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Optical memory effect in square multimode fibers

Antonio M. Caravaca-Aguirre, Adrien Carron, Sylvain Mezil, Irène Wang, and Emmanuel Bossy

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Abstract

We demonstrate experimentally the existence of a translational optical memory effect in square-core multimode fibers. We found that symmetry properties of square-core waveguides lead to speckle patterns shifting along four directions at the fiber output for any given shift direction at the input. A simple theoretical model based on a perfectly reflective square waveguide is introduced to predict and interpret this phenomenon. We report experimental results obtained with 532-nm coherent light propagating through a square-core step-index multimode fiber, demonstrating that this translational memory effect can be observed for shift distances up to typically 10 µm after propagation through several centimeters of fiber.

© 2021 Optical Society of America

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Supplementary Material (8)

NameDescription
Supplement 1       Supplemental document.
Visualization 1       Periodization of the input field of a perfectly reflective square waveguide.
Visualization 2       Measured input and output intensity patterns during the linear scan of the input pattern. The angle between the scan direction and the fiber axis is 0°.
Visualization 3       Measured input and output intensity patterns during the linear scan of the input pattern. The angle between the scan direction and the fiber axis is 22.5°.
Visualization 4       Measured input and output intensity patterns during the linear scan of the input pattern. The angle between the scan direction and the fiber axis is 45°.
Visualization 5       Cross-correlation functions as a function of the input translation distance, derived from experimental data, when the angle between the scan direction and the fiber axis is 0°.
Visualization 6       Cross-correlation functions as a function of the input translation distance, derived from experimental data, when the angle between the scan direction and the fiber axis is 22.5°.
Visualization 7       Cross-correlation functions as a function of the input translation distance, derived from experimental data, when the angle between the scan direction and the fiber axis is 45°.

Data Availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Figures (5)

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Equations (3)

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