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In this example, we investigate the soliton self-frequency shift arising from stimulated Raman scattering in a fiber. The Raman gain, getting stronger towards longer wavelength, amplifies the longer-wavelength components within the pulse spectrum at the expense of power in the shorter-wavelength parts. In effect, the pulse spectrum more and more drifts towards longer wavelengths. Also, there is a slight decrease of pulse energy and an increase of the pulse duration. It has been assumed that there is no higher-order dispersion.
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