基于单MZM和FBG的10倍频抑制载波RoF系统

Frequency 10-tupling suppression carrier RoF system based on single MZM and FBG

为优化光载无线通信系统(RoF)结构,提出了一种基于单马赫曾德尔外调制器(MZM)和光纤布拉格光栅(FBG)的10倍频抑制载波RoF系统实现方案。通过设置射频驱动信号幅度和MZM偏置电压抑制主载波和偶数阶边带,结合FBG滤波功能,最终实现10倍频RoF毫米波信号。理论推导了10倍频毫米波信号实现机理,优化了FBG带宽及反射率,实验结果表明该新型RoF系统传输20 km后功率代价为1.66 dB。

To optimize the structure of optical wireless communication system(RoF),a frequency 10-tupling suppression carrier RoF system based on single Mach Zehnder external modulator(MZM)and fiber Bragg grating(FBG)was proposed.By setting the amplitude of RF driving signal and the bias voltage of MZM to suppress the main carrier and even-order sidebands,combined with FBG filtering function,the frequency 10-tupling RoF millimeter-wave signal was finally realized.The realization mechanism of frequency 10-tupling millimeter-wave signal was theoretically deduced,and the bandwidth and reflectivity of FBG were optimized.The results show that the power penalty of the proposed system is 1.66 dB after 20 km transmission.