A detailed procedure is presented to compute analytically the acoustooptic coupling coefficient between copropagating core and\nlowest-order cladding modes in tapered fiber optics. Based on the effect of the local bending, the linear and nonlinear variations in\nthe refractive index aremodeled. A set of equations and parameters are presented in order to calculate the influence of acoustooptic\neffect in nonlinear pulse propagation.We will show that as the tapered fiber diameter decreases more energy can be transferred to\nthe cladding and the nonlinear phenomena can compensate the coupling coefficients effects.
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