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在定期调节的多模纤维中进行非赫密特式模式清洁

Mohammad Nayeem Akhter¹, Salim B Ivars¹, Muriel Botey¹

¹Universitat Politecnica Catalunya, Dep. de Fisica, Rambla Sant Nebridi 22, 08222, Terrassa (Barcelona), Spain.

Physical review letters

|August 11, 2023

概括

同时调节纤维特性使单向合成为可能,控制高阶模式激发. 这种技术可以实现有效的模式清洁,以实现单模式,空间连贯的输出.

科学领域:

光学和光子学在光学和光子学.
在光纤中的波传播.

背景情况:

分级索引多模纤维 (GRIN-MMF) 通常支持多个横向模式,导致信号降解.
控制模式合对于实现高质量的光传输至关重要.

研究的目的:

为了研究在GRIN-MMF中同时调制传播常数和增益/损失对模式合的影响.
展示一种控制高阶横向模式激发和实现模式清理的方法.

主要方法:

使用高斯束近似的半分析预测.
通过解决波传播方程的数值验证,使用非赫米斯调制的潜能.

主要成果:

同时调制诱导光纤模式之间的单向合.
调制参数决定了高阶模式激发是否增强或减少.
在特定的调制条件下,预测有效模式清洗,导致单模式输出.

结论:

拟议的调制技术为多模纤维中控制模式行为提供了一种新的方法.
这种方法对于需要高质量,空间连贯的光学输出应用具有潜力.

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