Characterization and Exploitation of the Rotational Memory Effect in Multimode Fibers
arxiv(2023)
摘要
In an ideal perfectly straight multimode fiber with a circular-core, the
symmetry ensures that rotating the input wavefront leads to a corresponding
rotation of the output wavefront. This invariant property, known as the
rotational memory effect (RME), remains independent of the typically unknown
output profile. The RME thus offers significant potential for imaging and
telecommunication applications. However, in real-life fibers, this effect is
degraded by intrinsic imperfections and external perturbations, and is
challenging to observe because of its acute sensitivity to misalignments and
aberrations in the optical setup. Thanks to processing involving a spatial
light modulator, we efficiently overcome these measurement biases, allowing for
precise quantification of the RME. We establish an experimental and theoretical
framework for studying and manipulating the RME in multimode fibers.
Theoretical predictions are consistent with experimental data and simulations,
connecting the shape of the angular-dependent correlation of the RME to the
geometrical properties of the core deformation. This work opens the road for
accurate characterization of the distributed disorder originating from the
fabrication process and calibration-less imaging in multimode fibers.
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