The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 01, 2017
Filed:
Feb. 01, 2016
Fujitsu Limited, Kawasaki-shi, Kanagawa, JP;
Taku Saito, Kawasaki, JP;
Kosuke Komaki, Kawasaki, JP;
Taketo Endo, Kawasaki, JP;
Shuzo Matsushita, Kawasaki, JP;
Hirofumi Araki, Kawasaki, JP;
Hiroshi Nishida, Kawasaki, JP;
Makoto Shimizu, Oyama, JP;
FUJITSU LIMITED, Kawasaki, JP;
Abstract
An optical transmission apparatus includes: an optical receiver configured to receive an optical signal; a variable optical attenuator configured to adjust a power of the optical signal to be input to the optical receiver according to a variable attenuation amount; and a controller configured to control the attenuation amount of the variable optical attenuator based on an electrical signal obtained by performing a coherent detection and a photoelectric conversion on the optical signal received by the optical receiver.