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The effect of macrobending on fiber Bragg gratings (FBGs) in standard and specialist use single-mode fibers has been investigated for bend diameters down to 6 mm. The bend dependence of various spectral properties of FBGs, including center wavelength, were found to depend upon fiber type. A maximum centre wavelength shift of 0.39 nm was measured for a FBG written in low bend loss fiber bent to a 6...