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.
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