设计了一种基于法布里-珀罗(FP)标准具的双环路光电振荡器(OEO),该振荡器能将连续的光功率转换为稳定的频谱纯净的微波信号。FP标准具具有滤波的特性,因此可以替代普通OEO中的电滤波器从而降低电噪声,此外,FP标准具是一种高Q值的光学器件,可以缩短普通OEO所使用的光纤长度。双环路结构的引入能够更好地保证振荡器的单模输出,进一步降低相位噪声。仿真结果证明这种新型结构的OEO可以实现20GHz范围内振荡频率为15GHz的单模起振,边模抑制比超过150dB,使用的两条光纤环路长度分别为5m和36m。 A dual-loop opto-electronic oscillator (OEO) based on the Fabry-Perot (FP) etalon is designed to convert continuous optical power into a stable spectrally pure microwave signal. The FP etalon has filtering characteristics so it can replace electrical filters in common OEOs to reduce electrical noise. In addition, the FP etalon is a high-Q optics device that reduces the length of the fiber used for normal OEO. The introduction of the double loop structure can better ensure the single mode output of the oscillator and further reduce the phase noise. Simulation results show that the OEO with this new structure can achieve single mode oscillation with the oscillation frequency of 15GHz in 20GHz and the side mode suppression ratio exceeds 150dB. The length of the two fiber loops used is 5m and 36m respectively.