Low loss wdm add drop node

H - Electricity – 04 – J

Patent

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Details

H04J 14/02 (2006.01) H04B 10/213 (2006.01)

Patent

CA 2440395

In an optical fiber network bidirectional WDM traffic is sent on one optical main transmission fiber (1) between two nodes (A, B) connected in the path of the transmission fiber. The bidirectio nal traffic between a pair of nodes is carried on two different wavelength channels (Nos. 1, 2), one for each direction. The twowavelength channels are added to/dropped from the traffic in the ring fiber (1) in each node using a two-channel add/drop filter (5e1-2, 5w1-2), e.g. a band add/drop filter. In this way the num ber of add/drop filters connected in the path of the transmissio n fiber can be kept as small as possible.

Selon la présente invention, dans un réseau de fibres optiques, un trafic MRL bidirectionnel est envoyé sur une fibre (1) optique de transmission principale entre deux noeuds (A, B) connectés dans le conduit de la fibre de transmission. Le trafic bidirectionnel entre deux noeuds est acheminé sur deux canaux de longueurs d'ondes différentes (1, 2), à savoir un pour chaque sens. Ces deux canaux de longueurs d'ondes sont ajoutés au trafic ou retirés du trafic dans la fibre (1) annulaire dans chaque noeud au moyen d'un filtre ajout/retrait à deux canaux (5e1-2, 5W1-2), par exemple un filtre ajout/retrait à bande. Ainsi, le nombre de filtres ajout/retrait connectés dans le conduit de la fibre de transmission peut être maintenu à un niveau le plus bas possible.

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