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. 15, 1994
Filed:
Mar. 01, 1993
Applicant:
Inventor:
Kenichi Yoneyama, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04J / ;
U.S. Cl.
CPC ...
359333 ; 359337 ; 359110 ;
Abstract
An optical amplifying apparatus of the present invention has an optical amplifier for directly amplifying an input signal, and an optical splitter for reflecting a noise light which occurs in the amplifier and is supplied backward therefrom. An amount of the backward noise light is used to detect an S/N ratio of an output light or the like.