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Title: Femtosecond laser inscribed superstructure fibre gratings
Authors: Kalli, Kyriacos 
Davies, Edward M. 
Komodromos, Michael 
Webb, David J. 
Zhang, Lin 
Koutsides, Charalambos 
Keywords: Femtosecond lasers;Silica;Optical fibers;Fiber optics
Category: Electrical Engineering - Electronic Engineering - Information Engineering
Field: Engineering and Technology
Issue Date: 15-May-2011
Publisher: Spie Digital Library
Source: (2011) Proceedings of SPIE - The International Society for Optical Engineering, 7753, art. no. 775393; 21st International Conference on Optical Fiber Sensors;ON;15 -19 May 2011,Ottawa
Journal: Proceedings of SPIE - The International Society for Optical Engineering 
Conference: International Conference on Optical Fiber Sensors 
Abstract: We demonstrate the development of femtosecond laser inscribed superstructure fiber gratings (fsSFG) in silica optical fibre. We utilise a single step process, to inscribe low loss and polarisation independent, sampled gratings in optical fibres using the point by point femtosecond laser inscription method. Our approach results in a controlled modulated index change with complete suppression of any overlapping LPG structure leading to highly symmetric superstructure spectra, with the grating reflection well within the Fourier design limit. We also solve Maxwell's equations and calculate the back reflection spectrum using the bidirectional beam propagation method (BiBPM). Experimental results validate our numerical analysis and the estimation of inscription parameters such as ac index modulation, wavelength and the relative peak strength. We also explore how changes in the grating's period influence the reflection spectrum.
ISBN: 978-081948246-4
ISSN: 0277-786X
DOI: 10.1117/12.885994
Rights: © 2011 SPIE
Type: Conference Papers
Appears in Collections:Δημοσιεύσεις σε συνέδρια/Conference papers

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