Point-by-point written fiber-Bragg gratings and their application in complex grating designs

Graham D. Marshall, Robert J. Williams, Nemanja Jovanovic, M. J. Steel, Michael J. Withford

Research output: Contribution to journalArticlepeer-review

161 Citations (Scopus)


The point-by-point technique of fabricating fibre-Bragg gratings using an ultrafast laser enables complete control of the position of each index modification that comprises the grating. By tailoring the local phase, amplitude and spacing of the grating's refractive index modulations it is possible to create gratings with complex transmission and reflection spectra. We report a series of grating structures that were realized by exploiting these flexibilities. Such structures include gratings with controlled bandwidth, and amplitude- and phase-modulated sampled (or superstructured) gratings. A model based on coupled-mode theory provides important insights into the manufacture of such gratings. Our approach offers a quick and easy method of producing complex, non-uniform grating structures in both fibres and other mono-mode waveguiding structures.

Original languageEnglish
Pages (from-to)19844-19859
Number of pages16
JournalOptics Express
Issue number19
Publication statusPublished - 13 Sep 2010


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