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1.发明公开
公开(公告)号：EP4442656A1
公开(公告)日：2024-10-09
申请号：EP22898698.0
申请日：2022-11-28
发明人： OKAZAKI, Iwao , ENOMOTO, Tadashi , KOHDA, Hiroshi
IPC分类号： C03B37/027 , G01M11/00 , G02B6/02
CPC分类号： C03B37/027 , G01M11/00 , G02B6/02
摘要： A method for measuring a twist of an optical fiber is a method for measuring the twist of an optical fiber being drawn. The method includes irradiating the optical fiber with light beams from a plurality of irradiation positions spaced apart along a traveling direction of the optical fiber; detecting intensity distributions of the light beams, with which the optical fiber is irradiated and which are transmitted through the optical fiber, at a plurality of detection positions corresponding to the plurality of irradiation positions; and calculating the twist of the optical fiber based on the intensity distributions which are detected.
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公开(公告)号：EP4435481A1
公开(公告)日：2024-09-25
申请号：EP22895456.6
申请日：2022-11-04
发明人： MUKASA, Kazunori
IPC分类号： G02B6/02 , C03B37/028 , G02B6/036 , G02B6/04
CPC分类号： C03B37/028 , G02B6/04 , G02B6/036 , G02B6/02
摘要： A multicore fiber includes multiple first linear portions that include a first core portion and a first cladding portion having a refractive index lower than a maximum refractive index of the first core portion and surrounding an outer periphery of the first core portion, and a first tubular portion. The first linear portions are respectively joined to an inner wall of the first tubular portion, and two of the first linear portions are not in contact with each other on a first virtual line connecting centers of the two of the first core portions included in two of the first linear portions on a cross-section perpendicular to the longitudinal direction, at least in a portion in a longitudinal direction.
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公开(公告)号：EP3639071B1
公开(公告)日：2024-09-11
申请号：EP18816694.6
申请日：2018-06-14
IPC分类号： G02B6/02 , G02B6/028 , G01B11/16 , G01L1/24 , C03B37/012 , C03B37/027
CPC分类号： G01B11/16 , G01L1/24 , G02B6/02042 , G02B6/02395 , G02B6/02 , C03B37/01222 , C03B37/02763 , C03B37/01262 , C03B37/014 , C03B37/018 , C03B37/016 , C03B2201/3120130101 , C03B2201/3420130101 , C03B2201/4020130101 , C03B2203/2020130101 , C03B37/01231
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公开(公告)号：EP4418028A1
公开(公告)日：2024-08-21
申请号：EP22880631.1
申请日：2022-08-16
发明人： MORISHIMA Tetsu , ARAO Yuki
摘要： An optical connector according to the present disclosure suppresses fluctuations in the state of alignment of an optical fiber with respect to a housing. The optical connector comprises: an optical fiber; a ferrule assembly which has a holding portion that is provided with a ferrule and a flange; a housing which has an inner wall surface that defines an internal space in which the holding portion is housed, a reference surface that constitutes a portion of the inner wall surface, and a positioning part; and an elastic member which biases the flange toward the positioning part. The reference surface includes abutment portions which restrict the rotational orientation of the flange by being abutted against a portion of the outer peripheral surface of the flange and which are provided at two locations that are spaced from each other by a predetermined distance.
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公开(公告)号：EP4390488A1
公开(公告)日：2024-06-26
申请号：EP21954226.3
申请日：2021-08-19
发明人： YAMADA, Yusuke , NAKAJIMA, Kazuhide
摘要： An object of the present invention is to ensure low crosstalk for all multi-core optical fibers in an optical fiber cable having a plurality of identical multi-core optical fibers of non-coupling type in different spiral shapes.
An optical fiber cable according to the present disclosure is an optical fiber cable formed by twisting a plurality of units each of which is formed by bundling a plurality of identical multi-core optical fibers of non-coupling type, which includes: that all the units have the same diameter; that the units are arranged in a plurality of layers from a center in a cross section; that the units are arranged in a spiral shape for each of the layers in a longitudinal direction; that all the units included in one of the layers have the same twist pitch of the spiral shape; and that the twist pitch is different for each layer, and is set based on a curvature Rpk of the multi-core optical fiber where crosstalk is the largest.-
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公开(公告)号：EP4371952A1
公开(公告)日：2024-05-22
申请号：EP22842081.6
申请日：2022-07-11
IPC分类号： C03B37/027 , C03C13/04 , G02B6/02
CPC分类号： C03B37/027 , C03C13/04 , G02B6/02
摘要： A method for producing an optical fiber includes heating and melting an optical fiber preform and drawing the optical fiber preform. In this method for producing an optical fiber, the optical fiber is formed to include a core, a surrounding cladding surrounding a periphery of the core, and an outer cladding surrounding the surrounding cladding. In the drawn optical fiber, a maximum compressive stress of at least 100 MPa or more is applied to an optical waveguide region including at least the core.
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公开(公告)号：EP4369067A1
公开(公告)日：2024-05-15
申请号：EP22837398.1
申请日：2022-06-09
发明人： ARAO, Yuki , MORISHIMA, Tetsu , SHIBATA, Masahiro
摘要： An optical connector (10) according to one embodiment comprises: an optical fiber (50); a ferrule assembly (100); and a housing (20, 30) on the inner wall surface of which a positioning part (20A, 20B) is provided. The positioning part (20A, 20B) has an inclined surface (20A) with which a portion of the ferrule assembly (100) is brought into contact, and an opposing surface (20B). The ferrule assembly (100) includes a ferrule (110) and a sleeve member (120, 130A), and the sleeve member is configured from a sleeve (120), and a flange (130A) having edges (135) that are respectively brought into contact with the inclined surface (20A) and the opposing surface (20B). A section, which includes the edge (135) and faces the inclined surface (20A) and/or the opposing surface (20B), of an outer peripheral portion of the flange includes a set composed of a deformation absorbing part (131a) and two contact parts sandwiching the deformation absorbing part (131a) therebetween.
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公开(公告)号：EP4357310A1
公开(公告)日：2024-04-24
申请号：EP22824927.2
申请日：2022-06-10
发明人： MUKASA, Kazunori , AISO, Keiichi
摘要： An optical fiber includes a core portion made of silica-based glass; and a cladding portion made of silica-based glass having lower maximum refractive index than the core portion, the cladding portion surrounding an outer periphery of the core portion. The core portion is doped with an alkali metal element and chlorine. An average concentration of chlorine is higher than 800 atomic ppm on a cross-section perpendicular to a longitudinal direction of the core portion. A region doped with the alkali metal element is larger than a region doped with chlorine at 800 atomic ppm or higher.
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公开(公告)号：EP2821822B1
公开(公告)日：2018-11-21
申请号：EP13754773.3
申请日：2013-02-06
发明人： YAMAMOTO Yoshinori
CPC分类号： G02B6/02 , G02B6/02271 , G02B6/0286 , G02B6/036
摘要： An optical fiber according to an embodiment of the present invention is provided with a center core, a side core, and a cladding. The center core includes a ring part where a relative index difference varies discontinuously, in its peripheral region, and when a is a radius from a core center to an outside of the ring part and c is a radius to a position where the relative index difference is maximum in the side core, an index profile is realized in a shape where c/a is in the range of 2.25 to 2.50, so as to enable setting of a dispersion value, a cable cutoff wavelength, a bending loss in the diameter of 20 mm, and an effective area in desired ranges.
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