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Radio-over-Fiber (RoF) is a promising technology to fulfill future broadband access requirements with reliability, transparency and flexibility. We propose bi-directional RoF system with high RF carrier support. Downlink scheme utilizes optical frequency up-conversion while uplink scheme is based on electrical frequency down-conversion. For downlink, an un-modulated micro-wave band signal, f _LO electrically combined with DPSK encoded digital data stream sub-carrier modulated at intermediate frequency (IF) is intensity modulated at an optical carrier, λ _IF in Control Station. An un-modulated high frequency carrier, Local Oscillator (LO) is also modulated over separate wavelength, λ _LO at CS. At remote node (RN), semiconductor optical amplifier Mach-Zehnder interferometer (SOA-MZI) is used for photonic mm-wave mixing (between λ _IF and λ _LO ) and frequency up-conversion. After photo-detection at BS of …