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Paper Abstract and Keywords
Presentation 2026-01-23 15:00
Propagation Analysis of Optical Waveguides Using Scattering Operator with Padé Approximation Boundary Condition
Taiki Matsuzaki, Akito Iguchi (Muroran Inst. Tech.), Keita Morimoto (Univ. of Hyogo), Yasuhide Tsuji (Muroran Inst. Tech.) EST2025-101
Abstract (in Japanese) (See Japanese page) 
(in English) The finite element method (FEM), which is widely used for optical waveguide analysis, offers excellent flexibility for modeling arbitrary geometries. However, it generally entails high computational cost because the entire computational domain must be discretized directly.To address this issue, methods that divide the analysis domain into subregions, represent each region using a scattering matrix, and evaluate the overall characteristics by connecting these matrices have been proposed. Such approaches enable efficient analysis of periodic structures and optimization problems that require repeated evaluation of device characteristics.
In previous studies, open-boundary conditions have been modeled by introducing perfectly matched layers (PMLs) at the lateral boundaries. However, the inclusion of absorbing layers increases the number of unknowns, leading to larger matrix sizes and higher computational cost in the construction of scattering matrices. In this paper, we apply boundary conditions based on a Padé approximation, which has a relatively low computational cost, to represent open systems without using PMLs. This approach reduces the computational cost associated with the construction and connection of scattering matrices and enables efficient propagation analysis.
Keyword (in Japanese) (See Japanese page) 
(in English) Finite element method / Propagation operator method / Padé-based boundary conditions / Scattering operator / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 328, EST2025-101, pp. 104-108, Jan. 2026.
Paper # EST2025-101 
Date of Issue 2026-01-15 (EST) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF EST2025-101

Conference Information
Committee EST  
Conference Date 2026-01-22 - 2026-01-23 
Place (in Japanese) (See Japanese page) 
Place (in English) Nobumoto Ohama Memorial Hal 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Simulation techniques, etc. 
Paper Information
Registration To EST 
Conference Code 2026-01-EST 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Propagation Analysis of Optical Waveguides Using Scattering Operator with Padé Approximation Boundary Condition 
Sub Title (in English)  
Keyword(1) Finite element method  
Keyword(2) Propagation operator method  
Keyword(3) Padé-based boundary conditions  
Keyword(4) Scattering operator  
Keyword(5)  
Keyword(6)  
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1st Author's Name Taiki Matsuzaki  
1st Author's Affiliation Muroran Institute of Technology (Muroran Inst. Tech.)
2nd Author's Name Akito Iguchi  
2nd Author's Affiliation Muroran Institute of Technology (Muroran Inst. Tech.)
3rd Author's Name Keita Morimoto  
3rd Author's Affiliation University of Hyogo (Univ. of Hyogo)
4th Author's Name Yasuhide Tsuji  
4th Author's Affiliation Muroran Institute of Technology (Muroran Inst. Tech.)
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Speaker Author-1 
Date Time 2026-01-23 15:00:00 
Presentation Time 25 minutes 
Registration for EST 
Paper # EST2025-101 
Volume (vol) vol.125 
Number (no) no.328 
Page pp.104-108 
#Pages 5 
Date of Issue 2026-01-15 (EST) 

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