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In this study long-period-fibre gratings (LPFGs) were prepared experimentally using a carbon dioxide (CO 2) laser pulse and SMF. The point by point (pbp) technique was used with
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Understanding these gratings begins with a solid grasp of optical fiber properties and the functionality of the gratings themselves. This article offers a detailed exploration of both fundamental principles and
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The transmission of a mode guided by the core of an optical fiber through an ultraviolet-induced fiber grating when substantial coupling to cladding modes occurs is analyzed both experimentally and
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Examples are given to illustrate the wide variety of optical properties that are possible in fiber gratings. The types of gratings considered include uniform, apodized, chirped, discrete phase-shifted, and
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Long-period fiber gratings are particularly interesting for multi-parameter sensing (e.g. of temperature and strain), and alternatively for strain sensing with very low sensitivity to temperature changes.
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In this paper, we briefly introduce the principle of optical coupling, theoretical analysis, fabrication techniques, and applications of the FMF-LPFGs in optical communications and optical...
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Based on the coupled-mode theory, the coupling mechanism of cascaded long-and short-period gratings (CLBGs) is analyzed, and the reflection spectrum with two reflection peaks resulting
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This review synthesizes and categorizes a class of novel long-period fiber gratings (LPFGs) engineered through the modification of the external cladding morphology or geometry.
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In this chapter we will make a review of the relevant aspects of LPFGs.
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Various gratings with complex structures have been designed: gratings combining several LPFGs, LPFGs with superstructures, chirped gratings, and gratings with apodization.
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