Optical communications – Multiplex – Optical local area network
Reexamination Certificate
2008-09-10
2011-11-22
Ben, Loha (Department: 2873)
Optical communications
Multiplex
Optical local area network
C398S082000, C398S070000, C398S079000, C398S048000, C398S083000, C370S498000
Reexamination Certificate
active
08064766
ABSTRACT:
A fiber optic network transmits data between a hub node and a plurality of local nodes connected by at least one unidirectional fiber ring. Downstream data streams are carried on wavelength-division-multiplexed optical carriers from the hub node to the local nodes. An optical carrier corresponding to a specific wavelength carries downstream data streams to a specific local node. Downstream data streams are multiplexed onto an optical carrier via orthogonal frequency division multiplexing. A parallel signal detector in each local node detects all downstream optical carriers. A signal processing module demultiplexes the data stream from the optical carrier having the specific wavelength corresponding to the local node. An upstream data stream is multiplexed via orthogonal frequency division multiplexing onto an upstream optical carrier having the same specific wavelength and transmitted from the local node to the hub node. Upstream data awaiting transmission is allocated to specific subcarriers and time slots.
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Wang Ting
Wei Wei
Ben Loha
Kolodka Joseph
NEC Laboratories America, Inc.
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