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Proceedings Paper

Compact and efficient large cross-section SOI rib waveguide taper optimized by a genetic algorithm
Author(s): Yujin Liu; Xi Wang; Ying Dong; Xiaohao Wang
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Paper Abstract

A genetic algorithm is applied to optimize a taper between a large cross-section silicon-on-insulator (SOI) rib waveguide and a single-mode fiber to achieve an ultra-compact and highly efficient coupling structure. The coupling efficiency is taken as the objective function of the genetic algorithm in the taper optimization process. To apply the optimization algorithm, the taper is segmented into several sections. Three encoding forms and a two-step optimization strategy are adopted in the optimization process, resulting in a 10μm long taper with a coupling efficiency of 93.30% in quasi-TE mode at 1550nm. The characteristics of the optimized taper including the field profile, spectrum and fabrication tolerances in both horizontal and vertical directions are investigated via a three dimensional eigenmode expansion (EME) method, indicating that the optimized taper is compatible with the prevailing integrated circuit (IC) processing technology.

Paper Details

Date Published: 5 January 2017
PDF: 10 pages
Proc. SPIE 10244, International Conference on Optoelectronics and Microelectronics Technology and Application, 1024424 (5 January 2017); doi: 10.1117/12.2264428
Show Author Affiliations
Yujin Liu, Tsinghua Univ. (China)
Xi Wang, Tsinghua Univ. (China)
Ying Dong, Tsinghua Univ. (China)
Xiaohao Wang, Tsinghua Univ. (China)
Tsinghua-Berkeley Shenzhen Institute (China)

Published in SPIE Proceedings Vol. 10244:
International Conference on Optoelectronics and Microelectronics Technology and Application
Shaohua Yu; Jose Capmany; Yi Luo; Yikai Su; Songlin Zhuang; Yue Hao; Akihiko Yoshikawa; Chongjin Xie; Yoshiaki Nakano, Editor(s)

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