Abstract
Two new bending loss theories for leaky modes in optical fibers with arbitrary refractive-index profiles are presented. The numerical results are compared with the two known theories of Marcuse and Shah and of Vassalo. The two new theories are valid in a larger region of bend radii than the Marcuse-Shah theory. For the first time, to the author's knowledge, it is shown that for even and odd modes the bending loss is different, in general.
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