公开(公告)号：US20200299178A1

公开(公告)日：2020-09-24

申请号：US16894982

申请日：2020-06-08

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Shinichi ARAI ,  Shigeto MATSUMOTO

IPC: C03B37/12 ,  G02B6/02 ,  C03C25/105

Abstract: A method for screening an optical fiber core including a resin coating layer, includes: a pre-strain applying step of adding a tensile force while feeding a portion of the optical fiber core retained at both ends of the portion, and applying a pre-tensile strain larger than zero and smaller than a guaranteed tensile strain set as a guaranteed value; a guaranteed strain applying step of adding a tensile force while feeding the portion of the optical fiber core retained at both ends of the portion and applied with the pre-tensile strain, and applying the guaranteed tensile strain only for a predetermined time; and a guaranteed strain releasing step of releasing the optical fiber core from the guaranteed tensile strain.

公开(公告)号：US20190177204A1

公开(公告)日：2019-06-13

申请号：US16089182

申请日：2017-03-28

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Shinichi ARAI ,  Takeshi YAGI ,  Shigeto MATSUMOTO

IPC: C03B37/018

Abstract: A manufacturing method for an optical fiber preform includes forming a porous material made of fine silica glass particles surrounding a plurality of glass rods; and sintering the porous material, wherein the forming the porous material includes forming the porous material such that two or more of the plurality of glass rods protrude from the porous material, and the sintering includes supporting end portions of protruding sides of the two or more protruding glass rods collectively with a support jig, and performing the sintering. With this, a reduction in manufacturing yield is suppressed.