The Gain Characteristic Of Raman Scattering And Parametric Amplification In Birefringence Fiber

The nonlinear coupled-mode equation of the propagation of a light pulse in the birefringent fiber has been utilized, at same time quoting Lorentzian model of parallel raman gain spectra.The Gain Characteristic have been studied in birefringence fiber and Photonic crystal fiber (PCF) combine with raman scattering and parametric amplification, when the pump wave polarization is oriented at 45°between the birefringent fiber axes. The gain spectra have been discussed as function of the input parameters (input power, the group velocity mismatch) in different dispersion regimes. The result shows that the input parameters has a great influence on the gain spectrums of birefringence fiber and PCF,because of the interaction between parametric amplification and raman scattering. The gain spectrum bandwidth widened and the intensity enhanced as the input power and the group-velocity mismatch enlarged. In birefringence fiber, the gain spectra bandwidth widened and the intensity enhanced as the input power enlarged,and it is complicated in structure with the group-velocity mismatch. The gain appears as primarily anti-stokes in anomalous dispersion regime,and stokes in normal dispersion regime. In PCF, Stokes is multiple-peaked structure when input bigger power and achieve stability in anomalous dispersion regime.The stokes waves gain are larger than anti-stokes waves gain in normal dispersion regime. The pump wave can be changed into pulse array under certain conditions so that we can extract T-frequency pluses from it.