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. 29, 2005
Filed:
Oct. 27, 2000
Andrew Carter, Blisworth Northants, GB;
Rosemary Cush, Northampton, GB;
Andrew Carter, Blisworth Northants, GB;
Rosemary Cush, Northampton, GB;
Marconi LCK Intellectual Property, Ltd., Coventry, GB;
Abstract
An optical add-drop filter for use in a communication system which is capable of communicating both supervisory traffic and communication traffic. Communication traffic is modulated onto first radiation occupying a first range of radiation wavelengths, and supervisory traffic is modulated onto second radiation occupying a second range of radiation wavelengths. When the first and second radiation is received at one or more of the nodes, it is then filtered in the add-drop filters associated therewith to isolate add channels, drop channels, a supervisory channel drop and a supervisory add from primary relatively-low attenuation paths of the filters. The add channels, the drop channels, and the supervisory channel drop and add are then isolated at secondary paths associated with, but not included in the primary paths.