4 ) in addition , a class of optical solitary wave solutions , such as the bright - bright , dark - dark , bright - dark , and combined solitary waves , especially the interesting w - shaped solitary wave solutions for chnls equations are found under certain parametric conditions . the properties of these optical solitary solutions are presented . furthermore , we investigate the stability of theses solitary waves under some initial perturbations by employing numerical simulation methods 4 )在一定参数下得到了描述超短光脉冲不同偏振分量在双折射光纤中传输特性的耦合高阶非线性薛定谔方程( chnlse )的亮亮、暗暗、亮暗、组合孤波解析解，包括一种非常特殊的“ w ”型孤波解，对这些孤波解的特性进行了分析，也讨论了它们的稳定性。
Generation of multi - wavelength signals and ultra - short pulses are of great importance for a wide range of applications such as in wavelength - division - multiplexed ( wdm ) and optical time - division - multiplexed ( otdm ) fiber communication systems , fiber sensing , nonlinear optics , optical instrument testing , and time - resolved spectroscopy 密集波分复用( dwdm )和光时分复用( otdm )是实现光纤通信系统升级扩容的有效途径,而多波长信号及高重复频率的超短光脉冲的产生则是与其相对应的两种关键技术。
