公开(公告)号：US20230212057A1

公开(公告)日：2023-07-06

申请号：US18183385

申请日：2023-03-14

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Kazunori MUKASA ,  Zoltan VARALLYAY ,  Bence NEMETH ,  Bela CSENGERI ,  Zsolt PUSKAS ,  Peter SZELESTEY ,  Gabor VARGA

IPC: C03B37/027 ,  C03C25/106 ,  G02B6/02

CPC classification number: C03B37/02772 ,  C03C25/106 ,  G02B6/02395 ,  C03B2205/47 ,  C03B2205/10 ,  C03B2205/62 ,  C03B2201/12 ,  C03B2201/50 ,  C03B2201/31

Abstract: An optical fiber manufacturing method includes: a drawing step of heating one end portion of an optical fiber preform to melt and deform the one end portion and drawing an optical fiber, wherein in the drawing step, drawing is performed while applying pressure to a melted-deformed portion that is melted and deformed.

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.

公开(公告)号：US20220179150A1

公开(公告)日：2022-06-09

申请号：US17651979

申请日：2022-02-22

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Kazunori MUKASA ,  Tamas MIHALFFY ,  Zoltan VARALLYAY

IPC: G02B6/02 ,  C03C25/1065

Abstract: An optical fiber includes: a core made of silica based glass; a cladding made of silica based glass, the cladding having a refractive index that is lower than a maximum refractive index of the core; and a coating including a primary coating layer, and a secondary coating layer. An outer diameter of the cladding is less than 100 μm. A thickness of the primary coating layer is larger than or equal to 15 μm. A mode field diameter at a wavelength of 1310 nm is larger than or equal to 8.6 μm and smaller than or equal to 9.2 μm. An effective cutoff wavelength is smaller than or equal to 1260 μm. A bending loss at a wavelength of 1550 nm when bending is made at a diameter of 60 mm is smaller than or equal to 0.1 dB/100 turn.

公开(公告)号：US20220082753A1

公开(公告)日：2022-03-17

申请号：US17456601

申请日：2021-11-26

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Kazunori MUKASA ,  Tamas MIHALFFY ,  Zoltan VARALLYAY

IPC: G02B6/02

Abstract: An optical fiber includes: a core made of silica-based glass; a cladding configured to cover an outer circumference of the core and made of silica-based glass having a refractive index smaller than a maximum refractive index of the core; and a coating configured to cover an outer circumference of the cladding. The cladding has an outer diameter of 120 μm or smaller, a mode field diameter at a wavelength of 1310 nm is 8.6 μm to 9.2 μm, an effective cut-off wavelength is 1260 μm or smaller, and a bending loss at a wavelength of 1550 nm in a case of bending at a diameter of 20 mm is 0.75 dB/turn or smaller.