论文标题
在定期调制的多模纤维中的非热模式清洁
Non-Hermitian Mode Cleaning in Periodically Modulated Multimode Fibers
论文作者
论文摘要
我们表明，沿多模纤维的传播常数和增益/损耗系数的同时调节导致模式之间的单向耦合，这取决于调制参数，导致更高级横向模式的激发增强或减少。在后一种情况下，预测有效模式清洁，在理想情况下，导致单模在空间上相干输出。该效果是在简化的高斯梁近似上进行半分析预测的，并通过求解波传播方程来引入调制电势，从而在数值上证明了该效果。
We show that the simultaneous modulation of the propagation constant and of the gain/loss coefficient along the multimode fibers results in unidirectional coupling among the modes, which, depending on the modulation parameters, leads to the enhancement or reduction of the excitation of higher order transverse modes. In the latter case, effective mode-cleaning is predicted, in ideal case resulting in single-mode spatially coherent output. The effect is semi-analytically predicted on a simplified Gaussian beam approximation and numerically proven by solving the wave propagation equation introducing the modulated potential.
