An optical switching device is provided. The device includes an input stage (1) comprising broadcast modules (MD1-MD3) that provide duplicates of the same multiplex, an output stage (2) comprising programmable multiplexer modules (OWS1-OWS3) having inputs associated with respective broadcast modules, and an intermediate stage (3) connecting each programmable multiplexer module input that is associated with a broadcast module to an output of the associated broadcast module. Each broadcast module includes a programmable demultiplexer module (IWS1-IWS3) having a transit output (B1), and a selection output (B2) and a star coupler (SC1-SC3). The transit output (B1) is connected to a first input (C1) of the coupler and an input and an output of a processing device (RG, RG′) are respectively connected to a selection output (B2) and to a second input (C2) of the coupler.