各向同性光纤中拉曼增益对光脉冲自陡峭的影响

Effect of Raman gain on the self-steepening characteristic in isotropic fiber

运用数学解析法导出了关于拉曼增益与自陡峭综合效应的光脉冲传输方程,在此基础上引入洛伦兹模型将拉曼增益整合到非线性系数中来研究光脉冲中拉曼增益对自陡峭效应的作用,重点分析了高斯脉冲在各向同性光纤中传播时,拉曼增益对其自陡峭效应具体影响方式,结果表明拉曼增益会减弱自陡峭中后沿偏移程度,减小脉冲展宽,但不会影响其峰值大小.

The optical pulse propagation equation has been deduced by Raman gain and self-steepening effect in an isotropic fiber by the mathematical analysis method. This research investigates the effect of Gaussian pulse that affected by Raman gain on the self-steepening characteristic, which is based on treating Raman gain to nonlinear coefficient as a new constant. It is precisely analyzed that the specific ways of influence that are made by Raman gain on self-steepening of Gaussian pulse in an isotropic fiber. The result shows that Raman gain leads to weaken the frequency shift of self-steepening and shorten the pulse broadening, however, it does not influence the intensity peak of Gaussian pulse.