基于非线性包络方程我们研究了平面非线性介质波导中的时空不稳定性，得到了有拉曼散射效应情形下不稳定性调制的增益谱的表达式。
Spatiotemporal instability in the planar nonlinear dielectric waveguide is analyzed by nonlinear equation, and the expression of Modulation instability(MI) gain in Raman Scattering is obtained.
从非线性薛定谔方程出发得到了色散缓变光纤（DDF）中交叉相位调制（XPM）不稳定增益谱。
Modulation instability resulted from cross phase modulation(XPM) in decreasing dispersion fiber(DDF) is presented from nonlinear Schrodinger equation.
由于受激喇曼散射的作用，使得喇曼增益谱叠加到光纤中的调制不稳定性增益谱上。
Due to the role of stimulated Raman scattering, Raman gain spectrum is superposed over the conventional MI gain spectrum in optical fibers.
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