A new type of optical information coding and modulation combination scheme is proposed, and the high speed long distance radio over fiber (RoF) communication is realized by using double photoelectric arms coherent modulation and new optical information coding technology. In the first modulation, the effective bandwidth of signal code is the half of the effective bandwidth of non return to zero code of ordinary optical. In the second modulation, the ultra- high frequency millimeter wave is modulated to the light wave in order to realize radio over fiber transmission. By advanced optical system development software(OptiSystem) simulation, the simulation results show that when eye diagram is nomal and the bit error rate of transmission system can be controlled, the transmission distance of code in radio over fiber communication system is 1.6×106 m, and the speed is 40 Gb/s.