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. 12, 2008
Filed:
Mar. 19, 2004
Takashi Sato, Yokohama, JP;
Kazunari Tsubaki, Kawasaki, JP;
Tomoaki Takeyama, Kawasaki, JP;
Keiko Sasaki, Kawasaki, JP;
Shinya Inagaki, Kawasaki, JP;
Takashi Sato, Yokohama, JP;
Kazunari Tsubaki, Kawasaki, JP;
Tomoaki Takeyama, Kawasaki, JP;
Keiko Sasaki, Kawasaki, JP;
Shinya Inagaki, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A wavelength division multiplexed optical amplifier, enabling elimination of the problems of oscillation and fluctuation in output due to ASE at the time of a rapid change in the number of input wavelengths, provided with a first-stage optical amplifying unit, second-stage optical amplifying unit, a common AGC circuit for common AGC of the first and second optical amplifying units, and a pumping light distribution means for applying pumping light to the first and second-stage optical amplifying units with a predetermined distribution ratio.