A power equalizer, characterized in that the power equalizer comprises: an input/output assembly, a pre-attenuation component, a multiplexer/demultiplexer, an optical conversion component, and a light beam modulator, wherein the input/output assembly is configured to input a first light beam; the pre-attenuation component is configured to separately perform light energy attenuation on a plurality of first sub-wavelength light beams in the first light beam, wherein an amount of light energy attenuation of the first sub-wavelength light beam is related to a wavelength of the first sub-wavelength light beam; the multiplexer/demultiplexer is configured to demultiplex the first light beam passing through the pre-attenuation component such that the plurality of first sub-wavelength light beams disperse, and propagate the plurality of first sub-wavelength light beams to the optical conversion component; the optical conversion component is configured to propagate the plurality of first sub-wavelength light beams to the light beam modulator; the light beam modulator is configured to perform angular deflection on the plurality of first sub-wavelength light beams to obtain a plurality of second sub-wavelength light beams; the optical conversion component is further configured to propagate the plurality of second sub-wavelength light beams to the multiplexer/demultiplexer; the multiplexer/demultiplexer is further configured to multiplex the plurality of second sub-wavelength light beams into a second light beam; the pre-attenuation component is further configured to propagate the second light beam to the input/output assembly; and the input/output assembly is further configured to output the second light beam. an input/output assembly, a pre-attenuation component, a multiplexer/demultiplexer, an optical conversion component, and a light beam modulator, wherein the input/output assembly is configured to input a first light beam; the pre-attenuation component is configured to separately perform light energy attenuation on a plurality of first sub-wavelength light beams in the first light beam, wherein an amount of light energy attenuation of the first sub-wavelength light beam is related to a wavelength of the first sub-wavelength light beam; the multiplexer/demultiplexer is configured to demultiplex the first light beam passing through the pre-attenuation component such that the plurality of first sub-wavelength light beams disperse, and propagate the plurality of first sub-wavelength light beams to the optical conversion component; the optical conversion component is configured to propagate the plurality of first sub-wavelength light beams to the light beam modulator; the light beam modulator is configured to perform angular deflection on the plurality of first sub-wavelength light beams to obtain a plurality of second sub-wavelength light beams; the optical conversion component is further configured to propagate the plurality of second sub-wavelength light beams to the multiplexer/demultiplexer; the multiplexer/demultiplexer is further configured to multiplex the plurality of second sub-wavelength light beams into a second light beam; the pre-attenuation component is further configured to propagate the second light beam to the input/output assembly; and the input/output assembly is further configured to output the second light beam.