Method for producing glass preform for optical fiber

Details Method for producing glass preform for optical fiber Method for producing glass preform for optical fiber

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.

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