The Institute of Optics, University of Rochester, Rochester, New York 14627, USA.
Department of Electrical Engineering, Boston University, Boston, Massachusetts 02215, USA.
Phys Rev Lett. 2019 Jan 18;122(2):023901. doi: 10.1103/PhysRevLett.122.023901.
We show numerically that under certain conditions noise-induced soliton self-mode conversion dominates over soliton self-frequency shift for a soliton in a high order spatial mode of a multimode optical fiber. The input soliton has to be group index matched to a lower order mode for a frequency separation for which the Raman gain is non-negligible, and this condition determines the wavelength of the pulse growing from noise. The phenomenon has no known analogs in single-mode or graded-index fibers. The results demonstrate that it is possible for a noise-induced physical process to dominate over a seeded one even for noise levels at the fundamental limit.
我们通过数值计算表明，在某些条件下，对于多模光纤中高阶空间模式的孤子，噪声诱导的孤子自模式转换将主导孤子自频移。对于 Raman 增益不可忽略的频率间隔，输入孤子必须与低阶模式的群折射率匹配，而这个条件决定了从噪声中增长的脉冲的波长。在单模或渐变折射率光纤中，没有已知的类似现象。结果表明，即使在基本极限的噪声水平下，噪声诱导的物理过程也有可能主导种子过程。
