A FULL-DUPLEX RADIO-OVER-FIBER ARCHITECTURE USING DIFFERENTIALL PHASE-SHIFT KEYING SIGNALS FOR DOWNSTREAM AND REMODULATED OOK FOR UPSTREAM

Abstract

Radio-over-Fiber (ROF) is a promising technology to achieve future broadband access requirements with reliability, transparency and flexibility. We propose a novel full-duplex bi-directional radio-over-fiber (ROF) system transmitting 10 Gb/s differential phase-shift keying (DPSK) signals at the central office (CO) for downstream and ON–OFF keying (OOK) re-modulation of the downlink carrier at the base station (BS) for upstream. As the same optical carrier is used for both uplink and downlink, no additional light source is required at the BS, which significantly reduces the cost, improves the wavelength utilization efficiency and simplifies the overall system. The simulation results show that the downstream 10 Gb/s DPSK data and the upstream 1Gb/s OOK data can transmit over 50km single-mode fiber successfully without dispersion compensation. The results show that this scheme provides a practical solution to meet the data rate and cost requirement of tomorrow’s ROF access networks.