Reconfigurable infinite impulse response (IIR) microwave-photonic filter with controllable selectivity using tunable delay line

A tunable IIR microwave-photonic filter (MPF) with controllable selectivity is implemented using an electrically tunable delay line. The proposed method has been experimentally tested and verified. An IIR Microwave-Photonic filter with variable Q factor in the range of 238 - 257 is realized.