Glass manufacturing – Processes of manufacturing fibers – filaments – or preforms – Process of manufacturing optical fibers – waveguides – or...
Patent
1996-06-28
1998-04-07
Hoffmann, John
Glass manufacturing
Processes of manufacturing fibers, filaments, or preforms
Process of manufacturing optical fibers, waveguides, or...
65412, 65 36, C03B 37012
Patent
active
057359270
ABSTRACT:
Core/clad glass optical fiber preforms free of bubbles and soot at the coclad interface are fabricated by inserting a glass core rod into a cladding glass tube sized so that space remains between them, sealing the top and bottom of the tube onto the core rod to form a sealed space between them which is relatively soot free and under a vacuum and then hot isostatically pressing the sealed composite to collapse the tube onto the rod and also collapse bubbles in the glass. Soot formation is avoided or minimized by purging the space with inert gas while the bottom of the tube is collapsed onto the rod and by sealing the top under a dynamic vacuum and at the lowest possible temperature to avoid soot formation without cracking the glass. The space is vacuum outgassed before the second seal is made. Chalcogenide fiber drawn from a preform made in this fashion exhibits very low transmission losses.
REFERENCES:
patent: 4908053 (1990-03-01), Nishii
patent: 5078768 (1992-01-01), Aggarwal
patent: 5352259 (1994-10-01), Oku
Aggarwal Ishwar
Miklos Robert
Pureza Pablo
Sanghera Jasbinder
Edelberg Barry A.
Hoffmann John
McDonnell Thomas E.
The United States of America as represented by the Secretary of
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