Conference paper

Formation and spectral characterisation of Bragg gratings in standard single-mode optical fibers

Permanent Bragg gratings in monomode optical fibers are obtained by irradiation through an interference pattern of an ultraviolet laser. The main parameters of such gratings, in particular the index modulation amplitude and their length, are precisely determined by a fine adjustment between the measured reflectivity and a theoretical curve. Gratings have been formed in a standard monomode telecommunication fiber, with reflectivities above 90% and with bandwidths on the order of 1 to 3 nm. Their reflectivity spectra are symmetric and comparable with theoretical curves. Index modulations up to 1.2 10-3 have been determined, which is more than one order of magnitude greater than earlier reported. A precise knowledge of the maximal index change allows one to know the formation possibilities of gratings with regard to reflectivity and bandwidth

    Keywords: [OFD] ; diffraction gratings ; light interference ; optical fibres ; reflectivity


    Ecole Polytech. Federale Lausanne, Switzerland


    spectral characterisation

    Bragg gratings

    single-mode optical fibers

    monomode optical fibers

    interference pattern

    index modulation amplitude



    maximal index change


    • LOA-CONF-1993-001

    Record created on 2009-01-20, modified on 2016-08-08


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