Dispersive-wave generation in higher-order ${\text{HE}_{1l}}$ modes of step-index optical fibers is studied numerically. The limits to power scaling from nonlinear intermodal couplings are investigated. It is shown that single-mode operation is possible up to power levels of a few MW, whereas both pump and dispersive-wave power distributes over several modes for higher powers, making the frequency conversion process less specific and efficient. The use of a circularly polarized pump is found to be beneficial for power scaling, both due to a reduced effective nonlinearity, and a reduction in intermodal couplings to ${\text{LP}_{2l}}$-like modes.

中文翻译：

---

高阶光纤模式中色散波产生的功率缩放

数值研究了阶跃光纤在高阶$ {\ text {HE} _ {1l}} $模式下的色散波产生。研究了非线性联运耦合对功率缩放的限制。结果表明，单模运行可能会达到几兆瓦的功率水平，而泵浦功率和色散波功率会在几种模式下分配以获得更高的功率，从而使频率转换过程的具体性和效率降低。使用圆极化泵的被发现是用于功率缩放有益的，既由于减少有效的非线性，以及在联运联轴器减少$ {\文本{LP} _ {2升}} $样模式。