Method of manufacturing an optical fiber preform

Details Method of manufacturing an optical fiber preform Method of manufacturing an optical fiber preform

1987-03-20

1988-12-27

Lacey, David L.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 31, 65DIG16, C03C 2502, C03C 1700

Patent

active

047938439

ABSTRACT:
While collapsing the central duct in hollow glass optical fiber preforms, an etchant consisting of a mixture of oxygen and a fluorocarbon compound from the group C.sub.2 F.sub.6, C.sub.3 F.sub.8 and N-C.sub.4 F.sub.10 is passed through the duct. In particular, the etchant is passed through the duct only when the duct's diameter is 1 mm or smaller. The resulting solid preforms and optical fibers drawn therefrom do not have a central dip in the refractive index profile.

REFERENCES:
patent: 4356246 (1982-10-01), Tabei et al.
patent: 4425146 (1984-01-01), Izawa et al.
patent: 4453961 (1984-06-01), Berkey
patent: 4468413 (1984-08-01), Bachman
patent: 4481229 (1984-11-01), Suzuki et al.
patent: 4493721 (1985-01-01), Auwerda et al.

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