介绍了一种基于微波光子链路的高精度变频技术,此技术基于微波光子学信号调制及处理,对射 频信号进行电光转换变成光信号,通过光学滤波及声光移频对其做上下移频处理,最终获得高精度 变频信号。该系统在20 GHz范围内均能对射频信号进行±2 MHz内的移频,最高精度可达100 Hz。得益 于微波光子链路大带宽、实时和高精细的特点,此技术可以在光域对高频率的射频信号进行高精度 实时变频,从而克服频率限制,实现射频信号的精细频率调控。

A high precision frequency conversion technology based on microwave photonic link is introduced, which is based on modulation and processing of microwave photonics signal. Radio frequency signal is converted into optical signal by electro-optic conversion, and the frequency is converted up and down through optical filter and acousto-optic frequency shift. Finally high-precision frequency conversion signal is obtained. The system can shift the frequency of RF signal within ±2 MHz in the range of 20 GHz, and the maximum accuracy can reach 100 Hz. Benefiting from the high bandwidth, real-time and high precision of microwave photonic link, the technique can perform high precision real-time frequency conversion of high frequency radio frequency signal in optical domain to overcome frequency limitation and achieve fine frequency regulation of radio frequency signal.