Fig. 1. Topological structure diagram of reconfigurable microwave photonic filter based on an optical recirculating frequency shifting loop

Fig. 2. Schematic diagram of microwave photonic filter tap number and FSR reconfigurability based on optical recirculating frequency shifting loop

Fig. 3. Schematic diagram of the recirculating frequency shifting loop

Fig. 4. Optical spectra of the initial signal and the signal after being single-sideband modulated

Fig. 5. Transmission spectrum of the tunable optical filter and the optical frequency comb generated by the recirculating frequency shifting loop

Fig. 6. The schematic diagram of the reconfigurable MPF

Fig. 7. Verifications of the tap number reconfigurability of the MPF

Fig. 8. Verifications of the FSR reconfigurability of the MPF