C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
117/85, 49/9
C03C 25/00 (2006.01) C03B 37/014 (2006.01)
Patent
CA 1123684
Powers 3 METHOD OF MAKING DRY OPTICAL WAVEGUIDES Abstract of the Disclosure A method of making low loss glass optical waveguides, wherein at least one coating of glass soot is deposited by the flame hydrolysis process of a starting member. The starting member is removed from the soot preform leaving an aperture therein. While the preform is heated to i s con- solidation temperature, an atmosphere including a drying agent is caused to flow into the aperture and through the porous preform, thereby removing water from the preform while the soot is consolidated to form a dense glass article. The atmosphere contains optimal amounts of oxygen and drying agent to minimize leaching of dopant oxide from the preform. Since some of the dopant oxide is leached from the preform near the aperture, the central portion of the preform is initially provided with an excess amount of dopant oxide. The resultant draw blank is drawn into an optical waveguide filament.
317620
Corning Glass Works
Gowling Lafleur Henderson Llp
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