Modulation instability in fiber grating with nonlinearity management is studied based on the nonlinear coupled-mode equations. The dispersion relation for modulation instability is obtained.

基于非线性耦合模方程，研究了非线性管理光纤光栅中的调制不稳定性，得到了调制不稳定性的色散关系。

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At last, this paper put forward a new dispersion management method, dispersion decreasing densely dispersion management.

最后，本文提出了一种新的色散管理方法——色散递减密集色散管理。

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System simulation shows that compared to former methods, this new dispersion management can effectively improve system performance, and extend transmission distance.

系统仿真表明，这种新的色散管理方法较之于以前的色散管理方法能够更有效地提高系统的性能，延长传输距离；

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