A frequency interleaving-based DWDM-ROF system is designed
in which the idle frequency bands between the carrier and sidebands of each channel is utilized
thus improving the system spectral efficiency.At the same time
a novel demultiplexer based on Fiber Bragg Grating(FBG) is designed for this system.The simulation results in data transmissions not only verify the feasibility of the proposed method
but also show that the system is well resistant to interchannel crosstalk.