Abstract
It is found experimentally that the dependence of the spectral profile of four-photon mixing on the fiber length changes with the pump wavelength around zero dispersion band. The rising edge of the Stokes spectrum shifts toward the pump frequency side and the spectrum broadens as the fiber becomes longer under shorter pump wavelength, while no changes except for the power level appear in the spectrum under longer pump wavelength. A physical interpretation of this phenomenon is given from a view point of the effect of the characteristic length and the fiber length on the gain spectrum.
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