基于双环路光子微波超低相位噪声源的仿真分析

Simulation Analysis of Ultra-Low Phase Noise Source Based on Dual-Loop Photonic Microwave

摘要: 论文利用双环路光电振荡器结构来解决单环结构光电振荡器单模输出与高Q值的矛盾，双环OEO系统由MZM调制器、射频滤波器、偏振分束器、偏振合路器、两段不同长度的单模光纤、光电探测器和射频放大器等器件组成。PBS加PBC的分光合路方案能保证双环中光场的偏振正交性，大大降低了干涉拍频引入的相位噪声。文章中采用两种不同光纤长度仿真实验获得X波段内频率可调谐的高质量微波信号，得到了很好的相位噪声效果。

Abstract: The paper uses the dual-loop opto-oscillator structure to solve the contradiction between the sin-gle-mode output of the single-ring structural optoelectronic oscillator and the high-Q. The system consists of a dual-ring OEO system consisting of an MZM modulator, a radio frequency filter, a po-larization beam splitter, a polarization combiner, two different-length single-mode fibers, a pho-todetector, and a radio frequency amplifier. The splitting and combining scheme of PBS and PBC can ensure the polarization orthogonality of the light field in the double ring and greatly reduce the phase noise introduced by the interference beat frequency. In the article, two different fiber length simulation experiments were used to obtain high-quality microwave signals with tunable frequencies in the X-band, and a good phase noise was achieved.