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Tadashi Sakamoto
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Yokosuka, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Swept light source and drive data generation method and optical def...
Patent number
11,721,948
Issue date
Aug 8, 2023
Nippon Telegraph and Telephone Corporation
Masahiro Ueno
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Swept light source and drive data generation method and optical def...
Patent number
11,165,219
Issue date
Nov 2, 2021
Nippon Telegraph and Telephone Corporation
Masahiro Ueno
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Swept light source and method for controlling the same
Patent number
10,205,296
Issue date
Feb 12, 2019
Nippon Telegraph and Telephone Corporation
Seiji Toyoda
G01 - MEASURING TESTING
Information
Patent Grant
Fiber laser, spontaneous emission light source and optical fiber am...
Patent number
7,313,306
Issue date
Dec 25, 2007
Nippon Telegraph and Telephone Corporation
Makoto Yamada
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Wavelength division multiplex optical transmission system
Patent number
7,003,226
Issue date
Feb 21, 2006
Nippon Telegraph and Telephone Corporation
Tadashi Sakamoto
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Thulium-doped fiber amplifier using pump light for improving conver...
Patent number
6,721,092
Issue date
Apr 13, 2004
Nippon Telegraph and Telephone Corporation
Shinichi Aozasa
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Wavelength division multiplexing optical transmission system
Patent number
6,490,064
Issue date
Dec 3, 2002
Nippon Telegraph and Telephone Corporation
Tadashi Sakamoto
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Fluoride glass fiber
Patent number
5,774,620
Issue date
Jun 30, 1998
Nippon Telegraph & Telephone Corporation
Yoshiki Nishida
C03 - GLASS MINERAL OR SLAG WOOL
Information
Patent Grant
Optical fibers for optical amplifiers
Patent number
5,668,659
Issue date
Sep 16, 1997
Nippon Telegraph & Telephone Corporation
Tadashi Sakamoto
H01 - BASIC ELECTRIC ELEMENTS
Patents Applications
last 30 patents
Information
Patent Application
Swept Light Source and Drive Data Generation Method and Optical Def...
Publication number
20210408755
Publication date
Dec 30, 2021
Nippon Telegraph and Telephone Corporation
Masahiro UENO
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Application
Swept Light Source and Drive Data Generation Method and Optical Def...
Publication number
20200076154
Publication date
Mar 5, 2020
Nippon Telegraph and Telephone Corporation
Masahiro Ueo
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Application
SWEPT LIGHT SOURCE AND METHOD FOR CONTROLLING THE SAME
Publication number
20170358899
Publication date
Dec 14, 2017
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Seiji TOYODA
G01 - MEASURING TESTING
Information
Patent Application
Optical Transmission System
Publication number
20080226298
Publication date
Sep 18, 2008
Nippon Telegraph and Telephone Corporation
Hiroyuki Fukuyama
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Fiber laser, spontaneous emission light source and optical fiber am...
Publication number
20060050367
Publication date
Mar 9, 2006
Makoto Yamada
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Application
Thulium-doped fiber amplifier using pump light for improving conver...
Publication number
20020159137
Publication date
Oct 31, 2002
Shinichi Aozasa
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Application
Wavelength division multiplex optical transmission system
Publication number
20020067525
Publication date
Jun 6, 2002
Tadashi Sakamoto
H04 - ELECTRIC COMMUNICATION TECHNIQUE