The present invention relates to a generator (G1) of at least M optical signals carrying selectable carrier data and wavelengths, M being an integer greater than 1, comprising N laser sources (S i) of lengths constant and distinct from each other, N being an integer greater than 1, and an optoelectronic modulator (Mod1) capable of forming one of said M optical data carrying signals. The generator further comprises: - M-1 other optoelectronic modulators (Mod2 to ModM)) each capable of forming one of said M-1 other optical data-carrying signals, - a diffusing optical switch (100) having N input ports (PE i) connected to the N laser sources and M output ports (PS i) connected to the M modulators, the optical switch being able to send to each of the M modulators a selectable carrier wavelength output signal for the formation of said M signals. / P
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