Design of a microwave photonic filter using phase-shifted FBG-based delay lines and IIR filtering technique for photonic integrated circuits

Abstract An efficient approach for the design of wideband microwave photonic filter (MWPF) using phase-shifted fiber Bragg gratings (FBGs) and the pole-zero placement technique is demonstrated. An infinite impulse response (IIR) filtering framework is employed to significantly reduce the number of filter components. The optimized filter coefficients are constrained to be real and treated as the reflectivities of π-phase-shifted FBGs arranged in a serial feedback configuration. Highpass and bandp