基于相位调制器产生光毫米波的全双工光纤无线通信系统

Full-Duplex Radio-over-Fiber System with Optical Millimeter-Wave Generation Utilizing Optical Phase Modulator

提出并实验研究了一种基于相位调制器产生光毫米波信号的全双工光纤无线通信(RoF)系统。在中心站采用相位调制器结合滤波的方法产生重复频率为40GHz的载波抑制双边带毫米波信号,利用交叉复用器分离开毫米波信号的上下边带,其中的一个边带强度调制数据速率为2.5Gbit/s的下行基带信号,另一个边带被发送到基站调制上行传输的基带数据。该系统抗色散效果好,在经过40km标准单模光纤上/下行传输数据速率2.5Gbit/s的基带信号后,双向的传输功率代价都小于0.5dBm。在光纤无线通信系统中采用相位调制器结合滤波的方法产生光毫米波,同时基于波长重用技术再生上行光载波信号,可以简化中心站和基站配置,节约系统成本。

A full-duplex radio-over-fiber （RoF） system with optical millimeter-wave generation utilizing optical phase modulator was designed and experimentally demonstrated. Carrier suppression double sideband optical signal with 40 GHz repetitive frequency is generated by using an optical phase modulator along with optical filtering technique. An optical interleaver was employed to separate the two first-order sideband earriers, one of the carriers was used to carry 2.5 Gbit/s downstream data, while the other was sent to base station for reuse for modulating upstream data. It was experimentally demonstrated that the 2.5 Gbit/s data for bidirectional transmission were transmitted over 40 km standard single mode fiber （SMF-28） with less than 0.5 dBm power penalty. By using optical phase modulator along with optical interleaver to generate optical mm-wave, and adopting the wavelength reuse technique, the proposed RoF system becomes simple and cost-effective.