Cross-phase modulational instability created by two beams of lights in the region of minimum group-velocity dispersion is investiga ted based on extended nonlinear Schrdinger equation with the fiber loss and high -order dispersion considered.

For two beams of input lights dispreading in opposite direction,the effect of third-order and fourth-order dispersion on cross-phase modulational instability based on extended nonlinear Schr dinger equation is investigated.

The effect of third-order and fourth-order dispersion on cross-phase modulational instability based on extended nonlinear Schrdinger equation is investigated with the fiber loss and high-order dispersion considered.

Taking into account the loss and the second-to fourth-order dispersions,the condition and gain spectra of modulation instability induced by cross-phase modulation in different dispersion regions of optical fibers are analyzed when the perturbation frequencies of the two optical waves are equal and unequal,respectively.

Taking into account the second-to the fourth-order dispersion and the quintic nonlinearity of an optical fiber,the synthetical effects of the fourth-order dispersion,the quintic nonlinearity and the input optical power on modulation instability induced by cross-phase modulation of two optical waves are investigated.