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).

  • Publication number: 20230358928
    Abstract: An optical computing device includes a filter, through which light passes, and an optical diffraction element group that performs optical computing. The optical diffraction element group includes one or more optical diffraction elements having microcells, each of the microcells having an independently set thickness or a refractive index. After passing through the filter, the light first enters a first optical diffraction element among the one or more optical diffraction elements. The filter selectively transmits light in a direction that has an angle, with respect to an optical axis of the first optical diffraction element, that is less than or equal to a specific angle determined by the filter.
    Type: Application
    Filed: June 30, 2021
    Publication date: November 9, 2023
    Applicant: FUJIKURA LTD.
    Inventors: Hiroyuki Kusaka, Masahiro Kashiwagi, Yuichiro Kunai
  • Publication number: 20230359880
    Abstract: An optical computing device includes: an optical modulation element including cells with independently configurable amounts of modulation; and a reflector. The optical modulation element is configured with N (N is a natural number not less than 2)-computing regions A1, A2, . . . , AN. The computing region A1 performs optical computing by modulating and reflecting incident light. Each computing region Ai (i is a corresponding natural number not less than 2 and not more than N) other than the computing region A1 performs the optical computing by modulating and reflecting signal light that has been modulated and reflected by a computing region Ai?1 and then reflected by the reflector.
    Type: Application
    Filed: June 15, 2021
    Publication date: November 9, 2023
    Applicants: FUJIKURA LTD., FUJIKURA LTD.
    Inventors: Hiroyuki Kusaka, Masahiro Kashiwagi, Yuichiro Kunai
  • Publication number: 20230194887
    Abstract: An optical computing device includes: one or more light-diffraction elements each of which includes microcells, wherein each of the microcells has an individually set thickness or refractive index; and an optical signal input section that simultaneously inputs an optical signal and a delayed optical signal obtained by delaying the optical signal to the one or more light-diffraction elements.
    Type: Application
    Filed: January 27, 2022
    Publication date: June 22, 2023
    Applicant: Fujikura Ltd.
    Inventors: Hiroyuki Kusaka, Masahiro Kashiwagi
  • Publication number: 20230176268
    Abstract: An optical computing system includes: a light diffraction element divided into blocks and including cells having respective thicknesses or refractive indices set independently of each other, wherein each of the blocks includes: a first cell of the cells having a thickness or a refractive index such that first optical computing is carried out and, a second cell of the cells having a thickness or a refractive index such that second optical computing is carried out; a light-emitting device including light-emitting cells corresponding to each of the blocks, that generates signal light, and that emits the signal light to the light diffraction element; and a light-receiving device including light-receiving cells corresponding to each of the cells of the light diffraction element, and that detects the signal light from the light diffraction element.
    Type: Application
    Filed: August 18, 2021
    Publication date: June 8, 2023
    Applicant: Fujikura Ltd.
    Inventors: Hiroyuki Kusaka, Masahiro Kashiwagi
  • Publication number: 20230176267
    Abstract: An optical computing system includes: an intensity modulation device group including at least two intensity modulation devices, each of which includes modulation cells, wherein each of the modulation cells of each of the intensity modulation devices carries out intensity modulation with respect to carrier light in accordance with one of signals to generate a signal light beam, and each of the signals corresponds to each of the intensity modulation devices; and a light diffraction element including diffraction cells having respective thicknesses or refractive indices set independently of each other, wherein each of the diffraction cells receives the signal light beam from each of the modulation cells of each of the intensity modulation devices corresponding to each of the diffraction cells, and by causing signal light beams to have respective different optical path lengths to the light diffraction element, the signal light beams have respective different phases.
    Type: Application
    Filed: August 18, 2021
    Publication date: June 8, 2023
    Applicant: FUJIKURA LTD.
    Inventors: Hiroyuki Kusaka, Masahiro Kashiwagi
  • Publication number: 20220285903
    Abstract: An optical amplification apparatus includes a first amplification optical fiber, a second amplification optical fiber, a first pumping light source, and a second pumping light source. The first amplification optical fiber includes a first core and a first cladding layer. The first core is doped with an active element using a first active element doping concentration distribution. The first cladding layer is disposed out of the first core and has a refractive index lower than the refractive index of the first core. The second amplification optical fiber is connected to the first amplification optical fiber in a longitudinal direction of the first amplification optical fiber. The second amplification optical fiber includes a second core and a second cladding layer. The second core is doped with active element using a second active element doping concentration distribution that is different from the first active element doping concentration distribution.
    Type: Application
    Filed: September 2, 2020
    Publication date: September 8, 2022
    Applicant: FUJIKURA LTD.
    Inventors: Hiroyuki Kusaka, Masahiro Kashiwagi
  • Publication number: 20220269100
    Abstract: A light diffraction element, that has cells, includes first regions and second regions. Each of the cells comprises one of the first regions and one of the second regions. Each of the first regions has a thickness or a refractive index that is independently set. The second regions have a uniform thickness or a uniform refractive index. The first regions allow first polarized components of signal light to pass through. The second regions allow second polarized components of signal light to pass through. The second polarized components are different, in polarization direction, from the first polarized components. The light diffraction element performs optical computing by causing the first polarized components of signal light that have passed through the first regions to interfere with each other. The first polarized components of signal light output from the light diffraction element indicate information after the optical computing.
    Type: Application
    Filed: June 17, 2021
    Publication date: August 25, 2022
    Applicant: FUJIKURA LTD.
    Inventors: Hiroyuki Kusaka, Masahiro Kashiwagi
  • Publication number: 20220229461
    Abstract: An optical computing system includes: a light diffraction element group including n pieces of light diffraction elements, where n is a natural number of 2 or more. Each of the n pieces includes cells, each of which has a thickness or a refractive index that is independently set. Each of the cells is classified into a C1 cell or a C2 cell. The thickness or the refractive index of each of the C1 cells is set such that optical computing that is carried out by the light diffraction element group becomes an identity operation when the C2 cells are masked.
    Type: Application
    Filed: June 4, 2021
    Publication date: July 21, 2022
    Applicant: FUJIKURA LTD.
    Inventors: Hiroyuki Kusaka, Masahiro Kashiwagi
  • Patent number: 11316315
    Abstract: 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: Grant
    Filed: January 23, 2019
    Date of Patent: April 26, 2022
    Assignee: FUJIKURA LTD.
    Inventors: Hiroyuki Kusaka, Masahiro Kashiwagi
  • Publication number: 20210016351
    Abstract: An aspect of the present invention makes it easier to increase a temperature of metal powder to a temperature at which a powder bed (PB) is sintered or melted. An irradiation device (13) includes: a galvano scanner (13a) which irradiates at least part of a powder bed (PB) with laser light; and a wavelength converting element (WCE) provided in an optical path of the laser light. The wavelength converting element (WCE) converts laser light inputted into the wavelength converting element to laser light containing harmonic wave light (HL) which has a shorter wavelength than the laser light inputted into the wavelength converting element.
    Type: Application
    Filed: March 27, 2019
    Publication date: January 21, 2021
    Applicant: FUJIKURA LTD.
    Inventors: Hiroyuki Kusaka, Masahiro Kashiwagi
  • Publication number: 20210001428
    Abstract: The present invention causes residual stress, which may be generated in a metal shaped object (MO), to be small. A metal shaping device includes an irradiation device (13, 13A). The irradiation device (13, 13A), which is configured to irradiate a powder bed (PB) containing a metal powder with laser light (L), is able to be switched between (i) a focused state in which a beam spot diameter (D1) of laser light (L) on a surface of the powder bed (PB) has a first value and (ii) a defocused state in which the beam spot diameter (D2) of the laser light (L) on the surface of the powder bed (PB) has a second value which is larger than the first value.
    Type: Application
    Filed: March 28, 2019
    Publication date: January 7, 2021
    Applicant: FUJIKURA LTD.
    Inventors: Hiroyuki Kusaka, Masahiro Kashiwagi
  • Publication number: 20200406359
    Abstract: The present invention causes residual stress, which may be generated in a metal shaped object (MO), to be small. An irradiation device (13) includes: a first irradiating section (13A) configured to irradiate, with first laser light (LA), a first region (DA) of a powder bed (PB); and second irradiating section (13B) configured to irradiate, with second laser light (LB), a second region (DB) of the powder bed (PB). The second irradiating section (13B) irradiates the second region (DB) with the second laser light (LB) so that an energy density of the second laser light (LB), with which the second region (DB) is irradiated, is lower than an energy density of the first laser light (LA), with which the first region (DA) is irradiated.
    Type: Application
    Filed: March 25, 2019
    Publication date: December 31, 2020
    Applicant: FUJIKURA LTD.
    Inventors: Hiroyuki Kusaka, Masahiro Kashiwagi
  • Publication number: 20200398340
    Abstract: 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: Application
    Filed: March 25, 2019
    Publication date: December 24, 2020
    Applicant: FUJIKURA LTD.
    Inventors: Hiroyuki Kusaka, Masahiro Kashiwagi
  • Publication number: 20200358243
    Abstract: 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: Application
    Filed: January 23, 2019
    Publication date: November 12, 2020
    Applicant: FUJIKURA LTD.
    Inventors: Hiroyuki Kusaka, Masahiro Kashiwagi
  • Patent number: 9857533
    Abstract: 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: Grant
    Filed: March 6, 2017
    Date of Patent: January 2, 2018
    Assignee: FUJIKURA LTD.
    Inventors: Hiroyuki Kusaka, Ryokichi Matsumoto, Kazuhiro Goi, Kensuke Ogawa
  • Patent number: 9857534
    Abstract: 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: Grant
    Filed: August 13, 2013
    Date of Patent: January 2, 2018
    Assignee: FUJIKURA LTD.
    Inventors: Hiroyuki Kusaka, Kensuke Ogawa, Kazuhiro Goi
  • Patent number: 9817294
    Abstract: 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: Grant
    Filed: June 24, 2015
    Date of Patent: November 14, 2017
    Assignee: FUJIKURA LTD.
    Inventors: Kazuhiro Goi, Hiroki Ishihara, Kensuke Ogawa, Kenji Oda, Hiroyuki Kusaka, Ryokichi Matsumoto, Hitoshi Uemura
  • Publication number: 20170176681
    Abstract: 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: Application
    Filed: March 6, 2017
    Publication date: June 22, 2017
    Applicant: FUJIKURA LTD.
    Inventors: Hiroyuki Kusaka, Ryokichi Matsumoto, Kazuhiro Goi, Kensuke Ogawa
  • Patent number: 9557482
    Abstract: 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: Grant
    Filed: December 21, 2015
    Date of Patent: January 31, 2017
    Assignee: FUJIKURA LTD.
    Inventors: Akira Oka, Kazuhiro Goi, Kensuke Ogawa, Hiroyuki Kusaka
  • Patent number: 9529151
    Abstract: 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: Grant
    Filed: December 21, 2015
    Date of Patent: December 27, 2016
    Assignee: FUJIKURA LTD.
    Inventors: Kazuhiro Goi, Akira Oka, Hiroyuki Kusaka, Kensuke Ogawa