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公开(公告)号：US20180186682A1
公开(公告)日：2018-07-05
申请号：US15740246
申请日：2016-11-28
Applicant: FUJIKURA LTD.
Inventor： Takayuki Kitamura
IPC: C03B37/025 , C03B37/10
CPC classification number: C03B37/025 , C03B37/02727 , C03B37/10 , C03B2205/56 , G02B6/02
Abstract: An optical fiber production method includes: drawing an optical fiber from an optical fiber preform; and cooling the optical fiber. When in the cooling process, the optical fiber is passed through a plurality of annealing furnaces and Equation (1) is held. A time constant of relaxation of a structure of glass forming a core in the optical fiber is τ(Tn). A temperature of the optical fiber at a point in time when the optical fiber is delivered into an nth annealing furnace from an upstream side is Tn. A fictive temperature of glass forming the core at the point in time when the optical fiber is delivered is Tfn. A fictive temperature of glass forming the core after a lapse of time Δt from the point in time when the optical fiber is delivered is Tf. 20° C.
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公开(公告)号：US09002164B2
公开(公告)日：2015-04-07
申请号：US13781041
申请日：2013-02-28
Applicant: Fujikura, Ltd.
Inventor： Takayuki Kitamura , Akihito Imase , Munehisa Fujimaki
CPC classification number: G02B6/02019 , G02B6/0365
Abstract: An optical fiber is provided. The optical fiber has a refractive index profile that includes a central core, an inner cladding layer, a trench layer, and an outer cladding layer. A trench layer is provided with a reduced refractive index. The optical fiber has a large effective area without having an increase of a cutoff wavelength, and exhibits low macrobending loss.
Abstract translation: 提供光纤。 光纤具有包括中心芯，内包层，沟槽层和外包层的折射率分布。 沟槽层具有降低的折射率。 光纤具有大的有效面积而不增加截止波长，并且表现出较小的弯曲损耗。
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3.发明申请公开(公告)号：US20180370841A1
公开(公告)日：2018-12-27
申请号：US16013541
申请日：2018-06-20
Applicant: FUJIKURA LTD.
Inventor： Takayuki Kitamura
IPC: C03B37/014 , C03B37/018 , C03B37/027
Abstract: Provided is an alkali doping process of bringing a melt of an alkali metal compound or an alkaline earth metal compound into contact with a part of the inner circumferential surface of a silica glass tube, and thus doping the silica glass tube with the alkali metal compound or the alkaline earth metal compound, and in the alkali doping process, the contact location between the inner circumferential surface of the silica glass tube and the melt is moved along the longitudinal direction of the silica glass tube while rotating the silica glass tube around its longitudinal axis.
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公开(公告)号：US09772444B2
公开(公告)日：2017-09-26
申请号：US15467264
申请日：2017-03-23
Applicant: Fujikura Ltd.
Inventor： Takayuki Kitamura , Sho Endo , Tatsuya Kishi , Ryo Maruyama
CPC classification number: G02B6/03627 , C03B2201/02 , C03B2201/12 , C03B2201/20 , C03B2203/22 , C03B2203/23 , G02B6/02004 , G02B6/0365
Abstract: An optical fiber including a core and a cladding including an inner cladding layer and an outer cladding layer is provided. The refractive index of the core Δ1, the refractive index of the inner cladding layer Δ2, and the refractive index of the outer cladding layer Δ3 have a relationship denoted by the following expressions: Δ1max>Δ2min and Δ1max>Δ3, and 0.01%
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公开(公告)号：US09416043B2
公开(公告)日：2016-08-16
申请号：US14521617
申请日：2014-10-23
Applicant: FUJIKURA LTD.
Inventor： Takayuki Kitamura
IPC: C03B37/014 , C03B37/018
CPC classification number: C03B37/01413 , C03B37/01807 , C03B37/01815 , C03B2201/06 , C03B2201/50 , C03B2201/54 , C03B2207/80 , C03B2207/90
Abstract: An apparatus for manufacturing a glass perform, includes: a dummy tube section, a reservoir portion, and a cooling portion; and a glass tube section in which particles of an alkali metal compound or an alkaline earth metal compound which have flowed into the glass tube section from the dummy tube section are heated by a second heat source which performs traverse, and oxides of the particles being deposited on an inner wall and dispersed in the glass tube section. In the cooling portion of the dummy tube section, vapor of the alkali metal compound or the alkaline earth metal compound generated by heating of a first heat source is cooled and condensed by a dry gas flowing into the dummy tube section, and thereby the particles are generated.
Abstract translation: 一种玻璃制造装置，包括：虚拟管部，储存部和冷却部; 以及玻璃管部分，其中由虚拟管部分流入玻璃管部分的碱金属化合物或碱土金属化合物的颗粒被进行横越的第二热源加热，并且沉积的颗粒的氧化物 在内壁上分散在玻璃管部分。 在虚拟管部的冷却部中，通过第一热源的加热而产生的碱金属化合物或碱土金属化合物的蒸气被流入虚拟管部的干燥气体冷却并冷凝， 生成。
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Patent Agency Ranking
公开(公告)号：US11091385B2
公开(公告)日：2021-08-17
申请号：US16329164
申请日：2017-04-28
Applicant: FUJIKURA LTD.
Inventor： Takayuki Kitamura
IPC: C03B37/027 , G02B6/02 , C03C25/002
Abstract: A method for manufacturing an optical fiber includes: drawing an optical fiber from an optical fiber preform in a drawing furnace; and cooling the optical fiber in an annealing furnace. When the optical fiber enters the annealing furnace, a temperature difference between a temperature of the optical fiber and a fictive temperature of glass in a core of the optical fiber is 300° C. or less. The optical fiber is cooled for 0.01 seconds or more in the annealing furnace so that the temperature of the optical fiber becomes 1300° C. or more and 1800° C. or less.
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公开(公告)号：US11008245B2
公开(公告)日：2021-05-18
申请号：US16698472
申请日：2019-11-27
Applicant: Fujikura Ltd.
Inventor： Takayuki Kitamura , Akihito Imase
IPC: C03B37/027 , G02B6/02 , C03B37/025
Abstract: An optical fiber production method includes: drawing an optical fiber preform in a drawing furnace; and cooling the optical fiber. The optical fiber is passed through a plurality of annealing furnaces while the optical fiber is cooled. While the optical fiber is cooled, temperatures of the annealing furnaces are set such that the temperature difference is within a range between and including an upper limit and a lower limit of a temperature difference between a temperature of the optical fiber and a fictive temperature of glass constituting a core of the optical fiber at which an increase of a transmission loss of the optical fiber when the fictive temperature of the glass is decreased is less than 0.001 dB/km.
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公开(公告)号：US10927033B2
公开(公告)日：2021-02-23
申请号：US15740246
申请日：2016-11-28
Applicant: FUJIKURA LTD.
Inventor： Takayuki Kitamura
IPC: C03B37/025 , C03B37/10 , G02B6/02 , C03B37/027
Abstract: An optical fiber production method includes: drawing an optical fiber from an optical fiber preform; and cooling the optical fiber. When in the cooling process, the optical fiber is passed through a plurality of annealing furnaces and Equation (1) is held. A time constant of relaxation of a structure of glass forming a core in the optical fiber is τ(Tn). A temperature of the optical fiber at a point in time when the optical fiber is delivered into an nth annealing furnace from an upstream side is Tn. A fictive temperature of glass forming the core at the point in time when the optical fiber is delivered is Tfn. A fictive temperature of glass forming the core after a lapse of time Δt from the point in time when the optical fiber is delivered is Tf. 20° C.
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公开(公告)号：US20170203996A1
公开(公告)日：2017-07-20
申请号：US15327436
申请日：2016-05-13
Applicant: FUJIKURA LTD.
Inventor： Takayuki Kitamura , Shunichirou Hirafune
IPC: C03B37/025
CPC classification number: C03B37/0253 , C03B37/02727 , C03B2205/55 , C03B2205/56 , Y02P40/57
Abstract: There is provided a manufacturing method for an optical fiber that easily reduces transmission losses in the optical fiber. The method includes a drawing process P1 of drawing an optical fiber from an optical fiber preform 1P in a drawing furnace 110; and a slow cooling process P3 of slowly cooling the optical fiber having been drawn in the drawing process P1 in an annealing furnace 121. The temperature of the optical fiber to be delivered into the annealing furnace 121 is a temperature of 1,300° C. or more and 1,650° C. or less. The temperature of the optical fiber to be delivered out of the annealing furnace 121 is a temperature of 1,150° C. or more and 1,400° C. less.
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公开(公告)号：US20170192169A1
公开(公告)日：2017-07-06
申请号：US15467264
申请日：2017-03-23
Applicant: Fujikura Ltd.
Inventor： Takayuki Kitamura , Sho Endo , Tatsuya Kishi , Ryo Maruyama
CPC classification number: G02B6/03627 , C03B2201/02 , C03B2201/12 , C03B2201/20 , C03B2203/22 , C03B2203/23 , G02B6/02004 , G02B6/0365
Abstract: An optical fiber including a core and a cladding including an inner cladding layer and an outer cladding layer is provided. The refractive index of the core Δ1, the refractive index of the inner cladding layer Δ2, and the refractive index of the outer cladding layer Δ3 have a relationship denoted by the following expressions: Δ1max>Δ2min and Δ1max>Δ3, and 0.01%
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