Femtosecond laser inscribed superstructure fibre gratings

K. Kalli, C. Koutsides, E. Davies, Michael Komodromos, David J. Webb, Lin Zhang

    Research output: Chapter in Book/Published conference outputConference publication

    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.
    Original languageEnglish
    Title of host publication21st International Conference on Optical Fiber Sensors
    EditorsWojtek J. Bock, Jacques Albert, Xiaoyi Bao
    Place of PublicationBellingham, WA (US)
    PublisherSPIE
    Number of pages4
    ISBN (Print)978-0-8194-8246-4
    DOIs
    Publication statusPublished - 17 May 2011
    Event21st International Conference on Optical Fiber Sensors - Ottawa, ON, Canada
    Duration: 15 May 201119 May 2011
    http://www.ofs21.org/

    Publication series

    NameSPIE Proceedings
    PublisherSPIE
    Volume7753
    ISSN (Print)0277-786X
    ISSN (Electronic)2410-9045

    Conference

    Conference21st International Conference on Optical Fiber Sensors
    Abbreviated titleOFS21
    Country/TerritoryCanada
    CityOttawa, ON
    Period15/05/1119/05/11
    Internet address

    Bibliographical note

    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.

    DOI: http://dx.doi.org/10.1117/12.885994

    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

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