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公开(公告)号：US12092859B2
公开(公告)日：2024-09-17
申请号：US17757960
申请日：2020-12-16
Applicant: Fujikura Ltd.
Inventor： Katsuhiro Takenaga , Yusuke Sasaki , Masaki Ohzeki
CPC classification number: G02B6/02042 , G02B6/3885 , G02B6/3833 , G02B6/4433
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：US10663653B2
公开(公告)日：2020-05-26
申请号：US16174841
申请日：2018-10-30
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：US20190033513A1
公开(公告)日：2019-01-31
申请号：US16072786
申请日：2017-03-02
Applicant: FUJIKURA LTD. , NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITY , Technical University of Denmark
Inventor： Yusuke Sasaki , Katsuhiro Takenaga , Kunimasa Saitoh , Toshio Morioka
Abstract: A multicore fiber includes: a first core having a first propagation loss of a first light beam in a mode one order higher than a mode of a second light beam that transmits information. The first propagation loss is 0.02 dB/m or more and 1 dB/m or less, in a wavelength band of light beams including the second light beam that transmit the information when a bend having a diameter of 280 mm is applied to the multicore fiber.
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公开(公告)号：US20170248754A1
公开(公告)日：2017-08-31
申请号：US15424087
申请日：2017-02-03
Inventor： Yusuke Sasaki , Hitoshi Uemura , Kunimasa Saitoh , Takeshi Fujisawa
IPC: G02B6/02
CPC classification number: G02B6/02 , G02B6/02023 , G02B6/02042
Abstract: A multicore fiber includes: a center core that propagates four LP mode light beams including an LP02 mode light beam; and a first to a fifth cores disposed on a first line to a fifth line segments extend from the center of the center core in the radial direction at predetermined angles. The multicore fiber includes a different mode interaction section in which the propagation constants of each mode light beam propagated through the center core are matched with the propagation constants of LP01 mode light beams propagated through the first to fifth cores.
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公开(公告)号：US09588284B2
公开(公告)日：2017-03-07
申请号：US15062530
申请日：2016-03-07
Inventor： Yusuke Sasaki , Katsuhiro Takenaga , Yoshimichi Amma , Kunimasa Saitoh
CPC classification number: G02B6/02042 , G02B6/02219 , G02B6/028 , G02B6/0288 , G02B6/036
Abstract: In a C band and an L band, the effective refractive indices of light propagating through the cores 11 and 21 adjacent to each other are different from each other such that a magnitude of crosstalk of light of a highest-order LP mode commonly propagating through the cores 11 and 21 adjacent to each other between the cores 11 and 21 adjacent to each other becomes a peak at a bending diameter smaller than a diameter of 100 mm, and the core has a higher refractive index in a center portion than in an outer circumferential portion such that a differential mode group delay of the cores 11 and 12 is 700 picoseconds/km or less.
Abstract translation: 在C波段和L波段中，通过彼此相邻的芯11和21传播的光的有效折射率彼此不同，使得最高阶LP模式的光的串扰的大小通常传播通过 在彼此相邻的芯11和21之间彼此相邻的芯11和21在弯曲直径小于直径100mm的峰处，并且芯在中心部分具有比外周更高的折射率 使得芯11和12的差模组群延迟为700皮秒/ km或更小。
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Patent Agency Ranking
公开(公告)号：US09400351B2
公开(公告)日：2016-07-26
申请号：US14770570
申请日：2014-02-27
Inventor： Katsuhiro Takenage , Yusuke Sasaki , Shioichiro Matsuo , Kunimasa Saitoh
CPC classification number: G02B6/02042 , G02B6/03605
Abstract: A multi-core fiber (1) is a multi-core fiber including 10 or greater of even numbered cores and a cladding surrounding the core. In the even numbered cores, a half of cores (11a) are disposed in such a manner that centers are located on the apexes of a regular polygon (RP) whose center is at an origin point (O) in a cladding (20). In the even numbered cores, other cores (11b) are disposed in a manner that centers are located on perpendicular bisectors (LV) of the edges of a regular polygon on the inner side of the regular polygon (RP). The other cores (11b) are disposed in a specific range in the regular polygon (RP).
Abstract translation: 多芯光纤（1）是包括10个或更多个偶数芯的多芯光纤和围绕该芯的包层。 在偶数芯中，一半的芯（11a）以这样的方式设置，使得中心位于其中心处于包层（20）中的原点（O）的正多边形（RP）的顶点上。 在偶数芯中，其他芯（11b）以中心位于正多边形（RP）内侧上的正多边形的边缘的垂直二等分线（LV）上的方式设置。 其他芯（11b）设置在规则多边形（RP）中的特定范围内。
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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：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：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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