Finite element beam propagation method for three-dimensional optical waveguide structures

Author

Tsuji, Yasuhide ; Koshiba, Masanori ; Shiraishi, Tatsuki

Author_Institution

Dept. of Appl. Electron., Hokkaido Inst. of Technol., Sapporo, Japan

Volume

15

Issue

9

fYear

1997

fDate

9/1/1997 12:00:00 AM

Firstpage

1728

Lastpage

1734

Abstract

A beam propagation method (BPM) based on the finite element method (FEM) is described for longitudinally varying three-dimensional (3-D) optical waveguides. In order to avoid nonphysical reflections from the computational window edges, the transparent boundary condition is introduced. The present algorithm using the Pade approximation is, to our knowledge, the first wide-angle finite element beam propagation method for 3-D waveguide structures. To show the validity and usefulness of this approach, numerical results are shown for Gaussian-beam excitation of a straight rib waveguide and guided-mode propagation in a Y-branching rib waveguide

Keywords

finite element analysis; optical waveguide theory; rib waveguides; Gaussian-beam excitation; Pade approximation; Y-branching rib waveguide; computational window edges; finite element beam propagation method; guided-mode propagation; longitudinally varying 3-D optical waveguides; nonphysical reflections; numerical results; straight rib waveguide; three-dimensional optical waveguide structures; transparent boundary condition; wide-angle method; Approximation algorithms; Boundary conditions; Equations; Finite element methods; Nonlinear optics; Optical propagation; Optical reflection; Optical refraction; Optical variables control; Optical waveguides;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.622901

Filename

622901