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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 12 — Jun. 4, 2012
  • pp: 13470–13477

Colorless directional coupler with dispersion engineered sub-wavelength structure

R. Halir, A. Maese-Novo, A. Ortega-Moñux, I. Molina-Fernández, J. G. Wangüemert-Pérez, P. Cheben, D.-X. Xu, J. H. Schmid, and S. Janz  »View Author Affiliations

Optics Express, Vol. 20, Issue 12, pp. 13470-13477 (2012)

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Directional couplers are extensively used devices in integrated optics, but suffer from limited operational wavelength range. Here we use, for the first time, the dispersive properties of sub-wavelength gratings to achieve a fivefold enhancement in the operation bandwidth of a silicon-on-insulator directional coupler. This approach does not compromise the size or the phase response of the device. The sub-wavelength grating based directional coupler we propose covers a 100nm bandwidth with an imbalance of ≤ 0.6dB between its outputs, as supported by full 3D FDTD simulations.

© 2012 OSA

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(230.7370) Optical devices : Waveguides
(260.2030) Physical optics : Dispersion
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Integrated Optics

Original Manuscript: March 6, 2012
Revised Manuscript: March 26, 2012
Manuscript Accepted: March 27, 2012
Published: May 31, 2012

R. Halir, A. Maese-Novo, A. Ortega-Moñux, I. Molina-Fernández, J. G. Wangüemert-Pérez, P. Cheben, D.-X. Xu, J. H. Schmid, and S. Janz, "Colorless directional coupler with dispersion engineered sub-wavelength structure," Opt. Express 20, 13470-13477 (2012)

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