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. 12, 2004
Filed:
Oct. 04, 2001
Applicant:
Inventors:
Motoki Kakui, Yokohama, JP;
Masahiro Takagi, Yokohama, JP;
Assignee:
Sumitomo Electric Industries, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01S 3/00 ;
U.S. Cl.
CPC ...
H01S 3/00 ;
Abstract
This invention relates to an optical amplification fiber having a structure capable of exhibiting an excellent amplification characteristics, and the like. In the optical amplification fiber, the ratio (&agr; /&agr; ) of an unsaturated absorption peak value &agr; in a pumping light wavelength band of 0.98 &mgr;m to an unsaturated absorption peak value &agr; in a signal wavelength band of 1.55 &mgr;m is 0.8 or more and, more preferably, 0.9 or more.