| 摘要 |
At least one input waveguide, plural output waveguides, an arrayed waveguide diffraction grating composed of plural channel waveguides successively extending in a length by DELTAL, an input slab waveguide for connecting the input waveguide with the arrayed waveguide diffraction grating, and an output slab waveguide for connecting the arrayed waveguide diffraction grating with the output waveguides are respectively formed on a substrate. An interval between central axes of the adjacent channel waveguides composing the arrayed waveguide diffraction grating slowly varies through the whole channel waveguides on one or both of the input and output ends of the arrayed waveguide diffraction grating.
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