公开(公告)号：US20200379170A1

公开(公告)日：2020-12-03

申请号：US16970685

申请日：2019-02-19

Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.

Inventor： Saori KUBARA ,  Suguru TAKASAKI ,  Shuhei TOYOKAWA

IPC: G02B6/02 ,  G02B6/245 ,  G02B6/255 ,  C03C25/1065

Abstract: A method for manufacturing an optical fiber includes: exposing a glass fiber by stripping a fiber coating layer at an end portion, on a splicing side, of each of a pair of optical fibers; fusion-splicing the glass fibers; and recoating a protective resin on a periphery of exposed portions of the glass fibers. The fiber coating layer includes a primary resin layer on an inner peripheral side and having a Young's modulus of 0.5 MPa or less and a secondary resin layer on an outer peripheral side and having a Young's modulus of 800 MPa or greater, the exposing includes forming a shape of a coating edge of the fiber coating layer which includes the primary resin layer and the secondary resin layer into a tapered shape which becomes narrower toward the end portion side, and the recoating includes coating the protective resin to include the coating edge.

公开(公告)号：US20250034024A1

公开(公告)日：2025-01-30

申请号：US18780966

申请日：2024-07-23

Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.

Inventor： Takahito ENDO ,  Manabu SHIOZAKI ,  Shuhei TOYOKAWA ,  Kazuhiro YONEZAWA ,  Yuuji IZUMI ,  Maoto NOZEKI

IPC: C03B37/014

Abstract: An embodiment of the present disclosure provides a method for manufacturing an optical fiber in which an optical fiber is manufactured using a drawing furnace including a carbon furnace tube. The method includes drawing the optical fiber while supplying gas having an oxygen concentration of 3 ppm or more and 20 ppm or less as a major component of inert gas into the furnace tube.

公开(公告)号：US20220033294A1

公开(公告)日：2022-02-03

申请号：US17275769

申请日：2019-09-13

Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.

Inventor： Masatoshi HAYAKAWA ,  Masumi ITO ,  Tatsuya KONISHI ,  Shuhei TOYOKAWA

IPC: C03B37/018

Abstract: A method for manufacturing a glass fine particle deposit includes: emitting a siloxane gas, a carrier gas, and a combustion gas from a burner; setting volume concentration of a supply volume amount of the siloxane gas per unit time with respect to the sum of the supply volume amount of the siloxane gas per unit time and a supply volume amount of the carrier gas per unit time (C1) to 10.6 volume %