“…The possibility to exploit many optical carriers propagating at the same frequency with no interference, has aroused particular attention in the telecom field [11], which is constantly pursued by the worldwide restless demand for increasing bandwidth [12]. Besides wavelength, polarization, time, and amplitude/phase, the modulation and multiplexing of OAM promise to provide a significant increase in the information capacity of today's optical networks [13], both for free-space [14] and optical fibers communication [15,16]. However, the implementation of OAM-mode division multiplexing (OAM-MDM) in a real scenario is still restrained by the lack of the commercial devices to perform optically the typical operations required in an optical link.…”