C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
49/77, 117/85
C03B 37/012 (2006.01) C03B 37/014 (2006.01) C03B 37/018 (2006.01) C03C 21/00 (2006.01) G02B 6/00 (2006.01)
Patent
CA 2019919
ABSTRACT The present invention provides a process for a dehydrating and purifying treatment by heating a porous glass preform for an optical fiber. In a first form, the process comprises passing the porous glass preform through a muffle tube having a SiC layer at least on its inner surface at a high temperature under an atmosphere comprising an inert gas and a silicon halogenide gas. In a second form, the process comprises a fluorine-doping treatment by heating a porous glass preform for an optical fiber comprising passing a porous glass preform through a muffle tube having a SiC layer at least on its inner surface at a high temperature under an atmosphere comprising a fluorine compound gas and an inert gas. In a third form, the process is for a vitrifying treatment by heating a porous glass preform for an optical fiber comprising passing the preform, which has been previously dehydrated and purified, through a muffle tube having a SiC layer at least on its inner surface at a high temperature under a gaseous atmosphere.
Ishikawa Shinji
Kanamori Hiroo
Kyoto Michihisa
Ohga Yuichi
Tsuchiya Ichiro
Kirby Eades Gale Baker
Sumitomo Electric Industries Ltd.
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