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Proceedings Paper

Low-loss curved subwavelength grating waveguide based on index engineering
Author(s): Zheng Wang; Xiaochuan Xu; D. L. Fan; Yaoguo Wang; Ray T. Chen
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Paper Abstract

Subwavelength grating (SWG) waveguide is an intriguing alternative to conventional optical waveguides due to its freedom to tune a few important waveguide properties such as dispersion and refractive index. Devices based on SWG waveguide have demonstrated impressive performances compared to those of conventional waveguides. However, the large loss of SWG waveguide bends jeopardizes their applications in integrated photonics circuits. In this work, we propose that a predistorted refractive index distribution in SWG waveguide bends can effectively decrease the mode mismatch noise and radiation loss simultaneously, and thus significantly reduce the bend loss. Here, we achieved the pre-distortion refractive index distribution by using trapezoidal silicon pillars. This geometry tuning approach is numerically optimized and experimentally demonstrated. The average insertion loss of a 5 μm SWG waveguide bend can be reduced drastically from 5.58 dB to 1.37 dB per 90° bend for quasi-TE polarization. In the future, the proposed approach can be readily adopted to enhance performance of an array of SWG waveguide-based photonics devices.

Paper Details

Date Published: 15 March 2016
PDF: 7 pages
Proc. SPIE 9753, Optical Interconnects XVI, 975318 (15 March 2016); doi: 10.1117/12.2213913
Show Author Affiliations
Zheng Wang, The Univ. of Texas at Austin (United States)
Xiaochuan Xu, Omega Optics, Inc. (United States)
D. L. Fan, The Univ. of Texas at Austin (United States)
Yaoguo Wang, The Univ. of Texas at Austin (United States)
Ray T. Chen, The Univ. of Texas at Austin (United States)
Omega Optics, Inc. (United States)

Published in SPIE Proceedings Vol. 9753:
Optical Interconnects XVI
Henning Schröder; Ray T. Chen, Editor(s)

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