Glass manufacturing – Processes of manufacturing fibers – filaments – or preforms – Process of manufacturing optical fibers – waveguides – or...
Patent
1971-09-20
1999-03-09
Nelson, Peter A.
Glass manufacturing
Processes of manufacturing fibers, filaments, or preforms
Process of manufacturing optical fibers, waveguides, or...
65410, 65472, 65473, C03B 37022
Patent
active
058794255
ABSTRACT:
A rod of etchable core glass material is inserted within a lead glass sleeve and heated in a furnace to drawing temperature and drawn from the furnace into a fiber. The lower end of the glass sleeve is collapsed around the core glass, thereby sealing the sleeve to the core rod. A vacuum is drawn on the space between the rod and the sleeve while in the furnace for outgassing the rod and sleeve and for eliminating gas tending to be trapped between the core fiber and its sleeve. In a subsequent step, a multitude of such glass fibers are assembled in a bundle, inserted within an evacuable glass sleeve, and heated to the softening point while drawing a vacuum on the bundle of fibers and the interior of the sleeve for further outgassing of the fibers. While the assembly is in the furnace, the exterior of the sleeve is pressurized to fuse the assembly of glass fibers together and to the sleeve to form a final boule which is subsequently transversely sliced to form plates which are etched to remove the core glass.
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Bright Patrick
Cole Stanley Z.
Litton Systems Inc.
Nelson Peter A.
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