Method for producing porous glass preform for optical fiber

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

1992-12-04

1993-08-24

Lindsay, Robert L.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 32, 65 13, C03B 37018

Patent

active

052384799

ABSTRACT:
The invention is a method for producing a porous preform for use in the fabrication of an optical fiber at least two burners synthesize glass soot particles, one of which generates a double-layer flame and one of which is used for forming a core part of the preform. The method comprises the steps of supplying SiCl.sub.4 and optionally GeCl.sub.4 to the inner flame of the double-layer flame, and only SiCl.sub.4 to an outer flame of the double-layer flame to flame hydrolyze the supplied compounds and synthesize glass soot particles. Compounds SiCl.sub.4 and GeCl.sub.4 as glass-forming raw materials are supplied to the burner for forming the core part of the preform by depositing the generated glass soot particles on the lower end of a rotating starting member. The generated porous preform comprises a core part containing at least partly GeO.sub.2, and a surface having a low concentration of GeO.sub.2 which reduces cracking or peeling.

REFERENCES:
patent: 4406684 (1983-09-01), Kawachi et al.
patent: 4421540 (1983-12-01), Nakahara
patent: 4426520 (1989-05-01), Kawazoe
patent: 4618354 (1986-10-01), Suda
patent: 4714488 (1987-12-01), Powers
patent: 4801322 (1989-01-01), Suda et al.

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