WAVELENGTH DIVISION MULTIPLEXER/DEMULTIPLEXER

摘要

PURPOSE: A wavelength division multiplexer/demultiplexer is provided to prevent an interference phenomenon between neighboring channels by increasing and reducing the width of an input waveguide. CONSTITUTION: A wavelength division multiplexer/demultiplexer includes a grating for demultiplexing multiplexed optical signal to each channel, a plurality of input waveguides for inputting optical signals into the grating, and a plurality of output waveguides for outputting the demultiplexed channels. The input waveguide(413) of the wavelength division multiplexer/demultiplexer includes a first sub-waveguide and a second sub-waveguide. The width of the first sub-waveguide(413a) is increased along with the traveling direction of the optical signals. The width of the second sub-waveguide(413b) is reduced along the traveling direction of the optical signals passing the first sub-waveguide.