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Sensors 2016, 16(2), 192; doi:10.3390/s16020192

Using Finite Element and Eigenmode Expansion Methods to Investigate the Periodic and Spectral Characteristic of Superstructure Fiber Bragg Gratings

Department of Electronic Engineering, National Chin-Yi University of Technology, No.57, Section 2, Zhongshan Road, Taiping District, Taichung 41170, Taiwan
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Author to whom correspondence should be addressed.
Academic Editors: Hsiung-Cheng Lin and Wen-Yuan Chen
Received: 6 January 2016 / Revised: 27 January 2016 / Accepted: 2 February 2016 / Published: 4 February 2016
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Abstract

In this study, a numerical simulation method was employed to investigate and analyze superstructure fiber Bragg gratings (SFBGs) with five duty cycles (50%, 33.33%, 14.28%, 12.5%, and 10%). This study focuses on demonstrating the relevance between design period and spectral characteristics of SFBGs (in the form of graphics) for SFBGs of all duty cycles. Compared with complicated and hard-to-learn conventional coupled-mode theory, the result of the present study may assist beginner and expert designers in understanding the basic application aspects, optical characteristics, and design techniques of SFBGs, thereby indirectly lowering the physical concepts and mathematical skills required for entering the design field. To effectively improve the accuracy of overall computational performance and numerical calculations and to shorten the gap between simulation results and actual production, this study integrated a perfectly matched layer (PML), perfectly reflecting boundary (PRB), object meshing method (OMM), and boundary meshing method (BMM) into the finite element method (FEM) and eigenmode expansion method (EEM). The integrated method enables designers to easily and flexibly design optical fiber communication systems that conform to the specific spectral characteristic by using the simulation data in this paper, which includes bandwidth, number of channels, and band gap size. View Full-Text
Keywords: superstructure fiber bragg grating; finite element method; eigenmode expansion method; perfectly matched layer; perfectly reflecting boundary; object meshing method; boundary meshing method superstructure fiber bragg grating; finite element method; eigenmode expansion method; perfectly matched layer; perfectly reflecting boundary; object meshing method; boundary meshing method
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

He, Y.-J.; Hung, W.-C.; Lai, Z.-P. Using Finite Element and Eigenmode Expansion Methods to Investigate the Periodic and Spectral Characteristic of Superstructure Fiber Bragg Gratings. Sensors 2016, 16, 192.

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