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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 15 — Jul. 28, 2014
  • pp: 18224–18231

Focusing-curved subwavelength grating couplers for ultra-broadband silicon photonics optical interfaces

Qiuhang Zhong, Venkat Veerasubramanian, Yun Wang, Wei Shi, David Patel, Samir Ghosh, Alireza Samani, Lukas Chrostowski, Richard Bojko, and David V. Plant  »View Author Affiliations

Optics Express, Vol. 22, Issue 15, pp. 18224-18231 (2014)

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We report on the design and characterization of focusing-curved subwavelength grating couplers for ultra-broadband silicon photonics optical interfaces. With implementation of waveguide dispersion engineered subwavelength structures, an ultra-wide 1-dB bandwidth of over 100 nm (largest reported to date) near 1550 nm is experimentally achieved for transverse-electric polarized light. By tapering the subwavelength structures, back reflection is effectively suppressed and grating coupling efficiency is increased to −4.7 dB. A compact device footprint of 40 µm × 20 µm is realized by curving the gratings in a focusing scheme.

© 2014 Optical Society of America

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

ToC Category:
Integrated Optics

Original Manuscript: May 15, 2014
Revised Manuscript: June 28, 2014
Manuscript Accepted: July 11, 2014
Published: July 21, 2014

Qiuhang Zhong, Venkat Veerasubramanian, Yun Wang, Wei Shi, David Patel, Samir Ghosh, Alireza Samani, Lukas Chrostowski, Richard Bojko, and David V. Plant, "Focusing-curved subwavelength grating couplers for ultra-broadband silicon photonics optical interfaces," Opt. Express 22, 18224-18231 (2014)

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