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Dynamics of ultrashort pulse propagation in a dual-core fiber are governed by a set of coupled nonlinear Schr\"odinger equations. We apply numerical and analytical techniques to study the nature of the inelastic interactions between identical soliton pulses propagating in close proximity on separate cores. We find that the soliton interactions can change from repulsive at small values of the coupling coefficient to attractive at large values. Representative experimental parameters are discussed.
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Doty et al. (1995) studied this question.
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