Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1982-07-26
1984-06-12
Fisher, Richard V.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 182, 65 31, 65 32, C03B 37025
Patent
active
044539614
ABSTRACT:
A glass optical waveguide preform is formed by depositing first and second coatings of glass soot on a mandrel. The characteristics of the first coating are such that it can ultimately form the core of an optical fiber. The core-clad diameter ratio of the preform is greater than that necessary to provide the desired core-clad diameter ratio of the resultant fiber. The mandrel is removed and the porous preform is consolidated. The preform aperture is etched, rinsed and dried. One end of the preform is heated and pinched to close the aperture. The aperture is evacuated, and the remaining end of the preform is heated, the corresponding end of the aperture being caused to close. An intermediate fiber is drawn from the resultant consolidated preform, the entire aperture being closed during drawing due to the low pressure within the aperture. The intermediate fiber is severed into sections, each of which functions as a mandrel for the deposition of a further coating of cladding soot. The resultant composite article is consolidated and drawn into an optical fiber.
REFERENCES:
patent: 4251251 (1981-01-01), Blankenship
patent: 4257797 (1981-03-01), Andrejco et al.
patent: 4298365 (1981-11-01), Bailey et al.
patent: 4344670 (1982-08-01), Blankenship
Corning Glass Works
Fisher Richard V.
Simmons, Jr. W. J.
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