Patents by Inventor Masanori Koshiba
Masanori Koshiba has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9557476Abstract: A multicore fiber includes six or more of core elements having a core, a first clad surrounding the outer circumferential surface of the core and a second clad surrounding the outer circumferential surface of the first clad, and includes a clad surrounding the core elements. All of expressions are satisfied: n1>n2>n3, n1>n4, n3<n4, wherein the refractive index of the core is n1, the refractive index of the first clad is n2, the refractive index of the second clad is n3, and the refractive index of the clad is n4. The core elements are disposed so that the inter-center pitch between the cores adjacent to each other is disposed at regular spacing and the centers of the cores are annularly disposed.Type: GrantFiled: July 17, 2014Date of Patent: January 31, 2017Assignees: FUJIKURA LTD., NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITYInventors: Shoichiro Matsuo, Kunimasa Saitoh, Masanori Koshiba
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Publication number: 20150316715Abstract: A multicore fiber includes six or more of core elements having a core, a first clad surrounding the outer circumferential surface of the core and a second clad surrounding the outer circumferential surface of the first clad, and includes a clad surrounding the core elements. All of expressions are satisfied: n1>n2>n3, n1>n4, n3<n4, wherein the refractive index of the core is n1, the refractive index of the first clad is n2, the refractive index of the second clad is n3, and the refractive index of the clad is n4. The core elements are disposed so that the inter-center pitch between the cores adjacent to each other is disposed at regular spacing and the centers of the cores are annularly disposed.Type: ApplicationFiled: July 17, 2014Publication date: November 5, 2015Applicants: FUJIKURA LTD., NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITYInventors: Shoichiro Matsuo, Kunimasa Saitoh, Masanori Koshiba
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Patent number: 9081129Abstract: A multi-core fiber includes an even number of six or more of cores and a clad that surrounds the outer circumferential surfaces of the cores. The cores are formed of two types of cores and in which an effective refractive index difference in a fundamental mode is 0.002 or less in a predetermined range or more that the effective refractive index difference in the fundamental mode is varied according to a core pitch. Two types of the cores are alternately and annularly disposed at regular spacings. A difference in the mode field diameter of light propagating through the cores is 1 ?m or less.Type: GrantFiled: July 17, 2014Date of Patent: July 14, 2015Assignees: FUJIKURA LTD., NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITYInventors: Shoichiro Matsuo, Kunimasa Saitoh, Masanori Koshiba
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Patent number: 9069118Abstract: A radius of a first core 21 in a large-diameter end surface EF1 of a tapered portion 31 is denoted by r1S, a radius of a second core 22 is denoted by r2S, a relative refractive index difference of the first core 21 with respect to a clad 23 is denoted by ?1, a relative refractive index difference of the second core 22 with respect to the clad 23 is denoted by ?2, a refractive index volume of the first core 21 is denoted by V1S, and a refractive index volume of the second core 22 is denoted by V2S, r2S/r1S is set to be 3 or more and 5 or less, V2S/V1S is set to be 1.07r22?13.5 or more and 1.07r22?11.5 or less, and r2S/r1S is set to be ?3×?1/?2+10 or more.Type: GrantFiled: July 8, 2013Date of Patent: June 30, 2015Assignees: FUJIKURA LTD., NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITYInventors: Shoichiro Matsuo, Katsuhiro Takenaga, Kunimasa Saitoh, Masanori Koshiba
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Patent number: 8971685Abstract: A multicore fiber includes a plurality of core elements; and a clad surrounding an outer periphery surface of each of the core elements, and each of the core elements includes a core, a first clad surrounding the outer periphery surface of the core and a second clad surrounding an outer periphery surface of the first clad, and when a refractive index of the core is n1, a refractive index of the first clad is n2, a refractive index of the second clad is n3 and a refractive index of the clad is n4, all of n1>n2>n3, n1>n4 and n3<n4 are satisfied.Type: GrantFiled: May 2, 2013Date of Patent: March 3, 2015Assignees: Fujikura Ltd., National University Corporation Hokkaido UniversityInventors: Shoichiro Matsuo, Katsuhiro Takenaga, Kunimasa Saitoh, Masanori Koshiba
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Publication number: 20140334789Abstract: A multi-core fiber includes an even number of six or more of cores and a clad that surrounds the outer circumferential surfaces of the cores. The cores are formed of two types of cores and in which an effective refractive index difference in a fundamental mode is 0.002 or less in a predetermined range or more that the effective refractive index difference in the fundamental mode is varied according to a core pitch. Two types of the cores are alternately and annularly disposed at regular spacings. A difference in the mode field diameter of light propagating through the cores is 1 ?m or less.Type: ApplicationFiled: July 17, 2014Publication date: November 13, 2014Applicants: FUJIKURA LTD., NAT'L UNIVERSITY CORPORATION HOKKAIDO UNIVERSITYInventors: Shoichiro Matsuo, Kunimasa Saitoh, Masanori Koshiba
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Patent number: 8811786Abstract: The multi-core fiber of the present invention uses a multi-core fiber configuration, compatible with the “coupled” operation mode in which coupling between cores is positively utilized, to carry out mode division multiplexing transmission via a multi-core fiber that contains multiple single-mode cores in one optical fiber. The multi-core fiber of the present invention uses a configuration in which mode multiplexing transmission is carried out using a multi-core fiber that contains multiple single-mode cores in one optical fiber, wherein multiple cores are strongly coupled intentionally to form a coupled multi-core fiber that makes the coupled modes correspond, one to one, to the transmission channels.Type: GrantFiled: October 2, 2009Date of Patent: August 19, 2014Assignees: National University Corporation Yokohama National University, National University Corporation Hokkaido UniversityInventors: Yasuo Kokubun, Masanori Koshiba, Toshio Morioka
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Publication number: 20140010508Abstract: A radius of a first core 21 in a large-diameter end surface EF1 of a tapered portion 31 is denoted by r1S, a radius of a second core 22 is denoted by r2S, a relative refractive index difference of the first core 21 with respect to a clad 23 is denoted by ?1, a relative refractive index difference of the second core 22 with respect to the clad 23 is denoted by ?2, a refractive index volume of the first core 21 is denoted by V1S, and a refractive index volume of the second core 22 is denoted by V2S, r2S/r1S is set to be 3 or more and 5 or less, V2S/V1S is set to be 1.07r22?13.5 or more and 1.07r22?11.5 or less, and r2S/r1S is set to be ?3×?1/?2+10 or more.Type: ApplicationFiled: July 8, 2013Publication date: January 9, 2014Inventors: Shoichiro Matsuo, Katsuhiro Takenaga, Kunimasa Saitoh, Masanori Koshiba
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Publication number: 20130243384Abstract: A multicore fiber includes a plurality of core elements; and a clad surrounding an outer periphery surface of each of the core elements, and each of the core elements includes a core, a first clad surrounding the outer periphery surface of the core and a second clad surrounding an outer periphery surface of the first clad, and when a refractive index of the core is n1, a refractive index of the first clad is n2, a refractive index of the second clad is n3 and a refractive index of the clad is n4, all of n1>n2>n3, n1>n4 and n3<n4 are satisfied.Type: ApplicationFiled: May 2, 2013Publication date: September 19, 2013Applicants: NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITY, FUJIKURA LTD.Inventors: Shoichiro Matsuo, Katsuhiro Takenaga, Kunimasa Saitoh, Masanori Koshiba
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Patent number: 8503847Abstract: A multi-core fiber of the present invention employs the multi-core fiber mode, which corresponds to the “uncoupled” operation aspect in which individual cores are used independently for single-mode transmission, to perform space division multiplexing transmission using a multi-core fiber in which multiple single-mode cores are stored in one optical fiber. More specifically, the multi-core fiber of the present invention forms an uncoupled multi-core fiber that makes individual cores correspond to single-mode, independent transmission channels.Type: GrantFiled: October 2, 2009Date of Patent: August 6, 2013Assignees: National University Corporation Yokohama National University, National University Corporation Hokkaido UniversityInventors: Yasuo Kokubun, Masanori Koshiba, Toshio Morioka
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Publication number: 20110243517Abstract: A multi-core fiber of the present invention employs the multi-core fiber mode, which corresponds to the “uncoupled” operation aspect in which individual cores are used independently for single-mode transmission, to perform space division multiplexing transmission using a multi-core fiber in which multiple single-mode cores are stored in one optical fiber. More specifically, the multi-core fiber of the present invention forms an uncoupled multi-core fiber that makes individual cores correspond to single-mode, independent transmission channels.Type: ApplicationFiled: October 2, 2009Publication date: October 6, 2011Applicants: National University Corporation Yokohama National University, National University Corporation Hokkaido UniversitInventors: Yasuo Kokubun, Masanori Koshiba, Toshio Morioka
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Publication number: 20110188855Abstract: The multi-core fiber of the present invention uses a multi-core fiber configuration, compatible with the “coupled” operation mode in which coupling between cores is positively utilized, to carry out mode division multiplexing transmission via a multi-core fiber that contains multiple single-mode cores in one optical fiber. The multi-core fiber of the present invention uses a configuration in which mode multiplexing transmission is carried out using a multi-core fiber that contains multiple single-mode cores in one optical fiber, wherein multiple cores are strongly coupled intentionally to form a coupled multi-core fiber that makes the coupled modes correspond, one to one, to the transmission channels.Type: ApplicationFiled: October 2, 2009Publication date: August 4, 2011Applicants: NATIONAL UNIVERSITY CORPORATION YOKOHAMA NATIONAL UNIVERSITY, NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITInventors: Yasuo Kokubun, Masanori Koshiba, Toshio Morioka
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Patent number: 7075390Abstract: The surface acoustic wave device has the surface acoustic wave transducer, which consists of the positive electrode finger 102, the negative electrode finger 204, and the floating electrode 300, which are formed on the surface of the langasite single crystal substrate, where the substrate orientation and the surface acoustic wave propagation direction are chosen so that it may have the natural unidirectional property. When the wavelength of the surface acoustic wave is ?, each above-mentioned electrode is formed along the surface acoustic wave propagation direction, so that the width of above-mentioned positive electrode finger and the negative electrode finger may be about ?/8, the distance g between each center of the positive electrode finger and the floating electrode may be 13/40??g?14/40?, and the width W of the floating electrode may be 11/40??W?13/40?.Type: GrantFiled: October 31, 2000Date of Patent: July 11, 2006Assignee: Mitsubishi Materials CorporationInventors: Akihiro Bungo, Ryohei Kimura, Koji Hasegawa, Masanori Koshiba
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Patent number: 6985660Abstract: An optical fiber comprises a core region extending along a predetermined axis X, and a cladding region surrounding the core region. The cladding region 14 comprises first to (N+1)-th regions such that the first region surrounds the core region, and the (k+1)-th region surrounds the k-th region (k=1, 2, . . . , N). At least one of the first to (N+1)-th regions includes, in a main medium having a predetermined refractive index, a sub-region made of an auxiliary medium having a refractive index different from that of the main medium. Letting n[0] be the average refractive index of the core region, and n[k] (k=1, 2, . . . , N+1) be the average refractive index of the k-th region, this optical fiber satisfies the relationship of n[0]>n[1], and n[i]>n[i+1] (?i=h, h+1, . . . , h+m; where h and m are natural numbers).Type: GrantFiled: December 10, 2003Date of Patent: January 10, 2006Assignee: Sumitomo Electric Industries, Ltd.Inventors: Masanori Koshiba, Kunimasa Saitoh
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Publication number: 20040114897Abstract: An optical fiber comprises a core region extending along a predetermined axis X, and a cladding region surrounding the core region. The cladding region 14 comprises first to (N+1)-th regions such that the first region surrounds the core region, and the (k+1)-th region surrounds the k-th region (k=1, 2, . . . , N). At least one of the first to (N+1)-th regions includes, in a main medium having a predetermined refractive index, a sub-region made of an auxiliary medium having a refractive index different from that of the main medium. Letting n[0] be the average refractive index of the core region, and n[k] (k=1, 2, . . . , N+1) be the average refractive index of the k-th region, this optical fiber satisfies the relationship of n[0]>n[1], and n[i]>n[i+1] (∀i=h, h+1, . . . , h+m; where h and m are natural numbers).Type: ApplicationFiled: December 10, 2003Publication date: June 17, 2004Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Masanori Koshiba, Kunimasa Saitoh