Nonlinear propagation of pulses in multimode fiber with strong linear coupling

Multimode fiber has a richer spatial dimension than single-mode fiber, and is an ideal platform for studying many novel nonlinear effects. We established a strong linear coupling and short-range fiber model to understand the interactive effects of linear coupling and nonlinear effects. We find that strong linear coupling can compensate for the group delay between eigenmodes and cause energy fluctuation between modes which weakens the nonlinear effects. In high energy pulses, the interaction of linear coupling and nonlinear effects can help producing weak dispersion waves when the spectrum is broadened. Since linear coupling in a mode group is common and unavoidable, these results may provide a certain theoretical explanation for multi-mode nonlinear phenomena.     

大型地震工程模拟研究设施实验厂房钢结构及工艺设备埋件施工技术

<正>获奖情况：2022年中国安装协会科学技术进步奖二等奖一、成果研究背景随着细长型、异型结构的出现及新材料在建筑中的应用,对结构抗震试验方法的要求越来越高。为满足实际工程及抗震研究的需要,各国学者都在进行积极的探索和尝试。大型地震工程模拟研究设施实验厂房见图1。