根据激光脉冲在双折射光纤中传输时,拉曼效应和参量放大共同作用下所所遵循的耦合模方程,基于平行拉曼增益的洛伦兹模型,给出了输入抽运波偏振方向沿相互正交的双折射轴时,拉曼效应和参量放大共同作用所导致的增益.讨论并分析了在不同色散区相关参量对增益谱特性的影响.结果表明,拉曼效应改变了非线性和色散的相互平衡,使得参量放大斯托克斯波与反斯托克斯波增益谱彼此不对称;当输入功率一定时,其增益谱结构确定,非线性系数和色散系数两者之间相对变化时,增益谱的强度和展宽有所改变. According to the Lorentz model with parallel Raman gain, the coupled mode equations followed by Raman effect and parametric amplification are given along the direction of polarization of the input pump wave when the laser pulse propagates through the birefringent fiber. Orthogonal birefringence axis, the Raman effect and the parametric amplification.The results show that the Raman effect changes the nonlinearity and dispersion So that the parametric amplification Stokes wave and anti-Stokes wave gain spectrum are asymmetric to each other; when the input power is constant, the structure of the gain spectrum is determined, and when both the nonlinear coefficient and the dispersion coefficient change relatively, the gain Spectral intensity and broadening change.