C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
117/85
C03B 37/018 (2006.01) C03B 20/00 (2006.01) C03B 37/014 (2006.01) G02B 6/00 (2006.01)
Patent
CA 1257814
- 1 - Abstract: A method for producing a glass preform for an optical fiber comprises flame hydrolyzing glass raw-material to from fine glass particles, depositing the fine glass particles on a starting substrate to produce a porous preform and dehydrat- ing the porous preform in an atmosphere comprising chlorine or a chlorine-containing compound and sintering the porous preform to produce a transparent glass preform. The invention is characterized in that the dehydration step or the dehydration/ sintering step is carried out in a muffle tube made of a material that contains: (a) MgO and Na2O in a total amount of no more than 0.2% by weight, (b) Fe2O3 in an amount of no more than 0.03% by weight, and (c) copper in an amount of no more than 0.3 ppm. A glass preform produced by this method can be used to produce an optical fiber containing smaller amounts of impurities and having improved attenuation of light transmission and mechanical strength.
487685
Ishiguro Yoichi
Kyoto Michihisa
Watanabe Minoru
Kirby Eades Gale Baker
Sumitomo Electric Industries Ltd.
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