利用基于受激布里渊散射的载波抑制实现ROF链路性能的改善

he theory of carrier subtraction method for performances improvement of radio-over-fiber (RoF) link with fixed incident optical power on photodetector (PD) is precisely and completely demonstrated. An analytical model is proposed to quantify the improvement of link gain, noise figure (NF) and spur-free dynamic range (SFDR) with the change of carrier suppression ratio. The modulation index m for the validity of this carrier subtraction method is fully investigated. The optimum optical carrier-to-sideband ratio (CSR) for RoF link performances in both double-sideband and single-sideband modulation is obtained. The simulation results and experimental results are then presented, which have good agreement with each other. The experiment is realized through stimulated Brillouin scattering (SBS), which has many advantages as a carrier filter, such as self-tuning, self-regulating and narrow gain spectrum.