Superstructure fiber gratings via single step femtosecond laser inscription

C. Koutsides, Edward Davies, Kyriacos Kalli, M. Komodromos, Thomas D.P. Allsop, David J. Webb, Lin Zhang

Research output: Contribution to journalArticle

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.
Original languageEnglish
Article number6075225
Pages (from-to)1229-1236
Number of pages8
JournalJournal of Lightwave Technology
Volume30
Issue number8
DOIs
Publication statusPublished - 15 Apr 2012

Fingerprint

gratings
fibers
lasers
Maxwell equation
coupled modes
numerical analysis
optical fibers
retarding
refractivity
silicon dioxide
modulation
propagation
polarization
wavelengths
temperature

Keywords

  • fiber gratings
  • optical fiber sensors
  • numerical modeling
  • femtosecond lasers

Cite this

Koutsides, C. ; Davies, Edward ; Kalli, Kyriacos ; Komodromos, M. ; Allsop, Thomas D.P. ; Webb, David J. ; Zhang, Lin. / Superstructure fiber gratings via single step femtosecond laser inscription. In: Journal of Lightwave Technology. 2012 ; Vol. 30, No. 8. pp. 1229-1236.
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Koutsides, C, Davies, E, Kalli, K, Komodromos, M, Allsop, TDP, Webb, DJ & Zhang, L 2012, 'Superstructure fiber gratings via single step femtosecond laser inscription', Journal of Lightwave Technology, vol. 30, no. 8, 6075225, pp. 1229-1236. https://doi.org/10.1109/JLT.2011.2175702

Superstructure fiber gratings via single step femtosecond laser inscription. / Koutsides, C.; Davies, Edward; Kalli, Kyriacos; Komodromos, M.; Allsop, Thomas D.P.; Webb, David J.; Zhang, Lin.

In: Journal of Lightwave Technology, Vol. 30, No. 8, 6075225, 15.04.2012, p. 1229-1236.

Research output: Contribution to journalArticle

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AU - Zhang, Lin

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Koutsides C, Davies E, Kalli K, Komodromos M, Allsop TDP, Webb DJ et al. Superstructure fiber gratings via single step femtosecond laser inscription. Journal of Lightwave Technology. 2012 Apr 15;30(8):1229-1236. 6075225. https://doi.org/10.1109/JLT.2011.2175702