Method of manufacturing optical fibre preforms

Details Method of manufacturing optical fibre preforms Method of manufacturing optical fibre preforms

1978-03-17

1979-08-21

Kellogg, Arthur D.

Glass manufacturing

Processes

Forming product or preform from molten glass

65110, 65DIG7, 65DIG16, C03B 3702, C03C 2502

Patent

active

041652240

ABSTRACT:
In the manufacture of silica optical fibers a tube having an internal coating of a volatile dopant is locally heated by a hot zone repeatedly traversed along its length to promote shrinkage and finally collapse of the tube bore. During the shrinkage prior to the final collapse traversal a gas flow of oxygen and a halide of the volatile dopant is maintained through the tube in order firstly to provide a small overpressure to ensure circularity in the shrinkage and secondly to compensate for the tendency for dopant to be lost by volatilization.

REFERENCES:
"Preparation of Low Loss Optical Fibers Using Simultaneous Vapor Phase Deposition and Fusion" by MacChesney et al., pp. 6--40 to 6--45 of 10th International Congress on Glass, 1974, Bell Laboratories, Murray Hill, N.J., 07974, USA.

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