as one of the most important applications of microwave photonic, rof (radio over fiber) system, which combines the advantages of optical communication and wireless communication, is a good candidate for broadband mobile communication in this paper, we built and simulation a 60ghz rof(radio-over-fiber) transmission system based on pm modulator. first, we introduce the pm-im(phase modulation to intensity modulation) modulation mechanisms by the breaking the phase balanced approach. this method solves the problem that the constant envelope (phase modulation signal) generated by the phase modulator can not be directly detected by a photo detector. a standard single-mode fiber (smf) is connected input to the f-p(fabry-perot) optical filter, which is to achieve the pm-im modulation conversion by changing the wavelength of the laser or the frequency of the modulation factor of the f-p optical filter to adapt to different fiber lengths and the signal transmission rate. these two methods which changing the phase relationship between the optical carrier and the optical side band can realize the ideal phase transition to obtain efficient and low loss modulation conversion. finally, the simulation results show that different fiber lengths and the signal transmission rate configuration of different wavelength of the laser or the frequency of the modulation factor of the f-p optical filter, the ber performance and the eye diagram of the 60ghz rof transmission system signals have been improved based on these pm-im modulation methods. © 2016 spie.