长光纤环高性能光电振荡器研究

Research on Long Fiber Loop Optoelectronic Oscillator of High Performance

提出了采用多个长光纤环实现高性能光电振荡器的方法,通过合理的长度设计,多个长光纤环能够降低光电振荡器的相位噪声,同时提高边模抑制比。理论分析了多个长光纤环实现高性能光电振荡器的可行性,并构建了实验系统。在实验中,利用3个大于4km的长光纤环构建光电振荡器,实现了频率10GHz的微波信号,其相位噪声在频偏10kHz处达到了-130dBc/Hz,边模抑制比达到了60dBc。实验结果与理论分析一致,证明了该方法的正确性。

A novel optoelectronic oscillator with multiple long fiber loops is proposed. This oscillator can simultaneously have lower phase noise and higher side mode suppression ratio than current multiloop optoelectronic oscillators. A three-fiber-loop oscillator with more than 4 km fiber length is investigated in theory and experiment. The optoelectronic oscillator with frequency of 10 GHz, phase noise of --130 dBc/Hz at 10 kHz offset, and side mode suppression ratio of 60 dBc is demonstrated. The agreement of experimental results and theoretcal analysis justifies this method.