C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
117/85
C03B 37/018 (2006.01) C03B 37/014 (2006.01) C03C 13/04 (2006.01) G02B 6/00 (2006.01)
Patent
CA 1266403
- 1 - Abstract: The invention provides a method for producing a glass preform for an optical fiber comprising a core and a cladding containing fluorine. The method involves forming a porous glass layer of substantially pure quartz on an outer surface of a fused glass rod consisting of a central portion of substantially pure quartz and a peripheral portion of quartz glass containing fluorine, and heating a composite of the fused glass rod and the porous glass layer in an atmosphere containing fluorine to add fluorine to the porous glass layer and to make it transparent. By this method, the contamination of the glass with hydroxyl groups can be prevented and the light transmission characteristics of an optical fiber fabricated from the glass preform are improved.
482702
Kanamori Hiroo
Kyoto Michihisa
Mizutani Futoshi
Tanaka Gotaro
Yoshioka Naoki
Kirby Eades Gale Baker
Sumitomo Electric Industries Ltd.
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