A scheme of full-duplex radio over fiber link model

A new full-duplex radio over fiber link model was proposed in this paper. For the down link, two mach-zehnders modulator cascaded were employed to generate sextupling-frequency millimeter wave; the single side-band modulation was used to overcome the walk-off effect, thereby the transmission distance was effectively improved. In the meanwhile, the first order sideband was employed as the carrier of uplink baseband signal and thus the requirement of additional laser source was eliminated. Furthermore, self-homodyning demodulation method was adopted to avoid the need of local oscillator, thereby the cost of system was reduced. Numerical result shows that the proposed full-deplex model can produce 60 GHz millimeter wave by only using 10 GHz modulated signal. The transmission distance for down link can reach 250 km and that for the up link is more than 300 km.