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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 34, Iss. 9 — May. 1, 2009
  • pp: 1408–1410

Waveguide grating coupler with subwavelength microstructures

Robert Halir, Pavel Cheben, Siegfried Janz, Dan-Xia Xu, Íñigo Molina-Fernández, and Juan G. Wangüemert-Pérez  »View Author Affiliations

Optics Letters, Vol. 34, Issue 9, pp. 1408-1410 (2009)

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We propose a silicon waveguide-fiber grating coupler that uses a subwavelength microstructure to achieve a continuously variable grating strength yet can be fabricated using only a single etch step. By adjusting the subwavelength microstructure at every point along the grating, the grating coupler can be optimized to give high field overlap with the optical fiber mode and also minimize backreflections along the incident waveguide path. Our design example is optimized for quasi-TM mode in a silicon photonic-wire waveguide, as required for waveguide evanescent-field-sensing applications. A field overlap of up to 94% with a standard single-mode optical fiber (SMF-28) is achieved by coupler apodization. Backreflection from the grating is reduced to 0.1 % , and the total predicted photonic wire to fiber coupling efficiency is 50%.

© 2009 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(130.0130) Integrated optics : Integrated optics
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Diffraction and Gratings

Original Manuscript: February 9, 2009
Revised Manuscript: April 1, 2009
Manuscript Accepted: April 4, 2009
Published: April 24, 2009

Robert Halir, Pavel Cheben, Siegfried Janz, Dan-Xia Xu, Íñigo Molina-Fernández, and Juan G. Wangüemert-Pérez, "Waveguide grating coupler with subwavelength microstructures," Opt. Lett. 34, 1408-1410 (2009)

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