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This paper presents a novel perturbation method for the nonlinear Schr?dinger equation (NLSE) that governs the propagation of light in optical fibers. Authors apply this method to study signal-noise interactions in amplified multispan fiber-optic systems. Being based on a combination of the Regular Perturbation (RP) and logarithmic perturbation, the method is especially suitable for modeling the simultaneous presence of nonlinear and dispersive effects. Even after linearization, it retains the contribution of the quadratic perturbation terms of the NLSE, thereby achieving higher accuracy than an RP with comparable complexity.
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