当考虑自陡效应时,从光纤耦合器的耦合模方程出发,用偶奇超模对其进行了重写。讨论了当输入条件使奇偶超模的其中之一被单独激发时光纤耦合器中的自陡效应对调制不稳定性的影响。结果表明:在光纤耦合器中不论是正常色散区还是反常色散区,当输入功率一定时,随着自陡参数的增大,调制不稳定性增益谱较多地显示出了强度变弱和宽度变窄,最终导致光纤耦合器的超模发生畸变。 When considering the self-steepening effect, we start with the coupled-mode equations of fiber couplers and rewrite them with even-odd supermodels. The effect of self-steepening in the fiber coupler on modulation instability is discussed when the input condition excites one of the odd and even supermodes individually. The results show that, in the fiber coupler, both the normal dispersion region and the anomalous dispersion region, when the input power is constant, as the steepness parameter increases, the modulation unstable gain spectrum shows more intensity and width Narrow, eventually leading to fiber-optic coupler supermode distortion.