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:
Nov. 03, 2009
Filed:
Aug. 13, 2003
Kaoru Usui, Kawasaki, JP;
Yoshio Shimano, Kawasaki, JP;
Hiroshi Iizuka, Kawasaki, JP;
Hiroyuki Itou, Sapporo, JP;
Kaoru Usui, Kawasaki, JP;
Yoshio Shimano, Kawasaki, JP;
Hiroshi Iizuka, Kawasaki, JP;
Hiroyuki Itou, Sapporo, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A photo amplifying apparatus for amplifying wavelength division multiplexed signals includes a specific wavelength measuring unit for measuring a specific wavelength at a measuring point, a total power measuring unit for measuring all wavelengths at the measuring point, and an output control unit for controlling the output of the photo amplifying apparatus based on the light power measured by the specific wavelength measuring unit and the total power measuring unit. Since the photo amplifying apparatus measures both the specific wavelength and all wavelengths, the photo amplifying apparatus can determine change in the number of multiplexed wavelengths and the gain gradient of the photo signals, and can properly control its output level.