OFDM MODULATED FULL-DUPLEX WDM-ROF SYSTEM

A full-duplex Wavelength Division Multiplexed Radio Over Fiber (WDM-RoF) system is proposed with Orthogonal Frequency Division Multiplexing (OFDM). Electroab- sorbtion modulator, Phase modulator and intensity modulator are cascaded in order to generate a tunable optical frequency comb (OFC). Here, 21 comb lines are generated such that each base station uses three comb-lines. The difficulty in incorporating OFDM into a full-duplex system is overcome by proper design. OFDM signal generated is used to modulate the comb-line in both uplink and downlink transmission. The constellation diagram is plotted for 20 km and 60 km optical fiber. Hence the data can be transmitted over a considerable distance with increased capacity and data rate.