Miguel Soto, Verónica deLeandro González, DanielLópez Aldaba, AitorBeato López, Juan JesúsPérez de Landazábal Berganzo, José IgnacioAuguste, Jean-LouisJamier, RaphaelRoy, PhilippeLópez-Amo Sáinz, Manuel2018-09-192018-09-1920171424-822010.3390/s17122773https://academica-e.unavarra.es/handle/2454/30729In this work, the performance of five different fiber optic sensors at cryogenic temperatures has been analyzed. A photonic crystal fiber Fabry-Pérot interferometer, two Sagnac interferometers, a commercial fiber Bragg grating (FBG), and a -phase shifted fiber Bragg grating interrogated in In this work, the performance of five different fiber optic sensors at cryogenic temperatures has been analyzed. A photonic crystal fiber Fabry-Pérot interferometer, two Sagnac interferometers, a commercial fiber Bragg grating (FBG), and a π-phase shifted fiber Bragg grating interrogated in a random distributed feedback fiber laser have been studied. Their sensitivities and resolutions as sensors for cryogenic temperatures have been compared regarding their advantages and disadvantages. Additionally, the results have been compared with the given by a commercial optical backscatter reflectometer that allowed for distributed temperature measurements of a single mode fiber.12 p.application/pdfeng© 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution.Cryogenic temperatureThermometryInterferometric sensorOptical fiber sensorRandom distributed feedback fiber lasersOptical backscatter reflectometerinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess