Patent ID: 8588565

Claim:
An apparatus, comprising: a first waveguide grating; a first plurality of waveguides connected to the first waveguide grating, wherein: the first plurality comprises a first waveguide and a second waveguide collinear with the first waveguide at the first waveguide grating; and the first waveguide grating is configured to split optical power of a first polarization of a first optical signal applied to the first waveguide grating and couple the optical power of the first polarization of the first optical signal into the first and second waveguides; and a first optical coupler, wherein: the first and second waveguides are connected to a first side of the first optical coupler; the first waveguide has a first length between the first waveguide grating and the first optical coupler; and the second waveguide has a second length between the first waveguide grating and the first optical coupler, the second length being different from the first length.