Patent ID: 7653307

Claim:
Optical switching device (D) for a switching node (NC) of a transparent optical network, comprising at least two switching matrices (MCi) coupled to each other, characterized in that each switching matrix (MCi) comprises: a first stage (Ei 1 ) including N i diffusion modules (MDij) each having an input adapted to be coupled to an upstream optical line (FEj) dedicated to the transport of multiplexed channels and M i outputs, where N i is an integer greater than or equal to two and M i is an integer greater than or equal to N i , and a second stage (Ei 2 ) including N i fusion modules (MFij) each having N i inputs each coupled to one of the outputs of one of the N i diffusion modules (MDij) via an optical line (L) and an output adapted to be coupled to a downstream optical line (FSj i ) dedicated to the transport of multiplexed channels, in that the device comprises at least one first additional fusion module (MFA 11 ) having inputs coupled via optical lines to outputs of said diffusion modules (MD 1 j ) of a first of said switching matrices and one output, in that the inputs of said fusion modules and of said first additional fusion module that are coupled to said outputs of the diffusion modules or the outputs of the diffusion modules that are coupled to said inputs are adapted to apply optical power adjustment, in that fusion modules (MF 2 j ) of a second of said switching matrices (MC 2 ) respectively have at least one additional input, and in that it comprises at least one optical line (LS 1 ) coupling the output of said first additional fusion module (MFA 11 ) to said additional inputs of the fusion modules (MF 2 j ) of the second switching matrix (MC 2 ).