Microwave Photonic Filter with user-defined reconfigurability and high frequency-selectivity

We propose and experimentally demonstrate a user-defined time-varying microwave photonic filtering system that enables versatile electronic reconfigurability of its spectral response at a very high speed (~1.3 GHz) over a 40-GHz full frequency bandwidth and with a frequency resolution approaching its fundamental limit (filter’s tuning speed). The system's performance is validated through the successful mitigation of time-varying frequency interferences in a non-stationary broadband microwave signal, showcasing its capability for fully reconfigurable and user-defined signal manipulation. The proposed method holds great potential for software-defined communication and advanced coding technology.