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Broadband fiber-chip zero-order surface grating coupler with 0.4 dB efficiency

Broadband fiber-chip zero-order surface grating coupler with 0.4 dB efficiency

Alejandro Sánchez-Postigo, J. Gonzalo Wangüemert-Pérez, José Manuel Luque-González, Íñigo Molina-Fernández, Pavel Cheben, Carlos A. Alonso-Ramos, Robert Halir, Jens H. Schmid, and Alejandro Ortega-Moñux

Author Affiliations

Alejandro Sánchez-Postigo,1,* J. Gonzalo Wangüemert-Pérez,1 José Manuel Luque-González,1 Íñigo Molina-Fernández,1 Pavel Cheben,2 Carlos A. Alonso-Ramos,3 Robert Halir,1 Jens H. Schmid,2 and Alejandro Ortega-Moñux1

1Universidad de Málaga, Departamento de Ingeniería de Comunicaciones, ETSI Telecomunicación, Campus de Teatinos s/n, 29071 Málaga, Spain

2National Research Council Canada, 1200 Montreal Road, Bldg. M50, Ottawa K1A 0R6, Canada

3Institut d’Electronique Fondamentale, Université Paris Sud, CNRS, UMR 8622, Université Paris-Saclay, Bât. 220, 91405 Orsay Cedex, France

*Corresponding author: asp@ic.uma.es

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Abstract

Surface grating couplers enable efficient coupling of light between optical fibers and nanophotonic waveguides. However, in conventional grating couplers, the radiation angle is intrinsically wavelength dependent, thereby limiting their operation bandwidth. In this Letter, we present a zero-order surface grating coupler in silicon-on-insulator which overcomes this limitation by operating in the subwavelength regime. By engineering the effective refractive index of the grating region, both high coupling efficiency and broadband operation bandwidth are achieved. The grating is assisted by a silicon prism on top of the waveguide, which favors upward radiation and minimizes power losses to substrate. Using a linear apodization, our design achieves a coupling efficiency of 91% ( − 0.41   dB ) and a 1-dB bandwidth of 126 nm.

© 2016 Optical Society of America

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