Arrayed waveguide grating circuit

An arrayed waveguide grating circuit, comprising:

• a first slab waveguide connected to a first input waveguide and second output waveguides at one face;
• a second slab waveguide connected to first output waveguides and a second input waveguide at one face;
• and
• an array waveguide that connects the other face opposed to the one face of the first slab waveguide to the other face opposed to the one face of the second slab waveguide,
• wherein the first input waveguide is connected to the first slab waveguide and is positioned with a second interval to an outermost second output waveguide among the second output waveguides connected to the one face of the first slab waveguide with a first interval depending on a wavelength, and
• wherein the second input waveguide is connected to the second slab waveguide and is positioned with a second interval to an outermost first output waveguide among the first output waveguides connected to the one face of the second slab waveguide with a first interval depending on a wavelength.