Fig. 1. Schematic of microwave photonic filter. (a) Link diagram; (b) frequency spectra of different points in link

Fig. 2. Add-Drop microring resonator based on MZI structure. (a) Waveguide cross-section of double stripe silicon nitride waveguide; (b) schematic of microring resonator

Fig. 3. Comparison of experimental and simulation results. (a) Transmission spectra of microring resonator; (b) frequency spectral response of microwave photonic filter

Fig. 4. Frequency tuning of microwave photonic filter

Fig. 5. Measured results under different electrical powers. (a) Transmission spectra of microring; (b) frequency spectra of microwave photonic filter; (c) variations of suppression ratios of microring and microwave photonic filter with electrical power; (d) variations of bandwidths of microring and microwave photonic filter with electrical power