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公开(公告)号：US20230042363A1
公开(公告)日：2023-02-09
申请号：US17795488
申请日：2021-02-16
Applicant: Fujikura Ltd.
Inventor： Kensuke Shima , Rintaro Kitahara
Abstract: An optical fiber connector includes: amplifying fibers in which an active element activated by excitation light is added to a core of each of the amplifying fibers. The amplifying fibers are connected together such that an absorption amount of excitation light per unit length increases with an increase of a distance from an incident end of the excitation light. A mode field diameter of laser light propagating through the core is same among the amplifying fibers.
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公开(公告)号：US20220146765A1
公开(公告)日：2022-05-12
申请号：US17427276
申请日：2019-12-09
Applicant: Fujikura Ltd.
Inventor： Kensuke Shima
IPC: G02B6/42
Abstract: A filter device includes: an optical fiber that allows light having a predetermined wavelength to propagate in multimode; a first higher-order mode filter that removes at least part of the light in any higher order mode than a predetermined mode in the light in the multimode propagating in the optical fiber; and a fiber Bragg grating that transmits the light having the predetermined wavelength and reflects light having a particular wavelength longer than the predetermined wavelength.
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公开(公告)号：US20210048582A1
公开(公告)日：2021-02-18
申请号：US16978444
申请日：2019-03-15
Applicant: FUJIKURA LTD.
Inventor： Keisuke Uchiyama , Masahiro Kashiwagi , Kensuke Shima
IPC: G02B6/255
Abstract: An optical device includes: a thermal conductor; a support that is separated from the thermal conductor and that has a coefficient of thermal expansion lower than a coefficient of thermal expansion of the thermal conductor; and an optical fiber that thermally contacts with the thermal conductor via a resin covering a jacket-removed section of the optical fiber and that is fixed to the support in each of two jacketed sections of the optical fiber, wherein the two jacketed sections are adjacent to the jacket-removed section.
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公开(公告)号：US20220362878A1
公开(公告)日：2022-11-17
申请号：US17627016
申请日：2020-05-27
Applicant: FUJIKURA LTD.
Inventor： Kensuke Shima
Abstract: An optical fiber includes: a center core; an inner ring layer, located outside of the center core in a radial direction, that has a refractive index lower than a refractive index of the center core; an outer core, located outside of the inner ring layer in the radial direction, that has a refractive index higher than the refractive index of the inner ring layer; and an outer ring layer, located outside of the outer core in the radial direction, that has a refractive index lower than the refractive index of the outer core. A relative refractive index difference ΔCF between the center core and the inner ring layer varies along a longitudinal direction such that the relative refractive index difference ΔCF at a location along the longitudinal direction is smaller than a relative refractive index difference ΔPF between the outer core and the outer ring layer.
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公开(公告)号：US20140205236A1
公开(公告)日：2014-07-24
申请号：US14221760
申请日：2014-03-21
Applicant: FUJIKURA LTD.
Inventor： Yoshikiyo Noguchi , Kensuke Shima
IPC: G02B6/32
CPC classification number: G02B6/32 , G02B6/2835 , H01S3/005 , H01S3/2383
Abstract: An optical fiber combiner 1 has: a plurality of input optical fibers 20; a plurality of divergence angle reducing members 50 which lights emitted from the respective input optical fibers 20 enter and which emits the lights from the input optical fibers 20 at divergence angles made lower than divergence angles upon entrance; a bridge fiber 30 which the lights emitted from the respective divergence angle reducing members 50 enter and which has a tapered portion 34 which has a portion in which the lights propagate and a diameter of which is gradually reduced apart from a divergence angle reducing member 50 side; and an output optical fiber 40 which a light emitted from a side of the bridge fiber 30 opposite to the divergence angle reducing member 50 side enters.
Abstract translation: 光纤组合器1具有：多个输入光纤20; 多个从各个输入光纤20发出的光进入的发散角减少部件50进入，并且从入射角度发射来自输入光纤20的光，发散角低于发散角; 从各发散角减小部件50射出的光进入的桥式光纤30，其具有锥形部34，锥形部34具有光传播的部分，其直径从发散角减小部件50侧逐渐减小 ; 以及输出光纤40，其从与发散角减小部件50侧相反的一侧的光纤射出的光进入。
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Patent Agency Ranking
公开(公告)号：US11901690B2
公开(公告)日：2024-02-13
申请号：US17416873
申请日：2020-02-21
Applicant: Fujikura Ltd.
Inventor： Yasuo Nakanishi , Yasuhiro Mashiko , Shinichi Sakamoto , Kensuke Shima
CPC classification number: H01S3/0675 , H01S3/0078 , H01S3/06716 , H01S3/1618
Abstract: A fiber laser device includes a pumping light source, an amplifying fiber, an input side fiber fusion-spliced on an input side of the amplifying fiber and formed with a HR-FBG, an output side fiber fusion-spliced on an output side of the amplifying fiber and formed with an OC-FBG having a reflectivity smaller than that of the HR-FBG, an output end, and a mode filter, wherein the input side fiber or an intermediate fiber disposed between the amplifying fiber and the input side fiber is fusion-spliced with the amplifying fiber via a fusion splice portion, and at least a portion of the mode filter is disposed in a region between the fusion splice portion and a position separated from the fusion splice portion by a coherence length of beating caused by mode interference of signal light propagating in the amplifying fiber.
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公开(公告)号：US11835776B2
公开(公告)日：2023-12-05
申请号：US17427276
申请日：2019-12-09
Applicant: Fujikura Ltd.
Inventor： Kensuke Shima
IPC: G02B6/42 , H01S3/094 , H01S3/0941
CPC classification number: G02B6/4215 , H01S3/09415 , H01S3/094003
Abstract: A filter device includes: an optical fiber that allows light having a predetermined wavelength to propagate in multimode; a first higher-order mode filter that removes at least part of the light in any higher order mode than a predetermined mode in the light in the multimode propagating in the optical fiber; and a fiber Bragg grating that transmits the light having the predetermined wavelength and reflects light having a particular wavelength longer than the predetermined wavelength.
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公开(公告)号：US20220140563A1
公开(公告)日：2022-05-05
申请号：US17431031
申请日：2020-02-20
Applicant: Fujikura Ltd.
Inventor： Tomoki Funatsu , Kenichi Ohmori , Kensuke Shima
Abstract: An optical device includes a core, a first cladding, a second cladding, a slanted fiber Bragg grating, and a high refractive index material. The first cladding covers the core and has a lower refractive index than the core. The second cladding covers the first cladding and has a lower refractive index than the first cladding. The slanted fiber Bragg grating is formed in the core and couples stimulated Raman scattering light, propagating through the core, to the first cladding. The high refractive index material has a higher refractive index than the second cladding and covers an outer peripheral surface of a removal portion where the second cladding is removed and a portion of the first cladding that covers the region where the slanted fiber Bragg grating is formed in the core.
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公开(公告)号：US20220085565A1
公开(公告)日：2022-03-17
申请号：US17416873
申请日：2020-02-21
Applicant: Fujikura Ltd.
Inventor： Yasuo Nakanishi , Yasuhiro Mashiko , Shinichi Sakamoto , Kensuke Shima
Abstract: A fiber laser device includes a pumping light source, an amplifying fiber, an input side fiber fusion-spliced on an input side of the amplifying fiber and formed with a HR-FBG, an output side fiber fusion-spliced on an output side of the amplifying fiber and formed with an OC-FBG having a reflectivity smaller than that of the HR-FBG, an output end, and a mode filter, wherein the input side fiber or an intermediate fiber disposed between the amplifying fiber and the input side fiber is fusion-spliced with the amplifying fiber via a fusion splice portion, and at least a portion of the mode filter is disposed in a region between the fusion splice portion and a position separated from the fusion splice portion by a coherence length of beating caused by mode interference of signal light propagating in the amplifying fiber.
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公开(公告)号：US08983249B2
公开(公告)日：2015-03-17
申请号：US14221760
申请日：2014-03-21
Applicant: Fujikura Ltd.
Inventor： Yoshikiyo Noguchi , Kensuke Shima
CPC classification number: G02B6/32 , G02B6/2835 , H01S3/005 , H01S3/2383
Abstract: An optical fiber combiner 1 has: a plurality of input optical fibers 20; a plurality of divergence angle reducing members 50 which lights emitted from the respective input optical fibers 20 enter and which emits the lights from the input optical fibers 20 at divergence angles made lower than divergence angles upon entrance; a bridge fiber 30 which the lights emitted from the respective divergence angle reducing members 50 enter and which has a tapered portion 34 which has a portion in which the lights propagate and a diameter of which is gradually reduced apart from a divergence angle reducing member 50 side; and an output optical fiber 40 which a light emitted from a side of the bridge fiber 30 opposite to the divergence angle reducing member 50 side enters.
Abstract translation: 光纤组合器1具有：多个输入光纤20; 多个从各个输入光纤20发出的光进入的发散角减少部件50进入，并且从入射角度发射来自输入光纤20的光，发散角低于发散角; 从各发散角减小部件50射出的光进入的桥式光纤30，其具有锥形部34，锥形部34具有光传播的部分，其直径从发散角减小部件50侧逐渐减小 ; 以及输出光纤40，其从与发散角减小部件50侧相反的一侧的光纤射出的光进入。
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