Phase shift in optical fiber induced by mechanical stress

This work refers to the vibration optimization of a fiber optic interferometer whose detection performance may be compromised due to external mechanical or acoustic excitations. In such an interferometer, the optical path is split into two arms, with one significantly longer than the other. Optimizing the interferometer involves minimizing the phase difference of light caused by mechanical deformations, particularly in the long arm, resulting from unintended external excitations. Extending previous works from Hocker, who considered isotropic compression and longitudinal stress, we also investigate an additional mechanical load on the fiber: torsional stress. All these different loads will be compared to determine which one induces the most significant phase shift. Ultimately, incorporating protection into the equations will lead to a more realistic model. This approach will allow us to identify the most suitable protective materials to achieve a fiber optic interferometer resilient to external constraints.