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公开(公告)号：US09199411B2
公开(公告)日：2015-12-01
申请号：US13782133
申请日：2013-03-01
Applicant: FUJIKURA LTD.
Inventor： Yoko Arakawa , Katsuhiro Takenaga , Shoichiro Matsuo
CPC classification number: B29C65/02 , G02B6/02042 , G02B6/2551
Abstract: A butting step S1 of butting end surfaces of multi-core fibers against each other by aligning central axes CA of clads 20 of the multi-core fibers to cause each core 11 of one multi-core fiber 1a and each core 11 of the other multi-core fiber 1b to face each other, and a fusing step S2 of fusing the multi-core fibers to each other by carrying out discharge by a pair of discharge electrodes 50a and 50b that sandwich a butted position of the multi-core fibers and face each other are provided. The fusing step S2 causes tips 51a and 51b of the discharge electrodes to perform reciprocating motion such that a straight line SL that connects the tips 51a and 51b of the discharge electrodes moves while describing a surface perpendicular to the central axes CA.
Abstract translation: 通过使多芯纤维的包层20的中心轴CA对齐，使得多芯纤维的端面对接，使多芯纤维的端面与多芯纤维1a的每个芯11和另一多芯纤维 芯纤维1b彼此面对;以及熔融步骤S2，通过由夹着多芯纤维的对接位置的一对放电电极50a和50b进行放电来使多芯光纤彼此熔合， 互相提供。 定影步骤S2使放电电极的尖端51a和51b进行往复运动，使得连接放电电极的尖端51a和51b的直线SL在描述与中心轴CA垂直的表面的同时移动。
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52.发明授权公开(公告)号：US09086519B2
公开(公告)日：2015-07-21
申请号：US14016706
申请日：2013-09-03
Applicant: FUJIKURA LTD.
Inventor： Yoko Arakawa , Katsuhiro Takenaga
CPC classification number: G02B6/02042 , G02B6/02395 , G02B6/0365 , G02B6/255 , G02B6/46 , Y10T29/49826
Abstract: A multi-core fiber includes a plurality of cores, a marker which is disposed to be parallel to the cores, and a clad which surrounds outer peripheral surfaces of the cores and the marker. The marker may propagate light having a wavelength which is the same as a wavelength of light which propagates in the core as single mode light.
Abstract translation: 多芯光纤包括多个芯，设置成与芯平行的标记，以及围绕芯和标记的外周表面的包层。 标记可以传播具有与在芯中传播的光的波长相同的波长的光作为单模光。
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公开(公告)号：US08965165B2
公开(公告)日：2015-02-24
申请号：US14013778
申请日：2013-08-29
Applicant: Fujikura Ltd.
Inventor： Yusuke Sasaki , Shoichiro Matsuo , Katsuhiro Takenaga
CPC classification number: G02B6/02042 , G02B6/02366 , G02B6/0365
Abstract: A multicore fiber includes a cladding and a plurality of core elements which is provided in the cladding and includes a core, an inner cladding layer that surrounds the core, and a low-refractive index layer that surrounds the inner cladding layer and has a lower average refractive index than the cladding and the inner cladding layer. The plurality of core elements is arranged such that a specific core element is surrounded by three or more core elements, and a low-refractive index layer of a partial core element of the plurality of core elements is configured to have larger light confinement loss in the core than low-refractive index layers of the other partial core elements.
Abstract translation: 多芯光纤包括包层和多个芯元件，其设置在包层中并且包括芯，围绕芯的内包层和围绕内包层并具有较低平均值的低折射率层 折射率比包层和内包层高。 多个芯元件被布置成使得特定的芯元件被三个或更多个芯元件包围，并且多个芯元件中的部分芯元件的低折射率层被配置为具有较大的光限制损耗 核心比其他部分核心元件的低折射率层。
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公开(公告)号：US20140010508A1
公开(公告)日：2014-01-09
申请号：US13936624
申请日：2013-07-08
Inventor： Shoichiro Matsuo , Katsuhiro Takenaga , Kunimasa Saitoh , Masanori Koshiba
IPC: G02B6/02
CPC classification number: G02B6/02042 , G02B6/03638 , G02B6/14 , G02B6/2552
Abstract: A radius of a first core 21 in a large-diameter end surface EF1 of a tapered portion 31 is denoted by r1S, a radius of a second core 22 is denoted by r2S, a relative refractive index difference of the first core 21 with respect to a clad 23 is denoted by Δ1, a relative refractive index difference of the second core 22 with respect to the clad 23 is denoted by Δ2, a refractive index volume of the first core 21 is denoted by V1S, and a refractive index volume of the second core 22 is denoted by V2S, r2S/r1S is set to be 3 or more and 5 or less, V2S/V1S is set to be 1.07r22−13.5 or more and 1.07r22−11.5 or less, and r2S/r1S is set to be −3×Δ1/Δ2+10 or more.
Abstract translation: 锥形部分31的大直径端面EF1中的第一芯21的半径由r1S表示，第二芯22的半径由r2S表示，第一芯21的相对折射率差相对于 包层23由Delta1表示，第二芯22相对于包层23的相对折射率差由Δ2表示，第一芯21的折射体积由V1S表示，折射率体积为 第二芯22由V2S表示，r2S / r1S设定为3以上且5以下，V2S / V1S设定为1.07r22-13.5以上且1.07r22-11.5以下，设定为r2S / r1S 为-3×Delta1 / Delta2 + 10以上。
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公开(公告)号：US20140010507A1
公开(公告)日：2014-01-09
申请号：US14013778
申请日：2013-08-29
Applicant: FUJIKURA LTD.
Inventor： Yusuke Sasaki , Shoichiro Matsuo , Katsuhiro Takenaga
IPC: G02B6/02
CPC classification number: G02B6/02042 , G02B6/02366 , G02B6/0365
Abstract: A multicore fiber includes a cladding and a plurality of core elements which is provided in the cladding and includes a core, an inner cladding layer that surrounds the core, and a low-refractive index layer that surrounds the inner cladding layer and has a lower average refractive index than the cladding and the inner cladding layer. The plurality of core elements is arranged such that a specific core element is surrounded by three or more core elements, and a low-refractive index layer of a partial core element of the plurality of core elements is configured to have larger light confinement loss in the core than low-refractive index layers of the other partial core elements.
Abstract translation: 多芯光纤包括包层和多个芯元件，其设置在包层中并且包括芯，围绕芯的内包层和围绕内包层并具有较低平均值的低折射率层 折射率比包层和内包层高。 多个芯元件被布置成使得特定的芯元件被三个或更多个芯元件包围，并且多个芯元件中的部分芯元件的低折射率层被配置为具有较大的光限制损耗 核心比其他部分核心元件的低折射率层。
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Patent Agency Ranking
公开(公告)号：US20130243384A1
公开(公告)日：2013-09-19
申请号：US13875851
申请日：2013-05-02
Inventor： Shoichiro Matsuo , Katsuhiro Takenaga , Kunimasa Saitoh , Masanori Koshiba
IPC: G02B6/02
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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57.发明授权公开(公告)号：US11834365B2
公开(公告)日：2023-12-05
申请号：US16636820
申请日：2018-08-07
Applicant: Fujikura Ltd.
Inventor： Yoshimichi Amma , Katsuhiro Takenaga , Ryohei Fukumoto
IPC: C03B37/027 , G02B6/02 , C03B37/012
CPC classification number: C03B37/02718 , C03B37/01222 , G02B6/02042
Abstract: An optical fiber preform production method includes: inserting at least one glass rod into at least one through-hole that penetrates a cladding glass body that is a cladding of an optical fiber; integrating a dummy rod by either integrating a solid dummy silica rod with a first end of the cladding glass body by heating the first end to close a first opening of the through-hole that opens in the first end, or forming a base end seal that closes the first opening in the first end and integrating the solid dummy silica rod with the base end; and closing a second opening of the through-hole that opens in a second end of the cladding glass body by heating and deforming the second end.
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58.发明申请公开(公告)号：US20200308043A1
公开(公告)日：2020-10-01
申请号：US16832680
申请日：2020-03-27
Applicant: Fujikura Ltd.
Inventor： Takayuki Kitamura , Nobuo Ozeki , Katsuhiro Takenaga
IPC: C03B37/029 , C03B37/03 , C03B37/023
Abstract: An optical fiber drawing furnace heating element includes a heat generator including: a tubular resistance heating element in which at least a part of an optical fiber preform is disposed in a through-hole; a first portion extending, from a first end portion, over a predetermined section along a longitudinal direction; and a second portion disposed closer to a second end portion than the first portion. The second portion has a wall thickness on a side of the first end portion being equal to or larger than a wall thickness of the first portion. The wall thickness of the second portion increases toward a side of the second end portion from the side of the first end portion.
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公开(公告)号：US10690843B2
公开(公告)日：2020-06-23
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：US10162136B2
公开(公告)日：2018-12-25
申请号：US15889931
申请日：2018-02-06
Applicant: FUJIKURA LTD.
Inventor： Kazuhiro Goi , Katsuhiro Takenaga
Abstract: An optical transmission device includes a plurality of transmitting/receiving units provided on a substrate, each transmitting/receiving unit includes: an optical transmitter; an optical receiver; a polarization combiner/splitter; and a connection portion. In the connection portions which are arranged at the positions symmetrical to each other, a direction opposite, with respect to a virtual symmetry axis, to a direction of a main electric field on a plane perpendicular to an emission direction of an optical wave of the connection portion which is emitted from one of the connection portions to an outside is substantially orthogonal to a direction of a main electric field on a plane perpendicular to an emission direction of an optical wave of the connection portion which is emitted from the other of the connection portions to an outside.
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