色散缓变光纤中交叉相位调制不稳定增益谱

Modulation instability gain spectrum of cross-phase modulation in decreasing dispersion fiber

从非线性薛定谔方程出发得到了色散缓变光纤中交叉相位调制 (XPM )不稳定性的增益谱。结果表明 ,XPM产生的调制不稳定性既可以在光纤反常色散区产生 ,也可在正常色散区产生 ,反常色散区的增益谱宽比正常色散区宽 ,且色散缓变光纤中XPM不稳定增益谱宽比普通光纤中XPM不稳定增益谱宽宽 ,增益峰值高。色散缓变光纤是XPM调制不稳定性的较好色散介质。

Modulation instability gain spectrum resulted from cross-phase modulation(XPM) in decreasing dispersion fiber (DDF) is presented from nonlinear Schrodinger equation. The results show that XPM-induced modulation instability exists not only in the anomalous-dispersion regime but also in the normal dispersion regime; what's more,the spectrum width of the former is wider than that of the latter. The spectrum width in DDF is wider than that of in ordinary dispersion fiber(ODF) and the gain peak is also higher. DDF is a good dispersion medium to produce modulation instability of XPM.