Patent ID: 7526151

Claim:
An optical circuit, comprising: a substrate; a layer provided on the substrate, the layer having a first refractive index; an optical coupler provided on the layer, the optical coupler including a first waveguide and a second waveguide, the first and second waveguides being spaced from one another by a distance sufficient to facilitate optical coupling between the first and second waveguides; a plurality of third waveguides provided on the layer, the plurality of third waveguides being provided on a first side of the optical coupler; and a plurality of fourth waveguides provided on the layer, the plurality of fourth waveguides being provided on a second side of the optical coupler opposite the first side of the optical coupler, wherein, each of the first and second waveguides, each of the plurality of third waveguides, and each of the plurality of fourth waveguides have a second refractive index greater than the first refractive index, each of the plurality of third waveguides being spaced from one another and the first and second waveguides, each of the plurality of fourth waveguides being spaced from one another and the first and second waveguides, each of the plurality of third waveguides terminating at corresponding first and second end portions thereof, and each of the plurality of fourth waveguides terminating at corresponding first and second end portions thereof.