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Title: Characterizing femtosecond laser inscribed bragg grating spectra
Authors: Kalli, Kyriacos 
Webb, David J. 
Zhang, Lin 
Koutsides, Charalambos 
Keywords: Fiber optics;Finite element method;Fibers
Category: Electrical Engineering - Electronic Engineering - Information Engineering
Field: Engineering and Technology
Issue Date: 3-Jan-2011
Publisher: Osa
Source: Optics Express, 2011, vol. 19, no. 1, pp. 342-352
Journal: Optics Express 
Abstract: We present numerical modeling based on a combination of the Bidirectional Beam Propagation Method and Finite Element Method that completely describes the wavelength spectra of point by point femtosecond laser inscribed fiber Bragg gratings, showing excellent agreement with experiment. We have investigated the dependence of different spectral parameters such as insertion loss, all dominant cladding and ghost modes and their shape relative to the position of the fiber Bragg grating in the core of the fiber. Our model is validated by comparing model predictions with experimental data and allows for predictive modeling of the gratings. We expand our analysis to more complicated structures, where we introduce symmetry breaking; this highlights the importance of centered gratings and how maintaining symmetry contributes to the overall spectral quality of the inscribed Bragg gratings. Finally, the numerical modeling is applied to superstructure gratings and a comparison with experimental results reveals a capability for dealing with complex grating structures that can be designed with particular wavelength characteristics
ISSN: 1094-4087
DOI: 10.1364/OE.19.000342
Rights: © Optical Society of America.
Type: Article
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