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Proceedings Paper

Efficiency analysis of parallelized wavelet-based FDTD model for simulating high-index optical devices
Author(s): Rong Ren; Jin Wang; Xiyan Jiang; Yunqing Lu; Ji Xu
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Paper Abstract

The finite-difference time-domain (FDTD) method, which solves time-dependent Maxwell’s curl equations numerically, has been proved to be a highly efficient technique for numerous applications in electromagnetic. Despite the simplicity of the FDTD method, this technique suffers from serious limitations in case that substantial computer resource is required to solve electromagnetic problems with medium or large computational dimensions, for example in high-index optical devices. In our work, an efficient wavelet-based FDTD model has been implemented and extended in a parallel computation environment, to analyze high-index optical devices. This model is based on Daubechies compactly supported orthogonal wavelets and Deslauriers-Dubuc interpolating functions as biorthogonal wavelet bases, and thus is a very efficient algorithm to solve differential equations numerically. This wavelet-based FDTD model is a high-spatial-order FDTD indeed. Because of the highly linear numerical dispersion properties of this high-spatial-order FDTD, the required discretization can be coarser than that required in the standard FDTD method. In our work, this wavelet-based FDTD model achieved significant reduction in the number of cells, i.e. used memory. Also, as different segments of the optical device can be computed simultaneously, there was a significant gain in computation time. Substantially, we achieved speed-up factors higher than 30 in comparisons to using a single processor. Furthermore, the efficiency of the parallelized computation such as the influence of the discretization and the load sharing between different processors were analyzed. As a conclusion, this parallel-computing model is promising to analyze more complicated optical devices with large dimensions.

Paper Details

Date Published: 24 October 2014
PDF: 8 pages
Proc. SPIE 9270, Optoelectronic Devices and Integration V, 92701G (24 October 2014); doi: 10.1117/12.2071497
Show Author Affiliations
Rong Ren, Nanjing Univ. of Posts and Telecommunications (China)
Jin Wang, Nanjing Univ. of Posts and Telecommunications (China)
Xiyan Jiang, Nanjing Univ. of Posts and Telecommunications (China)
Yunqing Lu, Nanjing Univ. of Posts and Telecommunications (China)
Ji Xu, Nanjing Univ. of Posts and Telecommunications (China)

Published in SPIE Proceedings Vol. 9270:
Optoelectronic Devices and Integration V
Xuping Zhang; Hai Ming; Changyuan Yu, Editor(s)

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