Ring network for transmitting wavelength-multiplexed informations

Claim 1

Ring network intended for the transmission of informations in optical form and which are wavelength multiplexed, said network incorporating optically interconnected nodes (N1, N2, N3, N4) and being characterized in that it also comprises: a first optical fibre (F1) forming a ring, which successively passes through the nodes of the network and which is to be traversed by the informations in a first direction, a second optical fibre (F2) forming a ring and which passes successively through the nodes of the network and which is traversed by the informations in a second direction opposite to the first direction, electronic add-drop multiplexers (ME1, ME2, ME3, ME4), known as ADM, each ADM being able to supply informations to other ADM's of the network, respectively at given wavelengths, each ADM incorporating: a first aggregate interface (E) for the transmission of informations to be added in the first fibre (F1) in the direction of an associated ADM and the reception of informations dropped from the second fibre (F2) and coming from the said associated ADM, and a second aggregate interface (0) for the transmission of informations to be added in the second fibre (F2), in the direction of another associated ADM and for the reception of informations dropped from the first fibre (F1) and coming from said associated other ADM, optical add-drop multiplexers (M01, M02, M03, M04) known as OADM's, respectively associated with the ADM's, each OADM being able to add to the first and second fibres the informations coming from the associated ADM and drop from said fibres the informations intended for said associated ADM and means (G) for managing the network, a configuration of the network defining a bidirectional link between an interface of each ADM and an interface of the associated ADM, one transmission wavelength being allocated to each interface.