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Masamichi Fujiwara
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Yokosuka-shi, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Optical feeding system
Patent number
12,206,461
Issue date
Jan 21, 2025
Nippon Telegraph and Telephone Corporation
Ryo Igarashi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Light leakage confirmation method, light leakage confirmation appar...
Patent number
12,199,664
Issue date
Jan 14, 2025
Nippon Telegraph and Telephone Corporation
Ryo Igarashi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical receiver and optical receiving method
Patent number
12,166,532
Issue date
Dec 10, 2024
Nippon Telegraph and Telephone Corporation
Masamichi Fujiwara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Branch ratio setting system, method for producing optical communica...
Patent number
12,143,157
Issue date
Nov 12, 2024
Nippon Telegraph and Telephone Corporation
Ryo Igarashi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical amplification estimation method, optical amplification esti...
Patent number
12,119,869
Issue date
Oct 15, 2024
Nippon Telegraph and Telephone Corporation
Ryo Igarashi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Communication apparatus and communication method
Patent number
11,956,098
Issue date
Apr 9, 2024
Nippon Telegraph and Telephone Corporation
Noriko Iiyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical receiving apparatus, optical transmission system, optical t...
Patent number
11,870,497
Issue date
Jan 9, 2024
Nippon Telegraph and Telephone Corporation
Ryo Igarashi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical communication system and optical communication method
Patent number
11,863,211
Issue date
Jan 2, 2024
Nippon Telegraph and Telephone Corporation
Ryo Igarashi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical receiving apparatus, optical transmission system, optical t...
Patent number
11,652,554
Issue date
May 16, 2023
Nippon Telegraph and Telephone Corporation
Ryo Igarashi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical communication system and optical communication method
Patent number
11,621,778
Issue date
Apr 4, 2023
Nippon Telegraph and Telephone Corporation
Masamichi Fujiwara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Signal processing apparatus and optical receiver
Patent number
11,595,132
Issue date
Feb 28, 2023
Nippon Telegraph and Telephone Corporation
Noriko Iiyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Signal processing apparatus and optical receiving apparatus
Patent number
11,539,437
Issue date
Dec 27, 2022
Nippon Telegraph and Telephone Corporation
Noriko Iiyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical receiving apparatus, optical transmitting apparatus, and fr...
Patent number
11,451,305
Issue date
Sep 20, 2022
Nippon Telegraph and Telephone Corporation
Ryo Igarashi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical coupling/splitting device, two-way optical propagation devi...
Patent number
9,306,670
Issue date
Apr 5, 2016
Nippon Telegraph and Telephone Corporation
Masamichi Fujiwara
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 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
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
Multi-wavelength generating method and apparatus based on flattenin...
Patent number
7,068,412
Issue date
Jun 27, 2006
Nippon Telegraph & Telephone Corp.
Masamichi Fujiwara
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
Multi-wavelength generating method and apparatus based on flattenin...
Patent number
6,924,924
Issue date
Aug 2, 2005
Nippon Telegraph and Telephone Corporation
Masamichi Fujiwara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Multi-wavelength generating method and apparatus based on flattenin...
Patent number
6,831,774
Issue date
Dec 14, 2004
Nippon Telegraph and Telephone Corporation
Masamichi Fujiwara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Light generation method and light source
Patent number
6,359,724
Issue date
Mar 19, 2002
Nippon Telegraph and Telephone Corporation
Yoshitada Katagiri
H01 - BASIC ELECTRIC ELEMENTS
Patents Applications
last 30 patents
Information
Patent Application
COHERENT OPTICAL RECEPTION DEVICE AND COHERENT OPTICAL RECEPTION ME...
Publication number
20240031035
Publication date
Jan 25, 2024
Nippon Telegraph and Telephone Corporation
Ryo IGARASHI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
COHERENT OPTICAL RECEPTION DEVICE AND COHERENT OPTICAL RECEPTION ME...
Publication number
20230344522
Publication date
Oct 26, 2023
Nippon Telegraph and Telephone Corporation
Ryo IGARASHI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL TRANSMITTER, OPTICAL ACCESS SYSTEM, AND OPTICAL TRANSMISSIO...
Publication number
20230308175
Publication date
Sep 28, 2023
Nippon Telegraph and Telephone Corporation
Masamichi FUJIWARA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL FEEDING SYSTEM
Publication number
20230308189
Publication date
Sep 28, 2023
Nippon Telegraph and Telephone Corporation
Ryo IGARASHI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL ACCESS SYSTEM, OPTICAL TRANSMITTER, OPTICAL RECEIVER, OPTIC...
Publication number
20230299848
Publication date
Sep 21, 2023
Nippon Telegraph and Telephone Corporation
Masamichi FUJIWARA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
BRANCH RATIO SETTING SYSTEM, METHOD FOR PRODUCING OPTICAL COMMUNICA...
Publication number
20230291484
Publication date
Sep 14, 2023
Nippon Telegraph and Telephone Corporation
Ryo IGARASHI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
BRANCH RATIO CALCULATION METHOD, BRANCH RATIO CALCULATION DEVICE AN...
Publication number
20230261750
Publication date
Aug 17, 2023
Nippon Telegraph and Telephone Corporation
Ryo IGARASHI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
COMMUNICATION APPARATUS AND COMMUNICATION METHOD
Publication number
20230246876
Publication date
Aug 3, 2023
Nippon Telegraph and Telephone Corporation
Noriko IIYAMA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL AMPLIFICATION ESTIMATION METHOD, OPTICAL AMPLIFICATION ESTI...
Publication number
20230224034
Publication date
Jul 13, 2023
Nippon Telegraph and Telephone Corporation
Ryo IGARASHI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL RECEIVER AND OPTICAL RECEIVING METHOD
Publication number
20230208530
Publication date
Jun 29, 2023
Nippon Telegraph and Telephone Corporation
Masamichi FUJIWARA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
LIGHT LEAKAGE CONFIRMATION METHOD, LIGHT LEAKAGE CONFIRMATION APPAR...
Publication number
20230188208
Publication date
Jun 15, 2023
Nippon Telegraph and Telephone Corporation
Ryo IGARASHI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL COMMUNICATION SYSTEM AND OPTICAL COMMUNICATION METHOD
Publication number
20230163852
Publication date
May 25, 2023
Nippon Telegraph and Telephone Corporation
Ryo IGARASHI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL RECEIVING APPARATUS, OPTICAL TRANSMISSION SYSTEM, OPTICAL T...
Publication number
20220368427
Publication date
Nov 17, 2022
Nippon Telegraph and Telephone Corporation
Ryo IGARASHI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL RECEIVING APPARATUS, OPTICAL TRANSMISSION SYSTEM, OPTICAL T...
Publication number
20220368428
Publication date
Nov 17, 2022
Nippon Telegraph and Telephone Corporation
Ryo IGARASHI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL COMMUNICATION SYSTEM AND OPTICAL COMMUNICATION METHOD
Publication number
20220239375
Publication date
Jul 28, 2022
Nippon Telegraph and Telephone Corporation
Masamichi FUJIWARA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL RECEIVING APPARATUS, OPTICAL TRANSMITTING APPARATUS, AND FR...
Publication number
20210399809
Publication date
Dec 23, 2021
Nippon Telegraph and Telephone Corporation
Ryo IGARASHI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
SIGNAL PROCESSING APPARATUS AND OPTICAL RECEIVER
Publication number
20210336706
Publication date
Oct 28, 2021
Nippon Telegraph and Telephone Corporation
Noriko IIYAMA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
SIGNAL PROCESSING APPARATUS AND OPTICAL RECEIVING APPARATUS
Publication number
20210258075
Publication date
Aug 19, 2021
Nippon Telegraph and Telephone Corporation
Noriko IIYAMA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
LIGHT MERGING/BRANCHING DEVICE, BIDIRECTIONAL LIGHT PROPAGATION DEV...
Publication number
20140186040
Publication date
Jul 3, 2014
Masamichi Fujiwara
G02 - OPTICS
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
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
Multi-wavelength generating method and apparatus based on flattenin...
Publication number
20050008373
Publication date
Jan 13, 2005
Nippon Telegraph and Telephone Corp.
Masamichi Fujiwara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Multi-wavelength generating method and apparatus based on flattenin...
Publication number
20040100682
Publication date
May 27, 2004
Nippon Telegraph and Telephone Corp.
Masamichi Fujiwara
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
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
Multi-wavelength generating method and apparatus based on flattenin...
Publication number
20020015212
Publication date
Feb 7, 2002
Masamichi Fujiwara
G02 - OPTICS