The frequency modulation effects of positive dipole (unipole) forcing source on LFO is stronger than negative dipole (unipole), and the wave oscillation quicken evidently.
正偶(单)极强迫源对大气低频振荡的调制作用强于负偶(单)极，波动振荡明显加快。
But for the influence of self phase modulation, the ISI limited distance of positive dispersion is much longer than that of negative dispersion.
但是，由于非线性自相位调制效应的影响，在其它参数相同条件下，正色散时的ISI限制距离比负色散时要长得多。
The results show that, in case of high-order dispersion, the positive and negative quintic nonlinearity also intensifies and weakens the cross-phase modulation instability, respectively.
研究表明，在高阶色散下，正负五阶非线性的存在仍然分别对交叉相位调制不稳定性起加强和削弱的作用；
When the second-order and fourth-order dispersions are respectively positive and negative, no modulation instability occurs.
当二阶和四阶色散分别为正和负时，无调制不稳定性；
When the second-order and fourth-order dispersions are respectively positive and negative, no modulation instability occurs.
当二阶和四阶色散分别为正和负时，无调制不稳定性；
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