Abstract

We examine the nonlinear interaction between the linearly polarized modes on a few-mode elliptical-core optical fiber. Three modes are involved in this process: the fundamental (LP₀₁) mode and the two second-order symmetry modes, LP₁₁ (even) and LP₁₁ (odd), which have slightly different propagation constants. In practical situations the large δβ = β₀₁ − β₁₁(β is the propagation constant) precludes any significant coupling between the fundamental and either of the LP₁₁ modes; however, coupling between the two LP₁₁ symmetry modes may occur for sufficient pump intensities. Exact and approximate analytic expressions are given.

© 1992 Optical Society of America

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