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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 bi-directional optical fiber wireless communication (ROF) system using a single optical phase modulator (OPM) and a fiber Bragg grating (FBG) filter to generate quadruple-frequency optical millimeter waves is proposed. At the central station (CS), the system mixes the baseband signal with a radio frequency (RF) signal to drive the OPM to produce a multi-band optical signal that suppresses the first-order sideband. At the base station (BS), the repetition frequency of the signal is increased by 4 times using the FBG filter. The experimental results show that the eye of the downlink signal is clearly visible after 40km optical fiber transmission, and the power cost is less than 1.6dB. In this scheme, the base station structure is further simplified because no additional laser sources are added, and the quadruple frequency technique reduces the frequency of the RF signal and the system cost is greatly reduced.