Abstract
Multiple-beam Fizeau fringes crossing bent single-mode optical
fibers immersed in matching liquid reveal the existence of induced
birefringence. Changes in the fiber cladding refractive index
δn were measured from the fringe shift to an accuracy of
±1 × 10-4. Mathematical expressions were
deduced to evaluate Poisson’s ratio and to describe the radial strain
distribution profiles of bent optical fibers from the experimental
values of the fringe shifts. Experimental results were obtained
from microinterferograms. Studying bent fibers by application of
Fizeau fringes interferometry provides a nondestructive, accurate,
sensitive, and reliable method to measure their parameters and
characteristics.
© 2000 Optical Society of America
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