Abstract
Original results and the most interesting aspects of nonlinear spectroscopy in silica optical fibers (OF) are reviewed. The threshold nature of stimulated Raman scattering (SRS) and the shape and intensity of SRS lines was determined. The observed SRS spectra in OF consisted of a number of narrow lines due to silica network vibrations, to dopant and microdefect, and more than 20 overtones and combination vibrations. The anharmonicity constants and the frequencies of harmonic vibrations were calculated for the first time. It was shown that the minimal anharmonicity was characteristic for deformation vibrations of silica tetrahedrons. It was emphasized that the SRS possessed the simple and universal character for express- analytical investigations of type, concentrations, and spatial distributions of dopant and microdefect in any transparent glass media which could be manufactured as OF with optical losses no greater than 100 dB/km.
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