WDM ROF OFDM/QAM System for Wireless PON

Radio over fiber (RoF) OFDM with QAM modulation are key technologies enabling the new radio (NR) 5G and 6G backbone optical systems. A wavelength division multiplexing ROF OFDM architecture is investigated to enable higher capacity passive optical network for NR systems. Two DWDM wavelengths at 1931.1 and 193.2 THz are modulated with the downstream data. While another two dense wavelength division multiplexing (DWDM) continuous wave (CW) lasers at 193.16 and 193.26 THz are transmitted with the downstream data and modulated with the upstream data after amplified using a reflective semiconductor amplifier (RSOA). The upstream lasers are set at 60GHz off the downstream lasers typically used for mm waves. Different configurations of OFDM QAM and 16QAM systems are investigated in this work for different bit data rates and reaches. The study revealed that a10Gbps may be conveyed utilizing 4QAM and 16QAM modulation across 150 kilometers of fiber.