A Novel RoF System Integrating Optical Fiber and FSO Channel with Polarization Multiplexing PAM4 Downlink Signals

Abstract

Abstract A novel radio over fiber (RoF) system with polarization multiplexing 4-ary pulse amplitude modulation (PAM4) downlink signals is proposed and designed. The generated downstream signal is transmitted over 25km smf-28 and 100m optical wireless channel. The 60GHz millimeter-wave is generated by the beating of two continuous light waves, and the high frequency signal is demodulated by using self-mixing detection method. We analyzed the transceiver and transmission performance of the introduced polarization multiplexing RoF-FSO system. The results demonstrate this scheme can effectively improve the spectral efficiency of downlink broadband access signals, and be applied in the future broadband access network.