We present the design and results of studying the characteristics of an optoelectronic microwave oscillator in the free-running regime are presented, propose a method for synchronising it with a signal of a highly stable crystal oscillator using a phase-locked loop, and analyse the results of an experimental study on the frequency instability of an optoelectronic microwave reference oscillator. The optoelectronic microwave reference oscillator with optical gain and a 10 GHz oscillation frequency simultaneously provides ultra-low phase noise (less than – 142 dB Hz⁻¹) at a 10 kHz frequency offset from the microwave carrier and a low level of spurs in the oscillation spectrum (no more than – 94 dBc). In this case, the temperature coefficient of the oscillation frequency is determined by the temperature instability of a highly stable crystal oscillator.

我们介绍了在自由运行状态下研究光电微波振荡器特性的设计和结果，提出了一种使用锁相环将其与高度稳定的晶体振荡器的信号同步的方法，并分析了结果光电微波参考振荡器频率不稳定性的实验研究[J]. 具有光学增益和 10 GHz 振荡频率的光电微波参考振荡器同时提供超低相位噪声（小于 – 142 dB Hz ^-1) 与微波载波的频率偏移为 10 kHz，并且振荡频谱中的杂散水平较低（不超过 – 94 dBc）。在这种情况下，振荡频率的温度系数由高度稳定的晶体振荡器的温度不稳定性决定。