Benedicto David, Collados María Victoria, Martín Juan C, Atencia Jesús, Mendoza-Yero Omel, Vallés Juan A
Departamento de Física Aplicada, Instituto de Investigación en Ingeniería de Aragón (I3A), Facultad de Ciencias, Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain.
Institut de Noves Tecnologies de la Imatge (INIT), Universitat Jaume I, 12080 Castelló, Spain.
Micromachines (Basel). 2022 Nov 17;13(11):2004. doi: 10.3390/mi13112004.
Modal decomposition of light is essential to study its propagation properties in waveguides and photonic devices. Modal analysis can be carried out by implementing a computer-generated hologram acting as a match filter in a spatial light modulator. In this work, a series of aspects to be taken into account in order to get the most out of this method are presented, aiming to provide useful operational procedures. First of all, a method for filter size adjustment based on the standard fiber LP-mode symmetry is presented. The influence of the mode normalization in the complex amplitude encoding-inherent noise is then investigated. Finally, a robust method to measure the phase difference between modes is proposed. These procedures are tested by wavefront reconstruction in a conventional few-mode fiber.
光的模态分解对于研究其在波导和光子器件中的传播特性至关重要。模态分析可以通过在空间光调制器中实现作为匹配滤波器的计算机生成全息图来进行。在这项工作中，提出了为充分利用该方法而需要考虑的一系列方面，旨在提供有用的操作程序。首先，提出了一种基于标准光纤LP模式对称性的滤波器尺寸调整方法。然后研究了模式归一化对复振幅编码固有噪声的影响。最后，提出了一种测量模式之间相位差的稳健方法。这些程序在传统的少模光纤中通过波前重建进行了测试。
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