Optical communications – Multiplex – Broadcast and distribution system
Reexamination Certificate
2007-01-16
2007-01-16
Payne, David C. (Department: 2613)
Optical communications
Multiplex
Broadcast and distribution system
C398S048000, C398S058000, C398S059000, C398S063000, C398S068000
Reexamination Certificate
active
09785402
ABSTRACT:
An optical wavelength division multiplexing network which can carry out large-capacity access service with a simple constitution is provided. In an optical network comprising a plurality of layers, a highest level network comprises a ring network having a center node and remote nodes; an intermediate level network comprises a ring centered around a node belonging to the higher level network, and a lowest level network comprises a star network centered around an access node which multiplexes traffic from a plurality of ONU, the ONU and the access node being directly joined together by optical fibers; the center node belonging to the highest level network and the ONU establish a direct communication path by using lights of different wavelengths; at nodes provided therebetween, the optical signals are not electrically processed but are amplified, branched, and routed.
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Iwatsuki Katsumi
Obara Hitoshi
Takachio Noboru
Krebs Robert E.
Nippon Telegraph and Telephone Corporation
Payne David C.
Thelen Reid & Priest LLP
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