Single-band-pass microwave photon filter with super-wide tuning range

The invention belongs to the technical field of microwave photonics, and particularly relates to a single-band-pass microwave photon filter with a super-wide tuning range based on high-nonlinearity optical fiber stimulated Brillouin scattering effect and multiple pumping signals. The single-band-pass microwave photon filter comprises a laser device, a phase modulator, an isolator, N pumping sources, a coupler, high-nonlinearity optical fibers, a circulator, a detector and a network analyzer. The characteristic of the high-nonlinearity optical fiber stimulated Brillouin scattering effect and the characteristic that phase modulator output signals are opposite in phase and the same in intensity are used, a first-order upper side band output by the phase modulator is enhanced or weakened through the high-nonlinearity optical fiber stimulated Brillouin scattering effect, intensity balance of the first-order upper side band and a first-order lower side band of the signals output by the phase modulator is broken, and accordingly the signals with needed frequency are output in a filter mode. Due to the fact that the number of pumping signals is increased reasonably, stimulated Brillouin gain caused by the high-frequency pumping signals is used for canceling out stimulated Brillouin loss caused by low-frequency pumping signals, and the tuning range of the filter is enlarged.