Experimental characterization of mode content in fibers using S2 imaging without a DFT

Alex Chedid; Yves Quiquempois; Esben Ravn Andresen; Laurent Bigot

doi:10.1117/12.2621525

19 May 2022 Experimental characterization of mode content in fibers using S² imaging without a DFT

Alex Chedid, Yves Quiquempois, Esben Ravn Andresen, Laurent Bigot

Author Affiliations +

Proceedings Volume 12140, Micro-Structured and Specialty Optical Fibres VII; 121400H (2022) https://doi.org/10.1117/12.2621525
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

Spatially and spectrally resolved imaging, the so-called S2 imaging technique, is a method to determine the modal content of multimode fibers, the power carried by each mode, and the Multi-Path Interference (MPI) level. However, a drawback of this approach is the need for a highly stable and precisely tunable laser source, since Discrete Fourier Transformation (DFT) is used to extract time delays and reconstruct the powers of mode beatings. This work demonstrates both theoretically and experimentally that a “DFT-free S2 method” can identify and quantify the modal content of a fiber probed under different conditions by simple spatial correlation analysis of images recorded at different wavelengths.

Conference Presentation

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Alex Chedid, Yves Quiquempois, Esben Ravn Andresen, and Laurent Bigot "Experimental characterization of mode content in fibers using S² imaging without a DFT", Proc. SPIE 12140, Micro-Structured and Specialty Optical Fibres VII, 121400H (19 May 2022); https://doi.org/10.1117/12.2621525

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