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Tadao Nakagawa
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Yokosuka-shi, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Coherent communication system, communication method, and transmissi...
Patent number
9,621,299
Issue date
Apr 11, 2017
Nippon Telegraph and Telephone Corporation
Koichi Ishihara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Signal generating circuit, optical signal transmitting apparatus, s...
Patent number
9,614,621
Issue date
Apr 4, 2017
Nippon Telegraph and Telephone Corporation
Koichi Ishihara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Signal generating circuit, optical signal transmitting apparatus, s...
Patent number
9,520,947
Issue date
Dec 13, 2016
Nippon Telegraph and Telephone Corporation
Koichi Ishihara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Method for estimating amount of wavelength dispersion, wavelength d...
Patent number
9,178,614
Issue date
Nov 3, 2015
Nippon Telegraph and Telephone Corporation
Etsushi Yamazaki
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Method for receiving frequency domain multiplexed signal and device...
Patent number
9,160,600
Issue date
Oct 13, 2015
Nippon Telegraph and Telephone Corporation
Riichi Kudo
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Wavelength dispersion amount estimation method, wavelength dispersi...
Patent number
8,971,703
Issue date
Mar 3, 2015
Nippon Telegraph and Telephone Corporation
Etsushi Yamazaki
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Transmission method, reception method, transmitter apparatus, and r...
Patent number
8,934,782
Issue date
Jan 13, 2015
Nippon Telegraph and Telephone Corporation
Tadao Nakagawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Signal generating circuit, optical signal transmitting apparatus, s...
Patent number
8,929,750
Issue date
Jan 6, 2015
Nippon Telegraph and Telephone Corporation
Koichi Ishihara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Frequency offset estimating method and frequency offset estimating...
Patent number
8,855,485
Issue date
Oct 7, 2014
Nippon Telegraph and Telephone Corporation
Tadao Nakagawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Chromatic dispersion value calculating apparatus, optical signal re...
Patent number
8,787,769
Issue date
Jul 22, 2014
Nippon Telegraph and Telephone Corporation
Koichi Ishihara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Frequency offset estimation apparatus, reception apparatus, frequen...
Patent number
8,781,029
Issue date
Jul 15, 2014
Nippon Telegraph and Telephone Corporation
Tadao Nakagawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Direct digital synthesizer
Patent number
5,789,950
Issue date
Aug 4, 1998
Nippon Telegraph & Telephone Corporation
Tadao Nakagawa
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Fractional-N frequency divider system
Patent number
5,714,896
Issue date
Feb 3, 1998
Nippon Telegraph & Telephone Corporation
Tadao Nakagawa
G06 - COMPUTING CALCULATING COUNTING
Patents Applications
last 30 patents
Information
Patent Application
COHERENT COMMUNICATION SYSTEM, COMMUNICATION METHOD, AND TRANSMISSI...
Publication number
20150341138
Publication date
Nov 26, 2015
Nippon Telegraph and Telephone Corporation
Koichi ISHIHARA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
SIGNAL GENERATING CIRCUIT, OPTICAL SIGNAL TRANSMITTING APPARATUS, S...
Publication number
20150078765
Publication date
Mar 19, 2015
Nippon Telegraph and Telephone Corporation
Koichi Ishihara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
SIGNAL GENERATING CIRCUIT, OPTICAL SIGNAL TRANSMITTING APPARATUS, S...
Publication number
20150078762
Publication date
Mar 19, 2015
Nippon Telegraph and Telephone Corporation
Koichi Ishihara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
METHOD FOR ESTIMATING AMOUNT OF WAVELENGTH DISPERSION, WAVELENGTH D...
Publication number
20140016929
Publication date
Jan 16, 2014
Nippon Telegraph and Telephone Corporation
Etsushi Yamazaki
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
WAVELENGTH DISPERSION AMOUNT ESTIMATION METHOD, WAVELENGTH DISPERSI...
Publication number
20130343749
Publication date
Dec 26, 2013
Etsushi Yamazaki
G01 - MEASURING TESTING
Information
Patent Application
FREQUENCY OFFSET ESTIMATION APPARATUS, FREQUENCY OFFSET ESTIMATION...
Publication number
20130070874
Publication date
Mar 21, 2013
Nippon Telegraph and Telephone Corporation
Tadao Nakagawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
FREQUENCY OFFSET ESTIMATING METHOD AND FREQUENCY OFFSET ESTIMATING...
Publication number
20130028595
Publication date
Jan 31, 2013
Nippon Telegraph and Telephone Corporation
Tadao Nakagawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
TRANSMISSION METHOD, RECEPTION METHOD, TRANSMITTER APPARATUS, AND R...
Publication number
20120315043
Publication date
Dec 13, 2012
Nippon Telegraph and Telephone Corporation
Tadao Nakagawa
G02 - OPTICS
Information
Patent Application
METHOD FOR RECEIVING FREQUENCY DOMAIN MULTIPLEXED SIGNAL AND DEVICE...
Publication number
20120106618
Publication date
May 3, 2012
Nippon Telegraph and Telephone Corporation
Riichi Kudo
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
CHROMATIC DISPERSION VALUE CALCULATING APPARATUS, OPTICAL SIGNAL RE...
Publication number
20120099864
Publication date
Apr 26, 2012
Nippon Telegraph and Telephone Corporation
Koichi Ishihara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
SIGNAL GENERATING CIRCUIT, OPTICAL SIGNAL TRANSMITTING APPARATUS, S...
Publication number
20120070159
Publication date
Mar 22, 2012
Nippon Telegraph and Telephone Corporation
Koichi Ishihara
H04 - ELECTRIC COMMUNICATION TECHNIQUE