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Dispersive wave generation in microstructured fiber with periodically modulated diameter

The application of microstructured fiber with periodically modulated diameter for a flat supercontinuum generation is proposed. We report the results of numerical study of spectral broadening of low-order femtosecond solitons. It is shown that periodical modulation of phase-matching conditions leads to spectrum broadening and disappearing of spectral gap between spectra of soliton and dispersive wave. The shape of output spectrum depends on period of the modulation of diameter of microstructured fiber.