A radio-over-fiber (RoF) system combines the advantages of fiber and wireless communication,has the characteristics of large bandwidth, low loss, and flexible mobility,and has broad development prospects in the future beyond 5G/6G communication networks. In this paper, we have realized the effective transmission of polarization-division-multiplexing quadrature-phase-shift-keying (PDM-QPSK) signals with a transmission rate more than 100 Gbit/s in the RoF system based on commercial optical transport network (OTN) real-time processing. Specifically, we respectively demonstrate the transmission of PDM-QPSK signals with a frequency of 22 GHz and a transmission rate of 125.52 Gbit/s in 20 km+25 km two-span fiber and PDM-QPSK signals in 20 km+25 km two-span fiber and 1 cm wireless links with a frequency of 60 GHz and a transmission rate of 125.52 Gbit/s. The results show that if soft-decision forward-error-correction (SD-FEC) coding with a 15% overhead is enabled, error-free transmission can be realized. In addition, we propose a new method for polarization modulation by an integrated dual-polarization Mach-Zehnder modulator (DP-MZM) in the real-time processing. The RoF system reduces system complexity, which has great application value in future mobile data communication networks.