Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1990-06-11
1991-08-13
Fisher, Richard V.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 182, 65DIG16, C03C 2502
Patent
active
050393251
ABSTRACT:
A fluorine-doped silica soot cylinder (11) is consolidated by containing it within an encapsulation structure (29) within a furance (21). The atmosphere within the encapsulation structure is kept substantially stagnant during the consolidating, and the volume enclosed by the encapsulation structure (29) is only slightly greater than the volume of the soot cylinder (11). A gap (52) between the volume enclosed by the encapsulating structure and the furnace is kept small enough to impede gas flow to a sufficient extent that the atmosphere within the encapsulating structure (29) is substantially stagnant during consolidation. During consolidation, fluorine concentration within the encapsulation structure (29) is uniformly distributed within the soot cylinder (11).
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"Fluorine Doping in the VAD Method and Its Application to Optical Fiber Fabrication", by H. Kanamori, N. Yoshioka, M. Kyoto, M. Watanabe and G. Tanaka, in ECOC 83-9th European Conference on Optical Communication, Edited by H. Melchior and A. Sollberger, (Elsevier Science Publishers B. V. (North Holland), 1983), pp. 13-16.
Miller Thomas J.
Monroe Douglas W.
Nicol David A.
Steele David B.
Anderson R. B.
AT&T Bell Laboratories
Bruckner John J.
Fisher Richard V.
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