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. 09, 2006
Filed:
Mar. 14, 2003
Applicants:
Shinichi Aozasa, Isehara, JP;
Hiroji Masuda, Mito, JP;
Makoto Shimizu, Mito, JP;
Inventors:
Assignee:
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B 10/12 (2006.01);
U.S. Cl.
CPC ...
Abstract
An optical amplifier capable of holding the gain profile of the optical amplifier constant includcs a rare-earth doped optical waveguide serving as an amplification medium, a pump light source for exciting the amplification medium, one or more control light source, a monitor, and a control unit. A control method is also provided for using the amplifier for holding the gain profile of the optical amplifier constant by, for example, controlling the control light source so that the calculated gain is matched with a prescribed value or an externally decided value.