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提出了一种全新的基于双均匀光纤光栅(UFBG)结构的毫米波产生方法,主要利用光纤光栅的滤波特性在中心站取得两束频率间隔为所需毫米波的光波,经差频后得到毫米波,并将其作为副载波。分析了经过0km,10km,30km,40km光纤传输后在基站接收端经过光电检测和相干解调滤波后得到的眼图。研究结果表明,该方法应用于光载无线通信(ROF)下行通信链路可获得比较理想的传输效果,且相同情况下,减小毫米波发生器中带通滤波器的带宽可以进一步改善系统的传输效果。
A new generation method of millimeter wave based on double uniform fiber grating (UFBG) is proposed, which mainly uses the filtering characteristic of fiber grating to obtain two light waves with the required millimeter wave frequency at the central station. After the difference frequency, the millimeter Wave and use it as a subcarrier. The eye diagrams obtained after the optical fiber detection at the receiving end of the base station and the coherent demodulation filter after the 0km, 10km, 30km, 40km optical fiber transmission are analyzed. The results show that the proposed method can be applied to the downlink communication link of optical carrier wireless communication (ROF), and the transmission effect is better. In the same situation, reducing the bandwidth of the band-pass filter in the millimeter-wave generator can further improve the performance of the system Transmission effect.