Optical fiber filter

The utility model relates to an optical fiber filter, which solves the technical problem by providing an optical fiber filter which has function of smoothing waveform, so as to fill the gap in the market. The optical fiber filter is characterized in that an optical module mainly comprises an energy compensator and an opal diffuse glass, wherein the energy compensator mainly comprises a pumping laser, a circulator, a filter, a wavelength division multiplexer and a doped fiber; an input port of the circulator is served as a signal light input end while an output port thereof is served as a signal light output port to be connected with follow-up equipment; an intermediate port of the circulator passes is connected with the signal end of the wavelength division multiplexer; the output end of the wavelength division multiplexer is connected with the doped fiber to be served as the connecting end of the opal diffuse glass; and the pumping end of the wavelength division multiplex is connected with the pumping laser.