Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.14279/4308
Title: Superstructure Fiber Gratings via Single Step Femtosecond Laser Inscription
Authors: Kalli, Kyriacos 
Davies, Edward M. 
Komodromos, Michael 
Allsop, Thomas P. 
Webb, David 
Zhang, Lin 
Koutsides, Charalambos 
Major Field of Science: Engineering and Technology
Field Category: Electrical Engineering - Electronic Engineering - Information Engineering
Keywords: Femtosecond lasers;Numerical analysis;Maxwell equations;Optical fibers;Silica
Issue Date: 15-Apr-2012
Source: Journal of Lightwave Technology, 2012, vol. 30, no. 8, pp. 1229-1236
Volume: 30
Issue: 8
Start page: 1229
End page: 1236
Journal: Journal of Lightwave Technology 
Abstract: We present the development of superstructure fiber gratings (SFG) in Ge-doped, silica optical fiber using femtosecond laser inscription. We apply a simple but extremely effective single step process to inscribe low loss, sampled gratings with minor polarization dependence. The method results in a controlled modulated index change with complete suppression of mode coupling associated with the overlapping LPG structure leading to highly symmetric superstructure spectra, with the grating reflection well within the Fourier design limit. The devices are characterized and compared with numerical modeling by solving Maxwell's equations and calculating the back reflection spectrum using the bidirectional beam propagation method (BiBPM). Experimental results validate our numerical analysis, allowing for the estimation of inscription parameters such as the ac index modulation change, and the wavelength, position and relative strength of each significant resonance peak. We also present results on temperature and refractive index measurements showing potential for sensing applications.
URI: https://hdl.handle.net/20.500.14279/4308
ISSN: 15582213
DOI: 10.1109/JLT.2011.2175702
Rights: © 2011 IEEE.
Type: Article
Affiliation : Cyprus University of Technology 
Imperial College London 
Frederick University 
Aston University 
Publication Type: Peer Reviewed
Appears in Collections:Άρθρα/Articles

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