A full-duplex 100-GHz radio-over-fiber communication system based on frequency quadrupling

We have experimentally demonstrated an effectively full-duplex radio-over-fiber (ROF) system, which only used a single light source at central station (CS). Frequency quadrupling modulation scheme was employed to generating 100-GHz optical millimeter wave (mm-wave) for downlink transmission while the central optical carrier was reused at base station (BS) for uplink connection. Using this proposed system design, 2.5-Gb/s OOK data was successfully transmitted over 10-km dispersion shifted fiber (DSF) and 3-m wireless link for downstream channel with about 3.5-dB power penalty, and 2.5-Gb/s OOK data was transmitted over 50-km standard single-mode fiber (SMF) for upstream channel with power penalty less than 0.5-dB.This system shows good performance in long distance transmission and provides an efficient solution for high frequency mm-wave communication.