公开(公告)号：US20160172818A1

公开(公告)日：2016-06-16

申请号：US15052315

申请日：2016-02-24

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Shigehiro TAKASAKA

IPC: H01S3/108 ,  H01S3/067 ,  H01S3/094 ,  H01S3/10 ,  G02B6/036 ,  H01S3/102 ,  G02B6/27 ,  H04J14/02 ,  G02B6/028

CPC classification number: H01S3/1083 ,  G02B6/02247 ,  G02B6/0283 ,  G02B6/0365 ,  G02B6/2773 ,  H01S3/06725 ,  H01S3/06729 ,  H01S3/06754 ,  H01S3/094042 ,  H01S3/1003 ,  H01S3/1028 ,  H01S3/2375 ,  H01S2301/02 ,  H01S2301/04 ,  H04B10/294 ,  H04J14/0221

Abstract: An optical amplifier includes: an optical amplifying fiber; and a pump light source that supplies pump light to the optical amplifying fiber, the pump light being used for parametrically amplifying signal light input to the optical amplifying fiber by using a non-linear optical effect of the optical amplifying fiber. The fluctuation of the zero-dispersion wavelength of the optical amplifying fiber in the longitudinal direction is within the limit of 0.5 nm/100 m.

Abstract translation: 光放大器包括：光放大光纤; 以及泵浦光源，其向所述光放大光纤提供泵浦光，所述泵浦光用于通过使用所述光放大光纤的非线性光学效应来参数地放大输入到所述光放大光纤的信号光。 光放大光纤在长度方向的零色散波长的波动在0.5nm /100μm的范围内。

公开(公告)号：US20140043674A1

公开(公告)日：2014-02-13

申请号：US14018225

申请日：2013-09-04

Applicant: Furukawa Electric Co., Ltd.

Inventor： Shigehiro TAKASAKA ,  Yu Mimura

IPC: H01S3/10

CPC classification number: H01S3/10023 ,  G02F1/395 ,  G02F2201/04 ,  G02F2201/307 ,  G02F2203/50 ,  G02F2203/585 ,  H01S3/06725 ,  H01S3/06754 ,  H01S3/302 ,  H01S2301/04 ,  H04B10/294

Abstract: An optical amplifier includes an optical gain fiber into which signal light and pump light are input and at least one relative phase shifter is inserted. Preferably, the relative phase shifter is inserted so that the relative phase in the lengthwise direction of the optical gain fiber falls within a predetermined range containing 0.5 Π. Preferably, the optical gain fiber is a highly non-linear optical fiber having a non-linearity constant of at least 10/W/km. Preferably, the dispersion of the optical gain fiber is within the range from −1 ps/nm/km to 1 ps/nm/km in an amplification band. Preferably, the absolute value of the dispersion slope of the optical gain fiber at a zero dispersion wavelength is no greater than 0.05 ps/nm2/km.

Abstract translation: 光放大器包括一个光增益光纤，信号光和泵浦光被输入到该增益光纤中，至少有一个相对移相器被插入。 优选地，插入相对移相器，使得光增益光纤的长度方向上的相对相位落在包含0.5Pi的预定范围内。 优选地，光增益光纤是具有至少10 / W / km的非线性常数的高度非线性的光纤。 优选地，光增益光纤的色散在放大频带内在-1ps / nm / km至1ps / nm / km的范围内。 优选地，在零色散波长处的光学增益光纤的色散斜率的绝对值不大于0.05ps / nm2 / km。

公开(公告)号：US20240332884A1

公开(公告)日：2024-10-03

申请号：US18732956

申请日：2024-06-04

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Haruki OGOSHI ,  Junji YOSHIDA ,  Yusuke INABA ,  Tatsuya KIMOTO ,  Masaki FUNABASHI ,  Seiji ICHINO ,  Naoya HOJO ,  Shigehiro TAKASAKA ,  Ryuichi SUGIZAKI ,  Nitidet THUDSALINGKARNSAKUL ,  Sanguan ANANTATHANASARN

IPC: H01S3/10 ,  H01S3/067 ,  H01S3/0933 ,  H01S3/30

CPC classification number: H01S3/10084 ,  H01S3/06754 ,  H01S3/0933 ,  H01S3/302 ,  H01S2301/02

Abstract: A light source includes: a seed light source configured to output incoherent seed light having a predetermined bandwidth; and a booster amplifier that is a semiconductor optical amplifier configured to optically amplify the seed light entered through a first end facet and output the amplified light through a second end facet. The booster amplifier has nL being set, which is a product of a refractive index n and a chip length L, so as to simultaneously suppress relative intensity noise (RIN) and ripple in the amplified light.

公开(公告)号：US20230231629A1

公开(公告)日：2023-07-20

申请号：US18180512

申请日：2023-03-08

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Haruki OGOSHI ,  Junji YOSHIDA ,  Yusuke INABA ,  Tatsuya KIMOTO ,  Masaki FUNABASHI ,  Seiji ICHINO ,  Naoya HOJO ,  Shigehiro TAKASAKA ,  Ryuichi SUGIZAKI ,  Nitidet THUDSALINGKARNSAKUL ,  Sanguan ANANTATHANASARN

IPC: H04B10/291 ,  H01S5/50

CPC classification number: H04B10/2916 ,  H01S5/5027 ,  H04B10/25

Abstract: A light source includes: a seed light source configured to output incoherent seed light with a predetermined bandwidth; and a booster amplifier that is a semiconductor optical amplifier configured to optically amplify the seed light input from a first facet, and output the amplified seed light as amplified light from a second facet, wherein the first facet and the second facet of the booster amplifier are subjected to a reflection reduction treatment, the booster amplifier is configured to operate in a gain saturated state, and relative intensity noise (RIN) and ripple are simultaneously suppressed in the amplified light.

公开(公告)号：US20230003934A1

公开(公告)日：2023-01-05

申请号：US17931732

申请日：2022-09-13

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Shigehiro TAKASAKA ,  Koichi MAEDA ,  Ryuichi SUGIZAKI

IPC: G02B6/02 ,  G02B6/036 ,  G02B6/04 ,  H01S3/094

Abstract: A multi-core optical amplifying fiber includes: core portions doped with a rare-earth element; an inner cladding portion; and an outer cladding portion. A mode field diameter of each core portion at a wavelength at which the rare-earth element performs optical amplification is 5 μm to 11 μm, a relative refractive-index difference of the maximum refractive index of each core portion with respect to the inner cladding portion is 0.35% to 2%, a core-to-core distance is set such that total inter-core crosstalk is −40 dB/100 m or lower in an optical amplification wavelength band subjected to the optical amplification, a cladding thickness is smaller than a value obtained by adding the mode field diameter to a minimum value of the core-to-core distance, and a ratio of a total sectional area of the core portions to a sectional area of the inner cladding portion is 1.9% or more.

公开(公告)号：US20220003924A1

公开(公告)日：2022-01-06

申请号：US17479343

申请日：2021-09-20

Applicant: FURUKAWA ELECTRIC CO., LTD.

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

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

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：US20200301066A1

公开(公告)日：2020-09-24

申请号：US16893589

申请日：2020-06-05

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Shigehiro TAKASAKA ,  Koichi MAEDA

IPC: G02B6/028 ,  G02B6/02 ,  G02B6/42

Abstract: An aim is to provide an optical coupler that contributes increasing pump-efficiency in an optical amplifier, and the optical amplifier. The optical amplifier includes: a main optical fiber that includes a core transmitting signal light, an inner cladding portion formed around an outer periphery of the core and having a refractive index lower than a refractive index of the core, and an outer cladding portion formed around an outer periphery of the inner cladding portion and having a refractive index lower than the refractive index of the inner cladding portion, a part of the outer cladding portion of which in a longitudinal direction being removed; and at least one pump-light input-output optical fiber that is fusion-spliced to the inner cladding portion of the main optical fiber at the portion where the outer cladding portion is removed, an average refractive index of which in a contact region where the pump-light input-output optical fiber is in contact with the inner cladding portion being larger than the refractive index of the inner cladding portion. Pump-light propagating in the pump-light input-output optical fiber is coupled to the inner cladding portion from the contact region and propagates in the inner cladding portion, or the pump-light propagating in the inner cladding portion is coupled to the pump-light input-output optical fiber from the contact region and propagates in the pump-light input-output optical fiber.

公开(公告)号：US20160118762A1

公开(公告)日：2016-04-28

申请号：US14976922

申请日：2015-12-21

Applicant: FURUKAWA ELECTRIC CO., LTD.

Inventor： Masateru TADAKUMA ,  Koichi MAEDA ,  Yukihiro TSUCHIDA ,  Shigehiro TAKASAKA ,  Ryuichi SUGIZAKI

IPC: H01S3/067 ,  H01S3/094

CPC classification number: H01S3/06737 ,  G02B6/02042 ,  H01S3/06758 ,  H01S3/06766 ,  H01S3/06783 ,  H01S3/094003 ,  H01S3/094007 ,  H01S3/094019 ,  H01S3/094038 ,  H01S3/094061 ,  H01S3/10023 ,  H01S3/1608 ,  H01S2301/04

Abstract: A multi-core optical amplifying fiber device includes a plurality of multi-core optical amplifying fibers including a plurality of core portions doped with amplification medium and a cladding portion formed at outer peripheries of the plurality of core portions; and a connection portion connecting the core portions of the plurality of multi-core optical amplifying fibers to one another. The connection portion connects the core portions to restrain deviation, between every connected core portions, of amplification gain for a total length of the core portions connected one another.

Abstract translation: 多芯光放大光纤装置包括多个多芯光放大光纤，包括多个掺杂有放大介质的芯部和形成在多个芯部的外周的包层部分; 以及将多个多芯光放大光纤的芯部彼此连接的连接部。 连接部分连接核心部分以限制每个连接的芯部分之间的彼此连接的芯部分的总长度的放大增益之间的偏差。