公开(公告)号：US20230358949A1

公开(公告)日：2023-11-09

申请号：US18353376

申请日：2023-07-17

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Kazunori MUKASA ,  Minoru KASAHARA ,  Keiichi AISO ,  Yukihiro TSUCHIDA ,  Naoya YOMOGITA ,  Takumi SUGANE ,  Ichihiko SUGANUMA ,  Tomoaki GONOHE ,  Mitsuhiro IWAYA ,  Zoltan VARALLYAY ,  Tamas MIHALFFY

IPC: G02B6/02 ,  G02B6/036

CPC classification number: G02B6/02395 ,  G02B6/02019 ,  G02B6/03627

Abstract: An optical fiber includes: a core portion made of glass; a side core layer made of glass and enclosing the core portion; a cladding portion made of glass and enclosing the side core layer; and a coating layer including a primary layer made of resin and enclosing the cladding portion, and a secondary layer made of resin and enclosing the primary layer. The relationships Δ1>ΔClad>Δ2 and 0>Δ2 are satisfied where Δ1 represents relative refractive-index difference of average maximum refractive index of the core portion with respect to average refractive index of the cladding portion, Δ2 represents relative refractive-index difference of average refractive index of the side core layer with respect to average refractive index of the cladding portion, and ΔClad represents relative refractive-index difference of average refractive index of the cladding portion with respect to refractive index of pure silica glass.