Patent ID: 7542640

Claim:
An arrayed waveguide grating optical multiplexer/demultiplexer comprising: a substrate; and an arrayed waveguide grating formed on said substrate, having two slab waveguides, one arrayed waveguide, a first input/output waveguide including at least one waveguide and a second input/output waveguide-group including a plurality of waveguides, respectively connected to an end facet of one slab waveguide of the two slab waveguides, and a first input/output waveguide including at least one waveguide and a second input/output waveguide-group including a plurality of waveguides, respectively connected to an end facet of the other slab waveguide of the two slab waveguides, wherein said first input/output waveguide connected to the end facet of said one slab waveguide is disposed between the second input/output waveguide-group connected to the end facet of said one slab waveguide and a position where lights are output whose diffracted order are different from lights which are divided into every wavelength and coupled to each waveguide of the second input/output waveguide-group connected to the end facet of said one slab waveguide, in the case of which lights input from the first input/output waveguide connected to the end facet of said other slab waveguide are output from the second input/output waveguide-group connected to the end facet of said one slab waveguide, and said first input/output waveguide connected to the end facet of said other slab waveguide is disposed between the second input/output waveguide-group connected to the end facet of said other slab waveguide and a position where lights are output whose diffracted order are different from lights which are divided into every wavelength and coupled to each waveguide of the second input/output waveguide-group connected to the end facet of said other slab waveguide, in the case of which lights input from the first input/output waveguide connected to the end facet of said one slab wave guide are output from the second input/output waveguide-group connected to the end facet of said other slab waveguide.