Optical power beam splitter

Disclosed in the invention is an optical power beam splitter comprising a substrate, a cladding layer, a lower waveguide layer, and an upper waveguide layer. The cladding layer, the lower waveguide layer, and the upper waveguide layer are successively arranged on the substrate from top to bottom. The upper waveguide layer is a graphic layer; an input waveguide, an alignment lens, a beam shaping lens group, a phase-shifted grating, a Fourier transform lens, a first phase compensation structure, a direct-current component phase shifter, a second phase compensation structure and an output waveguide array are successively etched to the right on the horizontal plane; the thicknesses of the alignment lens, the beam shaping lens group, the phase-shifted grating, the Fourier transform lens, the first phase compensation structure, the direct-current component phase shifter, and the second phase compensation structure are identical; and the thicknesses of the input waveguide and the output waveguide array are identical. According to the invention, Fourier transform is carried out incident light twice from the space domain to the frequency domain and from the frequency domain and the space domain; and multiplication is carried out on the frequency domain and modulation is carried out on the space frequency spectrum to obtain multi-path outputs. The splitter has characteristics of small device size and multiple branches.