Abstract
It is shown that the sinusoidal signal wave transforms into a cnoidal periodic wave in an optical fiber if the power signal propagates in the fiber core. In this case the signal wave period increases and the wave profile changes. The signal wave amplitude takes on the form of a kink for the power signal. This wave transformation is determined by nonlinear effects in the fiber core. The linear modes of the fiber transform into nonlinear modes under the influence of the cubic or higher nonlinear interaction of the electromagnetic and polarization wave. These changes can be described using the equation for a polariton wave with sinusoidal nonlinearity.
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