基于反馈控制环路提高光电振荡器长期稳定性的方法

Long-term Stability Improvement in an Optoelectronic Oscillator Based on a Feedback Control Loop

提出了一种基于反馈控制环路提高光电振荡器长期稳定性的方法.该方法用现场可编程门阵列和分频电路测量光电振荡器的信号频率,用光纤延迟线调节光电振荡器环路长度.对测量光电振荡器频率的分频方法的精确度进行了理论分析.基于单环结构的实验证明这种方法在有效提高光电振荡器的长期稳定性的同时不会降低系统的相位噪声性能,带有反馈控制环路的光电振荡器7小时的频率稳定性可以达到0.8ppm.

A method for the long-term stability improvement of an optoelectronic oscillator was proposed,which is based on a feedback control loop.To achieve the long-term stability,the frequency of optoelectronic oscillator is measured with a field programmable gate array and a frequency dividing circuit.Then the length of optoelectronic oscillator loop is adjusted with a fiber delay line.The accuracy of dividing method to measure the frequency of optoelectronic oscillator is discussed in theory.An experiment based on a single loop structure shows that the phase noise performance does not deteriorate while the long-term stability of optoelectronic oscillator is effectively improved,and the frequency stability of optoelectronic oscillator with feedback control loop is±0.8ppm over 7hours.