Femtosecond laser inscribed superstructure fibre gratings


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.

Additional Information: K. Kalli, C. Koutsides, E. Davies, M. Komodromos, D. J. Webb and L. Zhang, "Femtosecond laser inscribed superstructure fibre gratings", Proc. SPIE 7753, 775393 (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: femtosecond laser inscribed superstructure fiber gratings, fsSFG, silica optical fibre, single step process, low loss, polarisation independent, sampled gratings, optical fibres, point by point femtosecond laser inscription method, controlled modulated index change, suppression, symmetric superstructure spectra, grating reflection, Fourier design limit, Maxwell's equations, back reflection spectrum, bidirectional beam propagation method, BiBPM, ac index modulation, wavelength, peak strength, Applied Mathematics, Computer Science Applications, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Condensed Matter Physics
ISBN: 9780819482464
Last Modified: 23 Oct 2019 11:49
Date Deposited: 16 Jun 2011 09:58
Published Date: 2011
Authors: Kalli, Kyriacos
Koutsides, C.
Davies, Edward M.
Komodromos, Michael
Webb, David J.
Zhang, Lin


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