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

1985-06-25

1987-05-12

Lindsay, Robert

Glass manufacturing

Processes

Forming product or preform from molten glass

65 3012, 65 13, 65 182, C03B 37027

Patent

active

046646906

ABSTRACT:
A method for producing a glass preform for an optical fiber comprising flame hydrolyzing a glass raw material in an oxyhydrogen flame to form glass fine particles, depositing the glass fine particles on a seed member to produce a solid or hollow cylindrical soot preform, dehydrating by holding the whole soot preform in an atmosphere containing a dehydrating agent kept at such temperature for such period of time that the diameter of the soot preform shrinks by at least 20%, and heating and sintering the dehydrated soot preform by introducing it from its one end in an atmosphere of a pure inert gas to produce a glass preform having a uniform distribution of refractive index along its length, from which glass preform, an optical fiber having attenuation of light transmission as low as 1 dB/km or less at a wavelength of 1.30 micrometer is fabricated.

REFERENCES:
patent: 4304583 (1981-12-01), Aronson et al.
patent: 4338111 (1982-07-01), Edahiro et al.
patent: 4367085 (1983-01-01), Sato et al.
patent: 4378985 (1983-04-01), Powers
patent: 4552576 (1985-11-01), Hara et al.

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