The coherently coupled nonlinear Schrodinger (NLS) equation for laser propagating in birefringent fiber with parametric amplification and Raman scattering has been utilized. Considering higher-order dispersive, the gain spectra are studied under coaction of Raman scattering and parametric amplification when the pump wave polarization is oriented at 45?between the axes by quoting Lorentzian model of Raman gain spectra in high-birefringence fiber. The results show that the gain spectra are influenced by high-order dispersion under different input parameters (the input power, group velocity mismatch) in the anomalous(or normal) dispersion regime. The structure and intensity as well as width of gain spectra will change. The influence of high-order dispersion on the gain spectra cannot been neglected. The T-frequency pulses can been extracted when gain spectra are away from center frequency in high group-velocity mismatching zone.%根据参量放大和拉曼效应共同作用下的耦合波方程,在考虑高阶色散情况下,当输入泵浦波偏振方向同双折射轴成45°时,通过引入拉曼增益的洛伦兹模型,研究了高双折射光纤中,参量放大和拉曼效应共同作用下的增益谱随相关参量的变化关系.结果表明:高双折射光纤中,在不同色散区,不同的输入参量(输入功率、群速度失配等)条件下,参量放大和拉曼效应共同作用下的增益谱受到高阶色散的影响,增益谱的结构、强度和谱宽产生了变化,高阶色散对增益谱的影响不可忽略；可以利用增益谱在大群速度失配区域远离中心频率偏移的性质,提取T频率脉冲.
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