Optical communications – Fault recovery – Bypass inoperative element
Reexamination Certificate
2006-10-12
2008-10-07
Vanderpuye, Kenneth (Department: 2613)
Optical communications
Fault recovery
Bypass inoperative element
C398S005000, C398S048000, C398S058000, C398S059000, C398S063000, C398S068000, C398S070000
Reexamination Certificate
active
07433594
ABSTRACT:
An optical wavelength division multiplexing network has a multi-level structure where a plurality of optical network units (ONUs) are connected to a lowest-level network. A node apparatus connected to networks other than the lowest-level network includes (a) passive optical components to branch optical signals from a higher-level network to a lower-level network, and couple optical signals from the lower-level network to the higher-level network, and (b) optical amplifiers for the optical signals. A node apparatus connected to the lowest-level network includes (a) an optical multiplexer/de-multiplexer to de-multiplex optical signals from the higher-level network, selectively output an optical signal to each ONU, and multiplex wave-length specific optical signals from the ONUs into a multiplexed optical signal, and (b) optical amplifiers for the optical signals. The node apparatuses provide an optical communication path between the higher-level network and the lower-level (or lowest-level) network without converting the optical signals into electrical signals.
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Iwatsuki Katsumi
Obara Hitoshi
Takachio Noboru
Liu Li
Nippon Telegraph and Telephone Corporation
Thelen Reid Brown Raysman & Steiner LLP
Vanderpuye Kenneth
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