All macroscopic deviations of the fiber’s axis from a straight line, that will cause light to leak out of the fiber, causing signal attenuation.
Macrobends are bends that are large enough to be seen by the human eye. Macrobend loss refers to losses induced in bends around mandrels (or corners in installations), the bends necessary to fit fibers inside splice closures or patch panels. Bend-insensitive fibers are intended to reduce macrobending loss so cables could be run around corners better and fibers would not have as much loss when stuffed into small spaces.

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