Preparation of fluoride glass optical preforms and fibers

Details Preparation of fluoride glass optical preforms and fibers Preparation of fluoride glass optical preforms and fibers

1989-01-03

1991-06-25

Kratz, Peter

Glass manufacturing

Processes

Forming product or preform from molten glass

65 312, 65900, 65DIG16, C03B 3714

Patent

active

050264095

ABSTRACT:
A preform for preparation of optical fibers is prepared by inserting a rod of a higher index of refraction fluoride glass into the bore of a hollow cylinder of a lower index of refraction fluoride glass fiber. This preform precursor is processed to collapse the hollow cylinder inwardly to form a composite preform having a high-refractive index core and a low-refractive index casing. The preparing of the glasses and processing to a preform are accomplished in a reactive environment that reacts and removes oxygen and hydrogen containing species from the glass, the reactive environment being, for example, Cl.sub.2, CCl.sub.4, SF.sub.6, BF.sub.3, CF.sub.4, or the decomposition products of a liquefied solid fluorocarbon. The preform is then drawn to an optical fiber.

REFERENCES:
patent: 4519826 (1985-05-01), Troy
patent: 4659352 (1987-04-01), Robinson
patent: 4668263 (1987-05-01), Tokota et al.
patent: 4749396 (1988-06-01), Hicks
patent: 4793842 (1988-12-01), Tokota et al.
patent: 4820322 (1989-04-01), Baumgert et al.

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