Radio-over-fiber system has a broad prospect in broadband wireless communication networks. Due to the coexistence of multiple standards of broadband wireless communication networks, the frequency of local oscillation signal used in base station is different from each other. A novel scheme is presented to generate and deliver multi-channel local oscillation signals simultaneously and remotely by making use of an optical phase modulator and an optical periodic band-pass filter in central station. The single local oscillation system in central station can be shared by a number of base stations which belong to several standards. The frequency and the line width of local oscillation signal is analyzed theoretically. The simulation to generate and deliver multi-channel local oscillation signals such as 19.2 GHz, 25.6 GHz and 38.4 GHz simultaneously with an single electrical drive signal operating at frequency of 6.4 GHz is performed. The theoretical analysis and simulation results both show that local oscillation signals have very high purity, and the purity is not affected by the line width of the source. Then a bi-directional scheme is proposed. In such scheme, the compatibility of multiple standards can be solved very well. The chromatic dispersion and the cost can be reduced extremely. In addition, the capacity of system could be enlarged.