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Germanium photodetector with extended responsivity

  • US 10,446,699 B2
  • Filed: 07/28/2017
  • Issued: 10/15/2019
  • Est. Priority Date: 07/28/2017
  • Status: Active Grant
First Claim
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1. A photonic system, comprising:

  • a silicon substrate that includes a waveguide, wherein the silicon substrate has a polygon shaped geometry comprising multiple sides;

    an optical detector optically coupled to the waveguide, the optical detector comprising;

    a germanium layer disposed on the silicon substrate; and

    a plurality of electrical contacts contacting at least one of the silicon substrate and the germanium layer;

    a resistive element thermally coupled to the optical detector such that a current flowing through the resistive element controls a temperature of the optical detector, the resistive element comprising at least two sides that are adjacent to at least two respective sides of the multiple sides of the silicon substrate; and

    a bridge that couples the respective adjacent sides of the resistive element and the silicon substrate.

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