C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
117/85
C03B 37/018 (2006.01) C03B 37/014 (2006.01)
Patent
CA 1238246
- 1 - Abstract The invention provides a method for producing a glass preform for an optical fiber comprising flame hydrolyzing a glass raw material in an oxyhydrogen flame to form fine glass particles, depositing the fine glass particles on a seed member to produce a solid or hollow cylindrical soot preform, dehydrating the soot preform by holding the whole preform in an atmosphere containing a dehydrating agent kept at such a temperature for such a period of time that the diameter of the soot preform shrinks by at least 20 %, and then heating and sintering the dehydrated soot preform by introducing it from one end into an atmosphere of a pure inert gas to produce a glass preform having a uniform dis- tribution of refractive index along its entire length. From such a glass preform, an optical fiber having an attenuation of light transmission as low as 1 dB/km or less at a wavelength of 1.30 micrometer can be fabricated.
487795
Ishiguro Yoichi
Kyoto Michihisa
Watanabe Minoru
Kirby Eades Gale Baker
Sumitomo Electric Industries Ltd.
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