Fig. 1. Block diagram of BICM-PS program

Fig. 2. Mapping rule diagram of 16QAM probabilistic shaping coding scheme

Fig. 3. PS-based RoF system

Fig. 4. Probability distribution of PS-16QAM

Fig. 5. 80 GHz OFDM optical and electrical spectrogram. (a) Spectrogram; (b) electrical spectrogram

Fig. 6. Constellation diagrams of 16QAM/OFDM signal transmitted through optical fibers with different lengths. (a) 0 km; (b) 10 km; (c) 20 km

Fig. 7. Constellation diagrams of PS-16QAM/OFDM signal transmitted through optical fibers with different lengths. (a) 0 km; (b) 10 km; (c) 20 km

Fig. 8. Comparison of bit error rate and transmitting optical power between probability shaping and traditional 16QAM/OFDM

Fig. 9. Constellation diagrams of PS-16QAM/OFDM signal transmitted through optical fibers with different lengths. (a) 0 km; (b) 10 km; (c) 20 km