Fujikura Limited

Nobuo Oozeki

Kentaro Ichii

Tomofumi Arai

A method for manufacturing a glass ingot includes preparing a supply system including a gasifier that gasifies a raw material compound and a burner that combusts the gasified raw material compound; adding an oxygen-containing gas to the raw material compound at a plurality of addition places including an upstream addition place located in the gasifier or on an upstream side of the gasifier and a downstream addition place located on a downstream side of the gasifier in which locations of the raw material compound in a flow direction are different in the supply system so as to form a raw material mixture; and adding the oxygen-containing gas at the upstream addition place so that a concentration of oxygen or a concentration of the raw material compound in the raw material mixture is not in a combustible range of the raw material mixture.

Method for manufacturing glass ingot

Provided is a method of manufacturing an optical fiber base material by an inside mounting method, including: a step of rotating and heating a glass tube fixed at two positions and supplying a gas into a through-hole of the glass tube, wherein in the step, the glass tube is warped so that an axis between respective fixed portions of the glass tube has a shape in which a catenary curve is reversed in the vertical direction.

Method of manufacturing optical fiber base material and method of manufacturing optical fiber

Provided is a method for manufacturing an optical fiber preform. In a premixing step, a source-material-containing gas containing organosilicon is mixed with premix-use oxygen gas so as to obtain a premixed source material gas. In the premixing step, the premix-use oxygen gas has a temperature greater than or equal to a liquefaction temperature of the organosilicon, the liquefaction temperature being determined depending on an amount of the organosilicon contained in the premixed source material gas.

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Sakura, Japan

Nobuo Oozeki