Numerical modelling of complex femtosecond laser inscribed fiber gratings - comparison wih experiment


We present experimental studies and numerical modeling based on a combination of the Bidirectional Beam Propagation Method and Finite Element Modeling 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.

Additional Information: C. Koutsides, K. Kalli, D. J. Webb and L. Zhang, "Numerical modeling of complex femtosecond laser inscribed fiber gratings: comparison with experiment", Proc. SPIE 7753, 77536Q (2011). 21st International Conference on Optical Fiber Sensors (OFS21), 15-19 May 2011, Ottawa (CA). Copyright 2011 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Uncontrolled Keywords: Bidirectional Beam Propagation Method, Finite Element Modeling, wavelength spectra of point by point femtosecond laser inscribed fiber Bragg gratings, insertion loss, dominant cladding, ghost modes, shape, fiber Bragg grating, symmetry breaking, Computer Science Applications, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Applied Mathematics, Condensed Matter Physics
ISBN: 10111712885110
Last Modified: 23 Oct 2019 11:49
Date Deposited: 16 Jun 2011 10:10
Published Date: 2011
Authors: Koutsides, C.
Kalli, Kyriacos
Webb, David J.
Zhang, Lin


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