Method for making optical fiber preforms by collapsing a hollow

Details Method for making optical fiber preforms by collapsing a hollow Method for making optical fiber preforms by collapsing a hollow

1995-08-17

1996-11-26

Hoffmann, John M.

Glass manufacturing

Processes of manufacturing fibers, filaments, or preforms

Process of manufacturing optical fibers, waveguides, or...

65412, 65428, 65 36, 65 57, C03B 37012

Patent

active

055781063

ABSTRACT:
In accordance with the invention, a plurality of elongated refractory bodies are laminated together by placing the bodies in close adjacency, exposing the adjacent bodies to a plasma torch heat source, and moving the bodies longitudinal past the torch at a nonzero average rate which includes a reciprocating (e.g., oscillatory) component to longitudinally spread the zone of heating. Where the bodies are a rod to be laminated within a hollow tube, it is advantageous to reduce the air pressure between the rod and tube, thereby eliminating potential contaminants and, at the same time, biasing the tube to collapse against the rod. This method is particularly useful in laminating overcladding tubes to core rods to form optical fiber preforms.

REFERENCES:
patent: 3486870 (1969-12-01), Vervaart
patent: 4596589 (1986-06-01), Perry
patent: 4597785 (1986-07-01), Karbassiyoon
patent: 5171966 (1992-12-01), Fukuoka
patent: 5188648 (1993-02-01), Geittner
"Plasma-Collapsing: A New Alternative for High-Rate Collapsing of Fibre Preforms" XIII ELOL 87 Technical Digest vol. III pp. 63-66 A. H. E. Breuls et al.

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