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公开(公告)号：EP3737979A1
公开(公告)日：2020-11-18
申请号：EP18900276.9
申请日：2018-12-21
IPC分类号： G02B6/036 , C03B37/023 , G02B6/44
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公开(公告)号：EP4318059A1
公开(公告)日：2024-02-07
申请号：EP22780997.7
申请日：2022-03-29
摘要： A multi-core optical fiber (1A) comprises a plurality of cores (10) extending along a fiber axis (C), a cladding (20) that includes the plurality of cores (10) therein and has rotational symmetry about the fiber axis (C) except for the portion thereof in which the plurality of cores (10) are provided, and a covering (30) that surrounds the cladding (20) and has rotational symmetry about the fiber axis (C). The multi-core optical fiber (1A) has non-inversion symmetry with respect to the fiber axis (C) in lateral observation images (2, 3) from at least one direction from among two directions orthogonal to the fiber axis (C).
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公开(公告)号：EP4234507A1
公开(公告)日：2023-08-30
申请号：EP21882675.8
申请日：2021-10-13
摘要： A multicore optical fiber of an embodiment has a structure for simultaneously realizing low transmission loss, low fusion splicing loss, and low inter-core crosstalk. The multicore optical fiber includes a plurality of cores comprised of silica glass, a common cladding comprised of silica glass and surrounding the plurality of cores, and a resin coating surrounding the common cladding. The common cladding has a refractive index lower than a refractive index of the plurality of cores. Each of the plurality of cores contains chlorine at 10000 ppm or more in at least part thereof.
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公开(公告)号：EP3537192A1
公开(公告)日：2019-09-11
申请号：EP19160500.5
申请日：2019-03-04
摘要： An optical fiber having an effective area that can be easily increased and bending loss characteristics that can be easily improved is provided. The optical fiber includes a glass fiber including a core and a cladding; a first resin coating layer that is in contact with the glass fiber and surrounds the glass fiber; and a second resin coating layer that surrounds the first resin coating layer and has a Young's modulus greater than a Young's modulus of the first resin coating layer. An effective area is greater than or equal to 110 µm 2 and less than or equal to 180 µm 2 at a wavelength of 1550 nm. A cable cut-off wavelength is less than or equal to 1530 nm. A uniformity of thickness of the first resin coating layer is greater than or equal to 60% and less than or equal to 80%.
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公开(公告)号：EP3525300A1
公开(公告)日：2019-08-14
申请号：EP17848805.2
申请日：2017-09-06
摘要： The present embodiment relates to an optical amplifier and the like having a structure for enabling efficient use of pumping light while avoiding complication of a device structure. In such an optical amplifier, since pumping light from a pumping light source is supplied to each core of an amplification MCF, a coupling MCF in which adjacent cores form a coupled core is arranged between the amplification MCF and the pumping light source. The pumping light source is optically connected to a specific core of the coupling MCF, and pumping light is coupled from the specific core to remaining cores except the specific core in the coupling MCF before pumping light is supplied to each core of the amplification MCF. This enables coupling of pumping light between optically connected cores between the amplification MCF and the coupling MCF.
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公开(公告)号：EP4242710A1
公开(公告)日：2023-09-13
申请号：EP21889192.7
申请日：2021-11-02
IPC分类号： G02B6/02
摘要： An MCF includes a plurality of cores each extending in a direction along a central axis and a cladding covering each of the plurality of cores. The cladding includes a low refractive index barrier. The low refractive index barrier includes an alkali metal element. A relative refractive index of the low refractive index barrier is lower than an average value of a relative refractive indices of the cladding overall. The core interval is set such that a total sum of the power coupling coefficients between a specific core among the plurality of cores and each of all remaining cores is 2.3 × 10 -4 /km or less.
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公开(公告)号：EP3955034A1
公开(公告)日：2022-02-16
申请号：EP20787375.3
申请日：2020-04-06
IPC分类号： G02B6/036
摘要： An optical fiber has a structure uniform in a longitudinal direction. This optical fiber includes: a core that includes a silica glass containing an alkali metal element; and a cladding that includes a silica glass and surrounds the core in a cross-section perpendicular to the longitudinal direction. A refractive index of the cladding is lower than a refractive index of the core. The cladding has, in the cross-section, an inner cladding layer having a circular ring shape and including an inner circumferential surface of the cladding, and an outer cladding layer having a circular ring shape and including an outer circumferential surface of the cladding. The inner cladding layer contains fluorine. The inner and outer cladding layers have refractive indexes different from each other. The outer cladding layer includes a local maximum portion where a residual stress, which is a tensile stress, becomes local maximum. A radial distance between the local maximum portion and an inner circumferential surface of the outer cladding layer is 10 µm or less.
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公开(公告)号：EP3896502A1
公开(公告)日：2021-10-20
申请号：EP19895253.3
申请日：2019-11-21
摘要： One embodiment of the present disclosure relates to an optical fiber having lower transmission loss. The optical fiber is an optical fiber comprised of silica-based glass and includes a core including a central axis and a cladding. The cladding surrounds the core and has a refractive index lower than a refractive index of the core. The core contains phosphorus, chlorine, and fluorine. The core further includes an alkali metal element or an alkaline earth metal element. In a cross section of the optical fiber orthogonal to the central axis, a ratio Rp/Ra of a radius Rp of a phosphorus-containing region with respect to a radius Ra of the core is 0.3 or more.
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公开(公告)号：EP3764134A1
公开(公告)日：2021-01-13
申请号：EP19764664.9
申请日：2019-03-04
IPC分类号： G02B6/036
摘要： An optical fiber is formed from silica glass, and includes a core, a first cladding which surrounds the core and has a refractive index lower than the refractive index of the core, and a second cladding which surrounds the first cladding and has a refractive index that is lower than the refractive index of the core and higher than the refractive index of the first cladding. The second cladding is divided into an inner region that is in contact with the first cladding and an outer region which surrounds the inner region and has a thickness that is half the thickness of the second cladding or less, while being 5 µm or more. The residual stress in at least a part of the outer region is a compressive stress, and the variation of the refractive index of the second cladding in the radial direction is 0.05% or less in terms of relative values with respect to the refractive index of pure silica glass.
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