Application of Beam Propagation Method to Discontinuities of Weakly Guiding Structures

Masashi HOTTA  Masahiro GESHIRO  Shinnosuke SAWA  

IEICE TRANSACTIONS on Electronics   Vol.E76-C   No.8   pp.1333-1338
Publication Date: 1993/08/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Opto-Electronics
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.