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

1987-12-21

1988-12-27

Schor, Kenneth M.

Glass manufacturing

Processes

Forming product or preform from molten glass

65900, 65DIG16, C03B 37014, C03B 37027

Patent

active

047938420

ABSTRACT:
A rod-in-tube method for producing a glass preform for use in the fabrication of an optical fiber, which comprises steps of inserting a glass rod constituting a core material in a glass tube constituting a cladding material, heating the rod-tube composite by an outer heating source with introducing, in the gap between the rod and the tube, a gaseous mixture containing a silicon halogenide, a fluorine-containing compound and oxygen gas in which a ratio of silicon and fluorine (Si/F) is larger than 1/300 and smaller than 1/5, and heating and fusing the composite at a temperature not lower than 1,900.degree. C. with filling the gap by a gaseous mixture comprising a halogen-containing compound and oxygen gas; from which glass preform, an optical fiber with low attenuation of light transmission, particularly in a long wavelength range, is fabricated.

REFERENCES:
patent: 4264347 (1981-04-01), Shintani
Patent Abstracts of Japan, Unexamined Applications C Field, vol. 4, No. 113, Aug. 13, 1980.

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