An out-of-plane grating coupler for efficient butt-coupling between compact planar waveguides and single-mode fibres

D Taillaert, W Bogaerts, P Bienstman, Thomas Fraser Krauss, P van Daele, I Moerman, S Verstuyft, K DeMesel, R Baets

Research output: Other contribution

545 Citations (Scopus)

Abstract

We have designed and fabricated an out-of-plane coupler for butt-coupling from fiber to compact planar waveguides. The coupler is based on a short second-order grating or photonic crystal, etched in a waveguide with a low-index oxide cladding. The coupler is optimized using mode expansion-based simulations. Simulations using a 2-D model show that up to 74% coupling efficiency between single-mode fiber and a 240-nm-thick GaAs-AlOx waveguide is possible. We have measured 19% coupling efficiency on test structures.

Original languageEnglish
Volume38
Publication statusPublished - Jul 2002

Keywords

  • integrated optics
  • optical planar waveguide components
  • waveguide coupler
  • PERFECTLY MATCHED LAYERS
  • PHOTONIC CRYSTALS
  • OUTCOUPLERS

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