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We investigate and compare the performance of normal and probabilistic shaping (PS)16-ary quadrature amplitude modulation (16QAM) in a photonic vector millimeter-wave(mm-wave) signalgenerationsystem adoptingheterodynecoherentdetection. And we obtain a better bit-error ratio (BER) performance in the PS 16QAM schemecompared to the normal 16QAM scheme in the simulation. We also for the first timeexperimentally demonstrate the feasibility of PS-polarization-division-multiplexing 16QAMin a photonicvector mm-wave signalgenerationsystem employingheterodynecoherentdetection. We obtain the same BER in PS and normal schemes with the PS scheme providing ahigher bit rate. Then we experimentally carry out the performance investigation of PS in a16QAM-modulated radio over fiber system with 40 m wireless transmission

Probabilistic shaping for ROF system with heterodyne coherent detection