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OPTICAL COUPLER HAVING EXPOSED SUBWAVELENGTH GRATINGS FOR COUPLING ELECTROMAGNETIC FIELD

  • US 20190170936A1
  • Filed: 11/09/2018
  • Published: 06/06/2019
  • Est. Priority Date: 11/01/2016
  • Status: Active Grant
First Claim
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1. An optical coupler, comprising:

  • a semiconductor substrate;

    a first cladding layer arranged at least partly over the semiconductor substrate;

    a second cladding layer arranged at least partly over the first cladding layer with respect to the semiconductor substrate;

    a facet in the first cladding layer and in the second cladding layer, the facet extending substantially in a lateral direction; and

    a plurality of waveguides arranged over the first cladding layer with respect to the semiconductor substrate,wherein the plurality of waveguides comprises;

    a first waveguide comprising a plurality of first spaced-apart segments arranged substantially along a longitudinal direction;

    a second waveguide; and

    a third waveguide spaced farther from the facet longitudinally than at least one of the first waveguide and the second waveguide; and

    wherein at least two of the waveguides of the plurality of waveguides;

    are at least partly encapsulated in the second cladding layer;

    have respective refractive indices higher than a refractive index of the second cladding layer; and

    are spaced apart from each other along the lateral direction.

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