Tsutomu Ishikawa

Person

Yokohama-shi, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Method for manufacturing optical modulator, testing method, non-tra...
- Patent number 11,868,021
- Issue date Jan 9, 2024
- Sumitomo Electric Industries, Ltd.
- Tsutomu Ishikawa
- G02 - OPTICS
Information Patent Grant
Optical transmitter, method for controlling the same, and non-trans...
- Patent number 11,480,843
- Issue date Oct 25, 2022
- Sumitomo Electric Industries, Ltd.
- Tsutomu Ishikawa
- G02 - OPTICS
Information Patent Grant
Optical modulator
- Patent number 11,353,728
- Issue date Jun 7, 2022
- Sumitomo Electric Industries, Ltd.
- Hajime Tanaka
- G02 - OPTICS
Information Patent Grant
Optical modulator
- Patent number 11,048,140
- Issue date Jun 29, 2021
- Sumitomo Electric Industries, Ltd.
- Hajime Tanaka
- G02 - OPTICS
Information Patent Grant
Method to determine operating conditions of wavelength tunable lase...
- Patent number 9,595,808
- Issue date Mar 14, 2017
- Sumitomo Electric Industries, Ltd
- Tsutomu Ishikawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Method to determine operating conditions of wavelength tunable lase...
- Patent number 9,184,561
- Issue date Nov 10, 2015
- Sumitomo Electric Industries, Ltd
- Tsutomu Ishikawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Semiconductor laser
- Patent number 9,025,628
- Issue date May 5, 2015
- Sumitomo Electric Industries, Ltd.
- Tsutomu Ishikawa
- B82 - NANO-TECHNOLOGY
Information Patent Grant
Method for tuning semiconductor laser
- Patent number 8,681,826
- Issue date Mar 25, 2014
- Sumitomo Electric Device Innovations, Inc.
- Hirokazu Tanaka
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Optical semiconductor device, laser chip and laser module
- Patent number 8,563,991
- Issue date Oct 22, 2013
- Eudyna Devices Inc.
- Tsutomu Ishikawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Method of controlling wavelength-tunable laser
- Patent number 8,457,166
- Issue date Jun 4, 2013
- Sumitomo Electric Device Innovations, Inc.
- Masao Shibata
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Method of controlling wavelength-tunable laser
- Patent number 8,311,068
- Issue date Nov 13, 2012
- Sumitomo Electric Device Innovations, Inc.
- Masao Shibata
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Semiconductor laser with heater
- Patent number 8,194,710
- Issue date Jun 5, 2012
- Eudyna Devices Inc.
- Tsutomu Ishikawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Optical semiconductor device, laser chip and laser module
- Patent number 8,101,957
- Issue date Jan 24, 2012
- Eudyna Devices Inc.
- Tsutomu Ishikawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Tunable laser module, tunable laser apparatus and controlling metho...
- Patent number 7,940,819
- Issue date May 10, 2011
- Fujitsu Limited
- Kazumasa Takabayashi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Testing method of wavelength-tunable laser, controlling method of w...
- Patent number 7,929,581
- Issue date Apr 19, 2011
- Eudyna Devices Inc.
- Tsutomu Ishikawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Optical device and method of controlling the same
- Patent number 7,812,594
- Issue date Oct 12, 2010
- Eudyna Devices Inc.
- Tsutomu Ishikawa
- G02 - OPTICS
Information Patent Grant
Method of controlling semiconductor laser
- Patent number 7,813,391
- Issue date Oct 12, 2010
- Eudyna Devices Inc.
- Hirokazu Tanaka
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Optical semiconductor element and optical semiconductor device
- Patent number 7,656,927
- Issue date Feb 2, 2010
- Eudyna Devices Inc.
- Tsutomu Ishikawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Optical semiconductor device
- Patent number 7,515,779
- Issue date Apr 7, 2009
- Eudyna Devices Inc.
- Tsutomu Ishikawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Optical semiconductor element and optical semiconductor device
- Patent number 7,474,684
- Issue date Jan 6, 2009
- Eudyna Devices Inc.
- Tsutomu Ishikawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Optical semiconductor device and controlling method of the same
- Patent number 7,362,782
- Issue date Apr 22, 2008
- Eudyna Devices Inc.
- Tsutomu Ishikawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Gain-coupled DFB laser diode
- Patent number 6,925,103
- Issue date Aug 2, 2005
- Fujitsu Limited
- Tsutomu Ishikawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Complex coupling MQW semiconductor laser
- Patent number 6,850,550
- Issue date Feb 1, 2005
- Fujitsu Limited
- Hirohiko Kobayashi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Semiconductor integrated circuit having pads with less input signal...
- Patent number 6,771,112
- Issue date Aug 3, 2004
- Sanyo Electric Co., Inc.
- Tsutomu Ishikawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Optical semiconductor device
- Patent number 6,606,174
- Issue date Aug 12, 2003
- Sanyo Electric Co., LTD
- Tsutomu Ishikawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Distributed feedback semiconductor laser
- Patent number 6,560,266
- Issue date May 6, 2003
- Fujitsu Limited
- Hajime Shoji
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Semiconductor light-emitting device
- Patent number 6,426,515
- Issue date Jul 30, 2002
- Fujitsu Limited
- Tsutomu Ishikawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Optical semiconductor device and optical semiconductor module equip...
- Patent number 6,252,252
- Issue date Jun 26, 2001
- Sanyo Electric Co., Ltd.
- Hideo Kunii
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Signal processing circuit for an optical disk player including data...
- Patent number 5,777,955
- Issue date Jul 7, 1998
- Sanyo Electric Co., Ltd.
- Osamu Ikeda
- G11 - INFORMATION STORAGE
Information Patent Grant
Delay circuit using a digital memory
- Patent number 5,576,709
- Issue date Nov 19, 1996
- Sanyo Electric Co., Ltd.
- Masato Onaya
- G11 - INFORMATION STORAGE

Patents Applicationslast 30 patents

Information Patent Application
OPTICAL FILTER, METHOD OF MANUFACTURING AN OPTICAL FILTER, METHOD O...
- Publication number 20250020866
- Publication date Jan 16, 2025
- Sumitomo Electric Industries, Ltd.
- Tsutomu Ishikawa
- G02 - OPTICS
Information Patent Application
OPTICAL FILTER
- Publication number 20240418938
- Publication date Dec 19, 2024
- Sumitomo Electric Industries, Ltd.
- Takuo HIRATANI
- G02 - OPTICS
Information Patent Application
WAVELENGTH TUNABLE LASER DEVICE AND METHOD OF MANUFACTURING THE SAME
- Publication number 20240178634
- Publication date May 30, 2024
- Sumitomo Electric Industries, Ltd.
- Tsutomu ISHIKAWA
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
CONTROL METHOD AND CONTROL DEVICE OF WAVELENGTH TUNABLE LASER DEVIC...
- Publication number 20240178635
- Publication date May 30, 2024
- Sumitomo Electric Industries, Ltd.
- Tsutomu ISHIKAWA
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
METHOD FOR MANUFACTURING OPTICAL MODULATOR, TESTING METHOD, NON-TRA...
- Publication number 20220244613
- Publication date Aug 4, 2022
- Sumitomo Electric Industries, Ltd.
- Tsutomu ISHIKAWA
- G02 - OPTICS
Information Patent Application
METHOD FOR MANUFACTURING OPTICAL MODULATOR, TESTING METHOD, NON-TRA...
- Publication number 20220236620
- Publication date Jul 28, 2022
- Sumitomo Electric Industries, Ltd.
- Tsutomu ISHIKAWA
- G01 - MEASURING TESTING
Information Patent Application
OPTICAL TRANSMITTER, METHOD FOR CONTROLLING THE SAME, AND NON-TRANS...
- Publication number 20210364878
- Publication date Nov 25, 2021
- Sumitomo Electric Industries, Ltd.
- Tsutomu ISHIKAWA
- G02 - OPTICS
Information Patent Application
OPTICAL MODULATOR
- Publication number 20210055622
- Publication date Feb 25, 2021
- Sumitomo Electric Industries, Ltd.
- Hajime TANAKA
- G02 - OPTICS
Information Patent Application
OPTICAL MODULATOR
- Publication number 20200192132
- Publication date Jun 18, 2020
- Sumitomo Electric Industries, Ltd.
- Hajime TANAKA
- G02 - OPTICS
Information Patent Application
METHOD TO DETERMINE OPERATING CONDITIONS OF WAVELENGTH TUNABLE LASE...
- Publication number 20160036199
- Publication date Feb 4, 2016
- SUMITOMO ELECTRIC INDUSTRIES,LTD.
- Tsutomu Ishikawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
METHOD TO DETERMINE OPERATING CONDITIONS OF WAVELENGTH TUNABLE LASE...
- Publication number 20150092798
- Publication date Apr 2, 2015
- Sumitomo Electric Industries, Ltd.
- Tsutomu ISHIKAWA
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
SEMICONDUCTOR LASER
- Publication number 20130308666
- Publication date Nov 21, 2013
- Sumitomo Electric Industries, Ltd.
- Tsutomu Ishikawa
- B82 - NANO-TECHNOLOGY
Information Patent Application
METHOD OF CONTROLLING WAVELENGTH-TUNABLE LASER
- Publication number 20130039370
- Publication date Feb 14, 2013
- SUMITOMO ELECTRIC DEVICE INNOVATIONS, INC.
- Masao SHIBATA
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
OPTICAL SEMICONDUCTOR DEVICE, LASER CHIP AND LASER MODULE
- Publication number 20120097984
- Publication date Apr 26, 2012
- EUDYNA DEVICES INC.
- Tsutomu Ishikawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
WAVELENGTH TUNABLE SEMICONDUCTOR LASER
- Publication number 20110292960
- Publication date Dec 1, 2011
- SUMITOMO ELECTRIC DEVICE INNOVATIONS, INC.
- Hajime Shoji
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
METHOD FOR TUNING SEMICONDUCTOR LASER
- Publication number 20110228800
- Publication date Sep 22, 2011
- SUMITOMO ELECTRIC DEVICE INNOVATIONS, INC.
- Hirokazu Tanaka
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
METHOD OF CONTROLLING WAVELENGTH-TUNABLE LASER
- Publication number 20110200062
- Publication date Aug 18, 2011
- SUMITOMO ELECTRIC DEVICE INNOVATIONS, INC.
- Masao SHIBATA
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
SEMICONDUCTOR LASER DEVICE
- Publication number 20110164634
- Publication date Jul 7, 2011
- SUMITOMO ELECTRIC DEVICE INNOVATIONS, INC.
- Satsuki KOBAYASHI
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
LASER DEVICE AND LASER DEVICE CONTROL DATA
- Publication number 20100296532
- Publication date Nov 25, 2010
- SUMITOMO ELECTRIC DEVICE INNOVATIONS, INC.
- Hirokazu Tanaka
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
OPTICAL SEMICONDUCTOR ELEMENT AND OPTICAL SEMICONDUCTOR DEVICE
- Publication number 20100091805
- Publication date Apr 15, 2010
- EUDYNA DEVICES INC.
- Tsutomu Ishikawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
Optical Semiconductor Device
- Publication number 20100040101
- Publication date Feb 18, 2010
- EUDYNA DEVICES, INC.
- Tsutomu Ishikawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
TUNABLE LASER MODULE, TUNABLE LASER APPARATUS AND CONTROLLING METHO...
- Publication number 20100034224
- Publication date Feb 11, 2010
- Fujitsu Limited
- Kazumasa Takabayashi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
TESTING METHOD OF WAVELENGTH-TUNABLE LASER, CONTROLLING METHOD OF W...
- Publication number 20090168817
- Publication date Jul 2, 2009
- EUDYNA DEVICES INC.
- Tsutomu ISHIKAWA
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
Optical semiconductor element and optical semiconductor device
- Publication number 20090103585
- Publication date Apr 23, 2009
- EUDYNA DEVICES, INC.
- Tsutomu Ishikawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
METHOD OF CONTROLLING SEMICONDUCTOR LASER
- Publication number 20090022185
- Publication date Jan 22, 2009
- EUDYNA DEVICES INC.
- Toyotoshi MACHIDA
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
OPTICAL DEVICE AND METHOD OF CONTROLLING THE SAME
- Publication number 20090021238
- Publication date Jan 22, 2009
- EUDYNA DEVICES INC.
- Tsutomu ISHIKAWA
- G02 - OPTICS
Information Patent Application
METHOD OF CONTROLLING SEMICONDUCTOR LASER
- Publication number 20090022186
- Publication date Jan 22, 2009
- EUDYNA DEVICES INC.
- Hirokazu TANAKA
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
Optical semiconductor element and optical semiconductor device
- Publication number 20070228551
- Publication date Oct 4, 2007
- EUDYNA DEVICE INC.
- Tsutomu Ishikawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
Optical semiconductor device, laser chip and laser module
- Publication number 20070230523
- Publication date Oct 4, 2007
- EUDYNA DEVICES INC.
- Tsutomu Ishikawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
Optical semiconductor device
- Publication number 20070230522
- Publication date Oct 4, 2007
- EUDYNA DEVICES INC.
- Tsutomu Ishikawa
- H01 - BASIC ELECTRIC ELEMENTS

Tsutomu Ishikawa

Person

Patents Grantslast 30 patents

Method for manufacturing optical modulator, testing method, non-tra...

Optical transmitter, method for controlling the same, and non-trans...

Optical modulator

Optical modulator

Method to determine operating conditions of wavelength tunable lase...

Method to determine operating conditions of wavelength tunable lase...

Semiconductor laser

Method for tuning semiconductor laser

Optical semiconductor device, laser chip and laser module

Method of controlling wavelength-tunable laser

Method of controlling wavelength-tunable laser

Semiconductor laser with heater

Optical semiconductor device, laser chip and laser module

Tunable laser module, tunable laser apparatus and controlling metho...

Testing method of wavelength-tunable laser, controlling method of w...

Optical device and method of controlling the same

Method of controlling semiconductor laser

Optical semiconductor element and optical semiconductor device

Optical semiconductor device

Optical semiconductor element and optical semiconductor device

Optical semiconductor device and controlling method of the same

Gain-coupled DFB laser diode

Complex coupling MQW semiconductor laser

Semiconductor integrated circuit having pads with less input signal...

Optical semiconductor device

Distributed feedback semiconductor laser

Semiconductor light-emitting device

Optical semiconductor device and optical semiconductor module equip...

Signal processing circuit for an optical disk player including data...

Delay circuit using a digital memory

Patents Applicationslast 30 patents

OPTICAL FILTER, METHOD OF MANUFACTURING AN OPTICAL FILTER, METHOD O...

OPTICAL FILTER

WAVELENGTH TUNABLE LASER DEVICE AND METHOD OF MANUFACTURING THE SAME

CONTROL METHOD AND CONTROL DEVICE OF WAVELENGTH TUNABLE LASER DEVIC...

METHOD FOR MANUFACTURING OPTICAL MODULATOR, TESTING METHOD, NON-TRA...

METHOD FOR MANUFACTURING OPTICAL MODULATOR, TESTING METHOD, NON-TRA...

OPTICAL TRANSMITTER, METHOD FOR CONTROLLING THE SAME, AND NON-TRANS...

OPTICAL MODULATOR

OPTICAL MODULATOR

METHOD TO DETERMINE OPERATING CONDITIONS OF WAVELENGTH TUNABLE LASE...

METHOD TO DETERMINE OPERATING CONDITIONS OF WAVELENGTH TUNABLE LASE...

SEMICONDUCTOR LASER

METHOD OF CONTROLLING WAVELENGTH-TUNABLE LASER

OPTICAL SEMICONDUCTOR DEVICE, LASER CHIP AND LASER MODULE

WAVELENGTH TUNABLE SEMICONDUCTOR LASER

METHOD FOR TUNING SEMICONDUCTOR LASER

METHOD OF CONTROLLING WAVELENGTH-TUNABLE LASER

SEMICONDUCTOR LASER DEVICE

LASER DEVICE AND LASER DEVICE CONTROL DATA

OPTICAL SEMICONDUCTOR ELEMENT AND OPTICAL SEMICONDUCTOR DEVICE

Optical Semiconductor Device

TUNABLE LASER MODULE, TUNABLE LASER APPARATUS AND CONTROLLING METHO...

TESTING METHOD OF WAVELENGTH-TUNABLE LASER, CONTROLLING METHOD OF W...

Optical semiconductor element and optical semiconductor device

METHOD OF CONTROLLING SEMICONDUCTOR LASER

OPTICAL DEVICE AND METHOD OF CONTROLLING THE SAME

METHOD OF CONTROLLING SEMICONDUCTOR LASER

Optical semiconductor element and optical semiconductor device

Optical semiconductor device, laser chip and laser module

Optical semiconductor device