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:
Mar. 20, 2012
Filed:
Jan. 28, 2009
Miki Onaka, Kawasaki, JP;
Kiyotoshi Noheji, Kawasaki, JP;
Togo Fukushi, Kawasaki, JP;
Masanori Kondoh, Kawasaki, JP;
Miki Onaka, Kawasaki, JP;
Kiyotoshi Noheji, Kawasaki, JP;
Togo Fukushi, Kawasaki, JP;
Masanori Kondoh, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A light amplifying device including a Raman amplifier to Raman-amplify a signal light by inputting excitation lights of a plurality of wavelengths to a transmission path through which the signal light propagates, a plurality of measuring units measuring powers of light output from the Raman amplifier in a plurality of wavelength bands included in an amplification band of the Raman amplifier, a calculating unit calculating a ratio of the respective powers measured by at least two of the plurality of measuring units, and a control unit controlling a power ratio of the respective excitation lights input to the transmission path by the Raman amplifier based on the ratio calculated by the calculating unit.