Abstract

A set of coupled-mode equations is derived to describe mode propagation in uniform and slightly non-uniform cylindrical optical-fiber systems. The coupling between fibers of an array made up of <i>n</i> identical fibers each at the vertex of a polygon and one at the center, which is not necessarily the same as its <i>n</i> neighbors, is determined. Examples of this array are two fibers, three fibers in a row, and a hexagonal array with a fiber in the center. Very simple expressions for the coupling coefficients are presented. Mode coupling on a lossy fiber is investigated and a simple expression for the loss of a HE<sub>11</sub> mode is given.

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