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PHOTONIC INTEGRATED CIRCUIT HAVING A WAVEGUIDE-GRATING COUPLER

  • US 20110150386A1
  • Filed: 12/17/2009
  • Published: 06/23/2011
  • Est. Priority Date: 12/17/2009
  • Status: Active Grant
First Claim
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1. An apparatus, comprising:

  • a first optical waveguide being supported on a surface of a substrate;

    a second optical waveguide being supported over the surface;

    an optical coupler being supported over the surface and optically coupling the first and second waveguides; and

    a waveguide grating being supported over the surface and being adapted to transfer optical power between one or more waveguide modes of the second waveguide and an optical beam formed by or applied to the waveguide grating, wherein the second waveguide has an offset-transition region for which a core of the second waveguide has an offset distance that gradually changes from a first distance corresponding to the optical coupler to a different second distance.

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