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Hiroshi Yasaka
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Isehara-shi, JP
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Patents Grants
last 30 patents
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Patent Grant
Semiconductor wavelength conversion device
Patent number
5,155,737
Issue date
Oct 13, 1992
Nippon Telegraph & Telephone Corporation
Masahiro Ikeda
G02 - OPTICS
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Patent Grant
Method and apparatus for stabilizing frequency of semiconductor laser
Patent number
5,025,448
Issue date
Jun 18, 1991
Nippon Telegraph & Telephone Corporation
Shoichi Sudo
G02 - OPTICS
Patents Applications
last 30 patents
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Patent Application
WAVELENGTH TUNABLE DISTRIBUTED BRAGG REFLECTOR (DBR) LASER
Publication number
20070041415
Publication date
Feb 22, 2007
Nippon Telegraph and Telephone Corporation
Naoki Fujiwara
H01 - BASIC ELECTRIC ELEMENTS