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:
Mar. 31, 2009
Filed:
Oct. 31, 2007
Applicants:
Ryo Kawahara, Tokyo, JP;
Masaru Fukushima, Tokyo, JP;
Nobuyuki Kagi, Tokyo, JP;
Kensaku Sekiya, Tokyo, JP;
Inventors:
Ryo Kawahara, Tokyo, JP;
Masaru Fukushima, Tokyo, JP;
Nobuyuki Kagi, Tokyo, JP;
Kensaku Sekiya, Tokyo, JP;
Assignee:
The Furukawa Electric Co., Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B 10/17 (2006.01);
U.S. Cl.
CPC ...
Abstract
A proportional constant adjusting circuit is arranged in the AGC circuit of the optical amplifying apparatus, and the proportional constant of the proportional circuit is continuously adjusted in correspondence to the optical input power monitored by the PD and the logarithmic transformation circuit. The AGC circuit controls the pump LD based on the monitored optical input/output power so as to control the gain of the optical amplifier to be a requested value.