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Patents Grants
last 30 patents
Information
Patent Grant
Optical and electronic integrated switch
Patent number
12,107,762
Issue date
Oct 1, 2024
Nippon Telegraph and Telephone Corporation
Osamu Moriwaki
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical communication network management apparatus
Patent number
12,034,484
Issue date
Jul 9, 2024
Nippon Telegraph and Telephone Corporation
Takafumi Tanaka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical and electronic integrated switch
Patent number
11,979,694
Issue date
May 7, 2024
Nippon Telegraph and Telephone Corporation
Osamu Moriwaki
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical and electronic integrated switch
Patent number
11,930,309
Issue date
Mar 12, 2024
Nippon Telegraph and Telephone Corporation
Keita Yamaguchi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical and electronic integrated switch and optical network system
Patent number
11,881,897
Issue date
Jan 23, 2024
Nippon Telegraph and Telephone Corporation
Hideki Nishizawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Signal processing apparatus, signal processing method, and program
Patent number
11,799,547
Issue date
Oct 24, 2023
Nippon Telegraph and Telephone Corporation
Kengo Horikoshi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical transmitting apparatus and transmission characteristics est...
Patent number
11,728,889
Issue date
Aug 15, 2023
Nippon Telegraph and Telephone Corporation
Takeo Sasai
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Wavelength dispersion compensation apparatus, optical receiving app...
Patent number
11,683,093
Issue date
Jun 20, 2023
Nippon Telegraph and Telephone Corporation
Masanori Nakamura
H03 - BASIC ELECTRONIC CIRCUITRY
Information
Patent Grant
Signal processing apparatus and signal processing method
Patent number
11,671,119
Issue date
Jun 6, 2023
Nippon Telegraph and Telephone Corporation
Seiji Okamoto
H03 - BASIC ELECTRONIC CIRCUITRY
Information
Patent Grant
Optical transmission system
Patent number
11,581,944
Issue date
Feb 14, 2023
Nippon Telegraph and Telephone Corporation
Shuto Yamamoto
H03 - BASIC ELECTRONIC CIRCUITRY
Information
Patent Grant
Optical transmission system and transmission mode selecting method
Patent number
11,546,064
Issue date
Jan 3, 2023
Nippon Telegraph and Telephone Corporation
Tetsuro Inui
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Wavelength dispersion amount estimation apparatus
Patent number
11,463,169
Issue date
Oct 4, 2022
Nippon Telegraph and Telephone Corporation
Kengo Horikoshi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical transmission system, optical receiving apparatus and optica...
Patent number
11,444,699
Issue date
Sep 13, 2022
Nippon Telegraph and Telephone Corporation
Akira Masuda
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical receiving apparatus and waveform distortion compensation me...
Patent number
11,381,317
Issue date
Jul 5, 2022
Nippon Telegraph and Telephone Corporation
Seiji Okamoto
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical transmission system, optical transmitting apparatus, and op...
Patent number
11,349,572
Issue date
May 31, 2022
Nippon Telegraph and Telephone Corporation
Masanori Nakamura
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
State estimating device and communication system
Patent number
11,342,990
Issue date
May 24, 2022
Nippon Telegraph and Telephone Corporation
Seiki Kuwabara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Wavelength dispersion compensation apparatus, wavelength dispersion...
Patent number
11,316,588
Issue date
Apr 26, 2022
Nippon Telegraph and Telephone Corporation
Kyo Minoguchi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Communication system, optical transmitting apparatus, and optical r...
Patent number
11,303,359
Issue date
Apr 12, 2022
Nippon Telegraph and Telephone Corporation
Seiji Okamoto
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Digital coherent receiver and digital coherent receiving method
Patent number
11,283,528
Issue date
Mar 22, 2022
Nippon Telegraph and Telephone Corporation
Akira Masuda
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Receiving apparatus and receiving method
Patent number
11,258,512
Issue date
Feb 22, 2022
Nippon Telegraph and Telephone Corporation
Seiji Okamoto
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical transmission control method and optical transmission system
Patent number
11,245,487
Issue date
Feb 8, 2022
Nippon Telegraph and Telephone Corporation
Fukutaro Hamaoka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical transmission system and communication condition selection m...
Patent number
11,165,497
Issue date
Nov 2, 2021
Nippon Telegraph and Telephone Corporation
Fumikazu Inuzuka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Signal-to-noise ratio estimation method, optical transmission appar...
Patent number
10,841,006
Issue date
Nov 17, 2020
Nippon Telegraph and Telephone Corporation
Seiji Okamoto
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical receiver, optical reception method, and optical communicati...
Patent number
10,826,620
Issue date
Nov 3, 2020
Nippon Telegraph and Telephone Corporation
Fukutaro Hamaoka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical transmitter, optical receiver, optical data transmission sy...
Patent number
10,651,944
Issue date
May 12, 2020
Nippon Telegraph and Telephone Corporation
Kengo Horikoshi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Known signal detection method
Patent number
10,523,335
Issue date
Dec 31, 2019
NTT Electronics Corporation
Yasuharu Onuma
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Coherent optical reception device
Patent number
10,389,452
Issue date
Aug 20, 2019
Nippon Telegraph and Telephone Corporation
Kengo Horikoshi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical signal transmission apparatus and optical signal transmissi...
Patent number
10,171,173
Issue date
Jan 1, 2019
Nippon Telegraph and Telephone Corporation
Seiji Okamoto
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical transmission system, phase compensation method, and optical...
Patent number
10,038,507
Issue date
Jul 31, 2018
Nippon Telegraph and Telephone Corporation
Mitsuteru Yoshida
H04 - ELECTRIC COMMUNICATION TECHNIQUE
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
Patents Applications
last 30 patents
Information
Patent Application
OPTICAL TRANSMISSION SYSTEM AND TRANSMISSION MODE SELECTING METHOD
Publication number
20240235690
Publication date
Jul 11, 2024
Nippon Telegraph and Telephone Corporation
Tetsuro Inui
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL TRANSMISSION SYSTEM AND TRANSMISSION MODE SELECTING METHOD
Publication number
20240137128
Publication date
Apr 25, 2024
Nippon Telegraph and Telephone Corporation
Tetsuro Inui
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
ADAPTIVE EQUALIZER, STEP SIZE DERIVATION METHOD AND PROGRAM
Publication number
20240007195
Publication date
Jan 4, 2024
Nippon Telegraph and Telephone Corporation
Kengo HORIKOSHI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
ADAPTIVE EQUALIZATION FILTER AND METHOD FOR UPDATING FILTER COEFFIC...
Publication number
20230421420
Publication date
Dec 28, 2023
Nippon Telegraph and Telephone Corporation
Etsushi YAMAZAKI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical and Electronic Integrated Switch
Publication number
20230136142
Publication date
May 4, 2023
Nippon Telegraph and Telephone Corporation
Osamu Moriwaki
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL RECEIVING APPARATUS AND OPTICAL RECEIVING METHOD
Publication number
20230097741
Publication date
Mar 30, 2023
Nippon Telegraph and Telephone Corporation
Kengo HORIKOSHI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical and Electronic Integrated Switch and Optical Network System
Publication number
20230082854
Publication date
Mar 16, 2023
Nippon Telegraph and Telephone Corporation
Hideki Nishizawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL COMMUNICATION NETWORK MANAGEMENT APPARATUS
Publication number
20230076671
Publication date
Mar 9, 2023
Nippon Telegraph and Telephone Corporation
Takafumi TANAKA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical and Electronic Integrated Switch
Publication number
20230073384
Publication date
Mar 9, 2023
Nippon Telegraph and Telephone Corporation
Osamu Moriwaki
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Optical and Electronic Integrated Switch
Publication number
20230060777
Publication date
Mar 2, 2023
Nippon Telegraph and Telephone Corporation
Keita Yamaguchi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL TRANSMITTING APPARATUS AND TRANSMISSION CHARACTERISTICS EST...
Publication number
20220416890
Publication date
Dec 29, 2022
Nippon Telegraph and Telephone Corporation
Takeo SASAI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
SIGNAL PROCESSING APPARATUS, SIGNAL PROCESSING METHOD, AND PROGRAM
Publication number
20220303003
Publication date
Sep 22, 2022
Nippon Telegraph and Telephone Corporation
Kengo HORIKOSHI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
WAVELENGTH DISPERSION COMPENSATION APPARATUS, OPTICAL RECEIVING APP...
Publication number
20220224415
Publication date
Jul 14, 2022
Nippon Telegraph and Telephone Corporation
Masanori NAKAMURA
H03 - BASIC ELECTRONIC CIRCUITRY
Information
Patent Application
WAVELENGTH DISPERSION AMOUNT ESTIMATION APPARATUS
Publication number
20220158731
Publication date
May 19, 2022
Nippon Telegraph and Telephone Corporation
Kengo HORIKOSHI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL RECEIVING APPARATUS AND WAVEFORM DISTORTION COMPENSATION ME...
Publication number
20220094440
Publication date
Mar 24, 2022
Nippon Telegraph and Telephone Corporation
Seiji OKAMOTO
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL TRANSMISSION SYSTEM, OPTICAL RECEIVING APPARATUS AND OPTICA...
Publication number
20220069921
Publication date
Mar 3, 2022
Nippon Telegraph and Telephone Corporation
Akira MASUDA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
WAVELENGTH DISPERSION COMPENSATION APPARATUS, WAVELENGTH DISPERSION...
Publication number
20220038180
Publication date
Feb 3, 2022
Nippon Telegraph and Telephone Corporation
Kyo MINOGUCHI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
COMMUNICATION SYSTEM, OPTICAL TRANSMITTING APPARATUS, AND OPTICAL R...
Publication number
20210384983
Publication date
Dec 9, 2021
Nippon Telegraph and Telephone Corporation
Seiji OKAMOTO
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL TRANSMISSION SYSTEM
Publication number
20210367670
Publication date
Nov 25, 2021
Nippon Telegraph and Telephone Corporation
Shuto YAMAMOTO
H03 - BASIC ELECTRONIC CIRCUITRY
Information
Patent Application
OPTICAL TRANSMISSION SYSTEM, OPTICAL TRANSMITTING APPARATUS, AND OP...
Publication number
20210367675
Publication date
Nov 25, 2021
Nippon Telegraph and Telephone Corporation
Masanori NAKAMURA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL TRANSMISSION SYSTEM AND TRANSMISSION MODE SELECTING METHOD
Publication number
20210314067
Publication date
Oct 7, 2021
Nippon Telegraph and Telephone Corporation
Tetsuro Inui
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
DIGITAL COHERENT RECEIVER AND DIGITAL COHERENT RECEIVING METHOD
Publication number
20210218476
Publication date
Jul 15, 2021
Nippon Telegraph and Telephone Corporation
Akira MASUDA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
RECEIVING APPARATUS AND RECEIVING METHOD
Publication number
20210218471
Publication date
Jul 15, 2021
Nippon Telegraph and Telephone Corporation
Seiji OKAMOTO
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL TRANSMISSION CONTROL METHOD AND OPTICAL TRANSMISSION SYSTEM
Publication number
20210211218
Publication date
Jul 8, 2021
Nippon Telegraph and Telephone Corporation
Fukutaro HAMAOKA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
SIGNAL PROCESSING APPARATUS AND SIGNAL PROCESSING METHOD
Publication number
20210203363
Publication date
Jul 1, 2021
Nippon Telegraph and Telephone Corporation
Seiji OKAMOTO
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL TRANSMISSION SYSTEM AND COMMUNICATION CONDITION SELECTION M...
Publication number
20210028857
Publication date
Jan 28, 2021
Nippon Telegraph and Telephone Corporation
Fumikazu INUZUKA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
STATE ESTIMATING DEVICE AND COMMUNICATION SYSTEM
Publication number
20210013963
Publication date
Jan 14, 2021
Nippon Telegraph and Telephone Corporation
Seiki KUWABARA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL RECEIVER, OPTICAL RECEPTION METHOD, AND OPTICAL COMMUNICATI...
Publication number
20200052793
Publication date
Feb 13, 2020
Nippon Telegraph and Telephone Corporation
Fukutaro HAMAOKA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
SIGNAL-TO-NOISE RATIO ESTIMATION METHOD, OPTICAL TRANSMISSION APPAR...
Publication number
20200028586
Publication date
Jan 23, 2020
Nippon Telegraph and Telephone Corporation
Seiji OKAMOTO
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL TRANSMITTER, OPTICAL RECEIVER, OPTICAL DATA TRANSMISSION SY...
Publication number
20190273560
Publication date
Sep 5, 2019
Nippon Telegraph and Telephone Corporation
Kengo HORIKOSHI
H04 - ELECTRIC COMMUNICATION TECHNIQUE