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Proceedings Paper

Ultra wideband integrated polarization splitter/combiner using electro-optic effect in GaAs
Author(s): Mohamed A. Swillam; Mohamed H. Bakr; Xun Li
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Paper Abstract

We propose a novel design of integrated polarization splitter/combiner with ultra wide bandwidth. The proposed design utilizes the electro-optic (Pockels) effect in GaAs for splitting the polarizations. It also exploits the self imaging phenomenon in MMI couplers with a parabolic index distribution in the vertical direction to significantly increase the bandwidth. A stair case index approximation of this index profile is utilized to facilitate the fabrication process. The fabrication of this profile is feasible through the current technology using multiple etching. Our proposed design maintains a variation of less than 0.5 dB in the power coupling over a bandwidth of 400 nm. We also propose a novel approach for design optimization of the proposed structure. This approach is capable of extracting the propagation constants and their gradient with respect to all the design parameters. This allows for using gradient-based optimization The computational time of this optimization procedure is only a fraction of that for other recently proposed approaches.

Paper Details

Date Published: 21 February 2011
PDF: 6 pages
Proc. SPIE 7933, Physics and Simulation of Optoelectronic Devices XIX, 79330V (21 February 2011); doi: 10.1117/12.873484
Show Author Affiliations
Mohamed A. Swillam, Univ. of Toronto (Canada)
Mohamed H. Bakr, McMaster Univ. (Canada)
Xun Li, McMaster Univ. (Canada)

Published in SPIE Proceedings Vol. 7933:
Physics and Simulation of Optoelectronic Devices XIX
Bernd Witzigmann; Fritz Henneberger; Yasuhiko Arakawa; Alexandre Freundlich, Editor(s)

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