Rodríguez Cobo, LuisPérez Herrera, Rosa AnaQuintela, M. A.Ruiz Lombera, RubénLópez-Amo Sáinz, ManuelLópez Higuera, José Miguel2019-07-172019-07-1720181424-822010.3390/s18113593https://academica-e.unavarra.es/handle/2454/33612The spectral narrowing of Fiber Bragg Gratings (FBGs) introduced by unpumped Er-doped fiber (EDF) was analyzed for fiber lasers (FL). Owing to spatial hole burning (SHB), the spectral response of a virtual FBG can be employed for narrowing the band pass filter employed to determine the lasing wavelength of laser cavities. A common FL was mounted to analyze the spectral stability of the method, and a FL sensor for strain and temperature measurements was experimentally characterized to determine the stability of the narrowing effect achieved by the unpumped EDF, which acts as a virtual FBG. The results exhibited remarkably good narrowing effects of the spectral response of uniform FBGs.10 p.application/pdfeng© 2018 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 (CC BY) license.Erbium doped fibersFiber bragg gratingsFiber lasersFiber optics sensorsSingle-mode laserTemperature sensorinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess