title: Next-to-leading-order corrections to capacity for a nondispersive nonlinear optical fiber channel in the intermediate power region.
abstract: We consider the optical fiber channel modeled by the nonlinear Schrödinger equation with zero dispersion and additive Gaussian noise. Using the Feynman path-integral approach for the model, we find corrections to conditional probability density function, output signal distribution, conditional and output signal entropies, and the channel capacity at large signal-to-noise ratio. We demonstrate that the correction to the channel capacity is positive for large signal power. Therefore, this correction increases the earlier calculated capacity for a nondispersive nonlinear optical fiber channel in the intermediate power region.
authors.affiliation: Novosibirsk State University, Novosibirsk 630090, Russia.
authors.forename: A A
authors.initials: AA
authors.lastname: Panarin
authors.affiliation: Novosibirsk State University, Novosibirsk 630090, Russia.|Budker Institute of Nuclear Physics of Siberian Branch, Russian Academy of Sciences, Novosibirsk 630090, Russia.
authors.forename: A V
authors.initials: AV
authors.lastname: Reznichenko
authors.affiliation: Novosibirsk State University, Novosibirsk 630090, Russia.|Budker Institute of Nuclear Physics of Siberian Branch, Russian Academy of Sciences, Novosibirsk 630090, Russia.
authors.forename: I S
authors.initials: IS
authors.lastname: Terekhov