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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 17 — Sep. 1, 2012
  • pp: 3663–3665

Polarization-independent grating coupler for micrometric silicon rib waveguides

C. Alonso-Ramos, L. Zavargo-Peche, A. Ortega-Moñux, R. Halir, I. Molina-Fernández, and P. Cheben  »View Author Affiliations

Optics Letters, Vol. 37, Issue 17, pp. 3663-3665 (2012)

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Grating couplers are a promising approach to implement efficient fiber–chip coupling. However, their strong polarization dependence makes dual-polarization operation challenging. In this Letter we propose, for the first time, a polarization-independent grating coupler for thick rib silicon-on-insulator (SOI) waveguides. Coupling efficiency is optimized by designing the grating pitch and duty cycle, without varying the bottom oxide thickness, which significantly simplifies practical implementation. Directivity of the grating coupler is enhanced by a high reflectivity layer under the bottom oxide after the selective removal of the Si substrate. Dual-polarization coupling efficiency of 2.8dB is shown.

© 2012 Optical Society of America

OCIS Codes
(230.1950) Optical devices : Diffraction gratings
(230.3120) Optical devices : Integrated optics devices
(230.7390) Optical devices : Waveguides, planar

ToC Category:
Diffraction and Gratings

Original Manuscript: May 29, 2012
Revised Manuscript: July 26, 2012
Manuscript Accepted: July 26, 2012
Published: August 29, 2012

C. Alonso-Ramos, L. Zavargo-Peche, A. Ortega-Moñux, R. Halir, I. Molina-Fernández, and P. Cheben, "Polarization-independent grating coupler for micrometric silicon rib waveguides," Opt. Lett. 37, 3663-3665 (2012)

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