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Dynamics of frequency-modulated wave packets in optical guides with complex-valued material parametersa Ul'yanovsk State University, ul. L. Tolstogo 42, Ulyanovsk, 432700, Russian Federation b Scientific-Research Institute of Atomic Reactors, Dimitrovgrad, Ul'yanovsk Region, Russian Federation Features of wave packet dynamics in linear and nonlinear optical fibers are studied allowing for complex-valued dispersion parameters. It is shown that the presence of imaginary components in dispersion parameters affects considerably the compression behavior of a wave packet in single-element and cascaded optical fibers; causes a shift in carrier frequency; and creates frequency-modulated wave packets with a superluminal envelope maximum.
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