Title:
METHOD FOR PRODUCING OPTICAL FIBER BASE MATERIAL, AND OPTICAL FIBER BASE MATERIAL
Document Type and Number:
WIPO Patent Application WO/2018/211880
Kind Code:
A1
Abstract:
A production method and others according to the present embodiment is provided with a structure for effectively preventing the occurrence of accidental spiking during the drawing of a fiber from the base material. In order to control the concentration of remaining He in the center part of the base material, a transparent glass rod that has a predetermined outer diameter and is already sintered but is not added with an alkali metal yet is annealed in a He-free atmosphere for an annealing time that is determined with reference to result data in which the relationship between a time period of annealing and a concentration of remaining He is previously recorded for every outer diameter. In the result data, an actually measured data of the concentration of remaining He in a produced optical fiber base material and a time of annealing are added as annealing treatment results.
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Inventors:
YONEMURA TAKUMI (JP)
YAMAZAKI NOBORU (JP)
TANAKA SATOSHI (JP)
YAMAZAKI NOBORU (JP)
TANAKA SATOSHI (JP)
Application Number:
PCT/JP2018/015562
Publication Date:
November 22, 2018
Filing Date:
April 13, 2018
Export Citation:
Assignee:
SUMITOMO ELECTRIC INDUSTRIES (JP)
International Classes:
C03B37/014; C03B8/04
Domestic Patent References:
| WO2016007693A1 | 2016-01-14 | |||
| WO2014119415A1 | 2014-08-07 | |||
| WO2015107931A1 | 2015-07-23 |
Foreign References:
| JP2013032241A | 2013-02-14 | |||
| JP2014166941A | 2014-09-11 | |||
| JP2013107792A | 2013-06-06 | |||
| JP2003300736A | 2003-10-21 | |||
| JPH07157327A | 1995-06-20 | |||
| JP2011057490A | 2011-03-24 |
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (JP)
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