Method for the manufacture of a preform for drawing glass fibers

Details Method for the manufacture of a preform for drawing glass fibers Method for the manufacture of a preform for drawing glass fibers

1988-06-20

1989-06-27

Kellogg, Arthur

Glass manufacturing

Processes

Forming product or preform from molten glass

65 12, 65 13, 65 311, 65 31, 65 47, 65 48, 264 15, 156663, C03C 2502

Patent

active

048426270

ABSTRACT:
A method for the manufacture of a preform of barium containing heavy metal fluoride glass comprising a core and a jacket for drawing infrared light waveguides for optical communications technology by casting molten glass onto a predetermined body of solid glass. Hitherto, such a method was executed such that molten core glass was cast into a tube of jacket glass. In order to achieve thicker preforms, one proceeds such here that a solid row of the core glass is surrounded with molten jacket glass. The boundary surface between core and jacket of the generated preform can be improved in the method disclosed herein that the surface of the solid rod is etched before being surrounded with the jacket glass. A nearly perfect boundary surface is obtained by etching with a ZrOCl.sub.2 solution.

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Mitachi et al., "Fluoride-Glass Cladded Optical Fibers for Mid-Infra Red Ray Transmission", Electronic Letters (vol. 17, No. 17 8/20/81) pp. 591-592.
"Fluoride Glass Preforms Prepared by a Rotational Casting Process", Electronic Letters (vol. 18, No. 15, 7-22-82), pp. 657-658.
Advances in Mid-Infrared Fibers 100C-ECOC (1985 pp. 13-20), Tran.

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