Wavelength division multiplexing and de-multiplexing element and wavelength router

摘要

The present invention has an object to provide a wavelength division demultiplexer having high wavelength dispersion properties using a fine photonic crystal. The wavelength router has a wavelength division demultiplexer for each of a plurality of input ports, and a wavelength division multiplexer for each of a plurality of output ports. The wavelength division demultiplexer and wavelength division multiplexer are formed of a phonotic crystal. The shapes of the entrance surface and exit surface of the photonic crystal are different. The second boundary of the wavelength division demultiplexer and first boundary of the wavelength division multiplexer are of a curved surface.