Abstract: An optical splitter includes an optical input waveguide and an optical splitting waveguide, and the optical input waveguide is configured to receive an optical signal. The optical splitting waveguide includes a first optical splitting waveguide and a plurality of second optical splitting waveguides. The first optical splitting waveguide and the second optical splitting waveguide are coplanar. The first optical splitting waveguide includes a first connection segment connected to the optical input waveguide, and the first connection segment is in a straight-line shape such that optical splitting can be disposed in a low-energy region of the optical signal.