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:
Feb. 22, 2005
Filed:
Dec. 04, 2003
Junya Kosaka, Fujisawa, JP;
Junya Kosaka, Fujisawa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An optical amplifier which amplifies a multiplexed signal light which is multiplexed with a plurality of signals having different wavelengths. The optical amplifier includes an optical amplifying medium which amplifies the multiplexed signal light and outputs amplified multiplexed signal light, a first light separator which separates light having a specific wavelength from at least a part of the multiplexed signal light output from the optical amplifying medium, a first light receiver which inputs the light having the specific wavelength separated by the first light separator and measures a strength of the specific wavelength light, and a controller which controls an output of the optical amplifying medium such that the strength of the specific wavelength light becomes a first predetermined value.