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Reformulation of FFT-BPM for highly accurate analysis

✍ Scribed by Masayuki Yamamoto; Yasuhide Tsuji; Masanori Koshiba

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
232 KB
Volume
81
Category
Article
ISSN
8756-663X

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✦ Synopsis

The formulation of FFT-BPM to be effective in the analysis and design of optical waveguide devices is revised. A new method is conceived that can prevent degradation of numerical accuracy by keeping the phase rotation term small regardless of the value of the reference refractive index. By using two-and three-dimensional tilted straight waveguides, the performance of the FFT-BPM developed here is evaluated. It is confirmed that the accuracy of the paraxial equation, whose use in the analysis of a wide-angle beam propagation is considered difficult, has been increased substantially. Also, the Padé approximation is applied for the first time to three-dimensional FFT-BPM. In addition, we point out that the method proposed here is effective for Padé approximation.

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