Nonlinear propagation of pulses in multimode fiber with strong linear coupling

Optoelectronics Letters - Tập 16 - Trang 379-383 - 2020
Jin-yao Hu1,2, Jiang-yong He1, Yan-ge Liu1, Lu-he Zhang1, Rui-jing He1, Yao Li2, Zhi Wang1,2
1Tianjin Key Laboratory of Optoelectronic Sensor Sensing Network Technology, Institute of Modern Optics, Nankai University, Tianjin, China
2Science and Technology on Solid-State Laser Laboratory, Beijing, China

Tóm tắt

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.

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