Arrayed waveguide type wavelength demultiplexer and a method of manufacturing

The present invention aims at providing an array waveguide type wavelength demultiplexer and low transmission loss at the flat transmission region. To achieve the above object, an array waveguide type wavelength demultiplexer according to the present invention includes at least one or more single-mode input channel waveguide in a waveguide on a substrate, an input slab waveguide, a predetermined conductive a channel waveguide array comprising a plurality of single-mode waveguide having a waveguide length difference, an output slab waveguide, multimode output channel waveguides and successively longitudinal genus connected arrayed waveguide type wavelength demultiplexer it is.