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. 04, 2003
Filed:
Sep. 24, 1999
Michael W. Rowan, Los Gatos, CA (US);
David B. Upham, Sunnyvale, CA (US);
Augustus Elmer, San Jose, CA (US);
Laurence J. Newell, Saratoga, CA (US);
David A. Pechner, San Jose, CA (US);
Abraham Kou, San Jose, CA (US);
James F. Coward, La Honda, CA (US);
Norman L. Swenson, Mountain View, CA (US);
Minnie Ho, Palo Alto, CA (US);
Peter H. Chang, San Jose, CA (US);
Ting K. Yee, Foster City, CA (US);
Stuart E. Wilson, Menlo Park, CA (US);
Kestrel Solutions, Inc., Mountain View, CA (US);
Abstract
A frequency division multiplexing (FDM) node used in optical communications networks provides add-drop multiplexing (ADM) functionality between optical high-speed channels and electrical low-speed channels. The FDM node includes a high-speed system and an ADM crosspoint. The high-speed system converts between an optical high-speed channel and its constituent electrical low-speed channels through the use of frequency division multiplexing and preferably also QAM modulation. The ADM crosspoint couples incoming low-speed channels to outgoing low-speed channels, thus implementing the ADM functionality for the FDM node.