Preparation of a preform of optical fibers

Details Preparation of a preform of optical fibers Preparation of a preform of optical fibers

1993-10-04

1994-11-22

Lindsay, Robert L.

Glass manufacturing

Processes of manufacturing fibers, filaments, or preforms

Process of manufacturing optical fibers, waveguides, or...

65 174, C03B 37023

Patent

active

053665317

ABSTRACT:
An improvement is proposed in the method for the flame hydrolysis of a silicon-containing gas, e.g., silicon tetrachloride, to produce fine silica particles to be deposited on a substrate in a process for the preparation of a silica glass preform of optical fibers by using a fivefold concentric multiplex-tube burner nozzle. In contrast to the conventional way for the flame hydrolysis in which the center or first nozzle opening of the burner serves for ejection of a mixture of silicon tetrachloride and oxygen and hydrogen is ejected from the third nozzle opening while argon is ejected from the second nozzle opening inbetween, the gas ejected from the second nozzle opening is, instead of argon alone, a mixture of oxygen and argon in a specified mixing proportion so that deposition of silica particles on the nozzle end can be prevented even when the feed rate of silicon tetrachloride is relatively high.

REFERENCES:
patent: 4618354 (1986-10-01), Suda et al.
patent: 4826520 (1989-05-01), Kawazoe et al.

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