Abstract
A new approach to the physical description and quantification of bend loss in arbitrarily bent single-mode
fibers is based on the coupling of the fundamental mode to cladding modes solely due to curvature change along the
fiber. Using a slab model, it is shown that there is an optimum bend design criterion based on the rate of change of
curvature that can reduce bend loss to almost arbitrarily low levels regardless of curvature, provided only that the
fiber coating index value is sufficiently smaller than that of the cladding index. With a finite coating, the
propagation of the field around the bend is influenced by both the refractive index of the coating and its bulk
absorption.
© 2007 IEEE
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