Patent ID: 6195481
Filing Date: 2001-02-27
Classification: G02B

Abstract:
An arrayed waveguide grating type optical multiplexer/demultiplexer comprising:an input waveguide;an input-side slab waveguide connected to an end portion of said input waveguide;a diffraction grating including arrayed channel waveguides connected to said input-side slab waveguide;an output-side slab waveguide connected to said arrayed waveguides diffraction grating; andoutput waveguides having end portions connected to said output-side slab waveguide,wherein a junction between said input waveguide and said input-side slab waveguide or between each said output waveguide and said output-side slab waveguide is tapered in a manner such that the end portion of said input or output waveguides gradually widens in a width direction of path toward said input-side or output-side slab waveguide, andthe junction includes two separate small-width waveguide portions separate from the end portion of said input or output waveguide and extending in a line with taper of the tapered end portion, and a single large-width waveguide portion separate from the small-width waveguide portions.