P

Inventor

UETSUKA HISATO

JP29 patents
⚠️ This page may combine multiple inventors who share the name “UETSUKA HISATO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

HITACHI CABLE

14 patents
US5499308AMar 12, 1996

Guided-wave optical multi/demultiplexer

HITACHI CABLE204 citations99
US5812709ASep 22, 1998

Optical device having switching function

HITACHI CABLE110 citations97
US6069990AMay 30, 2000

Optical wavelength multiplexer/demultiplexer

HITACHI CABLE115 citations96
US6031957AFeb 29, 2000

Glass wave guide element and method of manufacturing the same

HITACHI CABLE36 citations92
US5848207ADec 8, 1998

Optical device formed with grating therein, add/drop filter using same, and method of fabricating same

HITACHI CABLE21 citations92
US5832154ANov 3, 1998

Optical device formed with grating therein, add/drop filter using same, and method of fabricating same

HITACHI CABLE17 citations92
US4753497AJun 28, 1988

Directional coupler for coupling single-polarization optical fibers

HITACHI CABLE48 citations92
US5995691ANov 30, 1999

Waveguide type grating device

HITACHI CABLE29 citations91
US6549696B1Apr 15, 2003

Optical wavelength multiplexer/demultiplexer

HITACHI CABLE40 citations90
US6556749B2Apr 29, 2003

Array waveguide grating and method of manufacture thereof

HITACHI CABLE17 citations82
US6947631B2Sep 20, 2005

Waveguide-type optical multiplexer/demultiplexer

HITACHI CABLE19 citations80
US6093334AJul 25, 2000

Glass wave guide element and method of manufacturing the same

HITACHI CABLE8 citations73
US6631223B2Oct 7, 2003

Optical multiplexer/demultiplexer

HITACHI CABLE6 citations62
US6980707B2Dec 27, 2005

Waveguide type variable optical attenuator

HITACHI CABLE3 citations60

AIST

4 patents
US11327381B2May 10, 2022

Light beam switching element, assembly of same, and control method for same

AIST0 citations62
US10989981B2Apr 27, 2021

Optical beam deflection element and module

AIST1 citations59
US11635501B2Apr 25, 2023

Circular polarization-type polarization diversity element, scanning element using same, and lidar

AIST0 citations52
US11099446B2Aug 24, 2021

High-speed optical switching engine

AIST0 citations52

HITACHI LTD

2 patents
US5903697AMay 11, 1999

Optical waveguide, method of making the same and integrated optical device

HITACHI LTD12 citations73
US4953934ASep 4, 1990

Waveguide type light merging and branching device

HITACHI LTD9 citations71

ISHIKAWA HIROSHI

2 patents
US8503836B2Aug 6, 2013

Wavelength domain optical switch

ISHIKAWA HIROSHI4 citations60
US8229258B2Jul 24, 2012

Optical waveguide-type wavelength domain switch

ISHIKAWA HIROSHI5 citations60

SHARP KK

1 patent
US6021239AFeb 1, 2000

Photocoupler and method for producing the same

SHARP KK86 citations96

NAT INST OF ADVANCED IND SCIEN

1 patent
US7567736B2Jul 28, 2009

Waveguide type wavelength domain optical switch

NAT INST OF ADVANCED IND SCIEN11 citations82

HITACHI CABLE INC

1 patent
US6724954B2Apr 20, 2004

Optical multiplexer/demultiplexer

HITACHI CABLE INC14 citations82

UNIV KEIO

1 patent
US7496256B2Feb 24, 2009

Diffraction grating and dispersion compensation circuit

UNIV KEIO3 citations63

AGILENT TECHNOLOGIES INC

1 patent
US6668107B2Dec 23, 2003

Method and apparatus for reducing optical insertion loss in planar lightwave circuits through dielectric perturbation optimization

AGILENT TECHNOLOGIES INC3 citations62

KOKUSAI DENSHIN DENWA CO LTD

1 patent
US6317534B1Nov 13, 2001

Optical wavelength routing device

KOKUSAI DENSHIN DENWA CO LTD2 citations62

NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE & TECH

1 patent
US10613412B2Apr 7, 2020

Light beam deflecting element, wavelength-selective cross-connect device using same, and optical cross-connect device

NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE & TECH0 citations36