Manufacturing method for optical fiber and manufacturing apparatus for optical fiber

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United States of America Patent

PATENT NO 11667560
SERIAL NO

17266226

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Abstract

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A manufacturing method for an optical fiber, includes: drawing, while heating in a heating furnace, a lower end of an optical fiber preform that is to be an optical fiber having a core consisting of silica glass containing a rare earth element compound. The heating furnace has a temperature profile in which a temperature of the heating furnace increases to a maximum temperature Tmax and then decreases from an upstream side of the heating furnace toward a downstream side of the heating furnace. The temperature profile has a changing point at which the temperature decreases more steeply on the downstream side from a position where the maximum temperature Tmax is reached. At the maximum temperature, a temperature of the silica glass is higher than or equal to a glass transition temperature and the silica glass is in a single phase.

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Patent Owner(s)

  • FUJIKURA LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hosokawa, Tsukasa Chiba, JP 5 13

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