色散位移光纤中拉曼散射与参量放大增益谱

Gain Spectra of Raman Scattering and Parametric Amplification in Birefringence Dispersion Shifted Fiber

由斯托克斯波和反斯托克斯波所满足的耦合微分方程,考虑泵浦波是线偏振光,其偏振方向沿x轴,推导出了同偏振方向受激拉曼散射和参量放大同时作用下,斯托克斯波和反斯托克斯波的增益谱。引入平行拉曼散射增益系数的洛伦兹模型,研究了色散位移光纤中斯托克斯波和反斯托克斯波的增益谱随相关参数的变化关系。结果表明,斯托克斯波与反斯托克斯波的增益谱呈现出不对称,其增益谱与三色散系数β_3无关。同时讨论了反斯托克斯波与斯托克斯波|E_(ax)/E_(sx)|的比值随频移的增加而快速衰减的变化特性。

Taking account of the coupling differential equations under the effect of Stokes and anti-Stokes for the pump wave linearly polarized and aligned with the x-axis direction,the gain coefficient for the Stokes and anti-Stokes have been derived from simultaneously act of stimulated Raman scattering and parametric amplification in the same x polarization.The Lorenz model of parallel gain coefficient is introduced in this equation. The correlation between the gain spectrum and correlative parameter studied in dispersion-shifted fiber.The conclusion shows that gain spectrum is dissymmetrical with the Stokes and anti-Stokes wave and has no relation with third-order dispersion.At the same time,the ratio of Stokes and anti-Stokes ｜E_（ax）/E_（sx）｜ increases with frequency shift,then it rapidly reduced.