Abstract
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 mm diameter. To investigate the cause of the observed
wavelength shift, and the dependence on fiber design, a number of theoretical
models have been applied to the problem. The results of modeling suggest that
bend-induced changes in mode structure may explain the observed differences
between fiber types, while wavefront distortion might be the cause of the
general shift to shorter FBG center wavelengths when the bend diameter decreases.
© 2012 IEEE
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