Patent ID: 6549696
Filing Date: 2003-04-15
Classification: G02B

Abstract:
An optical wavelength multiplexer/demultiplexer comprising;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, each of the plurality of channel waveguides differing in length from its neighboring waveguide by a predetermined 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 waveguide; wherein said input slab waveguide or output slab waveguide has one of (i) a temperature compensation material, in its light path, having an opposite sign of refractive index-temperature change to the plurality of channel waveguides and (ii) a material capable of canceling a change in an in-phase plane of light having each wavelength which occurs in the vicinity of the channel waveguide array and the slab waveguide, the material capable of canceling the change being provided in a curved form so that it crosses the light traveling direction, and also has a waveguide element for band width adjustment on which a waveguide to adjust band width of wavelength multiplexing light is provided.