Abstract

Multiple-beam Fizeau fringes in transmission have been applied to the study of the nonlinear stress–strain relationship due to bending in the cladding of single-mode optical fibers. The present study yields a relation between the variation of refractive indices of bent single-mode fibers, represented by the fringe shift, and the nonlinear radial change of Young’s modulus along the fiber cross section. Experimentally, the study confirms the nonlinear asymmetric stress–strain relation across the fiber cross section. This relation is due to the asymmetric distribution of the compression and tensile stresses over the fiber cross section rather than to the shift in the centroid (neutral axis).

© 2001 Optical Society of America

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