Fig. 1. Structure of the developed 28 GHz RoF system

Fig. 2. Optical spectrum of modulated signal by the MZM

Fig. 3. 28 GHz electrical signal spectrum after PD detection

Fig. 4. Eye diagrams of the recovered baseband data at different time. (a) t=0 s; (b) t=15 s; (c) t=30 s; (d) t=60 s

Fig. 5. BS structure based on carrier recovery

Fig. 6. Spectrum of the 2 GHz IF signal

Fig. 7. Waveform of the extracted 2 GHz clock signal

Fig. 8. Stable eye diagram of the baseband data after the second down-conversion