A photonic radiofrequency signal cross-connect and frequency conversion device comprising: • a plurality of inputs (PE1 - PE12) for respective radiofrequency signals (RFin; RFin1 - RFin12); • a plurality of electronic/optical converters (CEO1 - CEO12), each said converter being associated with one said input and being configured to generate an optical signal by transferring one said radiofrequency signal to an optical carrier at a respective wavelength (λ 1 - λ 12); • at least one first set of optical combiners (MUXO1 - MUXO3), each optical combiner of said first set being configured to group together a plurality of said optical signals in a same optical path (CTO1 - CTO3); • a plurality of electro-optical modulators (MEO1 - MEO3) associated with respective optical paths, each said electro-optical modulator being configured to mix all of the optical signals being propagated in the corresponding optical path with a respective radiofrequency carrier; • a plurality of optical splitters (DMXO1 - DMXO3) configured to split the optical signals, mixed by said electro-optical modulators with their respective radiofrequency carrier, being propagated in each of said optical paths; • a second set of optical combiners (CBO1 - CBO4; MUXOS1 - MUXOS4), each optical combiner of said second set being configured to group together a plurality of optical signals deriving from different optical paths; and • a plurality of optical/electronic converters (COE1 - COE4), each said converter being associated with an optical combiner of said second set and being configured to convert the composite optical signal deriving from the respective optical combiner into an output radiofrequency signal (RFout; RFout1 - RFout4); said electronic-optical converters and optical combiners of said second set being configured in such a way that all the optical signals being propagated along a same optical path, and all the optical signals grouped together by a same optical combiner of the second set, have optical carriers of different wavelength. • a plurality of inputs (PE1 - PE12) for respective radiofrequency signals (RFin; RFin1 - RFin12); • a plurality of electronic/optical converters (CEO1 - CEO12), each said converter being associated with one said input and being configured to generate an optical signal by transferring one said radiofrequency signal to an optical carrier at a respective wavelength (λ 1 - λ 12); • at least one first set of optical combiners (MUXO1 - MUXO3), each optical combiner of said first set being configured to group together a plurality of said optical signals in a same optical path (CTO1 - CTO3); • a plurality of electro-optical modulators (MEO1 - MEO3) associated with respective optical paths, each said electro-optical modulator being configured to mix all of the optical signals being propagated in the corresponding optical path with a respective radiofrequency carrier; • a plurality of optical splitters (DMXO1 - DMXO3) configured to split the optical signals, mixed by said electro-optical modulators with their respective radiofrequency carrier, being propagated in each of said optical paths; • a second set of optical combiners (CBO1 - CBO4; MUXOS1 - MUXOS4), each optical combiner of said second set being configured to group together a plurality of optical signals deriving from different optical paths; and • a plurality of optical/electronic converters (COE1 - COE4), each said converter being associated with an optical combiner of said second set and being configured to convert the composite optical signal deriving from the respective optical combiner into an output radiofrequency signal (RFout; RFout1 - RFout4);