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. 23, 2011
Filed:
Sep. 25, 2008
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
The WDM optical transmission system using distributed Raman amplification, before starting operation of main signal light, transfers a plurality of lights having different wavelengths to that of the main signal light (for example Raman amplification pump lights or the like) between first and second optical transmission devices connected to opposite ends of a transmission line, monitors transmission line input and output power for each light, calculates a transmission line loss in each wavelength using the monitor results, and specifies a type of the transmission line based on a loss wavelength characteristic that can be estimated from the calculation result. Then the power of pump light provided to the transmission light is optimized in accordance with the type of transmission line.