Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2005-05-10
2005-05-10
Negash, Kinfe-Michael (Department: 2633)
Optical communications
Multiplex
Wavelength division or frequency division
C398S003000, C398S050000, C398S059000, C398S068000, C398S083000, C398S084000, C398S085000
Reexamination Certificate
active
06892032
ABSTRACT:
A communications network has a plurality of nodes interconnected by an optical transmission medium. The transmission medium is capable of a carrying a plurality of wavelengths organized into bands. A filter at each node for drops a band associated therewith and passively forwards other bands through the transmission medium. A device is provided at each node for adding a band to the transmission medium. Communication can be established directly between a pair of nodes in the network sharing a common band without the active intervention of any intervening node. This allows the network to be protocol independent. Also, the low losses incurred by the passive filters permit relatively long path lengths without optical amplification.
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Liu Kexing
Milton David
Pigeon Michel
Totti Gino
Valis Tomas
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