光载无线技术(RoF)因其大带宽、高移动性和低传输损耗等特点,成为未来接入网极具前景的解决方案之一。同时,该技术与矢量调制格式结合可以有效提高系统容量。但是如何低成本地产生光矢量微波/毫米波一直是亟待解决的问题。从预编码和光子倍频技术出发,提出多种光子辅助微波/毫米波产生方案,这些方案从成本、器件可用性、系统复杂度、系统容量等角度对传统方案进行了改进,为将来的研究工作提供参考。

Radio-over-fiber(RoF) technology is a promising candidate in future access network due to its advantages of large bandwidth, high mobility, and low propagation loss. Meanwhile, the introduction of vector signal modulation into the radio-over-fiber (RoF) system can effectively improve the system capacity. However, how to generate low-cost photonic vector microwave/millimeter-wave signal has been a tricky problem to solve. Recently, researchers have proposed various kinds of photonic vector microwave/millimeter-wave signal generation schemes based on photonic frequency multiplication and pre-coding. These schemes improve the system in terms of cost, availability of optical and electrical components, system complexity and system capacity, which paves the way for future work.