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Optics Letters

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  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 7 — Apr. 1, 2014
  • pp: 2206–2209

Experimental demonstration of polarization-insensitive air-cladding grating couplers for silicon-on-insulator waveguides

Zhenzhou Cheng and Hon Ki Tsang  »View Author Affiliations


Optics Letters, Vol. 39, Issue 7, pp. 2206-2209 (2014)
http://dx.doi.org/10.1364/OL.39.002206


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Abstract

We present an air-cladding apodized focusing subwavelength grating that can effectively couple two polarizations into a single waveguide. For the transverse magnetic mode, 3.2dB maximum coupling efficiency with 28nm 1 dB bandwidth is achieved. With the same grating, 4.3dB maximum coupling efficiency with 58nm 1 dB bandwidth is achieved for the transverse electric mode. The minimum difference between two polarizations’ coupling peaks is demonstrated to be 32nm. At the 1525 nm wavelength range, the polarization-insensitive grating is demonstrated with 6.5dB coupling efficiency. The polarization-insensitive coupling wavelength can be controlled experimentally.

© 2014 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:
Optical Devices

History
Original Manuscript: January 13, 2014
Revised Manuscript: March 6, 2014
Manuscript Accepted: March 12, 2014
Published: March 31, 2014

Citation
Zhenzhou Cheng and Hon Ki Tsang, "Experimental demonstration of polarization-insensitive air-cladding grating couplers for silicon-on-insulator waveguides," Opt. Lett. 39, 2206-2209 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-7-2206


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