Microwave photon filter based on chirp optical fiber grating and doping active optical fiber

The invention discloses an active optical fiber-doped chirped microwave photonic filter. The connection of components of the active optical fiber-doped chirped microwave photonic filter is as follows: an output end of a laser (10) and an output end of an audio-frequency signal generator (20) are connected with two input ends of a modulator (30) respectively; an output end of the modulator is connected with one input end of an optical fiber coupler (40) the other input end of which is connected with a first port of an optical fiber circulator (50); a second port of the optical fiber circulator is connected with one end which is doped with active optical fibers, and the other end which is doped with the active optical fibers is connected with an output end of a wavelength division multiplexer (70); a third port of the optical fiber circulator is connected in series with N fiber gratings; and one input end of the wavelength division multiplexer is connected with a pumping source (80), and the other input end of