We demonstrate that in stationary, spatially homogeneous nonlinear media, interconversion of different-type solitary waves can occur as a result of spectral inhomogeneity of the medium parameters. As compared with the classical mode conversion in propagation through a spatially nonuniform medium, this interconversion effect is accompanied by a drift of the wave spectra in the frequency domain and their subsequent conversion by reflection at spectral turning points. By analyzing the Schrödinger and dissipative optical solitons, we show that such interconversion may result in the periodic self-oscillations of soliton spectra in nonlinear media with a frequency-dependent gain.
© 1998 Optical Society of America
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