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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 optical fiber wireless communication (RoF) system based on phase modulator to generate optical millimeter wave signal is proposed and experimentally studied. At the central station, a phase modulator and a filtering method are used to generate a carrier-suppressed double-sideband millimeter-wave signal with a repetition frequency of 40 GHz. The upper and lower sidebands of the millimeter-wave signal are separated by a cross-multiplexer. One of the sideband intensity modulation data rates is 2.5Gbit / s downlink baseband signal, the other sideband is sent to the base station to modulate the uplink transmission baseband data. The anti-dispersion effect of the system is good, after 40km standard single-mode fiber uplink / downlink data rate of 2.5Gbit / s baseband signal, the bidirectional transmission power cost is less than 0.5dBm. In the optical fiber wireless communication system, a phase modulator and a filtering method are used to generate optical millimeter waves. Meanwhile, the uplink optical carrier signals are regenerated based on the wavelength reuse technology, which simplifies the configuration of the central station and the base station and saves the system cost.