| 摘要 |
An optical wavelength multiplexer/demultiplexer including a substrate, an input channel waveguide provided on the substrate, an input slab waveguide of which one end is connected to the input channel waveguide, a channel waveguide array of which one side is connected to the other side of the input slab waveguide and which has a plurality of channel waveguides, the plurality of channel waveguides each of which differs in length from its neighboring waveguide by redetermined amount, an output slab waveguide of which one side is connected to the other side of the channel waveguide array, and a plurality of output channel waveguides which are connected to the other side of the output slab wave guide, said input slab waveguide or output slab waveguide having a temperature compensation material, in its light path, having an opposite sign of diffraction temperature change to the plurality of channel wave guides, a material capable of canceling change in in-phase plane of light having each wavelength which occurs on a vicinity of the channel waveguide array and the slab waveguide, the material being provided in the curved form so that it may cross the light traveling direction, or a waveguide element for band width adjustment on which a waveguide to adjust band width of wavelength multiplexing light is provided. According to the optical wavelength multiplexer/demultiplexer of the invention, the following advantages can be obtained; an angle in the in-phase plane of output light in the channel waveguide array is not changed regardless of the temperature change around the channel waveguide array, the increase of the loss is restrained, the most optimized spectrum response is provided, a setting of the center wavelength is finely adjusted, the electric field distribution is most optimized, the band width is expanded, the flatter loss is reduced, and the cross-talk is reduced.
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