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公开(公告)号：US20160187577A1
公开(公告)日：2016-06-30
申请号：US15062582
申请日：2016-03-07
Inventor： Yusuke Sasaki , Hitoshi Uemura , Katsuhiro Takenaga , Kunimasa Saitoh
CPC classification number: G02B6/02042 , G02B6/0288 , G02B6/14 , G02B6/268 , G02B6/287 , G02B2006/2839
Abstract: A multicore fiber 1 includes: a small diameter portion 33 in which a propagation constant of light of an x1-th order LP mode of the first core 11 (here, x1 is an integer of “2” or more and x or less, x is an integer of “2” or more) and a propagation constant of light of a y1-th order LP mode of the second core 12 (here, y1 is an integer of “1” or more and y or less other than x1, y is an integer of “1” or more) coincide with each other and a large diameter portion in which a propagation constant of light of each LP mode of the first core 11 and a propagation constant of light of each LP mode of the second core 12 are configured not to coincide with each other are arranged.
Abstract translation: 多芯光纤1包括：小直径部33，其中第一芯11的x1阶LP模的光的传播常数（这里，x1是“2”以上的整数，x以下的x，x 是“2”以上的整数），第2芯12的y1级LP模式的光的传播常数（这里，y1为除x1以外的y以下的整数，y为1以上的整数， y是“1”以上的整数）彼此一致，并且大直径部分，其中第一芯11的每个LP模式的光的传播常数和第二芯的每个LP模式的光的传播常数 12被配置为不相互重合。
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公开(公告)号：US08971685B2
公开(公告)日：2015-03-03
申请号：US13875851
申请日：2013-05-02
Inventor： Shoichiro Matsuo , Katsuhiro Takenaga , Kunimasa Saitoh , Masanori Koshiba
CPC classification number: G02B6/02042 , G02B6/0365
Abstract: A multicore fiber includes a plurality of core elements; and a clad surrounding an outer periphery surface of each of the core elements, and each of the core elements includes a core, a first clad surrounding the outer periphery surface of the core and a second clad surrounding an outer periphery surface of the first clad, and when a refractive index of the core is n1, a refractive index of the first clad is n2, a refractive index of the second clad is n3 and a refractive index of the clad is n4, all of n1>n2>n3, n1>n4 and n3
Abstract translation: 多芯光纤包括多个核心元件; 以及围绕每个芯体的外周面的包层，并且每个芯元件包括芯，围绕芯的外周表面的第一包层和围绕第一包层的外周表面的第二包层， 并且当芯的折射率为n1时，第一包层的折射率为n2，第二包层的折射率为n3，包层的折射率为n4，全部为n1> n2> n3，n1> n4和n3
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公开(公告)号：US20230036200A1
公开(公告)日：2023-02-02
申请号：US17788848
申请日：2020-12-16
Applicant: Fujikura Ltd.
Inventor： Katsuhiro Takenaga , Yusuke Sasaki , Masaki Ohzeki
Abstract: A multicore fiber includes: a cladding; a center core at a center of the cladding; and seven or more outer cores disposed at rotationally asymmetric positions on a circumference centered at the center of the cladding. Angles formed by adjacent ones of lines connecting the center core and respective ones of the outer cores are all 60° or less.
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公开(公告)号：US20230017442A1
公开(公告)日：2023-01-19
申请号：US17757960
申请日：2020-12-16
Applicant: Fujikura Ltd.
Inventor： Katsuhiro Takenaga , Yusuke Sasaki , Masaki Ohzeki
IPC: G02B6/02
Abstract: A multicore fiber includes: a cladding; and three or more and five or less cores disposed at rotationally asymmetric positions on a circumference centered at a center of the cladding. No core is disposed at the center of the cladding. Angles formed by adjacent ones of lines connecting the center of the cladding and respective ones of the cores are all larger than 60°.
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公开(公告)号：US10444113B2
公开(公告)日：2019-10-15
申请号：US15755345
申请日：2017-01-26
Applicant: FUJIKURA LTD.
Inventor： Shota Saito , Katsuhiro Takenaga
Abstract: A method of measuring crosstalk of a multicore fiber, the method including capturing an emitted light pattern at an end portion of a dummy fiber and obtaining a correlation data between a power of the light incident on the dummy fiber and the emitted light pattern, irradiating one core of the multicore fiber with a light through the dummy fiber, and measuring a power of a reference light emitted from the core, capturing a crosstalk light emitted from a different core different from the core on which the light is incident under a state where the reference light is masked, and estimating a power of the crosstalk light from a captured data of the crosstalk light and the correlation data, and calculating the crosstalk from the power of the reference light and the power of the crosstalk light.
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Patent Agency Ranking
公开(公告)号：US10310176B2
公开(公告)日：2019-06-04
申请号：US15571530
申请日：2016-05-20
Inventor： Yusuke Sasaki , Katsuhiro Takenaga , Kunimasa Saitoh
Abstract: A multi-core fiber performs communication using light up to an xth-order LP mode (where x is an integer of 1 or more) in a communication band. The multi-core fiber includes: a plurality of signal light propagation cores that propagate light up to an (x+1)th-order LP mode; and at least one high-loss core that has a higher loss of propagated light than the signal light propagation cores. Crosstalk occurs between light of the (x+1)th-order LP mode propagated through at least one signal light propagation core and light of a primary LP mode propagated through at least one high-loss core.
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公开(公告)号：US20190049658A1
公开(公告)日：2019-02-14
申请号：US16076610
申请日：2016-12-05
Applicant: FUJIKURA LTD.
Inventor： Shota Saito , Katsuhiro Takenaga
Abstract: An optical fiber that communicates in a predetermined communication band includes: a signal light propagation core that propagates light beams of up to (x+1)-th order LP mode, where x is an integer of two or more; and a coupler that propagates a light beam that is: coupled with a light beam of the (x+1)-th order LP mode propagating through the signal light propagation core, and suppressed from being coupled with light beams of up to the x-th order LP mode propagating through the signal light propagation core, wherein, mode coupling of the light beams of up to the x-th order LP mode propagating through the signal light propagation core is performed, and mode coupling between the light beam of the x-th order LP mode and the light beam of (x+1)-th order LP mode is suppressed.
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公开(公告)号：US20190033512A1
公开(公告)日：2019-01-31
申请号：US16070886
申请日：2016-02-25
Applicant: Fujikura Ltd.
Inventor： Hitoshi Uemura , Katsuhiro Takenaga
Abstract: An optical device includes a plurality of cores and a clad that surrounds outer circumferential surfaces of the cores and has a lower refractive index than the cores. Each of the cores has a large diameter portion, a tapered portion, and a reduced diameter portion formed along a longitudinal direction and has a refractive index gradually increasing from outer circumference to a center. In each of the cores, a radial-direction distance r (μm) from the center, a refractive index n(r) at the distance r, a relative refractive index difference Δ[%] of the center with respect to the clad, a radius r0 [μm], and a constant α satisfy predetermined formulas and a wavelength λ [nm] of light propagating through the cores and a diameter R of each core before the diameter reduction with respect to a diameter of each core after the diameter reduction satisfy predetermined formulas.
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公开(公告)号：US10156674B2
公开(公告)日：2018-12-18
申请号：US15142246
申请日：2016-04-29
Inventor： Katsuhiro Takenaga , Shoichiro Matsuo , Yusuke Sasaki , Kunimasa Saitoh
Abstract: A multicore fiber for communication 10 which allows propagation of an optical signal includes: a clad 12; a core 11a which is arranged in a center of the clad 12; and seven to ten cores 11b which are arranged at equal intervals surrounding the core 11a, and the cladding diameter is 230 μm, distances between centers of the mutually neighboring cores 11a and 11b are 30 μm or more, distances between the centers of the cores 11b and an outer peripheral surface of the clad 12 are 35 μm or more and a mode field diameter of light propagating in the cores 11a and 11b is 9 μm to 13 μm.
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公开(公告)号：US09698557B2
公开(公告)日：2017-07-04
申请号：US15062681
申请日：2016-03-07
Applicant: FUJIKURA LTD. , NIPPON TELEGRAPH AND TELEPHONE CORPORATION , OSAKA PREFECTURE UNIVERSITY PUBLIC CORPORATION
Inventor： Tsukasa Hosokawa , Kentaro Ichii , Katsuhiro Takenaga , Shoichiro Matsuo , Hirotaka Ono , Makoto Yamada
CPC classification number: H01S3/06729 , G02B6/03611 , H01S3/06766 , H01S3/0804 , H01S3/094003 , H01S3/094069 , H01S3/09415 , H01S3/1608
Abstract: An optical fiber for amplification includes a core having an inner core and an outer core surrounding the outer circumferential surface of the inner core. The relative refractive index difference of the inner core to a cladding is smaller than the relative refractive index difference of the outer core to the cladding. The outer core is entirely doped with erbium. The theoretical cutoff wavelength of an LP11 mode light beam is a wavelength of 1,565 nm or more. The theoretical cutoff wavelength of an LP21 mode light beam is a wavelength of 1,530 nm or less. The theoretical cutoff wavelength of the LP02 mode light beam is a wavelength of 980 nm or less.
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