Patent ID: 7801402

Claim:
A photonic integrated circuit chip comprising: a substrate; a plurality of semiconductor layers provided on the substrate; a wavelength selective decombiner provided on a first one of the plurality of semiconductor layers, the wavelength selective decombiner including first and second elliptical gratings, the first elliptical grating being configured to intersect the second elliptical grating at a plurality of open regions where the first and second elliptical gratings are discontinuous, the wavelength selective decombiner configured to receive a multi-wavelength signal and demultiplex the multi-wavelength signal into a plurality of signal channels; and a plurality of waveguides provided on a second one of the plurality of semiconductor layers, a first of the plurality of waveguides configured to receive a first of the plurality of signal channels from the first elliptical grating and a second of the plurality of waveguides configured to receive a second of the plurality of signal channels from the second grating.