Abstract
In this paper, the intrinsic diameter of the noncircular cross section of an unclad optical fiber is defined and determines the fiber dimension. Its value can be determined by studying the forwardscattering pattern from the fiber illuminated by a laser beam perpendicular to its axis. A knowledge of the shape of the fiber is not necessary. The suggested method is nondestructive. Moreover, it provides an estimate of the deformation of the fiber cross section.
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