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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。
In order to further effectively improve the performance of the optoelectronic oscillator, a high side mode rejection ratio oscillator based on the optoelectronic double loop is proposed. The two-stage electrical power splitter is used to form the electrical gain ring cavity. Combined with the optical fiber double-loop structure formed by the polarization beam splitter and the polarization beam combiner, the high side mode rejection ratio is obtained without the introduction of external modulator and electric filter. Miniaturized optical oscillator. In the experiment, the length of the optical fiber is 110m and 2km. The microwave signal with the center frequency of 11.4GHz is obtained. The side mode suppression ratio is 60dB and the phase noise is -103.6dBc / Hz@10kHz.