单模双折射光纤中的增益

在双折射光纤中，根据受激拉曼散射和参量放大共同作用下的斯托克斯波和反斯托克斯波所满足的耦合模方程，考虑输入泵浦波是线偏振光，推导出了与泵浦波偏振方向垂直的的斯托克斯波和反斯托克斯波的增益系数；研究了双折射色散缓变光纤中，斯托克斯波和反斯托克斯波增益随相关参量的变化关系。结果表明，与泵浦波偏振方向垂直的斯托克斯波和反斯托克斯波增益的变化趋势是完全相同和对称的；同时表明，通过改变失配系数 ，在适当的传输位置,可以实现对斯托克斯波和反斯托克斯波有选择性的输出，以达到输出频率转换的目的。

Gain of single-mode birefringence fiber

According to the coupled mode equations of the Stokes and anti-stokes when acted by stimulated Raman scattering and parametric amplification simultaneously in birefringence fiber, the pump wave is linearly polarized and aligned with the x-axis . The gains have been derived out about the Stokes and anti-stokes in the y polarization .The gain spectra have been discussed as function of correlation parameters in birefringence dispersion-decreasing fiber. The result shows that gain spectra are absolutely symmetrical orthogonal to the pump. At the same time, we can achieve the aim of outputing the frequency conversion of the Stokes and anti-stokes alternatively in appropriate transmission place by changing mismatch .