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:
May. 10, 2005
Filed:
Dec. 13, 2001
Applicants:
Yasushi Sugaya, Kawasaki, JP;
Etsuko Hayashi, Yamato, JP;
Terumi Chikama, Zama, JP;
Sinya Inagaki, Shinjuku, JP;
Norifumi Shukunami, Sapporo, JP;
Inventors:
Yasushi Sugaya, Kawasaki, JP;
Etsuko Hayashi, Yamato, JP;
Terumi Chikama, Zama, JP;
Sinya Inagaki, Shinjuku, JP;
Norifumi Shukunami, Sapporo, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01S003/00 ;
U.S. Cl.
CPC ...
Abstract
A rare earth element doped fiber forming an optical amplifier is pumped with a plurality of pumping lights to prevent drop of the inversion population ratio in the length direction of the rare earth element doped fiber.