Wdm optical network with passive pass-through at each node

Details Wdm optical network with passive pass-through at each node Wdm optical network with passive pass-through at each node

H - Electricity

04

J

H04J 14/02 (2006.01) H04B 10/20 (2006.01) H04L 12/56 (2006.01)

Patent

CA 2412276

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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