基于Add-Drop型氮化硅微环滤波器,利用光学单边带调制和光载波分离的方法,实现可重构微波光子带通滤波器。滤波器带宽和带外抑制比分别达到726 MHz和37.0 dB。并且通过改变光载波波长实现1.64~23.41 GHz的滤波器频率调谐;通过调节微环耦合系数实现0.683~2.246 GHz的滤波器带宽调谐,在带宽调谐范围内带外抑制比大于26 dB。

This study proposes a reconfigurable microwave photonic bandpass filter based on an Add-Drop silicon nitride microring filter via optical single sideband modulation and optical carrier separation. The measured bandwidth and out-of-band rejection ratio of the proposed microwave photonic filter are 726 MHz and 37.0 dB, respectively. Further, a filter with a frequency tuning range of 1.64--23.41 GHz can be achieved by tuning the optical carrier's wavelength. In addition, the bandwidth can be adjusted to 0.683--2.246 GHz with an out-of-band rejection ratio of more than 26 dB by changing the coupling coefficients of the microring resonator.