Bidirectional Radio over Fiber Transmission System Using RSOA

Radio over fiber is becoming an increasingly important technology for the wireless market since it introduces a good data transmission rate and large bandwidth. We have demonstrated a bidirectional radio over fiber ROF system based on a reflective semiconductor optical amplifier (RSOA) utilizing an offset quadrature differential phase shift keying (OQPSK) signal for down-link and an on-off keying (OOK) signal re-modulated for up-link. We have performed a detailed comparison between OQPSK and DPSK according to the system behavior. This project provides both Radio-Over-Fiber (RoF) technology and Reflective Semiconductor Optical Amplifier (RSOA) to emerge a cost effective approach for reducing radio system costs because it simplifies the remote antenna sites since RSOA work as an amplifier and modulator, the project also enhances the sharing of expensive radio equipment located at Central Sites (CS).