公开(公告)号：US20240151898A1

公开(公告)日：2024-05-09

申请号：US18410522

申请日：2024-01-11

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Kohei KAWASAKI ,  Ryuichi SUGIZAKI ,  Masayoshi TSUKAMOTO ,  Masanori TAKAHASHI ,  Shigehiro TAKASAKA ,  Koichi MAEDA

IPC: G02B6/04 ,  C03C25/106 ,  C03C25/26 ,  G02B6/40

CPC classification number: G02B6/04 ,  C03C25/106 ,  C03C25/26 ,  G02B6/403

Abstract: An optical fiber bundle structure includes: plural optical fiber core wires; a crossing preventing member; and a grasping member. Further, the crossing preventing member has slits and the widths of the slits positioned at the respective sides are each equal to or larger than a difference between: a length of one side of a polygon circumscribing the plural optical fiber core wires at a hindmost end portion of the slits at the trailing end; and a length of one side of a polygon circumscribing the plural optical fiber core wires at the leading end.

公开(公告)号：US20230038133A1

公开(公告)日：2023-02-09

申请号：US17955982

申请日：2022-09-29

Applicant: FURUKAWA ELECTRIC CO., LTD. ,  KDDI CORPORATION

Inventor： Shigehiro TAKASAKA ,  Koichi MAEDA ,  Ryuichi SUGIZAKI ,  Takehiro TSURITANI ,  Hidenori TAKAHASHI ,  Itsuro MORITA

IPC: H01S3/23 ,  H01S3/091 ,  H01S3/067 ,  H01S3/16

Abstract: An optical fiber amplification. system includes: a first optical fiber amplifier including a first optical amplifying fiber including a core portion doped with a first rare-earth. element, a first input unit configured to receive first signal light, an excitation-light source configured to output pump light, a pump light combiner configured to input the pump light to the first optical amplifying fiber, and a residual pump light recovery device configured to recover residual pump light; and a second optical fiber amplifier including a second optical amplifying fiber including a core portion doped with a second rare-earth. element, a second input unit configured to receive second signal light, and a residual pump light combiner configured to input, to the second optical amplifying fiber, the residual pump light recovered by the residual pump light recovery device.

公开(公告)号：US20210116265A1

公开(公告)日：2021-04-22

申请号：US17136446

申请日：2020-12-29

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Masateru TADAKUMA ,  Shigehiro TAKASAKA ,  Ryuichi SUGIZAKI

IPC: G01D5/353 ,  G02B6/02 ,  G01B11/16

Abstract: A cable comprising: a plurality of optical fiber cores; and one or more optical fiber core wires including one or more of the optical fiber cores. Further, at least one of the optical fiber core wire is fixed at a plurality of positions in a longitudinal direction of the cable so as to achieve substantially no displacement in a cable radial direction, at least a pair of the optical fiber core wires are fixed in a plane perpendicular to the longitudinal direction of the cable so as to achieve substantially no displacement relative to each other, and sensing of a strain profile in the longitudinal direction of at least the pair of the optical fiber core wires leads to achievement of sensing of a shape of the cable in the longitudinal direction.

公开(公告)号：US20250023316A1

公开(公告)日：2025-01-16

申请号：US18898807

申请日：2024-09-27

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Haruki OGOSHI ,  Junji YOSHIDA ,  Yusuke INABA ,  Seiji ICHINO ,  Yasuto TATAMIDA ,  Shigehiro TAKASAKA ,  Ryuichi SUGIZAKI ,  Nitidet THUDSALINGKARNSAKUL ,  Sanguan ANANTATHANASARN ,  Supadda PHOKEAW

IPC: H01S3/067 ,  H01S3/0915 ,  H01S3/30

Abstract: A Raman amplifier includes: a Raman amplification optical fiber configured to Raman amplify incoherent light in which relative intensity noise (RIN) is suppressed while transmitting the incoherent light; and a pumping light source configured to supply pumping light to the Raman amplification optical fiber. A corner frequency fc [Hz] at which the suppression of the RIN starts in the Raman-amplified incoherent light is estimated by using the following Equation (1): fc = 1 / ( D · Δλ · L ) ( 1 ) in which a full width at half maximum of a wavelength spectrum of the incoherent light is Δλ [nm], a length of the Raman amplification optical fiber is L [km], and a chromatic dispersion of the Raman amplification optical fiber at a center wavelength of the incoherent light is D [ps/nm/km].

公开(公告)号：US20230314700A1

公开(公告)日：2023-10-05

申请号：US18332177

申请日：2023-06-09

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Kengo WATANABE ,  Masanori TAKAHASHI ,  Ryuichi SUGIZAKI ,  Koichi MAEDA ,  Shigehiro TAKASAKA

IPC: G02B6/04 ,  C03B37/028

CPC classification number: G02B6/04 ,  C03B37/028

Abstract: An optical fiber bundle structure includes: a plurality of optical fiber core wires; and a capillary, wherein each of the optical fiber core wires includes a glass fiber portion including a core and a clad, and a resin coated portion, the glass fiber portions are inserted in the capillary, and d2/d1 is equal to or larger than 0.57 and smaller than 1, where d1 is a diameter of the core of each of the glass fiber portions in a rear end portion of the capillary and d2 is a diameter of the core of each of the glass fiber portions in a distal end portion of the capillary.

公开(公告)号：US20230006410A1

公开(公告)日：2023-01-05

申请号：US17931264

申请日：2022-09-12

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Shigehiro TAKASAKA ,  Koichi MAEDA ,  Keiichi AISO ,  Shinichi ARAI ,  Ryuichi SUGIZAKI ,  Kazunori MUKASA ,  Yukihiro TSUCHIDA ,  Masanori TAKAHASHI

IPC: H01S3/067 ,  H01S3/16 ,  H01S3/091

Abstract: An optical amplifying fiber includes: at least one single core portion doped with a rare-earth element; an inner cladding portion configured to enclose the at least one core portion, the inner cladding portion having a lower refractive index than maximum refractive index of each core portion; and an outer cladding portion configured to enclose the inner cladding portion, the outer cladding portion having a lower refractive index than refractive index of the inner cladding portion, wherein the inner cladding portion includes a plurality of air bubbles.

公开(公告)号：US20210186612A1

公开(公告)日：2021-06-24

申请号：US17195844

申请日：2021-03-09

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Kengo WATANABE ,  Shunichi MATSUSHITA ,  Yoshiki NOMURA ,  Shigehiro TAKASAKA ,  Masaki IWAMA

IPC: A61B18/22 ,  G02B6/34 ,  G02B6/26

Abstract: To provide an optical probe capable of changing a traveling direction of an output beam to a sideward direction. The optical probe includes an optical fiber that outputs a beam from a distal end thereof, and a traveling direction changing unit that changes a traveling direction of the output beam to a sideward direction with respect to the optical fiber. The optical probe includes a holder member that is mounted on a distal end side of the optical fiber and holds the optical fiber, and the traveling direction changing unit may be a reflector that is arranged on the holder member and that reflects output beam.

公开(公告)号：US20240142697A1

公开(公告)日：2024-05-02

申请号：US18410605

申请日：2024-01-11

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Kohei KAWASAKI ,  Ryuichi SUGIZAKI ,  Masayoshi TSUKAMOTO ,  Masanori TAKAHASHI ,  Shigehiro TAKASAKA ,  Koichi MAEDA

IPC: G02B6/04 ,  C03C25/106 ,  C03C25/26 ,  G02B6/40

CPC classification number: G02B6/04 ,  C03C25/106 ,  C03C25/26 ,  G02B6/403

Abstract: An optical fiber bundle structure includes: plural optical fiber core wires; a crossing preventing member; and a grasping member. Further, the crossing preventing member has slits and the widths of the slits positioned at the respective sides are each equal to or larger than a difference between: a length of one side of a polygon circumscribing the plural optical fiber core wires at a hindmost end portion of the slits at the trailing end; and a length of one side of a polygon circumscribing the plural optical fiber core wires at the leading end.

公开(公告)号：US20240014622A1

公开(公告)日：2024-01-11

申请号：US18472597

申请日：2023-09-22

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Shigehiro TAKASAKA ,  Yoshihiro EMORI ,  Shinichi ARAI ,  Ryuichi SUGIZAKI

IPC: H01S3/067 ,  H01S3/094

CPC classification number: H01S3/06737 ,  H01S3/094003

Abstract: A laser device includes: a seed light source configured to output a laser light having a single mode; a multicore fiber including at least one core group having at least one core, each of the core in the core group being optically coupled to neighboring cores; and an optical coupler configured to input the laser light to the core group, wherein in the multicore fiber, the laser light propagates through the core group in a super mode representing propagation mode of the core group.

公开(公告)号：US20230123319A1

公开(公告)日：2023-04-20

申请号：US18068039

申请日：2022-12-19

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Shigehiro TAKASAKA ,  Koichi MAEDA ,  Keiichi AISO ,  Shinichi ARAI ,  Kazunori MUKASA ,  Yukihiro TSUCHIDA ,  Masanori TAKAHASHI ,  Ryuichi SUGIZAKI

IPC: H01S3/067 ,  H01S3/094

Abstract: An optical amplifying fiber includes: at least one core portion including a rare earth element added therein; an inner cladding portion surrounding the at least one core portion, the inner cladding portion having a refractive index lower than a maximum refractive index of the at least one core portion; and an outer cladding portion surrounding the inner cladding portion, the outer cladding portion having a refractive index lower than the refractive index of the inner cladding portion, the inner cladding portion including different refractive index regions each having a refractive index different from a refractive index of a region adjacent to that different refractive index region.