{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T04:05:26Z","timestamp":1760241926862,"version":"build-2065373602"},"reference-count":19,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2018,10,23]],"date-time":"2018-10-23T00:00:00Z","timestamp":1540252800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100003329","name":"Ministerio de Econom\u00eda y Competitividad","doi-asserted-by":"publisher","award":["TEC 2016-76021-C2-R"],"award-info":[{"award-number":["TEC 2016-76021-C2-R"]}],"id":[{"id":"10.13039\/501100003329","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100008530","name":"European Regional Development Fund","doi-asserted-by":"publisher","award":["AEI\/FEDER"],"award-info":[{"award-number":["AEI\/FEDER"]}],"id":[{"id":"10.13039\/501100008530","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>The 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.<\/jats:p>","DOI":"10.3390\/s18113593","type":"journal-article","created":{"date-parts":[[2018,10,24]],"date-time":"2018-10-24T02:59:40Z","timestamp":1540349980000},"page":"3593","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Virtual FBGs Using Saturable Absorbers for Sensing with Fiber Lasers"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2068-2956","authenticated-orcid":false,"given":"Luis","family":"Rodriguez-Cobo","sequence":"first","affiliation":[{"name":"CIBER-bbn, Instituto de Salud Carlos III, 28029 Madrid, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6856-9143","authenticated-orcid":false,"given":"Rosa A.","family":"Perez-Herrera","sequence":"additional","affiliation":[{"name":"Department of Electrical Electronic and Communication Engineering and Institute of Smart Cities (ISC), Public University of Navarra, 31006 Pamplona, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mar\u00eda A.","family":"Quintela","sequence":"additional","affiliation":[{"name":"Photonics Engineering Group, University of Cantabria, 39005 Santander, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rub\u00e9n","family":"Ruiz-Lombera","sequence":"additional","affiliation":[{"name":"Photonics Engineering Group, University of Cantabria, 39005 Santander, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9399-5398","authenticated-orcid":false,"given":"Manuel","family":"Lopez-Amo","sequence":"additional","affiliation":[{"name":"Department of Electrical Electronic and Communication Engineering and Institute of Smart Cities (ISC), Public University of Navarra, 31006 Pamplona, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5903-5967","authenticated-orcid":false,"given":"Jos\u00e9 M.","family":"Lopez-Higuera","sequence":"additional","affiliation":[{"name":"CIBER-bbn, Instituto de Salud Carlos III, 28029 Madrid, Spain"},{"name":"Photonics Engineering Group, University of Cantabria, 39005 Santander, Spain"},{"name":"Instituto de Investigaci\u00f3n Sanitaria Valdecilla (IDIVAL), 39005 Cantabria, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2018,10,23]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"587","DOI":"10.1109\/JLT.2011.2106479","article-title":"Fiber optic sensors in structural health monitoring","volume":"29","author":"Cobo","year":"2011","journal-title":"J. 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