提出了一种基于受激布里渊散射效应的瞬时频率测量方法.未知信号经过强度调制作为泵浦光, 矢量网络分析仪产生的信号经过相位调制作为扫描信号光, 当泵浦光和扫描信号光之间满足相位匹配条件时, 受激布里渊散射效应发生并实现相位调制到强度调制的转换, 未知信号的频率被测量.实验验证可以测量0.5 GHz-27 GHz的微波信号的频率, 最大误差小于20 MHz.

A photonic method for instantaneous microwave frequency measurement based on stimulated Brillouin scattering was proposed. The unknown radio frequency signal is modulated by intensity modulator and then it is considered as pump light. The signals generated by vector network analyzer are modulated by phase modulator and then they are considered as sweeping signal light. When the phase matching condition is satisfied between pump light and sweeping signal light, the stimulated Brillouin scattering occurs and the conversion from phase modulation to intensity modulation selectively is achieved. The frequency of unknown radio frequency signal is ultimately measured. Experimental results demonstrate that the measurement ranges from 0.5 GHz to 27 GHz and the maximum measurement error is less than 20 MHz.