Forming optical fiber having abrupt index change

Details Forming optical fiber having abrupt index change Forming optical fiber having abrupt index change

1987-08-05

1989-03-07

Lindsay, Robert L.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 2, 65 311, 65 31, 65 61, C03B 37018, C03C 2500

Patent

active

048102768

ABSTRACT:
A method is disclosed for making a step-index optical fiber having a steep refractive index gradient between core and cladding. Core glass particles comprising a base glass and a refractive index-increasing dopant are deposited on a mandrel. The mandrel is removed and the resultant soot preform is consolidated to form a core preform having a dopant-poor surface region. The core glass preform is stretched and the hole therein is closed to form a core bait rod. Cladding glass soot is deposited on the core bait rod at a density which is at least 0.5 g/cc. This is accomplished by directing the flame from an auxiliary burner onto the core bait rod immediately prior to the deposition of cladding soot thereon. The resultant preform is consolidated and drawn into an optical fiber. In another embodiment, the etched core preform is overclad with a layer of cladding glass, and the composite preform is stretched prior to applying a second overclad layer.

REFERENCES:
patent: 4421539 (1983-12-01), Edahiro et al.
patent: 4494968 (1985-01-01), Bhagavatula et al.

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