Abstract
A bending loss formula for optical fibers with an axially symmetric arbitrary-index profile is derived by approximating the refractive-index profile with a staircase function. The permissible bending radius R* defined for a given value of bending loss is derived. It is deduced that R* is nearly proportional to wavelength λ when the normalized frequency υ and the refractive-index difference Δ are fixed. The ratio of R* at two different values of υ depends only on the ratio of υ. The influence of an index dip and profile smoothing on R* is numerically evaluated.
© 1978 Optical Society of America
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