Title:
Optical fiber manufacturing method
Document Type and Number:
Japanese Patent JP5942630
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method capable of manufacturing an optical fiber having both low Rayleigh scattering loss and low OH absorption loss at low cost.SOLUTION: In a step of producing an optical fiber preform 2, the optical fiber preform 2 in which a power ratio of transmission light having the wavelength of 1.38 μm in a core-rod corresponding region of an optical fiber after wire drawing is 99.99975% or more is produced by adding a jacket layer having an average OH concentration of 10 wtppm or more around a core rod having an average OH concentration of less than 1 wtppb, and an OH concentration of 10 wtppm in a region having the thickness of 0.03 μm from the surface of the optical fiber 3 after the wire drawing. In a heating step, a temperature of the optical fiber 3 when entering the optical fiber 3 into a heating furnace 21 is 1400°C or more, a heating temperature of the optical fiber 3 in the heating furnace 21 is 2000°C or less, and a residence time of the optical fiber 3 in the heating furnace 21 is 0.005-1 second.
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Inventors:
Tatsuya Konishi
Tetsuya Nakanishi
Tetsuya Nakanishi
Application Number:
JP2012138706A
Publication Date:
June 29, 2016
Filing Date:
June 20, 2012
Export Citation:
Assignee:
Sumitomo Electric Industries, Ltd.
International Classes:
C03B37/027; C03B37/014; G02B6/02; G02B6/036
Domestic Patent References:
| JP2007011366A | ||||
| JP2003167144A | ||||
| JP2000335935A | ||||
| JP2008094633A | ||||
| JP2011057490A |
Attorney, Agent or Firm:
Yoshiki Hasegawa
Yoshiki Kuroki
Ichira Kondo
Masatoshi Shibata
Yoshiki Kuroki
Ichira Kondo
Masatoshi Shibata