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Patents Grants
last 30 patents
Information
Patent Grant
Optical branch insertion device and optical transmission system usi...
Patent number
11,757,554
Issue date
Sep 12, 2023
Nippon Telegraph and Telephone Corporation
Masahiro Nakagawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical branch insertion device and optical transmission system usi...
Patent number
11,742,976
Issue date
Aug 29, 2023
Nippon Telegraph and Telephone Corporation
Masahiro Nakagawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Optical demultiplexer, optical separation device, optical transmiss...
Patent number
11,652,563
Issue date
May 16, 2023
Nippon Telegraph and Telephone Corporation
Kana Masumoto
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Dispersion compensation system and dispersion compensation method
Patent number
11,251,868
Issue date
Feb 15, 2022
Nippon Telegraph and Telephone Corporation
Kana Masumoto
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Patents Applications
last 30 patents
Information
Patent Application
OPTICAL DEMULTIPLEXER, OPTICAL SEPARATION DEVICE, OPTICAL TRANSMISS...
Publication number
20220360355
Publication date
Nov 10, 2022
Nippon Telegraph and Telephone Corporation
Kana Masumoto
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL BRANCH INSERTION DEVICE AND OPTICAL TRANSMISSION SYSTEM USI...
Publication number
20220182169
Publication date
Jun 9, 2022
Nippon Telegraph and Telephone Corporation
Masahiro NAKAGAWA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
OPTICAL BRANCH INSERTION DEVICE AND OPTICAL TRANSMISSION SYSTEM USI...
Publication number
20220149968
Publication date
May 12, 2022
Nippon Telegraph and Telephone Corporation
Masahiro NAKAGAWA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
DISPERSION COMPENSATION SYSTEM AND DISPERSION COMPENSATION METHOD
Publication number
20210266069
Publication date
Aug 26, 2021
Nippon Telegraph and Telephone Corporation
Kana MASUMOTO
H04 - ELECTRIC COMMUNICATION TECHNIQUE