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.

© 1994 Optical Society of America

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