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FIBER-TO-WAVEGUIDE COUPLERS WITH ULTRA HIGH COUPLING EFFICIENCY AND INTEGRATED CHIP WAVEGUIDES INCLUDING THE SAME

  • US 20180011249A1
  • Filed: 07/11/2017
  • Published: 01/11/2018
  • Est. Priority Date: 07/11/2016
  • Status: Abandoned Application
First Claim
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1. A coupler for coupling a single-mode optical fiber to a single-mode on-chip optical waveguide, comprising:

  • a loosely-confined straight waveguide portion defining a first end configured for positioning adjacent an optical fiber, and a second end; and

    an adiabatic waveguide mode-converter extending from a first end thereof at the second end of the loosely-confined straight waveguide portion to a second end thereof, the second end of the adiabatic waveguide mode-converter configured for positioning adjacent a more-confined waveguide core, the adiabatic waveguide converter tapering from the second end to the first end thereof and configured to serve as a transition between the loosely-confined straight waveguide portion and the more-confined waveguide core.

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