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Yoshiaki KISAKA
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Yokosuka-shi, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Optical transmission system, control apparatus, optical transmissio...
Patent number
12,184,337
Issue date
Dec 31, 2024
Nippon Telegraph and Telephone Corporation
Shuto Yamamoto
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical transmission system and characteristic estimation method
Patent number
11,901,953
Issue date
Feb 13, 2024
Nippon Telegraph and Telephone Corporation
Takeo Sasai
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
S/N ratio estimation circuit, and adaptive filter circuit
Patent number
11,870,489
Issue date
Jan 9, 2024
Nippon Telegraph and Telephone Corporation
Masanori Nakamura
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical transmission system, optical transmitting apparatus and opt...
Patent number
11,855,699
Issue date
Dec 26, 2023
Nippon Telegraph and Telephone Corporation
Shuto Yamamoto
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Bias voltage adjustment apparatus and IQ optical modulation system
Patent number
11,822,161
Issue date
Nov 21, 2023
Nippon Telegraph and Telephone Corporation
Hiroto Kawakami
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Synchronous detection apparatus, synchronous detection method, and...
Patent number
11,711,198
Issue date
Jul 25, 2023
Nippon Telegraph and Telephone Corporation
Hiroto Kawakami
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical transmission system and compensation method
Patent number
11,711,151
Issue date
Jul 25, 2023
Nippon Telegraph and Telephone Corporation
Asuka Matsushita
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Symbol judgement apparatus and symbol judgement method
Patent number
11,706,065
Issue date
Jul 18, 2023
Nippon Telegraph and Telephone Corporation
Hiroki Taniguchi
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
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
Patent number
11,444,694
Issue date
Sep 13, 2022
Nippon Telegraph and Telephone Corporation
Shuto Yamamoto
H03 - BASIC ELECTRONIC CIRCUITRY
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
Automatic bias control circuit
Patent number
11,397,363
Issue date
Jul 26, 2022
Nippon Telegraph and Telephone Corporation
Hiroto Kawakami
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
Error correction device, error correction method, and optical commu...
Patent number
11,329,764
Issue date
May 10, 2022
NTT Electronics Corporation
Fumiaki Nakagawa
H03 - BASIC ELECTRONIC CIRCUITRY
Information
Patent Grant
Frame synchronization apparatus, optical communication apparatus, a...
Patent number
11,323,238
Issue date
May 3, 2022
NTT Electronics Corporation
Mitsuteru Yoshida
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
Optical transmission system
Patent number
11,251,870
Issue date
Feb 15, 2022
Nippon Telegraph and Telephone Corporation
Etsushi Yamazaki
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
Frame synchronization apparatus, optical communication apparatus, a...
Patent number
11,201,721
Issue date
Dec 14, 2021
NTT Electronics Corporation
Mitsuteru Yoshida
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Chromatic dispersion compensation device, chromatic dispersion comp...
Patent number
10,868,617
Issue date
Dec 15, 2020
NTT Electronics Corporation
Mitsuteru Yoshida
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
Transmission characteristic compensation apparatus, transmission ch...
Patent number
10,608,743
Issue date
Mar 31, 2020
NTT Electronics Corporation
Tomohiro Takamuku
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Patents Applications
last 30 patents
Information
Patent Application
ESTIMATION METHOD, OPTICAL RECEIVING APPARATUS, AND COMPUTER PROGRAM
Publication number
20250038860
Publication date
Jan 30, 2025
Nippon Telegraph and Telephone Corporation
Kyo MINOGUCHI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL TRANSMISSION SYSTEM, TRANSMISSION APPARATUS, RECEIVING APPA...
Publication number
20240283544
Publication date
Aug 22, 2024
Nippon Telegraph and Telephone Corporation
Masanori NAKAMURA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
SIGNAL PROCESSING APPARATUS, SIGNAL PROCESSING METHOD AND COMMUNICA...
Publication number
20240267129
Publication date
Aug 8, 2024
Nippon Telegraph and Telephone Corporation
Masanori NAKAMURA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Distributed Optical Amplifier, Distributed Optical Amplifier System...
Publication number
20240258760
Publication date
Aug 1, 2024
Nippon Telegraph and Telephone Corporation
Hiroto KAWAKAMI
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Application
OPTICAL SIGNAL CONTROLLER, OPTICAL SIGNAL CONTROL METHOD, AND OPTIC...
Publication number
20240146420
Publication date
May 2, 2024
Nippon Telegraph and Telephone Corporation
Masanori NAKAMURA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
EXCITATION DEVICE FOR OPTICAL AMPLIFIER
Publication number
20240039233
Publication date
Feb 1, 2024
Nippon Telegraph and Telephone Corporation
Hiroto KAWAKAMI
H01 - BASIC ELECTRIC ELEMENTS
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
SYMBOL DETERMINATION DEVICE AND TAP SELECTION METHOD
Publication number
20230361881
Publication date
Nov 9, 2023
Nippon Telegraph and Telephone Corporation
Hiroki TANIGUCHI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL TRANSMISSION SYSTEM, CONTROL APPARATUS, OPTICAL TRANSMISSIO...
Publication number
20230291482
Publication date
Sep 14, 2023
Nippon Telegraph and Telephone Corporation
Shuto YAMAMOTO
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL SIGNAL DEMODULATOR, CONTROL METHOD AND PROGRAM
Publication number
20230261759
Publication date
Aug 17, 2023
Nippon Telegraph and Telephone Corporation
Shuto YAMAMOTO
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL TRANSMISSION SYSTEM AND CHARACTERISTIC ESTIMATION METHOD
Publication number
20230106338
Publication date
Apr 6, 2023
Nippon Telegraph and Telephone Corporation
Takeo SASAI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
S/N RATIO ESTIMATION CIRCUIT, AND ADAPTIVE FILTER CIRCUIT
Publication number
20230097193
Publication date
Mar 30, 2023
Nippon Telegraph and Telephone Corporation
Masanori NAKAMURA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL TRANSMISSION SYSTEM, OPTICAL TRANSMITTING APPARATUS AND OPT...
Publication number
20230071063
Publication date
Mar 9, 2023
Nippon Telegraph and Telephone Corporation
Shuto YAMAMOTO
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
BIAS VOLTAGE ADJUSTMENT APPARATUS AND IQ OPTICAL MODULATION SYSTEM
Publication number
20230004027
Publication date
Jan 5, 2023
Nippon Telegraph and Telephone Corporation
Hiroto KAWAKAMI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
SYNCHRONOUS DETECTION APPARATUS, SYNCHRONOUS DETECTION METHOD, AND...
Publication number
20220263645
Publication date
Aug 18, 2022
Nippon Telegraph and Telephone Corporation
Hiroto KAWAKAMI
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
SYMBOL JUDGEMENT APPARATUS AND SYMBOL JUDGEMENT METHOD
Publication number
20220224575
Publication date
Jul 14, 2022
Nippon Telegraph and Telephone Corporation
Hiroki TANIGUCHI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL TRANSMISSION SYSTEM AND COMPENSATION METHOD
Publication number
20220216923
Publication date
Jul 7, 2022
Nippon Telegraph and Telephone Corporation
Asuka MATSUSHITA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
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
AUTOMATIC BIAS CONTROL CIRCUIT
Publication number
20220043320
Publication date
Feb 10, 2022
Nippon Telegraph and Telephone Corporation
Hiroto KAWAKAMI
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
Publication number
20210367671
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
FRAME SYNCHRONIZATION APPARATUS, OPTICAL COMMUNICATION APPARATUS, A...
Publication number
20210273777
Publication date
Sep 2, 2021
NTT ELECTRONICS CORPORATION
Mitsuteru YOSHIDA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL TRANSMISSION SYSTEM
Publication number
20210242942
Publication date
Aug 5, 2021
Nippon Telegraph and Telephone Corporation
Etsushi YAMAZAKI
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