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公开(公告)号：EP4053605A1
公开(公告)日：2022-09-07
申请号：EP20882049.8
申请日：2020-10-20
摘要： An optical fiber is formed from silica-based glass. The optical fiber includes a core including a central axis and a cladding surrounding the core. A refractive index of the core is greater than a refractive index of the cladding. The core contains chlorine, and one or more kinds of elements selected from an element group consisting of alkali metal elements and alkaline earth metal elements. A relative refractive index difference of the core based on a refractive index of pure silica is 0.00% or greater and 0.15% or less. An average concentration of fluorine in the cladding is 1.2% or less in a mass fraction.
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公开(公告)号：EP3187914A1
公开(公告)日：2017-07-05
申请号：EP15836456.2
申请日：2015-08-27
IPC分类号： G02B6/036
CPC分类号： G02B6/03627 , C03B2203/22 , C03B2203/23 , C03B2203/24 , G02B6/02019 , G02B6/03611 , G02B6/0365
摘要： The present embodiment relates to an optical fiber having a W-type refractive index d profile or a trench-type refractive index profile and having reduced microbending loss in a wavelength band to be actually used. The optical fiber includes a center core, an inner cladding surrounding the center core, and an outer cladding surrounding the inner cladding. The inner cladding has a refractive index lower than a refractive index of at least the center core and the outer cladding has a refractive index lower than the refractive index of the center core and higher than the refractive index of the inner cladding. Wavelength dependency of microbending loss has a local maximal value and a shortest wavelength λ th where the microbending loss becomes 10% of the local maximal value is longer than 1560 nm.
摘要翻译： 本实施例涉及具有W型折射率d分布或沟槽型折射率分布并且在实际使用的波段中具有减少的微弯损耗的光纤。 光纤包括中心芯，围绕中心芯的内包层以及围绕内包层的外包层。 内包层具有比至少中心纤芯的折射率低的折射率，并且外包层具有比中心纤芯的折射率低并且高于内包层的折射率的折射率。 微弯损耗的波长依赖性具有局部最大值和最短波长λth，其中微弯损耗变为局部最大值的10％比1560nm长。
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公开(公告)号：EP4372433A1
公开(公告)日：2024-05-22
申请号：EP22841952.9
申请日：2022-06-29
发明人： SAKUMA Hirotaka , KAWAGUCHI Yuki , SATO Shin
摘要： An optical fiber is made of silica-based glass. The optical fiber includes a core and a cladding circumscribing the core. A refractive index of the core is larger than a refractive index of the cladding. The core includes a first core having a central axis and a second core circumscribing the first core. A mean value of a mass fraction of chlorine in the first core is lower than a mean value of a mass fraction of chlorine in the second core. A mean value of a mass fraction of fluorine in the first core is higher than a mean value of a mass fraction of fluorine in the second core. A total value of the mean value of the mass fraction of chlorine and the mean value of the mass fraction of fluorine in the second core is 5000 ppm or less. The core includes either or both of an alkali metal element and an alkaline earth metal element.
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4.发明公开
公开(公告)号：EP3173388A1
公开(公告)日：2017-05-31
申请号：EP15824799.9
申请日：2015-07-21
IPC分类号： C03B37/012 , C03B37/014 , C03B37/018 , C03C13/04
CPC分类号： C03B37/01211 , C03B37/01228 , C03B37/01245 , C03B37/01248 , C03B37/01446 , C03B37/018 , C03B37/01807 , C03B37/01869 , C03B37/01892 , C03B2201/075 , C03B2201/12 , C03B2201/20 , C03B2201/50 , C03B2203/22 , C03B2203/29 , C03B2203/34 , C03C3/06 , C03C13/045 , C03C2201/11 , C03C2201/12 , C03C2201/23 , C03C2201/50 , Y02P40/57
摘要： The present invention relates to a method of manufacturing an optical fiber preform for obtaining an optical fiber with low transmission loss. A core preform included in the optical fiber preform comprises three or more core portions, which are each produced by a rod-in-collapse method, and in which both their alkali metal element concentration and chlorine concentration are independently controlled. In two or more manufacturing steps of the manufacturing steps for each of the three or more core portions, an alkali metal element is added. As a result, the mean alkali metal element concentration in the whole core preform is controlled to 7 atomic ppm or more and 70 atomic ppm or less.
摘要翻译： 本发明涉及制造用于获得具有低传输损耗的光纤的光纤预制件的方法。 包含在光纤预制棒中的纤芯预制棒包括三个或更多个芯部分，每个芯部分都是通过棒内塌缩方法制造的，并且其中它们的碱金属元素浓度和氯浓度都是独立控制的。 在三个或更多个芯部中的每一个的制造步骤的两个或更多个制造步骤中，添加碱金属元素。 结果，将整个纤芯预制棒中的平均碱金属元素浓度控制在7原子ppm以上且70原子ppm以下。
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公开(公告)号：EP4166517A1
公开(公告)日：2023-04-19
申请号：EP21822269.3
申请日：2021-05-18
发明人： HASEGAWA Takemi , KAWAGUCHI Yuki
IPC分类号： C03B37/023 , G02B6/02 , G02B6/44
摘要： An optical fiber has a central axis. The optical fiber includes a core made of silica glass and extending along the central axis, a cladding made of silica glass and surrounding the core, the cladding extending along the central axis, and a coating layer made of resin and surrounding the cladding, the coating layer extending along the central axis. An outer diameter of the cladding varies along the central axis. A residual stress in a direction along the central axis varies along the central axis, the residual stress being averaged over the core and the cladding in a cross section perpendicular to the central axis. A deviation from an average value of the outer diameter and a deviation from an average value of the residual stress have signs opposite to each other.
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公开(公告)号：EP4109150A1
公开(公告)日：2022-12-28
申请号：EP21756552.2
申请日：2021-02-18
发明人： SAKUMA Hirotaka , KAWAGUCHI Yuki , SUZUKI Masato
摘要： An optical fiber according to an embodiment has a structure capable of reducing an increase in transmission loss. The optical fiber includes a glass part extending in a direction of a central axis, and the glass part is comprised of silica-based glass, includes a core and a cladding, and has residual stress approximately uniform throughout a cross section of the glass part orthogonal to the central axis, the core having the central axis and being doped with chlorine with a mass fraction of 1% or more, the cladding surrounding the core and having a refractive index lower than a maximum refractive index of the core.
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公开(公告)号：EP3187914B1
公开(公告)日：2018-10-24
申请号：EP15836456.2
申请日：2015-08-27
CPC分类号： G02B6/03627 , C03B2203/22 , C03B2203/23 , C03B2203/24 , G02B6/02019 , G02B6/03611 , G02B6/0365
摘要： The present embodiment relates to an optical fiber having a W-type refractive index d profile or a trench-type refractive index profile and having reduced microbending loss in a wavelength band to be actually used. The optical fiber includes a center core, an inner cladding surrounding the center core, and an outer cladding surrounding the inner cladding. The inner cladding has a refractive index lower than a refractive index of at least the center core and the outer cladding has a refractive index lower than the refractive index of the center core and higher than the refractive index of the inner cladding. Wavelength dependency of microbending loss has a local maximal value and a shortest wavelength » th where the microbending loss becomes 10% of the local maximal value is longer than 1560 nm.
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公开(公告)号：EP4050388A1
公开(公告)日：2022-08-31
申请号：EP20878082.5
申请日：2020-10-13
发明人： HASEGAWA Takemi , KAWAGUCHI Yuki , SUZUKI Masato
摘要： The present disclosure relates to an optical fiber or the like that can be adapted to an optical transceiver for a short wavelength band of 850 nm or more and 1060 nm or less while maintaining compatibility with an SMF of the related art. An optical fiber of one embodiment includes a core, a cladding, and a resin coating, and has a mode field diameter of 8.2 µm or more and 9.6 µm or less at a wavelength of 1310 nm, a cable cutoff wavelength of an LP11 mode of 1060 nm or more and 1260 nm or less, and a cable cutoff wavelength of an LP02 mode of 1060 nm or less.
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