为了进一步有效提高光电振荡器的性能,提出了一种基于光电混合双环的高边模抑制比振荡器.利用两级电功分器构成电增益环腔,结合偏振分束器和偏振合束器形成的光纤双环结构,在没有引入外调制器和电滤波器的前提下,得到了高边模抑制比的小型化光电振荡器.实验中光纤长度取110m和2km,获得了中心频率为11.4GHz的微波信号,边模抑制比为60dB,其相位噪声为-103.6dBc/Hz@10kHz.

For the new designed high sidemode suppression ratio oscillator,by applying the two-stage electric power dividers to form the electronic gain ring cavity,a micro optoelectronic oscillator with high sidemode suppression ratio was obtained based on combining the optical dual-ring structure constituted with polarization beam splitter and polarization beam combiner without introducing external modulator and electric filter.In the experiment,the length of the fiber is choosen to be 2km and 110m,the microwave signal is obtained with the center radio frequency of 11.4GHz,sidemode suppression ratio of 60dB and phase noise of -103.6dBc/Hz@10kHz .