OPM产生四倍频光载毫米波的双向ROF系统

提出一种采用单个光相位调制器(OPM)和光纤布拉格光栅(FBG)滤波器产生四倍频光载毫米波的双向光纤无线通信(ROF)系统。在中心站(CS),系统采用基带信号与射频(RF)信号混频后去驱动OPM,以产生抑制一阶边带的多边带光信号。在基站(BS),利用FBG滤波器将信号的重复频率增至4倍。实验结果显示,经过40km光纤传输后,下行链路信号的眼图清晰可见,功率代价小于1.6dB。本文方案中,由于没有额外增加激光源使得基站结构进一步简化,同时四倍频技术降低了RF信号的频率,系统成本大大降低。

A full-duplex radio-over-fiber system through OPM generating quadrupling-fre quency optical millimeter-wave

A full-duplex radio-over-fiber (ROF) system through an optical phas e modulation(OPM) and a fiber Bragg grating (FBG) filter generating quadrupling-frequency optical millimeter-wave is proposed and analyzed theoretically.At central station,the system applies the mixed-frequency signals with base-band signals and radio frequency(RF) signals to drive an OPM,and then multiple-sideband optical signal with suppressed fir st-order sideband is generated.After transmission over fiber,the FBG filter is used to obtain the optical sig nal with quadrupling frequency at base station. The simulation results show that the downstream signal is visible on eye diagram s after 40km fiber transmission with less than 1.6dB power penalty.In this new scheme,the configuration of the base stat ion is further simplified because there is no additional laser,at the same time the frequency of RF signal is reduced due to frequency quadrupling.The cost of the new system is largely reduced.