Phase retrieval from transmission spectrum for long-period fiber gratings

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Original languageEnglish
Article number6518149
Pages (from-to)2223-2229
Journal / PublicationJournal of Lightwave Technology
Issue number13
Publication statusPublished - 2013


We demonstrate a method to retrieve the phase spectrum of a long-period fiber grating (LPFG) from its transmission spectrum. The method is based on the Hilbert transform that relates the minimum phase and the amplitude spectrum of a linear system, and is applicable to under-coupled LPFGs with arbitrary grating profiles. We verify the method with numerical examples and experiments. The method provides a simple and effective way to obtain the phase characteristics of LPFGs and thus complement the measured transmission spectra of the gratings. © 1983-2012 IEEE.

Research Area(s)

  • Gratings, long-period fiber gratings, optical filters