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Advanced Coupling Technologies for Planar and Strip Waveguides

  • Thomas Fricke-BegemannEmail author
  • Jürgen Ihlemann
Chapter
  • 1.4k Downloads
Part of the Springer Series in Optical Sciences book series (SSOS, volume 189)

Abstract

Grating couplers are frequently used to couple free-space beams to thin-film waveguides on planar substrates. We use finite element method (FEM) simulations to analyze the effect of experimental parameters on coupling efficiency and to optimize the grating design for specific applications. Grating fabrication is demonstrated by direct laser ablation using a UV-laser processing system at 157 nm wavelength. As a novel coupling technique, we propose to use external gratings fabricated on the end face of a collimating micro lens or immediately on the exit face of an optical fiber to couple light from a single-mode fiber directly to planar or strip waveguides. FEM simulations and experimental results show that the new technique can provide similar coupling efficiencies as common internal grating couplers. The external couplers can be repeatedly reused and eliminate the need for conventional internal grating couplers, which induce a major part of the production costs and impose certain restrictions on the waveguide devices.

Keywords

Coupling Efficiency Transversal Electric Evanescent Field Total Internal Reflection Fluorescence Grating Coupler 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors thank A. Selle for conducting some parts of the FEM calculations and acknowledge financial support by the German Ministry of Economics and Technology.

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.Department of NanostructuresLaser-Laboratorium Göttingen e.V.GöttingenGermany

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