With the development of multimedia services, demands of higher channel capacity, wider service coverage and broadband wireless access advance radio over fiber (ROF) technology rapidly. Meantime, some new technologies, such as coherent technology, multiband technology, multiple input multiple output (MIMO), orthogonal frequency division multiplexing (OFDM) and so on, are introduced and being optimized in ROF system. Employing such new technologies in ROF system, promises to solve the present technological bottlenecks in radio over passive optical network (RPON) and optimize the performance of the whole system. In this paper, the principles of those technologies, how they could be used in ROF system and their advantages as well as shortcomings are discussed and analyzed to provide a reference for future researchs.