PHOTONIC TOPOLOGICAL DUPLEXER BASED ON COUPLED TOPOLOGICAL WAVEGUIDES

The present application discloses a photonic topological duplexer that functions as a delay line and an absorber at different wavelengths based on coupled topological waveguides, comprising a silicon substrate; a plurality of cylindrical air holes distributed on the silicon substrate, and the cylindrical air holes comprising a first and a second cylindrical air hole; the first cylindrical air hole and the second cylindrical air hole form primitive cells arranged in a honeycomb lattice period to form a first valley photonic crystal, and the positions of different cylindrical air holes in the first valley photonic crystal are exchanged to form a second valley photonic crystal; a first topological waveguide and a second topological waveguide are formed between two regions of the first valley photonic crystal and the second valley photonic crystal; the first topological waveguide and the second topological waveguide form coupled topological waveguides with a certain coupling length.