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:
Oct. 17, 2006
Filed:
Dec. 27, 2005
Shota Mori, Kawasaki, JP;
Maki Hiraizumi, Kawasaki, JP;
Shota Mori, Kawasaki, JP;
Maki Hiraizumi, Kawasaki, JP;
Fujitsu Limited, Kanagawa, JP;
Abstract
An optical amplifier includes an output unit that outputs a loss monitoring light having a wavelength that causes neither absorption nor gain with respect to each of the wavelengths of a light signal to be amplified with EDFs; a multiplexing unit that multiplexes the loss monitoring light with the light signal at an input stage of the light signal; a demultiplexing unit that demultiplexes the loss monitoring light from multiplexed light signal at an output stage of the light signal; a detecting unit that detects intensity of loss monitoring light at the input stage and intensity of loss monitoring light at the output stage; a calculating unit that calculates, based on the intensities, a loss of the loss monitoring light that has occurred between the input stage and the output stage; and a control unit that controls, based on the loss, the variable optical attenuator.