High‐Fidelity Image Reconstruction through Multimode Fiber via Polarization‐Enhanced Parametric Speckle Imaging

Abstract High‐quality signal transmission and imaging through a multimode fiber is essential for optical communications and medical endoscopic imaging, as it can provide high fidelity of the transferred information. Multiple mode superposition and mode coupling distort the incident wave, and a speckle pattern formed at the exit end of a multimode fiber makes the reconstruction of the original object challenging. The transmission matrix method is proposed to characterize the complex mesoscopic optical transmission channels, allowing light to traverse through the random medium. Here, a novel approach, namely polarization‐enhanced parametric speckle imaging, is proposed to improve imaging quality through a multimode fiber by utilizing the properties of polarization evolution through a multimode fiber. The demonstrated superior performance of polarization‐enhanced parametric speckle imaging opens novel avenues for optical communication system and photonics‐based endoscopic diagnosis.