Transfer-matrix method for the analysis of two parallel dissimilar nonuniform long-period fiber gratings

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Original languageEnglish
Pages (from-to)1008-1018
Journal / PublicationJournal of Lightwave Technology
Issue number2
Publication statusPublished - Feb 2006


A transfer-matrix method based on the coupled-mode theory is developed for the analysis of an all-fiber coupler consisting of two parallel long-period fiber gratings (LPFGs), which can be dissimilar and nonuniform. Using this method, the effects of various forms of nonuniformity introduced along the gratings on the transmission characteristics of the coupler are studied. The nonuniformities considered include pitch detuning, chirping, phase shifts, and index apodization. Numerical examples are given to highlight the conditions of achieving high coupling efficiency and the possibility of suppressing ripples and side lobes in the transmission spectrum. The obtained results are useful for the understanding and the design of various kinds of long-period grating-based devices, such as filters, broadband couplers, signal taps, and add/drop multiplexers. © 2006 IEEE.

Research Area(s)

  • Coupled-mode theory, Fiber gratings, Long-period fiber gratings (LPFGs), Optical couplers, Optical fiber devices, Optical filters, Transfer-matrix method