US Patent:
20030210909, Nov 13, 2003
Inventors:
Michael Rowan - Los Gatos CA, US
David Upham - Sunnyvale CA, US
Augustus Elmer - San Jose CA, US
Laurence Newell - Saratoga CA, US
David Pechner - San Jose CA, US
Abraham Kou - San Jose CA, US
James Coward - La Honda CA, US
Norman Swenson - Mountain View CA, US
Minnie Ho - Palo Alto CA, US
Peter Chang - San Jose CA, US
Ting Yee - Foster City CA, US
Stuart Wilson - Menlo Park CA, US
International Classification:
H04J014/00
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.