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1. (WO2018042758) METHOD FOR MANUFACTURING OPTICAL FIBER

Pub. No.:    WO/2018/042758    International Application No.:    PCT/JP2017/016972
Publication Date: Fri Mar 09 00:59:59 CET 2018 International Filing Date: Sat Apr 29 01:59:59 CEST 2017
IPC: C03B 37/027
G02B 6/02
Applicants: FUJIKURA LTD.
株式会社フジクラ
Inventors: KITAMURA Takayuki
北村 隆之
Title: METHOD FOR MANUFACTURING OPTICAL FIBER
Abstract:
The present invention includes a drawing step P1 of drawing an optical fiber base material 1P in a draw furnace 110 and an annealing step P3 of annealing an optical fiber 1 drawn in the drawing step P1. In the annealing step P3, the optical fiber 1 is passed through a plurality of annealing furnaces 121, with the temperature difference between the temperature of the optical fiber 1 when the optical fiber 1 enters the annealing furnaces 121 and the fictive temperature of the glass that constitutes the core of the optical fiber 1 being 300°C or less, and the optical fiber 1 is annealed for 0.01 seconds or more in the annealing furnaces 121 such that the temperature of the optical fiber 1 is in the range of 1300 to 1800°C.