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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 38, Iss. 18 — Sep. 15, 2013
  • pp: 3588–3591

Colorless grating couplers realized by interleaving dispersion engineered subwavelength structures

Xiaochuan Xu, Harish Subbaraman, John Covey, David Kwong, Amir Hosseini, and Ray T. Chen  »View Author Affiliations


Optics Letters, Vol. 38, Issue 18, pp. 3588-3591 (2013)
http://dx.doi.org/10.1364/OL.38.003588


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Abstract

We investigate the waveguide dispersion of subwavelength structures, and propose that the waveguide dispersion can be reduced by reducing the period of subwavelength structures. A 3 dB bandwidth increment of 20% has been observed by introducing this concept into previously demonstrated grating couplers. To fully exploit the bandwidth merits of the structures, gratings with interleaved subwavelength structures were designed and fabricated. Two typical types of interleaving geometries have been investigated. Both demonstrated a 1 dB bandwidth 70nm, a 3 dB bandwidth 117nm, and a peak efficiency 5.1dB at 1570 nm for transverse-electric polarized light. The simulation confirms that the dispersion engineering adds an extra 12 nm to the 1 dB bandwidth.

© 2013 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(130.3120) Integrated optics : Integrated optics devices
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Diffraction and Gratings

History
Original Manuscript: August 6, 2013
Manuscript Accepted: August 12, 2013
Published: September 9, 2013

Citation
Xiaochuan Xu, Harish Subbaraman, John Covey, David Kwong, Amir Hosseini, and Ray T. Chen, "Colorless grating couplers realized by interleaving dispersion engineered subwavelength structures," Opt. Lett. 38, 3588-3591 (2013)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-38-18-3588


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