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Proceedings Paper

Ninety-deg. bends in low-index contrast waveguides
Author(s): Lixia Li; Gregory P. Nordin; Jennifer M. English; Jianhua Jiang
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Paper Abstract

We discuss the use of multiple layer air trench and silicon strip structures to realize high efficiency 90° bends for low index contrast waveguides. We use a micro-genetic algorithm (mGA) coupled with a 2-D finite difference time domain method to perform rigorous electromagnetic optimization of multi-layer structures for single mode waveguides. We find that a 3-layer air trench structure can be designed for a 90° waveguide bend that exhibits 97.2% efficiency for TM polarized light at a wavelength of 1.55 μm. We are also able to design five- and six-layer silicon strip bends that have high efficiency for both TE and TM polarizations. For example, simulation results for a six-layer design show 95.2% and 97.2% for TE and TM polarizations, respectively. Moreover, the bend efficiency for each polarization state is greater than 90% over a broad wavelength range (1.5 μm to 1.7 μm).

Paper Details

Date Published: 19 June 2003
PDF: 8 pages
Proc. SPIE 4987, Integrated Optics: Devices, Materials, and Technologies VII, (19 June 2003); doi: 10.1117/12.474365
Show Author Affiliations
Lixia Li, Univ. of Alabama in Huntsville (United States)
Gregory P. Nordin, Univ. of Alabama in Huntsville (United States)
Jennifer M. English, Univ. of Alabama in Huntsville (United States)
Jianhua Jiang, Univ. of Alabama in Huntsville (United States)


Published in SPIE Proceedings Vol. 4987:
Integrated Optics: Devices, Materials, and Technologies VII
Yakov S. Sidorin; Ari Tervonen, Editor(s)

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