METHOD AND APPARATUS FOR MANUFACTURING PREFORM FOR OPTICAL FIBER

摘要

PROBLEM TO BE SOLVED: To lead a gas flow of a gas supplying unit upward of a chamber from below of a starting member such as a core material so that the gas flow is not directly blown onto a soot deposited body.

SOLUTION: When an optical fiber preform is formed by forming an outer layer part 3 such as a clad part by subjecting silicon tetrachloride to flame hydrolysis to form glass fine particles by using an oxyhydrogen flame burner 6 installed below the starting member 4 and depositing the formed glass fine particles on the starting member 4 in a chamber 2, the gas supplying units 7 are each installed at the both ends of the oxyhydrogen flame burner 6 so that the gas flow is blown obliquely upward to the wall surface 2b of the chamber 2 from below of the starting member 4 and led to the upper part of the chamber 2 in order to blow the gas flow upward of the chamber 2 from below of the starting member 4 by each gas supplying unit and to deposit the glass fine particles.

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