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Application of Beam Propagation Method to Discontinuities of Weakly Guiding Structures
Masashi HOTTA Masahiro GESHIRO Shinnosuke SAWA
IEICE TRANSACTIONS on Electronics
Publication Date: 1993/08/25
Print ISSN: 0916-8516
Type of Manuscript: PAPER
beam propagation method, reflected wave, waveguide discontinuity, overlap integral,
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The beam propagation method (BPM) is a powerful and manageable method for the analysis of wave propagation along weakly guiding optical waveguides. However, the effects of reflected waves are not considered in the original BPM. In this paper, we propose two simple modifications of the BPM to make it relevant in characterizing waveguide discontinuities at which a significant amount of reflection is expected to be observed. Validity of the present modifications is confirmed by the numerical results for the slab waveguide discontinuities and the butt-joints between different slab waveguides which either support the dominant mode or higher order modes.