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公开(公告)号：US08958677B2
公开(公告)日：2015-02-17
申请号：US13856117
申请日：2013-04-03
Applicant: Fujikura Ltd.
Inventor： Kazuyuki Hayashi , Katsuaki Izoe , Yutaka Endoh , Kazuhiko Aikawa , Manabu Kudoh
CPC classification number: G02B6/024
Abstract: A polarization-maintaining optical fiber of the present invention includes a core, a pair of stress-applying parts provided on both sides of the core, and a cladding surrounding the core and the stress-applying parts, and is used in a wavelength range of 400 to 680 nm. The diameter of the cladding is 125 μm, the diameter of the stress-applying part is 33 to 37 μm, a distance between the pair of stress-applying parts is 8.6 to 15.4 μm, a relative refractive index difference between the core and the cladding is 0.35 to 0.45%, and a cut-off wavelength is less than or equal to 400 nm.
Abstract translation: 本发明的偏振保持光纤包括芯，设置在芯的两侧的一对应力施加部以及围绕芯和应力施加部的包层，并且在波长范围 400至680nm。 包层的直径为125μm，应力施加部的直径为33〜37μm，一对应力部分之间的距离为8.6〜15.4μm，芯与包层的相对折射率差 为0.35〜0.45％，截止波长为400nm以下。
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2.发明授权Low-loss optical fiber over wide wavelength range and method of manufacturing the same 有权宽波长范围内的低损耗光纤及其制造方法公开(公告)号：US08873915B2
公开(公告)日：2014-10-28
申请号：US13890749
申请日：2013-05-09
Applicant: Fujikura Ltd.
Inventor： Kazuhiko Aikawa , Masahiro Asano , Kazuyuki Hayashi , Masami Miyachi , Manabu Kudoh
IPC: G02B6/02 , C03B37/012
CPC classification number: G02B6/02214 , C03B37/01211 , C03B37/01217 , C03B37/0122 , C03B37/01222 , C03B2201/04 , C03B2201/10 , C03B2201/12 , C03B2201/20 , C03B2201/24 , C03B2201/28 , C03B2201/30 , C03B2201/31 , C03B2203/02 , C03B2203/12 , C03B2203/14 , C03B2203/31 , C03B2203/34 , C03B2205/40 , Y02P40/57
Abstract: A low-loss optical fiber over wide wavelength range includes a transmission loss of less than or equal to 40 dB/km in a whole wavelength range of 400-1400 nm, and being manufactured by drawing an optical fiber preform including a core composed of a silica glass having a hydroxyl-group concentration of less than or equal to 1 ppm and a cladding composed of a silica glass having a fluorine concentration of more than or equal to 3.2 wt %.
Abstract translation: 在宽波长范围内的低损耗光纤包括在400-1400nm的整个波长范围内的传输损耗小于或等于40dB / km，并且通过绘制包括由 羟基浓度小于或等于1ppm的二氧化硅玻璃和由氟浓度大于或等于3.2wt％的二氧化硅玻璃构成的包层。
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公开(公告)号：US20250130363A1
公开(公告)日：2025-04-24
申请号：US18834333
申请日：2023-01-27
Applicant: FUJIKURA LTD.
Inventor： Yoshikazu Sasaki , Kazuyuki Hayashi , Shoichiro Matsuo
Abstract: A polarization maintaining fiber includes a core, paired stress applying parts disposed on both sides of the core, and a clad encompassing the core and the paired stress applying parts. When the polarization maintaining fiber has a fiber length of 2 m and a bend radius of 140 mm, the polarization maintaining fiber has a cut-off wavelength equal to or greater than 1.41 μm and less than 1.55 μm, and when the polarization maintaining fiber has a bend radius of 5 mm and twists at a rate of one rotation per 31.4 mm of fiber length, the polarization maintaining fiber has a bending loss equal to or less than 7 dB at a wavelength of 1.55 μm.
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公开(公告)号：US20250116809A1
公开(公告)日：2025-04-10
申请号：US18834309
申请日：2023-01-27
Applicant: Fujikura Ltd.
Inventor： Yoshikazu Sasaki , Kazuyuki Hayashi , Shoichiro Matsuo
Abstract: A polarization maintaining fiber includes a core, paired stress applying parts disposed on both sides of the core, and a clad encompassing the core and the paired stress applying parts. When the polarization maintaining fiber has a fiber length of 2 m and a bend radius of 140 mm, the polarization maintaining fiber has a cut-off wavelength equal to or greater than 1.20 μm and less than 1.31 μm. When the polarization maintaining fiber has a bend radius of 5 mm and twists at a rate of one rotation per 31.4 mm of fiber length, the polarization maintaining fiber has a bending loss equal to or less than 6.6 dB at a wavelength of 1.31 μm.
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Patent Agency Ranking
公开(公告)号：US20190204512A1
公开(公告)日：2019-07-04
申请号：US16329145
申请日：2017-05-30
Applicant: FUJIKURA LTD.
Inventor： Keisuke Hirakawa , Kentaro Ichii , Kazuyuki Hayashi
Abstract: An optical fiber includes: a core that includes quartz glass doped with a core updopant; an inner cladding that includes quartz glass doped with a cladding updopant and a downdopant and that covers a circumferential surface of the core; and an outer cladding that includes quartz glass and that covers an outer circumferential surface of the inner cladding. A refractive index of the inner cladding is substantially equal to a refractive index of the outer cladding. The inner cladding contains the cladding updopant at a concentration such that a refractive index increase rate ascribed to the cladding updopant falls within a range of 0.25% to 0.5%.
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公开(公告)号：US09897751B2
公开(公告)日：2018-02-20
申请号：US15329741
申请日：2016-05-12
Applicant: FUJIKURA LTD.
Inventor： Kazuyuki Hayashi , Katsuaki Izoe , Kazuhiko Aikawa
CPC classification number: G02B6/02042 , G02B6/02 , G02B6/02314 , G02B6/024
Abstract: A multicore polarization-maintaining fiber 10 includes a plurality of cores 11, a cladding 12 surrounding the plurality of cores 11, and a plurality of stress applying parts 15 provided sandwiching the plurality of cores 11 in a region surrounded by the outer circumferential surface of the cladding 12. The cross sectional area of the stress applying part 15 is greater than the cross sectional area of the core 11. Stress applying parts 15 of the plurality of stress applying parts 15 are disposed in a first direction, and stress applying parts 15 of the plurality of stress applying parts 15 are disposed in a second direction different from the first direction.
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公开(公告)号：US09400352B2
公开(公告)日：2016-07-26
申请号：US14628450
申请日：2015-02-23
Applicant: FUJIKURA LTD.
Inventor： Kazuyuki Hayashi , Katsuaki Izoe
CPC classification number: G02B6/024 , C03B2203/22 , C03B2203/30 , G02B6/0365
Abstract: A polarization-maintaining optical fiber of the invention includes: a core; a pair of stress-applying parts disposed at both sides of the core at a distance; and a cladding coat that surrounds the core and the paired stress-applying parts. The maximum refractive index of the core is greater than each of maximum refractive indexes of a first cladding coat, a second cladding coat, and a third cladding coat. The maximum refractive index of the second cladding coat is lower than each of maximum refractive indexes of the first cladding coat and the third cladding coat. The coefficient of thermal expansion of each of stress-applying parts is greater than a coefficient of thermal expansion of the cladding coat. Each stress-applying part is provided to cut the second cladding coat at a position in a circumferential direction.
Abstract translation: 本发明的偏振保持光纤包括：芯; 一对应力部件设置在芯部的两侧一段距离; 以及围绕芯部和成对的应力施加部件的包层涂层。 芯的最大折射率大于第一包覆层，第二覆层和第三覆层的最大折射率。 第二包覆层的最大折射率低于第一包覆层和第三覆层的最大折射率。 每个应力施加部件的热膨胀系数大于包覆层的热膨胀系数。 每个应力施加部分被设置成在圆周方向上的位置处切割第二包覆层。
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公开(公告)号：US10670812B2
公开(公告)日：2020-06-02
申请号：US16329145
申请日：2017-05-30
Applicant: FUJIKURA LTD.
Inventor： Keisuke Hirakawa , Kentaro Ichii , Kazuyuki Hayashi
Abstract: An optical fiber includes: a core that includes quartz glass doped with a core updopant; an inner cladding that includes quartz glass doped with a cladding updopant and a downdopant and that covers a circumferential surface of the core; and an outer cladding that includes quartz glass and that covers an outer circumferential surface of the inner cladding. A refractive index of the inner cladding is substantially equal to a refractive index of the outer cladding. The inner cladding contains the cladding updopant at a concentration such that a refractive index increase rate ascribed to the cladding updopant falls within a range of 0.25% to 0.5%.
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9.发明申请公开(公告)号：US20200012041A1
公开(公告)日：2020-01-09
申请号：US16495870
申请日：2018-03-22
Applicant: FUJIKURA LTD.
Inventor： Kentaro Ichii , Keisuke Hirakawa , Kazuyuki Hayashi
Abstract: A polarization maintaining fiber includes: a core; an inner cladding enclosing the core; two stress applying parts that sandwich the inner cladding therebetween; and an outer cladding enclosing the inner cladding and the two stress applying parts. Each of the two stress applying parts is depressed inward against the inner cladding, and the core has a flattened cross section having a long-axis that corresponds to a direction in which the two stress applying parts are aligned.
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