INTEGRATED GRATING COUPLER AND POWER SPLITTER

摘要

An optical device is provided for coupling an external optical signal into a plurality of on-chip photonic sub-circuits provided on a substrate. The optical device comprises: a planar waveguide layer on the substrate; a diverging grating coupler configured to couple the external optical signal to the waveguide layer and to thereby create an on-chip diverging optical beam in the waveguide layer; and a plurality of channel waveguides formed in the waveguide layer. Each of the plurality of channel waveguides comprises a waveguide transition structure having a waveguide aperture oriented towards the grating coupler. For each of the plurality of channel waveguides the position and the width of the corresponding waveguide aperture and the angle and the shape of the waveguide transition structure are individually selected to capture a predetermined portion of the on-chip diverging optical beam.