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### Optical Engineering • new

Application of the finite-element method and the eigenmode expansion method to investigate the periodic and spectral characteristic of discrete phase-shift fiber Bragg grating
Author(s): Yue-Jing He; Wei-Chih Hung; Cheng-Jyun Syu
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Paper Abstract

The finite-element method (FEM) and eigenmode expansion method (EEM) were adopted to analyze the guided modes and spectrum of phase-shift fiber Bragg grating at five phase-shift degrees (including zero, $1 / 4 π$ , $1 / 2 π$ , $3 / 4 π$ , and $π$ ). In previous studies on optical fiber grating, conventional coupled-mode theory was crucial. This theory contains abstruse knowledge about physics and complex computational processes, and thus is challenging for users. Therefore, a numerical simulation method was coupled with a simple and rigorous design procedure to help beginners and users to overcome difficulty in entering the field; in addition, graphical simulation results were presented. To reduce the difference between the simulated context and the actual context, a perfectly matched layer and perfectly reflecting boundary were added to the FEM and the EEM. When the FEM was used for grid cutting, the object meshing method and the boundary meshing method proposed in this study were used to effectively enhance computational accuracy and substantially reduce the time required for simulation. In summary, users can use the simulation results in this study to easily and rapidly design an optical fiber communication system and optical sensors with spectral characteristics.

Paper Details

Date Published: 6 December 2017
PDF: 11 pages
Opt. Eng. 56(12) 127102 doi: 10.1117/1.OE.56.12.127102
Published in: Optical Engineering Volume 56, Issue 12
Show Author Affiliations
Yue-Jing He, National Chin-Yi Univ. of Technology (Taiwan)
Wei-Chih Hung, National Chin-Yi Univ. of Technology (Taiwan)
Cheng-Jyun Syu, National Chin-Yi Univ. of Technology (Taiwan)