Fiber-Wireless System Using All-Photonic Transceiver for Tunable sub-THz Signal Generation and Down-conversion

A flexible fiber-wireless system using all-photonic transceivers for generation, transmission, reception, and down-conversion of spectrally agile radio signals up to 220 GHz is proposed and demonstrated. The system employs a low-loss optical modulator for direct radio-to-optical conversion and photonic down-conversion method. A high-extinction-ratio optical modulator was fabricated and employed for pure two-tone optical signal generation for tunable radio signal up- and down-conversion. Using the proposed system, we successfully transmitted 5G new radio standard-compliant and 100-Gb/s OFDM signals and achieved satisfactory performance.