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. 26, 2008
Filed:
Jun. 28, 2005
Miki Onaka, Kawasaki, JP;
Yasushi Sugaya, Kawasaki, JP;
Etsuko Hayashi, Kawasaki, JP;
Norifumi Shukunami, Sapporo, JP;
Manabu Watanabe, Sapporo, JP;
Miki Onaka, Kawasaki, JP;
Yasushi Sugaya, Kawasaki, JP;
Etsuko Hayashi, Kawasaki, JP;
Norifumi Shukunami, Sapporo, JP;
Manabu Watanabe, Sapporo, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
Multi-wavelength light is inputted to an erbium-doped fiber as an optical amplification medium. Pump light is supplied to this erbium-doped fiber. When a transition from a state signal light on the short wavelength area in the multi-wavelength is input in the erbium-doped fiber to a state the signal light is not input, the output power of signal light on the long wavelength area in the multi-wavelength light can vary. The wavelength of pump light is selected in such a way that the output power of the signal light on the long wavelength area can not be negative when the power varies.