Patents by Inventor Hisato Uetsuka

Hisato Uetsuka 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: 20180143508
    Abstract: A conventional optical switching engine has difficulty in producing a universal multiport switching engine being capable of (i) programmatically changing regions to be switched, (ii) generating no wavelength dependent loss, (iii) having a small Walk-off, and (iv) being usable for small to large light beams. Produced is a light beam deflecting element in which a polarization grating is fitted in parallel on an N×M transmissive birefringence modulator formed such that a transmissive variable half-wavelength liquid crystal plate is divided into rectangular extreme small pixels, and many N and M pixels thus obtained are respectively arranged in X and Y axes directions in a matrix form, the polarization grating being a grating in which a period ? changes in an X? axis direction (direction to which a birefringence axis rotates) in accordance with a wavelength width of light.
    Type: Application
    Filed: April 18, 2016
    Publication date: May 24, 2018
    Inventors: Hisato Uetsuka, Shu Namiki, Hitoshi Kawashima, Kazuhiro Ikeda
  • Publication number: 20130272650
    Abstract: A wavelength cross connect device includes an input demultiplexing optical system for demultiplexing light input from a plurality of input ports into respective wavelengths, a wavelength switching optical system for switching and outputting the lights of respective wavelengths input from the input demultiplexing optical system to respective desired ports, and an output multiplexing optical system for multiplexing the lights of respective wavelengths input from the wavelength switching optical system per port. The input demultiplexing optical system and the output multiplexing optical system includes a lens system that has a function of focusing lights independently in vertical and widthwise directions.
    Type: Application
    Filed: March 25, 2013
    Publication date: October 17, 2013
    Applicants: National Institute of Advanced Industrial Science and Technology, KEIO UNIVERSITY, HITACHI CABLE, LTD.
    Inventors: Hiroshi Ishikawa, Toshifumi Hasama, Hitoshi Kawashima, Masahiko Mori, Hisato Uetsuka, Akihito Hongo, Hiroyuki Tsuda, Keisuke Sorimoto, Nazirul Afham bin Idris
  • Patent number: 8503836
    Abstract: To provide a waveguide type wavelength domain optical switch which makes it possible to use a cheap lens, makes it possible to correct aberration of the demultiplexed wavelengths produced in a plurality of waveguide type demultiplexing circuits, a wavelength domain optical switch is provided with: an integrated element formed by laminating three or more waveguide type demultiplexing circuits; a first lens for collecting light emitted from the integrated element; a polarization separation element for separating light emitted from the first lens into X polarization and Y polarization and emitting the X polarization and the Y polarization at different angles; a second lens for collecting the X polarization and the Y polarization; a first reflective optical phase modulator for reflecting the collected X polarization and Y polarization at any angles; a ½-wavelength plate disposed between the second lens and the first reflective optical phase modulator in order to make polarization directions of the X polarization
    Type: Grant
    Filed: January 26, 2011
    Date of Patent: August 6, 2013
    Assignees: National Institute of Advanced Industrial Science and Technology, Hitachi Cable, Ltd, Keio University
    Inventors: Hiroshi Ishikawa, Toshifumi Hasama, Hitoshi Kawashima, Kenji Kintaka, Masahiko Mori, Hisato Uetsuka, Hiroyuki Tsuda, Keisuke Sorimoto
  • Patent number: 8229258
    Abstract: An optical waveguide-type wavelength domain switch includes a waveguide-type multi/demultiplexing device laminate comprising three or more laminated waveguide-type multi/demultiplexing devices, a lens system positioned on a demultiplex side of the waveguide-type multi/demultiplexing device laminate, and a reflective optical phase-modulating cell positioned on an opposite side of the waveguide-type multi/demultiplexing device laminate to the lens system.
    Type: Grant
    Filed: September 16, 2009
    Date of Patent: July 24, 2012
    Assignees: National Institute of Advanced Industrial Science and Technology, Hitachi Cable, Ltd., Keio University
    Inventors: Hiroshi Ishikawa, Toshifumi Hasama, Hitoshi Kawashima, Kenji Kintaka, Masahiko Mori, Hisato Uetsuka, Hiroyuki Tsuda, Keisuke Sorimoto
  • Publication number: 20110182545
    Abstract: To provide a waveguide type wavelength domain optical switch which makes it possible to use a cheap lens, makes it possible to correct aberration of the demultiplexed wavelengths produced in a plurality of waveguide type demultiplexing circuits, a wavelength domain optical switch is provided with: an integrated element formed by laminating three or more waveguide type demultiplexing circuits; a first lens for collecting light emitted from the integrated element; a polarization separation element for separating light emitted from the first lens into X polarization and Y polarization and emitting the X polarization and the Y polarization at different angles; a second lens for collecting the X polarization and the Y polarization; a first reflective optical phase modulator for reflecting the collected X polarization and Y polarization at any angles; a ½-wavelength plate disposed between the second lens and the first reflective optical phase modulator in order to make polarization directions of the X polarization
    Type: Application
    Filed: January 26, 2011
    Publication date: July 28, 2011
    Applicants: National Institute of Advanced Industrial Science and Technology, Hitachi Cable, Ltd., Keio University
    Inventors: Hiroshi Ishikawa, Toshifumi Hasama, Hitoshi Kawashima, Kenji Kintaka, Masahiko Mori, Hisato Uetsuka, Hiroyuki Tsuda, Keisuke Sorimoto
  • Publication number: 20100067900
    Abstract: An optical waveguide-type wavelength domain switch includes a waveguide-type multi/demultiplexing device laminate comprising three or more laminated waveguide-type multi/demultiplexing devices, a lens system positioned on a demultiplex side of the waveguide-type multi/demultiplexing device laminate, and a reflective optical phase-modulating cell positioned on an opposite side of the waveguide-type multi/demultiplexing device laminate to the lens system.
    Type: Application
    Filed: September 16, 2009
    Publication date: March 18, 2010
    Applicants: National Institute of Advanced Industrial Science and Technology, HITACHI CABLE, LTD., KEIO UNIVERSITY
    Inventors: Hiroshi Ishikawa, Toshifumi Hasama, Hitoshi Kawashima, Kenji Kintaka, Masahiko Mori, Hisato Uetsuka, Hiroyuki Tsuda, Keisuke Sorimoto
  • Patent number: 7567736
    Abstract: A waveguide type wavelength domain optical switch includes an input/output port including at least three waveguide spectrometers stacked in thickness direction, a first lens for collecting light outputted from an input port of the input/output port in one axis direction, a second lens for collecting light outputted from the first lens in a direction orthogonal to the collecting direction of the first lens, and an optical phase modulation cell for reflecting light outputted from the second lens through the second lens and the first lens to an output port of the input/output port. Alternatively, the input/output port may include at least two waveguide spectrometers and a waveguide optical coupler circuit stacked in thickness direction.
    Type: Grant
    Filed: May 28, 2008
    Date of Patent: July 28, 2009
    Assignees: National Institute of Advanced Industrial Science and Technology, Hitachi Cable, Ltd.
    Inventors: Hiroshi Ishikawa, Toshifumi Hasama, Masahiko Mori, Hisato Uetsuka
  • Patent number: 7496256
    Abstract: A diffraction grating of the present invention includes a first block (101) and a second block (102). The first block (101) is made up of a plurality of input waveguides (103), a slab waveguide (104), a delay waveguide array (105) and narrow grooves (106): each of which being filled with resin. The second block (102) is made up of a plurality of input waveguides (107), a slab waveguide (108) and a plurality of output waveguides (109). Since a circuit is cut off at the ends of the arrayed waveguides, a relative phase can easily be measured. The resin has undergone a refractive-index adjustment and compensates a phase error.
    Type: Grant
    Filed: August 2, 2007
    Date of Patent: February 24, 2009
    Assignees: KEIO University, Hitachi Cable, Ltd.
    Inventors: Hiroyuki Tsuda, Hiroshi Ishikawa, Hisato Uetsuka
  • Publication number: 20080298738
    Abstract: A waveguide type wavelength domain optical switch includes an input/output port including at least three waveguide spectrometers stacked in thickness direction, a first lens for collecting light outputted from an input port of the input/output port in one axis direction, a second lens for collecting light outputted from the first lens in a direction orthogonal to the collecting direction of the first lens, and an optical phase modulation cell for reflecting light outputted from the second lens through the second lens and the first lens to an output port of the input/output port.
    Type: Application
    Filed: May 28, 2008
    Publication date: December 4, 2008
    Applicants: National Institute of Advanced Industrial Science and Technology, HITACHI CABLE, LTD.
    Inventors: Hiroshi Ishikawa, Toshifumi Hasama, Masahiko Mori, Hisato Uetsuka
  • Publication number: 20080056643
    Abstract: A diffraction grating of the present invention includes a first block (101) and a second block (102). The first block (101) is made up of a plurality of input waveguides (103), a slab waveguide (104), a delay waveguide array (105) and narrow grooves (106): each of which being filled with resin. The second block (102) is made up of a plurality of input waveguides (107), a slab waveguide (108) and a plurality of output waveguides (109). Since a circuit is cut off at the ends of the arrayed waveguides, a relative phase can easily be measured. The resin has undergone a refractive-index adjustment and compensates a phase error.
    Type: Application
    Filed: August 2, 2007
    Publication date: March 6, 2008
    Applicants: KEIO University, Hitachi Cable, Ltd.
    Inventors: Hiroyuki Tsuda, Hiroshi Ishikawa, Hisato Uetsuka
  • Patent number: 6980707
    Abstract: A waveguide type variable optical attenuator has: a substrate; two optical circuits that are in parallel formed on the substrate, each of the optical circuits including two couplers that conduct the branching and coupling of light and are connected to the input port and output port of light and two waveguides through which the two couplers are connected; a polarization maintaining fiber one end of which is connected to the output port of one of the two optical circuits and the other end of which is connected to the input port of the other of the two optical circuits while being twisted 90°; and a heater that is provided around neighboring waveguides of the two optical circuits such that the neighboring waveguides share heat to be generated by the heater.
    Type: Grant
    Filed: September 4, 2003
    Date of Patent: December 27, 2005
    Assignee: Hitachi Cable, Ltd.
    Inventors: Takafumi Chiba, Satoshi Takasugi, Tetsu Hasegawa, Hisato Uetsuka
  • Patent number: 6947631
    Abstract: A waveguide-type optical multiplexer/demultiplexer with low crosstalk characteristics and reduced wavelength dispersion is provided. A waveguide-type optical multiplexer/demultiplexer comprising, first, second and third optical multiplexer/demultiplexer circuits connected in multistage, each multiplexer/demultiplexer circuit has four input-output ports, third input-output port of first optical multiplexer/demultiplexer circuit is connected to third input-output port of second optical multiplexer/demultiplexer circuit, and fourth input-output port of first optical multiplexer/demultiplexer circuit is connected to fourth input-output port of third optical multiplexer/demultiplexer circuit, when wavelength division multiplex signals having wavelength ?1, ?2, ?3, ?4, ?5, ?6 . . . are input through first input-output port of first optical multiplexer/demultiplexer circuit, multiplex signals of odd wavelength ?1, ?3, ?5 . . .
    Type: Grant
    Filed: November 8, 2002
    Date of Patent: September 20, 2005
    Assignee: Hitachi Cable, Ltd.
    Inventors: Hideaki Arai, Takafumi Chiba, Hisato Uetsuka, Masahiro Hikage
  • Patent number: 6724954
    Abstract: In an optical multiplexer/demultiplexer comprising optical multiplexer/demultiplexer circuits connected in multistage, the optical multiplexer/demultiplexer circuits each have two input ports and two output ports, an optical path, through which input optical signals with predetermined wavelengths are output after multiplexing and demultiplexing, varies depending upon the input port; the optical paths in each of the optical multiplexer/demultiplexer circuits have mutually opposite wavelength dispersion characteristics, and one of the optical paths in a first optical multiplexer/demultiplexer circuit is connected to one of the optical paths, in a second optical multiplexer/demultiplexer circuit, having wavelength dispersion characteristics opposite to the optical path in the first optical multiplexer/demultiplexer circuit.
    Type: Grant
    Filed: March 2, 2001
    Date of Patent: April 20, 2004
    Assignee: Hitachi Cable, Inc.
    Inventors: Hideaki Arai, Takafumi Chiba, Hisato Uetsuka
  • Publication number: 20040047583
    Abstract: A waveguide type variable optical attenuator has: a substrate; two optical circuits that are in parallel formed on the substrate, each of the optical circuits including two couplers that conduct the branching and coupling of light and are connected to the input port and output port of light and two waveguides through which the two couplers are connected; a polarization maintaining fiber one end of which is connected to the output port of one of the two optical circuits and the other end of which is connected to the input port of the other of the two optical circuits while being twisted 90°; and a heater that is provided around neighboring waveguides of the two optical circuits such that the neighboring waveguides share heat to be generated by the heater.
    Type: Application
    Filed: September 4, 2003
    Publication date: March 11, 2004
    Applicant: Hitachi Cable, Ltd.
    Inventors: Takafumi Chiba, Satoshi Takasugi, Tetsu Hasegawa, Hisato Uetsuka
  • Patent number: 6668107
    Abstract: An optical switching apparatus and a method of efficiently switching optical signals are disclosed. Optical insertion loss may be reduced in a planar lightwave circuit by determining an optimal spacing between perturbations including using passive perturbations, having a three dimensional refractive index distribution, in an array of waveguides, or by adjusting parameters of existing perturbations e.g. their spacing. The perturbation and each waveguide have different three dimensional refractive index distributions. The perturbation may be positioned anywhere in the array of waveguides. The perturbation may be a trench, a region of refractive index different from that in each waveguide, a broken waveguide core, or a modification of the topography of the array of waveguides. In one embodiment, the perturbation is a periodic or quasiperiodic perturbation.
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: December 23, 2003
    Assignees: Agilent Technologies, Inc., Hitachi Cable, Ltd. of Japan
    Inventors: Marshall Thomas DePue, Shalini Venkatesh, Hisato Uetsuka, Hiroaki Okano
  • Patent number: 6631223
    Abstract: In the optical multiplexer/demultiplexer according to the invention, an MMI (multi mode interference) coupler having a percentage coupling of about 50% is used as first and second optical couplers, and a directional coupler having a percentage coupling of less than 10% is used as third and fourth optical couplers. By virtue of this constitution, the optical multiplexer/demultiplexer according to the invention has a small dependency upon wavelength and can be used in a wide waveband, is less susceptible to a preparation error, and, at the same time, has good wavelength flatness in passband and a wide rejection band.
    Type: Grant
    Filed: February 15, 2001
    Date of Patent: October 7, 2003
    Assignee: Hitachi Cable, Ltd.
    Inventors: Hideaki Arai, Takafumi Chiba, Hisato Uetsuka
  • Publication number: 20030123778
    Abstract: An optical switching apparatus and a method of efficiently switching optical signals are disclosed. Optical insertion loss may be reduced in a planar lightwave circuit by determining an optimal spacing between perturbations including using passive perturbations, having a three dimensional refractive index distribution, in an array of waveguides, or by adjusting parameters of existing perturbations e.g. their spacing. The perturbation and each waveguide have different three dimensional refractive index distributions. The perturbation may be positioned anywhere in the array of waveguides. The perturbation may be a trench, a region of refractive index different from that in each waveguide, a broken waveguide core, or a modification of the topography of the array of waveguides. In one embodiment, the perturbation is a periodic or quasiperiodic perturbation.
    Type: Application
    Filed: December 21, 2001
    Publication date: July 3, 2003
    Inventors: Marshall Thomas DePue, Shalini Venkatesh, Hisato Uetsuka, Hiroaki Okano
  • Publication number: 20030091071
    Abstract: A waveguide-type optical multiplexer/demultiplexer with low crosstalk characteristics and reduced wavelength dispersion is provided. A waveguide-type optical multiplexer/demultiplexer comprising, first, second and third optical multiplexer/demultiplexer circuits connected in multistage, each multiplexer/demultiplexer circuit has four input-outpu ports, third input-output port of first optical multiplexer/demultiplexer circuit is connected to third input-output port of second optical multiplexer/demultiplexer circuit, and fourth input-output port of first optical multiplexer/demultiplexer circuit is connected to fourth input-output port of third optical multiplexer/demultiplexer circuit, when wavelength division multiplex signals having wavelength &lgr;1, &lgr;2, &lgr;3, &lgr;4, &lgr;5, &lgr;6 . . . are input through first input-output port of first optical multiplexer/demultiplexer circuit, multiplex signals of odd wavelength &lgr;1, &lgr;3, &lgr;5 . . .
    Type: Application
    Filed: November 8, 2002
    Publication date: May 15, 2003
    Inventors: Hideaki Arai, Takafumi Chiba, Hisato Uetsuka, Masahiro Hikage
  • Patent number: 6556749
    Abstract: The present invention relates to an array waveguide grating and a method of manufacture thereof, in which a substantially smooth wavelength-loss characteristics is obtained in a pass band, rather than increasing the loss. In an array waveguide grating (10), wavelength multiplex division signal light is demultiplexed by a channel waveguide array (15), reflected by a Fabry-Perot resonator array (16), and passed through the channel waveguide array (15) again, so that a substantially smooth wavelength-loss characteristic is obtained in the pass band, rather than increasing the loss.
    Type: Grant
    Filed: August 2, 2001
    Date of Patent: April 29, 2003
    Assignee: Hitachi Cable Limited
    Inventors: Hisato Uetsuka, Masahiro Okawa, Koichi Maru, Takafumi Chiba
  • Patent number: 6549696
    Abstract: An optical wavelength multiplexer/demultiplexer includes a substrate, an input channel waveguide, an input slab waveguide, a channel waveguide array which has a plurality of channel waveguides, each channel waveguide differing in length from its neighboring waveguide by predetermined amount, an output slab waveguide, and a plurality of output channel waveguides. The input slab waveguide or output slab waveguide have a temperature compensation material, in its light path, having an opposite sign of diffraction temperature change to the plurality of channel wave guides, or a material capable of canceling a change in the in-phase plane of light having each wavelength which occurs in a vicinity of the channel waveguide array and the slab waveguide, or a waveguide for band width adjustment on which a waveguide to adjust band width of wavelength multiplexing light is provided.
    Type: Grant
    Filed: August 8, 2000
    Date of Patent: April 15, 2003
    Assignee: Hitachi Cable, Ltd.
    Inventors: Hisato Uetsuka, Masahiro Okawa, Koichi Maru, Hideki Nounen, Tatsuo Teraoka