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:
Dec. 20, 2005
Filed:
Dec. 11, 2002
Kosuke Komaki, Kawasaki, JP;
Hiroyuki Itou, Sapporo, JP;
Hiroshi Iizuka, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
The optical amplifier according to the present invention includes a first optical amplifying unit, a second optical amplifying unit, a variable optical attenuator optically connected between the first and second optical amplifying units and a first control unit for controlling the gains of the first and second optical amplifying units according to an input to the first optical amplifying unit and an output from the second optical amplifying unit, and a second control unit for controlling the attenuation of the variable optical attenuator according to an input to and an output from the first optical amplifying unit and an input to and an output from the second optical amplifying unit.