Patent ID: 6985657

Claim:
An arrayed waveguide-type wavelength multiplexing/demultiplexing device comprising, on a substrate; one or a plurality of input waveguides for propagating and outputting wavelength-multiplexed light multiplexed with a plurality of wavelengths; a first slab for diffusing said wavelength-multiplexed light outputted from said input waveguide; a channel waveguide array, which has a plurality of channel waveguides of different lengths for separating the wavelength-multiplexed light, diffused by said first slab according to said plurality of wavelengths, into a plurality of separated lights and causing said separated lights to propagate; a second slab for condensing said plurality of separated lights having propagated through said channel waveguide array; and one or a plurality of output waveguides for causing said lights condensed by said second slab to propagate, wherein a waveguide interval in at least either first neighborhoods of said respective channel waveguides to be connected to said first slab or second neighborhoods of said respective channel waveguides to be connected to said second slab is set to become wider than a first waveguide interval in a first connection section for connecting, said channel waveguide array to said first slab or as second waveguide interval in a second connection section for connecting said channel waveguide array to said second slab, said first or second neighborhood of at least one of said plurality of channel waveguides is formed from a plurality of waveguides having geometries of different degrees of flex for said respective channel waveguides, and curvature radii of respective S-shaped waveguides serving as said plurality of channel waveguides are made smaller from a center channel waveguide of said plurality of channel waveguides toward an outer channel waveguide.