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Katsumi Iwatsuki
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Kanagawa, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Optical wavelength multiplexing access system
Patent number
8,014,672
Issue date
Sep 6, 2011
Nippon Telegraph and Telephone Corporation
Hiroo Suzuki
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical communication light source unit and wavelength monitoring c...
Patent number
7,869,717
Issue date
Jan 11, 2011
Nippon Telegraph and Telephone Corporation
Shingo Kawai
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Optical wavelength division multiplexing access system
Patent number
7,555,215
Issue date
Jun 30, 2009
Nippon Telegraph and Telephone Corporation
Hirotaka Nakamura
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical modulation apparatus
Patent number
7,474,460
Issue date
Jan 6, 2009
Nippon Telegraph and Telephone Corporation
Masamichi Fujiwara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical module and method for monitoring and controlling wavelengths
Patent number
7,460,572
Issue date
Dec 2, 2008
Nippon Telegraph and Telephone Corporation
Shingo Kawai
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Node apparatus, optical wavelength division multiplexing network, a...
Patent number
7,433,594
Issue date
Oct 7, 2008
Nippon Telegraph and Telephone Corporation
Noboru Takachio
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical wavelength-division multiple access system and optical netw...
Patent number
7,389,048
Issue date
Jun 17, 2008
Nippon Telegraph and Telephone Corporation
Jun-ichi Kani
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical modulating device
Patent number
7,336,414
Issue date
Feb 26, 2008
Nippon Telegraph and Telephone Corporation
Masamichi Fujiwara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Ring network using multi-wavelength generator
Patent number
7,206,510
Issue date
Apr 17, 2007
Nippon Telegraph and Telephone Corporation
Hiroo Suzuki
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical network unit, wavelength splitter, and optical wavelength-d...
Patent number
7,203,422
Issue date
Apr 10, 2007
Nippon Telegraph and Telephone Corporation
Jun-ichi Kani
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Node apparatus, optical wavelength division multiplexing network, a...
Patent number
7,164,861
Issue date
Jan 16, 2007
Nippon Telegraph and Telephone Corporation
Noboru Takachio
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical communication system, optical communication unit, and optic...
Patent number
7,155,127
Issue date
Dec 26, 2006
Nippon Telegraph and Telephone Corporation
Koji Akimoto
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Multi-wavelength optical modulation circuit and wavelength-division...
Patent number
7,127,168
Issue date
Oct 24, 2006
Nippon Telegraph and Telephone Corporation
Jun-ichi Kani
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Polarization scrambler and optical network using the same
Patent number
7,106,970
Issue date
Sep 12, 2006
Nippon Telegraph and Telephone Corporation
Masamichi Fujiwara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Low-cost optical burst transmission system, apparatus, and method
Patent number
7,076,166
Issue date
Jul 11, 2006
Matsushita Electric Industrial Co., Ltd.
Masaru Fuse
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Polarization scrambler and optical network using the same
Patent number
7,031,614
Issue date
Apr 18, 2006
Nippon Telegraph and Telephone Corporation
Masamichi Fujiwara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Polarization scrambler and optical network using the same
Patent number
6,959,152
Issue date
Oct 25, 2005
Nippon Telegraph and Telephone Corporation
Masamichi Fujiwara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical transmission line and optical transmission system
Patent number
5,986,789
Issue date
Nov 16, 1999
Nippon Telegraph & Telephone Corporation
Shingo Kawai
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical fiber transmission line, optical fiber transmission system...
Patent number
5,764,841
Issue date
Jun 9, 1998
Nippon Telegraph & Telephone Corporation
Katsumi Iwatsuki
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Method for measuring distribution of zero dispersion wavelengths in...
Patent number
5,724,126
Issue date
Mar 3, 1998
Nippon Telegraph & Telephone Corporation
Shigendo Nishi
G01 - MEASURING TESTING
Patents Applications
last 30 patents
Information
Patent Application
Optical Communication Light Source Unit and Wavelength Monitoring C...
Publication number
20090161708
Publication date
Jun 25, 2009
Nippon Telegraph and Telephone Corporation
Shingo Kawai
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Application
OPTICAL WAVELENGTH MULTIPLEXING ACCESS SYSTEM
Publication number
20090016726
Publication date
Jan 15, 2009
Nippon Telegraph and Telephone Corporation
Hiroo Suzuki
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical modulation apparatus
Publication number
20070127113
Publication date
Jun 7, 2007
Nippon Telegraph and Telephone Corporation
Masamichi Fujiwara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Node apparatus, optical wavelength division multiplexing network, a...
Publication number
20070031146
Publication date
Feb 8, 2007
Nippon Telegraph and Telephone Corporation
Noboru Takachio
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical module and its wavelength monitor control method
Publication number
20060145051
Publication date
Jul 6, 2006
Shingo Kawai
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Application
Optical wavelength multiplex access system and optical network unit
Publication number
20060146855
Publication date
Jul 6, 2006
Jun-ichi Kani
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical wavelength multiplex access system
Publication number
20060062576
Publication date
Mar 23, 2006
Hirotaka Nakamura
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical modulating device
Publication number
20060024066
Publication date
Feb 2, 2006
Masamichi Fujiwara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Polarization scrambler and optical network using the same
Publication number
20050220457
Publication date
Oct 6, 2005
Nippon Telegraph and Telephone Corporation
Masamichi Fujiwara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Polarization scrambler and optical network using the same
Publication number
20050213991
Publication date
Sep 29, 2005
Nippon Telegraph
Masamichi Fujiwara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical network unit, wavelength splitter, and optical wavelength-d...
Publication number
20040264963
Publication date
Dec 30, 2004
Jun-ichi Kani
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Polarization scrambler and optical network using the same
Publication number
20030161638
Publication date
Aug 28, 2003
Nippon Telegraph and Telephone Corporation
Masamichi Fujiwara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Ring network using multi-wavelength generator
Publication number
20030067649
Publication date
Apr 10, 2003
Nippon Telegraph and Telephone Corporation
Hiroo Suzuki
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical communication system, optical communication unit, and optic...
Publication number
20030039010
Publication date
Feb 27, 2003
Nippon Telegraph and Telephone Corporation
Koji Akimoto
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Low-cost optical burst transmission system, apparatus, and method
Publication number
20030030877
Publication date
Feb 13, 2003
Masaru Fuse
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Multi-wavelength optical modulation circuit and wavelength-division...
Publication number
20020191904
Publication date
Dec 19, 2002
Nippon Telegraph and Telephone Corporation
Jun-Ichi Kani
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Node apparatus, optical wavelength division multiplexing network, a...
Publication number
20010017722
Publication date
Aug 30, 2001
Noboru Takachio
H04 - ELECTRIC COMMUNICATION TECHNIQUE