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Hiroki Kawahara
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Musashino-shi, Tokyo, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Wavelength cross connect device and wavelength cross connect method
Patent number
11,979,226
Issue date
May 7, 2024
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Cyclic wavelength band replacement device, multi-band transmission...
Patent number
11,824,583
Issue date
Nov 21, 2023
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical cross-connect device, optical transmission system, and opti...
Patent number
11,812,205
Issue date
Nov 7, 2023
Nippon Telegraph and Telephone Corporation
Masatoshi Namiki
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Wavelength cross connect device and cross connect connection method
Patent number
11,750,317
Issue date
Sep 5, 2023
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical branch insertion device and optical branch insertion method
Patent number
11,722,235
Issue date
Aug 8, 2023
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical transmission system and optical transmission method
Patent number
11,696,056
Issue date
Jul 4, 2023
Nippon Telegraph and Telephone Corporation
Hiroto Takechi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Wavelength cross connect device, branch ratio variable method, and...
Patent number
11,677,489
Issue date
Jun 13, 2023
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical transmission system and failure diagnosis method for optica...
Patent number
11,528,080
Issue date
Dec 13, 2022
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
OSNR spectrum estimation apparatus, OSNR spectrum estimation method...
Patent number
11,424,824
Issue date
Aug 23, 2022
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Wiring management system and wiring management method
Patent number
11,362,894
Issue date
Jun 14, 2022
Nippon Telegraph and Telephone Corporation
Yoshihiko Uematsu
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical transmission system and optical transmission method
Patent number
11,265,628
Issue date
Mar 1, 2022
Nippon Telegraph and Telephone Corporation
Katsuhiro Araya
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical reception device
Patent number
11,251,877
Issue date
Feb 15, 2022
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Patents Applications
last 30 patents
Information
Patent Application
WAVELENGTH CROSS CONNECT DEVICE, AND WAVELENGTH CROSS CONNECT METHOD
Publication number
20240373152
Publication date
Nov 7, 2024
Nippon Telegraph and Telephone Corporation
Hiroki KAWAHARA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
WAVELENGTH CROSS CONNECT DEVICE, AND WAVELENGTH CROSS CONNECT METHOD
Publication number
20240284079
Publication date
Aug 22, 2024
Nippon Telegraph and Telephone Corporation
Masahiro NAKAGAWA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
WAVELENGTH CROSS CONNECT DEVICE, AND WAVELENGTH CROSS CONNECT METHOD
Publication number
20240283557
Publication date
Aug 22, 2024
Nippon Telegraph and Telephone Corporation
Masahiro NAKAGAWA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
MULTIPATH INTERFERENCE ANALYSIS DEVICE AND MULTIPATH INTERFERENCE A...
Publication number
20240204873
Publication date
Jun 20, 2024
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
WAVELENGTH CROSS CONNECT DEVICE AND WAVELENGTH CROSS CONNECT METHOD
Publication number
20230275667
Publication date
Aug 31, 2023
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
WAVELENGTH CROSS CONNECT DEVICE, MULTIBAND TRANSMISSION SYSTEM, AND...
Publication number
20230275668
Publication date
Aug 31, 2023
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL TRANSMISSION SYSTEM AND DESIGN METHOD FOR OPTICALTRANSMISSI...
Publication number
20230268998
Publication date
Aug 24, 2023
Nippon Telegraph and Telephone Corporation
Kohei SAITO
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL NODE DEVICE, OPTICAL TRANSPORT NETWORK SYSTEM, OPTICAL PATH...
Publication number
20230254611
Publication date
Aug 10, 2023
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
MULTI-CORE FIBER, OPTICAL TRANSMISSION SYSTEM, AND OPTICAL TRANSMIS...
Publication number
20230244025
Publication date
Aug 3, 2023
Nippon Telegraph and Telephone Corporation
Kenta HIROSE
G02 - OPTICS
Information
Patent Application
CYCLIC WAVELENGTH BAND REPLACEMENT DEVICE, MULTI-BAND TRANSMISSION...
Publication number
20230074213
Publication date
Mar 9, 2023
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
WAVELENGTH CROSS CONNECT DEVICE AND WAVELENGTH CROSS CONNECT METHOD
Publication number
20230067932
Publication date
Mar 2, 2023
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL AMPLIFIER, RECEIVER, OPTICAL TRANSMISSION SYSTEM, AND OPTIC...
Publication number
20220416897
Publication date
Dec 29, 2022
Nippon Telegraph and Telephone Corporation
Kohei Saito
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Application
OPTICAL CROSS-CONNECT DEVICE, OPTICAL TRANSMISSION SYSTEM, AND OPTI...
Publication number
20220286762
Publication date
Sep 8, 2022
Nippon Telegraph and Telephone Corporation
Masatoshi Namiki
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
WAVELENGTH CROSS CONNECT DEVICE AND CROSS CONNECT CONNECTION METHOD
Publication number
20220182167
Publication date
Jun 9, 2022
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
WAVELENGTH CROSS CONNECT DEVICE, BRANCH RATIO VARIABLE METHOD, AND...
Publication number
20220182168
Publication date
Jun 9, 2022
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL BRANCH INSERTION DEVICE AND OPTICAL BRANCH INSERTION METHOD
Publication number
20220149970
Publication date
May 12, 2022
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL TRANSMISSION SYSTEM AND OPTICAL TRANSMISSION METHOD
Publication number
20220046341
Publication date
Feb 10, 2022
Nippon Telegraph and Telephone Corporation
Hiroto TAKECHI
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL TRANSMISSION SYSTEM AND FAILURE DIAGNOSIS METHOD FOR OPTICA...
Publication number
20220021449
Publication date
Jan 20, 2022
Nippon Telegraph and Telephone Corporation
Hiroki Kawahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OSNR SPECTRUM ESTIMATION APPARATUS, OSNR SPECTRUM ESTIMATION METHOD...
Publication number
20210351842
Publication date
Nov 11, 2021
Nippon Telegraph and Telephone Corporation
Hiroki KAWAHARA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL TRANSMISSION SYSTEM AND OPTICAL TRANSMISSION METHOD
Publication number
20210321178
Publication date
Oct 14, 2021
Nippon Telegraph and Telephone Corporation
Katsuhiro ARAYA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL CROSS-CONNECT DEVICE
Publication number
20210219031
Publication date
Jul 15, 2021
Nippon Telegraph and Telephone Corporation
Hiroki KAWAHARA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL RECEPTION DEVICE
Publication number
20210218474
Publication date
Jul 15, 2021
Nippon Telegraph and Telephone Corporation
Hiroki KAWAHARA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
WIRING MANAGEMENT SYSTEM AND WIRING MANAGEMENT METHOD
Publication number
20210014585
Publication date
Jan 14, 2021
Nippon Telegraph and Telephone Corporation
Yoshihiko Uematsu
H04 - ELECTRIC COMMUNICATION TECHNIQUE