A device (D) dedicated to optical switching in a switching node (NC) comprises at least one first switching matrix (MC1) and one second switching matrix (MC2) coupled to each other and each comprising i) a first stage including N.sub.i diffusion modules each having a first input and M.sub.i first outputs and ii) a second stage including N.sub.i fusion modules each having N.sub.i second inputs each coupled to one of the M.sub.i first outputs of one of the N.sub.i diffusion modules via an optical line, at least one third input and one second output. The second stage of at least one of the matrices comprises at least one additional fusion module having N.sub.i second inputs adapted to apply optical power adjustment and one second output. At least one optical line (LS1) couples the second output of an additional fusion module of one of the matrices (MC1) to a third input of each of the N.sub.i fusion modules of the other matrix (MC2).