Real-Time Transmission of 125.52 Gbit/s PDM-QPSK Signal in RadioOver-Fiber System

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- errorcorrection (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.

Automated summary

A radio-over-fiber (RoF) system combines the advantages of fiber and wireless communication, and has the characteristics of large bandwidth, low loss, and flexible mobility. This paper introduces the implementation of high-speed PDM-QPSK signal transmission in the RoF system based on commercial optical transport network (OTN) real-time processing, and proposes a new method for polarization modulation. The research results show that the system has important application value in future mobile data communication networks.