实验研究了一种基于单臂马赫-曾德尔强度调制器,并在基站利用光载波抑制技术产生40 GHz光载毫米波的全双工正交频分复用光纤无线通信(OFDM-ROF)系统。在下行链路中,2.5 Gb/s的OFDM信号与20 GHz的射频正弦波信号混频后,驱动强度调制器调制中心激光载波,经标准单模光纤(SSMF)传输至基站后接收;在上行链路中,通过波长重利用调制2.5 Gb/s的开关键控信号传输至中心站。实验结果表明,下行和上行分别经过50 km SSMF传输后功率代价分别小于1和0.5 dB。

A full-duplex orthogonal frequency division multiplexing-radio over fiber (OFDM-ROF) system with 40 GHz optical millimeter-wave generation by utilizing single-arm Mach-Zehnder intensity modulator and optical carrier suppression modulation in base station is proposed and experimentally investigated. In the downstream,2.5-Gb/s OFDM analog data and 20-GHz radio frequency clock are mixed and used to modulate optical carrier by driving optical intensity modulator. The signal at base station after transmission over standard single mode fiber is demodulated,received and analyzed. In the upstream,the same optical carrier is reused at base station for uplink connection of 2.5-Gb/s on-off keying data. Experimental results show that the downlink and uplink data is successfully transmitted over a 50-km single-mode fiber (SMF-28) with less than 1 and 0.5 dB power penalty,respectively.