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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
When the WSL stabilization loop is not applied, (a) variations of peak position in the temporal domain (black line: peak position of the WSL, red line: reflected signal from the FBG); and (b) variation of the peak wavelength reflected from the FBG in the spectral domain.