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公开(公告)号：US09075185B2
公开(公告)日：2015-07-07
申请号：US13754963
申请日：2013-01-31
发明人： Naomi Kumano , Iwao Shimotakahara , Ryuichi Sugizaki , Takeshi Yagi , Tomoya Shimizu , Takashi Matsui , Yukihiro Goto , Toshio Kurashima , Kazuhide Nakajima
CPC分类号： G02B6/032 , G02B6/02333 , G02B6/02366 , G02B6/03627
摘要： A hole-assisted optical fiber includes a core portion and a cladding portion that includes an inner cladding layer, an outer cladding layer, and holes formed around the core portion. A diameter of the core portion is 3 μm to 9.8 μm, a relative refractive index difference of the core portion relative to the outer cladding layer is 0.11% to 0.45%, an outside diameter of the inner cladding layer is 53 μm or less, a relative refractive index difference of the inner cladding layer relative to the outer cladding layer is a negative value, −0.30% or more, a diameter of each hole is 2.4 μm to 4.0 μm, a hole occupancy rate is 17% to 48%, a bending loss at a wavelength of 1625 nm when bent at a radius of 5 mm is 1 dB/turn or less, and a cut-off wavelength is 1550 nm or less.
摘要翻译： 空穴辅助光纤包括芯部和包括内包层，外包层和形成在芯部周围的孔的包层部分。 芯部的直径为3μm〜9.8μm，芯部相对于外包层的相对折射率差为0.11〜0.45％，内包层的外径为53μm以下， 内包层相对于外包层的相对折射率差为负值-0.30％以上，各孔的直径为2.4μm〜4.0μm，孔占有率为17〜48％，a 以5mm的半径弯曲时，波长1625nm处的弯曲损耗为1dB /匝以下，截止波长为1550nm以下。
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公开(公告)号：US20130136409A1
公开(公告)日：2013-05-30
申请号：US13754963
申请日：2013-01-31
发明人： Naomi Kumano , Iwao Shimotakahara , Ryuichi Sugizaki , Takeshi Yagi , Tomoya Shimizu , Takashi Matsui , Yukihiro Goto , Toshio Kurashima , Kazuhide Nakajima
IPC分类号： G02B6/032
CPC分类号： G02B6/032 , G02B6/02333 , G02B6/02366 , G02B6/03627
摘要： A hole-assisted optical fiber includes a core portion and a cladding portion that includes an inner cladding layer, an outer cladding layer, and holes formed around the core portion. A diameter of the core portion is 3 μm to 9.8 μm, a relative refractive index difference of the core portion relative to the outer cladding layer is 0.11% to 0.45%, an outside diameter of the inner cladding layer is 53 μm or less, a relative refractive index difference of the inner cladding layer relative to the outer cladding layer is a negative value, −0.30% or more, a diameter of each hole is 2.4 μm to 4.0 μm, a hole occupancy rate is 17% to 48%, a bending loss at a wavelength of 1625 nm when bent at a radius of 5 mm is 1 dB/turn or less, and a cut-off wavelength is 1550 nm or less.
摘要翻译： 空穴辅助光纤包括芯部和包括内包层，外包层和形成在芯部周围的孔的包层部分。 芯部的直径为3μm〜9.8μm，芯部相对于外包层的相对折射率差为0.11〜0.45％，内包层的外径为53μm以下，a 内包层相对于外包层的相对折射率差为-0.30％以上的负值，每个孔的直径为2.4μm〜4.0μm，孔占有率为17〜48％，a 以5mm的半径弯曲时，波长1625nm处的弯曲损耗为1dB /匝以下，截止波长为1550nm以下。
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公开(公告)号：US11237322B2
公开(公告)日：2022-02-01
申请号：US16571974
申请日：2019-09-16
发明人： Shinichi Arai , Harumi Inaba , Shigeto Matsumoto , Takeshi Yagi , Shinichi Aozasa , Kyozo Tsujikawa , Kazuhide Nakajima
摘要： An optical fiber manufacturing method includes setting a first holding member and a rod inside a glass pipe, the first holding member made of glass and having plural holes formed, so that the rod is supported by the first holding member; filling glass particles between the rod and a glass pipe inner wall; holding the rod such that the rod and the filled glass particles are enclosed by the glass pipe inner wall and the first and second holding members, and sealing one end of the glass pipe and manufacturing an intermediate; and manufacturing an optical fiber from the intermediate, wherein a bulk density of the first and second holding members is set with reference to a bulk density of a filling portion made from the glass particles, and the predetermined range is determined according to a core diameter permissible variation range in its longitudinal direction.
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公开(公告)号：US20200012042A1
公开(公告)日：2020-01-09
申请号：US16571974
申请日：2019-09-16
发明人： Shinichi ARAI , Harumi Inaba , Shigeto Matsumoto , Takeshi Yagi , Shinichi Aozasa , Kyozo Tsujikawa , Kazuhide Nakajima
摘要： An optical fiber manufacturing method includes setting a first holding member and a rod inside a glass pipe, the first holding member made of glass and having plural holes formed, so that the rod is supported by the first holding member; filling glass particles between the rod and a glass pipe inner wall; holding the rod such that the rod and the filled glass particles are enclosed by the glass pipe inner wall and the first and second holding members, and sealing one end of the glass pipe and manufacturing an intermediate; and manufacturing an optical fiber from the intermediate, wherein a bulk density of the first and second holding members is set with reference to a bulk density of a filling portion made from the glass particles, and the predetermined range is determined according to a core diameter permissible variation range in its longitudinal direction.
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公开(公告)号：US11474303B2
公开(公告)日：2022-10-18
申请号：US17279980
申请日：2019-09-11
发明人： Masaaki Takaya , Yoshiteru Abe , Ryo Koyama , Chisato Fukai , Kazunori Katayama , Kazuhide Nakajima , Yusuke Yamada
IPC分类号： G02B6/38
摘要： An object is to provide an optical fiber connector ferrule, a sleeve, and a method for manufacturing a ferrule member that can avoid an increase in manufacturing time and an increase in cost of optical connectors for connecting multicore optical fibers. The present invention provides an optical fiber connector ferrule, a sleeve, and a method for manufacturing ferrule member which realizes alignment of multicore optical fibers corresponding to the connection by mounting a ferrule on a multicore fiber and then cutting a ferrule member instead of aligning core positions by rotating an axis of an optical fiber and adjusting positions of cores to the ferrule, leading to simplification of a rotational alignment step.
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公开(公告)号：US11366266B2
公开(公告)日：2022-06-21
申请号：US16623608
申请日：2018-07-03
发明人： Yuto Sagae , Kazuhide Nakajima , Takashi Matsui
摘要： An optical fiber includes a core, a first clad that is provided on an outer circumferential portion of the core and has a refractive index lower than that of the core, and a second clad that is provided on an outer circumferential portion of the first clad and has a refractive index lower than that of the first clad. In the optical fiber, a mode field diameter at a wavelength of 1.55 μm is equal to or greater than 11.5 μm, a cutoff wavelength is equal to or less than 1.53 μm, a bending loss at a bending radius of 30 mm and a wavelength of 1.625 μm is equal to or less than 2.0 dB/100 turns, and a delay time of transmission light per unit length at a wavelength of 1.55 μm is equal to or less than 4.876 μs/km.
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公开(公告)号：US10955622B2
公开(公告)日：2021-03-23
申请号：US16770531
申请日：2018-12-20
发明人： Takashi Matsui , Kazuhide Nakajima , Masaki Wada , Yoko Yamashita
IPC分类号： G02B6/38
摘要： According to the connection device, the connection method, the optical connector manufacturing device, and the method for manufacturing an optical connector, rotation alignment of an MCF becomes unnecessary because an image of an end surface of the MCF to be connected is captured, the position of the core is located, and an optical waveguide is formed on a substrate so as to match the position. Thus, it is possible to solve the problem of increasing loss or complex connection work caused by rotational misalignment in association with rotation alignment.
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公开(公告)号：US10585235B2
公开(公告)日：2020-03-10
申请号：US16313724
申请日：2017-06-21
摘要： An optical connector is provided which includes at least one multi-core block fixing and holding a plurality of multi-core optical fibers in a state where a position in a direction orthogonal to an optical axis of each multi-core optical fiber and a rotation angle around the optical axis are in a predetermined state, and a ferrule including an accommodating portion accommodating the multi-core block.
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公开(公告)号：US11899237B2
公开(公告)日：2024-02-13
申请号：US17294892
申请日：2019-11-08
发明人： Takashi Matsui , Kazuhide Nakajima
CPC分类号： G02B6/02042 , G02B27/0012
摘要： It is an object of the present invention to provide a multicore optical fiber, a design method for the multicore optical fiber and an optical transmission method using the multicore optical fiber including four cores having a standard cladding diameter of 125±1 μm for an existing single mode optical fiber covering several thousands of kilometers of transmission. The multicore optical fiber according to the present invention disposes two-stage claddings with different refractive indices around each core, and designates as a predetermined range, a core radius a1, a radius a2 of a first cladding region surrounding each core, specific refractive index Δ1 relative to the core of the first cladding region and a specific refractive index Δ2 relative to the core of a second cladding region including four cores and the first cladding region.
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公开(公告)号：US11860405B2
公开(公告)日：2024-01-02
申请号：US17641061
申请日：2019-09-18
发明人： Saki Nozoe , Nobutomo Hanzawa , Yuto Sagae , Kazuhide Nakajima , Kyozo Tsujikawa
CPC分类号： G02B6/02347 , G02B6/02361 , G02B6/02366 , G02B6/032 , G02B6/036
摘要： An object of the present invention is to provide an HAF having a structure in which the number of air holes is decreased to be smaller than that of a PCF and Rayleigh scattering loss may be more reduced than that in the existing HAF. The HAF according to the present invention includes a core portion having a uniform optical refractive index; a cladding portion having a uniform optical refractive index and surrounding the core portion; and a plurality of air holes arranged in two layers at positions configuring hexagonal closest packing excluding the core portion within the cladding portion along a longitudinal direction of the hole-assisted fiber, wherein a center-to-center spacing of the air holes is a sum of a radius Rin of an inscribed circle inscribed in the air holes in an inner layer and a radius d/2 of the air hole, and a radius “a” of the core portion and a relative refractive index difference Δ between the core portion and the cladding portion are present within a range where Rn, which is a ratio of a Rayleigh scattering coefficient Rsmf of a single mode optical fiber and an effective Rayleigh scattering coefficient Reff of the hole-assisted fiber, is equal to or less than 0.92.
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