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:
Jul. 09, 1996
Filed:
Nov. 29, 1994
Applicant:
Inventor:
Kenichi Yoneyama, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B / ; H04B / ;
U.S. Cl.
CPC ...
359177 ; 359179 ; 359110 ;
Abstract
From a terminal station, a monitoring information is transmitted superimposing on a primary signal. An optical repeater transmits a residual light of an excited light by exciting an erbium doped optical fiber by an exciting light source, in a direction opposite to said primary signal. Therefore, in the optical repeater, when a monitoring information is detected, a response signal to a terminal station is generated. The response signal is transmitted to upstream side by optical modulation of the exciting light source by the response signal.