process and transparentizing process of soot are carried out to obtain a glass preform for optical fiber. Fabricated in this way is the glass preform for optical fiber having the silica glass portion doped with low-concentration fluorine with high uniformity in the growth direction.

REFERENCES:
patent: 4162908 (1979-07-01), Ray
patent: 4221825 (1980-09-01), Guerden
patent: 4586943 (1986-05-01), Kyoto
patent: 4627866 (1986-12-01), Kanamori et al.
patent: 5039325 (1991-08-01), Miller et al.
Derwent Abstract 86-316770/48 & JP610236626A Feb. 1997.

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