Patent ID: 7974504

Claim:
A photonic integrated circuit, comprising: a substrate; an arrayed wavelength grating provided on the substrate and including first and second free space regions, each having first and second ends, and a plurality of first waveguides extending from the first end of the first free space region to the first end of the second free space region; a second waveguide provided on the substrate, the second waveguide coupled to the second end of the second free space region, the second waveguide being configured such that first light travels in the second waveguide in a propagation direction extending away from the second end of the second free space region; and a third waveguide provided on the substrate and having a terminating edge, the third waveguide extending from the second end of the second free space region in the propagation direction to the terminating edge, the third waveguide having a width that narrows in the propagating direction, such that light propagating in the third waveguide is dissipated into the substrate.