Patents by Inventor Hiroyuki Kusaka
Hiroyuki Kusaka 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: 20200398340Abstract: The present invention keeps a residual stress small which may occur in a metal shaped object (MO) while keeping a time short which is to be taken for carrying out main heating and preheating. An irradiation device (13) carries out a first heating step of heating a powder bed (PB) with laser light (LL) so that a temperature (T) of the powder bed (PB) is higher than 0.8 times as high as a melting point (Tm) of the metal powder and a second heating step of heating the powder bed (PB) with cladding light (CL) before or after the first heating step so that a temperature (T) of the powder bed (PB) is 0.5 times to 0.8 times as high as the melting point (Tm) of the metal powder.Type: ApplicationFiled: March 25, 2019Publication date: December 24, 2020Applicant: FUJIKURA LTD.Inventors: Hiroyuki Kusaka, Masahiro Kashiwagi
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Publication number: 20200358243Abstract: A fiber laser apparatus includes a pump light source that emits pump light; a pump delivery fiber that guides the pump light; an amplifying optical fiber that is optically coupled to the pump delivery fiber and guides laser light; and a filter element that causes more loss of light of a wavelength range that includes a peak wavelength of at least one of Stokes light and anti-Stokes light than the laser light. The Stokes light and anti-Stokes light result from four-wave mixing involving a plurality of guide modes in a multi-mode fiber that guides the laser light. The filter element is disposed between: the pump delivery fiber and the amplifying optical fiber, the amplifying optical fiber and the multi-mode fiber, or at the multi-mode fiber.Type: ApplicationFiled: January 23, 2019Publication date: November 12, 2020Applicant: FUJIKURA LTD.Inventors: Hiroyuki Kusaka, Masahiro Kashiwagi
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Patent number: 9857533Abstract: An optical waveguide element includes a core and a cladding that is made of SiO2. When ng_i_TE is a group refractive index of a TE0 polarized wave in the i-th waveguide counted from a light incidence plane of the core and ng_i_TM is a group refractive index of a TM0 polarized wave in the i-th waveguide, the length L—i[m] of the i-th waveguide satisfies a predetermined relation.Type: GrantFiled: March 6, 2017Date of Patent: January 2, 2018Assignee: FUJIKURA LTD.Inventors: Hiroyuki Kusaka, Ryokichi Matsumoto, Kazuhiro Goi, Kensuke Ogawa
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Patent number: 9857534Abstract: An optical waveguide device includes: a mode splitter including a main waveguide in which lights can be propagated in at least two propagation modes with different propagation orders and a subsidiary waveguide which includes a coupling section disposed in parallel with the main waveguide at a certain distance away from the main waveguide so as to constitute a directional coupler and is capable of splitting at least one propagation mode out of the two or more propagation modes from the main waveguide. Also, ncore/ncladding which is a refractive index ratio between a core and a cladding which constitute the main waveguide and the subsidiary waveguide is in a range of 101% to 250%.Type: GrantFiled: August 13, 2013Date of Patent: January 2, 2018Assignee: FUJIKURA LTD.Inventors: Hiroyuki Kusaka, Kensuke Ogawa, Kazuhiro Goi
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Patent number: 9817294Abstract: An optical modulation device configured of a planar optical waveguide, includes: a light incidence unit which allows light to be incident on the planar optical waveguide; a Mach-Zehnder interferometer which includes a first optical splitter section branching the light incident on the light incidence unit, two arm portions guiding the light branched by the first optical splitter section, a phase modulation unit linearly disposed on each of the two arm portions, and a first optical coupler section combining the light guided from the two arm portions; a light launching unit which launches the light combined by the first optical coupler section from the planar optical waveguide; and a traveling-wave electrode which includes an input unit and an output unit, and applies a voltage to the phase modulation unit.Type: GrantFiled: June 24, 2015Date of Patent: November 14, 2017Assignee: FUJIKURA LTD.Inventors: Kazuhiro Goi, Hiroki Ishihara, Kensuke Ogawa, Kenji Oda, Hiroyuki Kusaka, Ryokichi Matsumoto, Hitoshi Uemura
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Publication number: 20170176681Abstract: An optical waveguide element includes a core and a cladding that is made of SiO2. When ng_i_TE is a group refractive index of a TE0 polarized wave in the i-th waveguide counted from a light incidence plane of the core and ng_i_TM is a group refractive index of a TM0 polarized wave in the i-th waveguide, the length L_i[m] of the i-th waveguide satisfies a predetermined relation.Type: ApplicationFiled: March 6, 2017Publication date: June 22, 2017Applicant: FUJIKURA LTD.Inventors: Hiroyuki Kusaka, Ryokichi Matsumoto, Kazuhiro Goi, Kensuke Ogawa
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Patent number: 9557482Abstract: A high-order polarization conversion device configured of a planar optical waveguide, includes: a substrate; a lower clad disposed on the substrate; a core including a lower core and an upper core, the lower core being disposed on the lower clad and having a fixed height in a rectangular sectional shape, the upper core being formed of the same material as the lower core and having a fixed height in a rectangular sectional shape that is disposed continuously on the lower core; and an upper clad that is disposed on the core and the lower clad and is formed of the same material as the lower clad. The high-order polarization conversion device performs high-order polarization conversion between TE1 of the start portion and TM0 of the end portion.Type: GrantFiled: December 21, 2015Date of Patent: January 31, 2017Assignee: FUJIKURA LTD.Inventors: Akira Oka, Kazuhiro Goi, Kensuke Ogawa, Hiroyuki Kusaka
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Patent number: 9529151Abstract: A polarization conversion element is disclosed in which an optical waveguide formed on a substrate sequentially includes a first waveguide portion, a polarization rotation portion, and a second waveguide portion, an effective refractive index of a TE mode having the highest effective refractive index in an eigen mode of waveguide light on a sectional surface of the first waveguide portion is higher than an effective refractive index of a TM mode having the highest effective refractive index, an effective refractive index of the TM mode having the highest effective refractive index on a sectional surface of the second waveguide portion is higher than an effective refractive index of the TE mode having the highest effective refractive index, and heights of waveguide structures (for example, cores) of the first waveguide portion and the second waveguide portion are equal to each other.Type: GrantFiled: December 21, 2015Date of Patent: December 27, 2016Assignee: FUJIKURA LTD.Inventors: Kazuhiro Goi, Akira Oka, Hiroyuki Kusaka, Kensuke Ogawa
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Patent number: 9448425Abstract: An optical waveguide element includes: a rib waveguide and a pair of slab portions including a first slab portion and a second slab portion connected to both sides of the rib portion so as to sandwich the rib portion. The rib portion has a cross-sectional dimension which allows the propagation of a fundamental mode and a higher order mode in a predetermined single polarization state, and has a first P-type semiconductor and a first N-type semiconductor forming a PN junction, the first slab portion has a second P-type semiconductor and a P-type conductor connected to each other, the second P-type semiconductor is connected to the first P-type semiconductor of the rib portion, the second slab portion has a second N-type semiconductor and an N-type conductor connected to each other, and the second N-type semiconductor is connected to the first N-type semiconductor of the rib portion.Type: GrantFiled: June 24, 2015Date of Patent: September 20, 2016Assignee: FUJIKURA LTD.Inventors: Kensuke Ogawa, Kazuhiro Goi, Hiroyuki Kusaka
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Publication number: 20160178842Abstract: A polarization conversion element is disclosed in which an optical waveguide formed on a substrate sequentially includes a first waveguide portion, a polarization rotation portion, and a second waveguide portion, an effective refractive index of a TE mode having the highest effective refractive index in an eigen mode of waveguide light on a sectional surface of the first waveguide portion is higher than an effective refractive index of a TM mode having the highest effective refractive index, an effective refractive index of the TM mode having the highest effective refractive index on a sectional surface of the second waveguide portion is higher than an effective refractive index of the TE mode having the highest effective refractive index, and heights of waveguide structures (for example, cores) of the first waveguide portion and the second waveguide portion are equal to each other.Type: ApplicationFiled: December 21, 2015Publication date: June 23, 2016Applicant: FUJIKURA LTD.Inventors: Kazuhiro GOI, Akira OKA, Hiroyuki KUSAKA, Kensuke OGAWA
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Publication number: 20160178841Abstract: A high-order polarization conversion device configured of a planar optical waveguide, includes: a substrate; a lower clad disposed on the substrate; a core including a lower core and an upper core, the lower core being disposed on the lower clad and having a fixed height in a rectangular sectional shape, the upper core being formed of the same material as the lower core and having a fixed height in a rectangular sectional shape that is disposed continuously on the lower core; and an upper clad that is disposed on the core and the lower clad and is formed of the same material as the lower clad. The high-order polarization conversion device performs high-order polarization conversion between TE1 of the start portion and TM0 of the end portion.Type: ApplicationFiled: December 21, 2015Publication date: June 23, 2016Applicant: Fujikura Ltd.Inventors: Akira OKA, Kazuhiro GOI, Kensuke OGAWA, Hiroyuki KUSAKA
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Patent number: 9335472Abstract: A planar optical waveguide device, includes: two input portions that are waveguides that have the same width, are parallel to each other, and have rectangular cross-sections; a wide portion that is a linear waveguide and is connected after the two input portions; a tapered portion that is connected after the wide portion and that is a multi-mode waveguide which has a tapered shape having a width decreasing gradually and through which at least TE1 propagates; and an output portion that is connected after the tapered portion and that is a multi-mode waveguide which has a rectangular cross-section and through which at least TE1 propagates. The planar optical waveguide device forms a high-order mode conversion combining element that outputs the TE0, which is input to the two input portions, as the TE1 from the output portion.Type: GrantFiled: October 8, 2014Date of Patent: May 10, 2016Assignee: FUJIKURA LTD.Inventors: Akira Oka, Kensuke Ogawa, Kazuhiro Goi, Hiroyuki Kusaka
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Publication number: 20150293427Abstract: An optical modulation device configured of a planar optical waveguide, includes: a light incidence unit which allows light to be incident on the planar optical waveguide; a Mach-Zehnder interferometer which includes a first optical splitter section branching the light incident on the light incidence unit, two arm portions guiding the light branched by the first optical splitter section, a phase modulation unit linearly disposed on each of the two arm portions, and a first optical coupler section combining the light guided from the two arm portions; a light launching unit which launches the light combined by the first optical coupler section from the planar optical waveguide; and a traveling-wave electrode which includes an input unit and an output unit, and applies a voltage to the phase modulation unit.Type: ApplicationFiled: June 24, 2015Publication date: October 15, 2015Applicant: FUJIKURA LTD.Inventors: Kazuhiro GOI, Hiroki ISHIHARA, Kensuke OGAWA, Kenji ODA, Hiroyuki KUSAKA, Ryokichi MATSUMOTO, Hitoshi UEMURA
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Publication number: 20150293384Abstract: An optical waveguide element includes: a rib waveguide and a pair of slab portions including a first slab portion and a second slab portion connected to both sides of the rib portion so as to sandwich the rib portion. The rib portion has a cross-sectional dimension which allows the propagation of a fundamental mode and a higher order mode in a predetermined single polarization state, and has a first P-type semiconductor and a first N-type semiconductor forming a PN junction, the first slab portion has a second P-type semiconductor and a P-type conductor connected to each other, the second P-type semiconductor is connected to the first P-type semiconductor of the rib portion, the second slab portion has a second N-type semiconductor and an N-type conductor connected to each other, and the second N-type semiconductor is connected to the first N-type semiconductor of the rib portion.Type: ApplicationFiled: June 24, 2015Publication date: October 15, 2015Applicant: FUJIKURA LTD.Inventors: Kensuke OGAWA, Kazuhiro GOI, Hiroyuki KUSAKA
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Publication number: 20150241633Abstract: An optical waveguide device includes: a mode splitter including a main waveguide in which lights can be propagated in at least two propagation modes with different propagation orders and a subsidiary waveguide which includes a coupling section disposed in parallel with the main waveguide at a certain distance away from the main waveguide so as to constitute a directional coupler and is capable of splitting at least one propagation mode out of the two or more propagation modes from the main waveguide. Also, ncore/ncladding which is a refractive index ratio between a core and a cladding which constitute the main waveguide and the subsidiary waveguide is in a range of 101% to 250%.Type: ApplicationFiled: August 13, 2013Publication date: August 27, 2015Applicant: FUJIKURA LTD.Inventors: Hiroyuki Kusaka, Kensuke Ogawa, Kazuhiro Goi
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Publication number: 20150104128Abstract: A planar optical waveguide device, includes: two input portions that are waveguides that have the same width, are parallel to each other, and have rectangular cross-sections; a wide portion that is a linear waveguide and is connected after the two input portions; a tapered portion that is connected after the wide portion and that is a multi-mode waveguide which has a tapered shape having a width decreasing gradually and through which at least TE1 propagates; and an output portion that is connected after the tapered portion and that is a multi-mode waveguide which has a rectangular cross-section and through which at least TE1 propagates. The planar optical waveguide device forms a high-order mode conversion combining element that outputs the TE0, which is input to the two input portions, as the TE1 from the output portion.Type: ApplicationFiled: October 8, 2014Publication date: April 16, 2015Applicant: FUJIKURA LTD.Inventors: Akira OKA, Kensuke OGAWA, Kazuhiro GOI, Hiroyuki KUSAKA
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Patent number: 9008476Abstract: A polarization conversion device includes: a directional coupler that includes an input side optical waveguide and an output side optical waveguide which are disposed in parallel to each other and each of which has a core. Assuming that a direction in which the input side optical waveguide and the output side optical waveguide face each other is a width direction and a direction perpendicular to the width direction is a height direction in a cross section perpendicular to a longitudinal direction of each of the input side optical waveguide and the output side optical waveguide, and the directional coupler is configured to couple first light guided through the input side optical waveguide to second light guided through the output side optical waveguide, the polarization direction of the second light is perpendicular to that of the first light.Type: GrantFiled: June 25, 2014Date of Patent: April 14, 2015Assignee: Fujikura Ltd.Inventors: Akira Oka, Kazuhiro Goi, Kensuke Ogawa, Hiroyuki Kusaka
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Publication number: 20150003782Abstract: A polarization conversion device includes: a directional coupler that includes an input side optical waveguide and an output side optical waveguide which are disposed in parallel to each other and each of which has a core Assuming that a direction in which the input side optical waveguide and the output side optical waveguide face each other is a width direction and a direction perpendicular to the width direction is a height direction in a cross section perpendicular to a longitudinal direction of each of the input side optical waveguide and the output side optical waveguide, and the directional coupler is configured to couple first light guided through the input side optical waveguide to second light guided through the output side optical waveguide, the polarization direction of the second light is perpendicular to that of the first light.Type: ApplicationFiled: June 25, 2014Publication date: January 1, 2015Applicant: FUJIKURA LTD.Inventors: Akira OKA, Kazuhiro GOI, Kensuke OGAWA, Hiroyuki KUSAKA
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Publication number: 20140216340Abstract: Disclosed is a method of producing an insulated electric wire, in which a primary coating layer including at least an enamel-baking layer is formed on a metallic conductor to form a primary coated electric wire, and a secondary coating layer is extrusion-formed on the primary coating layer of the primary coated electric wire. The method includes an electric wire pre-heating process where a surface of the primary coating layer is pre-heated using an electric wire pre-heating unit, and a resin extrusion process where a secondary coating layer is extrusion-formed on the pre-heated primary coating layer using a resin extrusion unit. Further disclosed is an apparatus for producing an insulated electric wire.Type: ApplicationFiled: April 10, 2014Publication date: August 7, 2014Applicant: Furukawa Electric Co., Ltd.Inventors: Hiroyuki KUSAKA, Koji KUROMIYA, Satoshi SAITO, Takashi SHIGEMATSU, Akihiro MURAKAMI, Shinji ICHIKAWA, Haruo SAKUMA, Shingo NISHIJIMA
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Patent number: 8790747Abstract: Disclosed is a method of producing an insulated electric wire, in which a primary coating layer including at least an enamel-baking layer is formed on a metallic conductor to form a primary coated electric wire, and a secondary coating layer is extrusion-formed on the primary coating layer of the primary coated electric wire. The method includes an electric wire pre-heating process where a surface of the primary coating layer is pre-heated using an electric wire pre-heating unit, and a resin extrusion process where a secondary coating layer is extrusion-formed on the pre-heated primary coating layer using a resin extrusion unit. Further disclosed is an apparatus for producing an insulated electric wire.Type: GrantFiled: March 28, 2008Date of Patent: July 29, 2014Assignee: Furukawa Electric Co., Ltd.Inventors: Hiroyuki Kusaka, Koji Kuromiya, Satoshi Saito, Takashi Shigematsu, Akihiro Murakami, Shinji Ichikawa, Haruo Sakuma, Shingo Nishijima