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As described above, as the lengths of the arms change, so too does the distance traveled by each laser beam. A beam in a shorter arm will return to the beam splitter before the beam in a longer arm, then the situation switches as the arms oscillate between being longer and shorter. Arriving at different times, the waves of light no longer meet up nicely when recombined at the beam splitter. Instead, they shift in and out of alignment or "phase" as they merge while the wave is causing the arm lengths to oscillate. In simple terms, this results in a flicker of light emerging from the interferometer.
Interferometers act as a pass band on the signal, having a different rensponse to different frequencies, for this reason signal need to be corrected (with frequencies dependent weight), we call it "whitening" step
simple example on how use an autoenconder to efficient data codings and foldings
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