Add/drop node for an optical communications network

H - Electricity – 04 – J

Patent

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H04J 14/02 (2006.01)

Patent

CA 2475858

A 1550nm DWDM optical communications network has a 1300nm remote node added to which a small number of channels can be added or dropped. The additional node includes dual wavelength couplers to enable 1300nm wavelength signals to be added or dropped. The 1300nm signals are demultiplexed using a WDM filter and connected into the transponders of the 1550nm nodes for transportation around the node. Signals for the remote network are converted to 1300nm signals at the 1550nm node transponders and multiplexed onto the network to be dropped to the network node transponder.

Selon cette invention, un réseau de communications optiques à multiplexage en longueur d'onde dense de 1550 nm possède un noeud additionnel hors site 1300 nm à partir duquel il est possible d'ajouter ou d'abandonner un petit nombre de canaux. Le noeud additionnel comprend des coupleurs bifréquence permettant d'ajouter ou d'abandonner des signaux de 1300 nm. Une fois que les signaux de 1300 nm sont démultiplexés au moyen d'un filtre de multiplexage en longueur d'onde, ils sont raccrochés dans les transpondeurs des noeuds 1550 nm en vue d'un transport contournant le noeud. Les signaux du réseau hors site sont abaissés à la fréquence de 1300 nm au niveau des transpondeurs du noeud 1550 nm et raccrochés par multiplexage sur le réseau de façon à être abandonnés au transpondeur du noeud du réseau.

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