Taken into account the fiber loss,the fundamental gain spectrum of modulation instability (MI) induced cross-phase modulation (XPM) is presented from the nonlinear Schrodinger equation.

• 在考虑光纤损耗的情况下，从非线性薛定谔方程出发，推出了交叉相位调制(XPM)所致调制不稳定性(MI)的基态增益谱。