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.
通过对模型进行线性稳定性分析，发现这些时空斑图是由于短波不稳定性所引起的。
It is found that these pattern are caused by short-wave instability through the linear stability analysis.
结论：快速刺激诱发的室颤存在时空的不稳定性。
Conclusion: Spatiotemporal instability exists in VF induced by rapid pacing.
结论：快速刺激诱发的室颤存在时空的不稳定性。
Conclusion: Spatiotemporal instability exists in VF induced by rapid pacing.
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