Patents by Inventor Nobuaki Hatori
Nobuaki Hatori 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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Publication number: 20230378716Abstract: An optical semiconductor device includes a first optical device formed on a silicon substrate having a first surface, and a second optical device including a compound semiconductor, mounted on the first optical device, and having a second surface facing the first surface. The first optical device includes a first protrusion that protrudes toward the second surface, and a portion of the second surface makes contact with the first protrusion. In a plan view, the first protrusion is located on an inner side of an outer edge of the second optical device.Type: ApplicationFiled: April 24, 2023Publication date: November 23, 2023Applicant: Fujitsu Optical Components LimitedInventor: Nobuaki HATORI
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Patent number: 11177623Abstract: An optical device includes a light-emitting element; an electronic circuit chip; a substrate on which the light-emitting element and the electronic circuit chip are mounted; a first electrode formed on a first mounting surface of the light-emitting element on the substrate; and a second electrode formed on a second mounting surface of the electronic circuit chip on the substrate. The first electrode and the second electrode have the same structure.Type: GrantFiled: October 21, 2019Date of Patent: November 16, 2021Assignees: FUJITSU LIMITED, NEC CORPORATION, PHOTONICS ELECTRONICS TECHNOLOGY RESEARCH ASSOCIATIONInventors: Nobuaki Hatori, Keizo Kinoshita
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Patent number: 10958036Abstract: A semiconductor light-emitting device includes an active layer including quantum dots, a diffraction grating, a low-reflectance film disposed at a light-emitting end of the active layer, and a high-reflectance film disposed at another end of the active layer and having an optical reflectance higher than an optical reflectance of the low-reflectance film.Type: GrantFiled: October 30, 2018Date of Patent: March 23, 2021Assignees: FUJITSU LIMITED, PHOTONICS ELECTRONICS TECHNOLOGY RESEARCH ASSOCIATIONInventor: Nobuaki Hatori
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Publication number: 20200132951Abstract: An optical device includes a light-emitting element; an electronic circuit chip; a substrate on which the light-emitting element and the electronic circuit chip are mounted; a first electrode formed on a first mounting surface of the light-emitting element on the substrate; and a second electrode formed on a second mounting surface of the electronic circuit chip on the substrate. The first electrode and the second electrode have the same structure.Type: ApplicationFiled: October 21, 2019Publication date: April 30, 2020Applicants: FUJITSU LIMITED, NEC Corporation, Photonics Electronics Technology Research AssociationInventors: Nobuaki HATORI, Keizo KINOSHITA
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Publication number: 20190131761Abstract: A semiconductor light-emitting device includes an active layer including quantum dots, a diffraction grating, a low-reflectance film disposed at a light-emitting end of the active layer, and a high-reflectance film disposed at another end of the active layer and having an optical reflectance higher than an optical reflectance of the low-reflectance film.Type: ApplicationFiled: October 30, 2018Publication date: May 2, 2019Applicants: FUJITSU LIMITED, Photonics Electronics Technology Research AssociationInventor: Nobuaki Hatori
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Patent number: 9964704Abstract: A spot-size converter includes a substrate, a first core provided over the substrate, and second and third cores provided over the substrate and over or under the first core with a cladding layer sandwiched therebetween and extending in parallel to the substrate and the first core.Type: GrantFiled: January 28, 2014Date of Patent: May 8, 2018Assignees: FUJITSU LIMITED, NEC CORPORATIONInventors: Nobuaki Hatori, Masashige Ishizaka, Takanori Shimizu
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Patent number: 9904011Abstract: An optical waveguide includes a substrate, a first core provided over the substrate and having a first taper region that extends from one side toward the other side and has a sectional area that decreases toward the other side, and a plurality of second cores provided over the substrate and over or under the first core with a first cladding layer sandwiched therebetween and extending in parallel to the substrate and the first core.Type: GrantFiled: January 28, 2014Date of Patent: February 27, 2018Assignees: FUJITSU LIMITED, NEC CORPORATIONInventors: Nobuaki Hatori, Masashige Ishizaka, Takanori Shimizu
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Patent number: 9871347Abstract: A semiconductor light source includes a substrate, an optical waveguide having a reflection structure provided on the substrate with an oxide film in between and a semiconductor light emitting element provided on the optical waveguide. The optical waveguide includes a constant width core layer portion located in a center portion, tapered core layer portions that are provided on either side of the constant width core layer and of which the core width gradually increases and a constant width core layer portion for an optical wire waveguide. The semiconductor light emitting element is placed so as to cover at least a portion of the tapered core layer portions on both sides.Type: GrantFiled: September 30, 2016Date of Patent: January 16, 2018Assignees: FUJITSU LIMITED, NEC CORPORATION, THE UNIVERSITY OF TOKYOInventors: Nobuaki Hatori, Masashige Ishizaka, Takanori Shimizu, Yasuhiko Arakawa, Satoshi Iwamoto, Katsuaki Tanabe
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Publication number: 20170098922Abstract: A semiconductor light source includes a substrate, an optical waveguide having a reflection structure provided on the substrate with an oxide film in between and a semiconductor light emitting element provided on the optical waveguide. The optical waveguide includes a constant width core layer portion located in a center portion, tapered core layer portions that are provided on either side of the constant width core layer and of which the core width gradually increases and a constant width core layer portion for an optical wire waveguide. The semiconductor light emitting element is placed so as to cover at least a portion of the tapered core layer portions on both sides.Type: ApplicationFiled: September 30, 2016Publication date: April 6, 2017Applicants: FUJITSU LIMITED, NEC Corporation, The University of TokyoInventors: Nobuaki Hatori, Masashige Ishizaka, Takanori Shimizu, Yasuhiko Arakawa, Satoshi Iwamoto, Katsuaki Tanabe
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Patent number: 9612411Abstract: Light that returns through reflection from the optical connection portion between a semiconductor optical waveguide and an optically functional element is reduced through the use of a simplified structure in a semiconductor optical waveguide device. The device is provided with an anti-reflection diffraction grating having the period to prevent light that has been led through the semiconductor optical waveguide towards the portion connected to the optically functional element from being reflected in the direction from which the light has been led.Type: GrantFiled: March 20, 2015Date of Patent: April 4, 2017Assignees: FUJITSU LIMITED, NEC CORPORATIONInventors: Nobuaki Hatori, Masashige Ishizaka, Takanori Shimizu
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Patent number: 9429706Abstract: An optical waveguide coupler includes a substrate and an optical waveguide of a multi-layer structure of a first clad layer/a first waveguide layer/a second clad layer, at least, on the end surface side of an optical input and output provided on the substrate, characterized in that the first waveguide layer has such a distribution of the refractive index that the refractive index is the highest at the center of the first waveguide layer in the multi-layer structure in the stacking direction, and the first waveguide layer has such a protrusion in a convex form that the center portion having the highest refractive index protrudes in a cross section that is perpendicular to the end surface of the optical input and output and perpendicular to the main surface of the substrate.Type: GrantFiled: March 19, 2015Date of Patent: August 30, 2016Assignees: FUJITSU LIMITED, NEC CORPORATIONInventors: Nobuaki Hatori, Masashige Ishizaka, Takanori Shimizu
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Patent number: 9297956Abstract: An optical device includes: a first cladding layer; a core layer disposed on the first cladding layer and, with increase in its sectional area, extending from a first end which receives/outputs light along a direction from the first end toward a second end; a slab layer disposed on the first cladding layer and extending to the second end along the direction from the first end toward the second end; a rib layer disposed on the slab layer and, with decrease in its sectional area, extending to the second end along the direction from the first end toward the second end; and a second cladding layer disposed on the core layer and the rib layer. The core layer and both of the slab and rib layers are optically coupled in a part in which the sectional are of the core and rib layers is the maximum.Type: GrantFiled: February 25, 2013Date of Patent: March 29, 2016Assignees: FUJITSU LIMITED, NEC CORPORATIONInventors: Nobuaki Hatori, Masashige Ishizaka, Takanori Shimizu
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Patent number: 9235000Abstract: An optical semiconductor device includes a silicon oxide layer configured to be formed on a substrate; an optical waveguide part configured to be formed on the silicon oxide layer; a cladding layer configured to be formed covering the optical waveguide part; and a semiconductor laser configured to be disposed on the substrate. Laser light emitted from the semiconductor laser enters the optical waveguide part. The optical waveguide part increases transmittance of light when the wavelength becomes greater within an oscillation wavelength range of the semiconductor laser.Type: GrantFiled: March 12, 2014Date of Patent: January 12, 2016Assignees: FUJITSU LIMITED, NEC CORPORATIONInventors: Nobuaki Hatori, Masashige Ishizaka, Takanori Shimizu
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Patent number: 9195001Abstract: The spot size converter includes a first cladding layer, a first core layer and a second core layer arranged side by side on the first cladding layer so as to extend from a first end which receives/outputs light along a direction from the first end toward a second end, a third core layer which is disposed on the first cladding layer between the first and second core layers, is a member different from the first and second core layers, and extends to the second end along the direction from the first end toward the second end, and a second cladding layer disposed on the first, second, and third core layers.Type: GrantFiled: December 27, 2012Date of Patent: November 24, 2015Assignees: FUJITSU LIMITED, NEC CORPORATIONInventors: Nobuaki Hatori, Masashige Ishizaka, Takanori Shimizu
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Patent number: 9151894Abstract: A light source circuit transmits light incident from a semiconductor laser source to a plurality of optical devices. At least one optical branch section is formed to branch one input-side optical waveguide at least into a first output-side optical waveguide terminal and a second output-side optical waveguide terminal. A light path length (L1) between the optical branch section and a next-stage optical branch section or the optical device is connected to the first output-side optical waveguide extending from the optical branch section and a light path length (L2) between the optical branch section and the next-stage optical branch section selected such that the absolute value of a difference between (L1) and (L2) is (¼+i/2) times (i is zero or a positive integer) the wavelength of the light transmitted through the light source circuit.Type: GrantFiled: February 27, 2013Date of Patent: October 6, 2015Assignees: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY, NEC CORPORATION, FUJITSU LIMITEDInventors: Makoto Okano, Masahiko Mori, Masashige Ishizaka, Takanori Shimizu, Nobuaki Hatori
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Publication number: 20150277044Abstract: An optical waveguide coupler includes a substrate and an optical waveguide of a multi-layer structure of a first clad layer/a first waveguide layer/a second clad layer, at least, on the end surface side of an optical input and output provided on the substrate, characterized in that the first waveguide layer has such a distribution of the refractive index that the refractive index is the highest at the center of the first waveguide layer in the multi-layer structure in the stacking direction, and the first waveguide layer has such a protrusion in a convex form that the center portion having the highest refractive index protrudes in a cross section that is perpendicular to the end surface of the optical input and output and perpendicular to the main surface of the substrate.Type: ApplicationFiled: March 19, 2015Publication date: October 1, 2015Applicants: FUJITSU LIMITED, NEC CorporationInventors: Nobuaki Hatori, Masashige Ishizaka, Takanori Shimizu
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Publication number: 20150277072Abstract: Light that returns through reflection from the optical connection portion between a semiconductor optical waveguide and an optically functional element is reduced through the use of a simplified structure in a semiconductor optical waveguide device. The device is provided with an anti-reflection diffraction grating having the period to prevent light that has been led through the semiconductor optical waveguide towards the portion connected to the optically functional element from being reflected in the direction from which the light has been led.Type: ApplicationFiled: March 20, 2015Publication date: October 1, 2015Applicants: FUJITSU LIMITED, NEC CorporationInventors: Nobuaki Hatori, Masashige Ishizaka, Takanori Shimizu
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Patent number: 9128240Abstract: The invention relates to a spot-size converter, a manufacturing method thereof, and an integrated optical circuit device, and ensures easier coupling to the optical fiber and higher accuracy in manufacturing the spot-size converter. A first core that is extended from a first end configured to input/output light toward a second end, and a second core that is formed by a plurality of cores, and formed at a position to be evanescent-coupled to the first core, and moreover extended along a direction from the first end toward the second end are provided, and, on the second core, a third core that has a taper unit and is formed at a position to be evanescent-coupled to the second core in a lamination direction is provided.Type: GrantFiled: March 14, 2014Date of Patent: September 8, 2015Assignees: FUJITSU LIMITED, NEC CorporationInventors: Nobuaki Hatori, Masashige Ishizaka, Takanori Shimizu
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Patent number: 9130352Abstract: An optical semiconductor device includes: a substrate of semiconductor; an array having a plurality of active regions arranged on the substrate so as to emit light to the same direction, the plurality of active regions being arranged more densely at ends of the array than in the center of the array in a direction crossing the light emitting direction; and electrodes which inject current to the plurality of active regions.Type: GrantFiled: March 15, 2013Date of Patent: September 8, 2015Assignee: NEC CORPORATIONInventors: Nobuaki Hatori, Masashige Ishizaka, Takanori Shimizu
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Publication number: 20150036964Abstract: A light source circuit transmits light incident from a semiconductor laser source to a plurality of optical devices. At least one optical branch section is formed to branch one input-side optical waveguide at least into a first output-side optical waveguide terminal and a second output-side optical waveguide terminal. A light path length (L1) between the optical branch section and a next-stage optical branch section or the optical device is connected to the first output-side optical waveguide extending from the optical branch section and a light path length (L2) between the optical branch section and the next-stage optical branch section selected such that the absolute value of a difference between (L1) and (L2) is (¼+i/2) times (i is zero or a positive integer) the wavelength of the light transmitted through the light source circuit.Type: ApplicationFiled: February 27, 2013Publication date: February 5, 2015Inventors: Makoto Okano, Masahiko Mori, Masashige Ishizaka, Takanori Shimizu, Nobuaki Hatori