Dai Jian, Liu Anni, Liu Jingliang, Zhang Tian, Zhou Yue, Yin Feifei, Dai Yitang, Liu Yuanan, Xu Kun
Opt Express. 2017 Oct 30;25(22):27060-27066. doi: 10.1364/OE.25.027060.
The coupled optoelectronic oscillator (COEO) is typically used to generate high frequency spectrally pure microwave signal with serious sidemodes noise. We propose and experimentally demonstrate a simple scheme for supermode suppression with mutual injection locking between the COEO (master oscillator with multi-modes oscillation) and the embedded free-running oscillator (slave oscillator with single-mode oscillation). The master and slave oscillators share the same electrical feedback path, which means that the mutually injection-locked COEO brings no additional hardware complexity. Owing to the mode matching and mutually injection locking effect, 9.999 GHz signal has been successfully obtained by the mutually injection-locked COEO with the phase noise about -117 dBc/Hz at 10 kHz offset frequency. Besides, the supermode noise can be significantly suppressed more than 50 dB to below -120 dBc.
耦合光电振荡器（COEO）通常用于产生具有严重边模噪声的高频频谱纯净微波信号。我们提出并通过实验证明了一种简单方案，用于通过COEO（具有多模振荡的主振荡器）与嵌入式自由运行振荡器（具有单模振荡的从振荡器）之间的相互注入锁定来抑制超模。主振荡器和从振荡器共享相同的电反馈路径，这意味着相互注入锁定的COEO不会带来额外的硬件复杂性。由于模式匹配和相互注入锁定效应，相互注入锁定的COEO已成功获得9.999 GHz信号，在10 kHz偏移频率下的相位噪声约为-117 dBc/Hz。此外，超模噪声可被显著抑制超过50 dB至-120 dBc以下。
