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This fiber-based reflector, inscribed by femtosecond laser direct writing, was fabricated into a single mode fiber with a length of 32 mm. The dual-wavelength laser obtained, centered at 1527.7 nm and 1530.81 nm, showed an optical signal-to-noise ratio over 46 dB when pumped at 150 mW. Another feature of this laser was that the power difference between the two channels was just 0.02 dB, regardless of the pump power, resulting in a dual emission laser with high equalization. On the other hand, an output power level and a central wavelength instability as low as 0.3 dB and 0.01 nm were measured, in this order for both channels. Moreover, the threshold pump power was 40 mW. Finally, the performance of this dual-wavelength fiber laser enhanced with a random reflector for sensing applications was studied, achieving the simultaneous measurement of strain and temperature with sensitivities around 1 pm\/\u03bc\u03b5 and 9.29 pm\/\u00b0C, respectively.<\/jats:p>","DOI":"10.3390\/s22186888","type":"journal-article","created":{"date-parts":[[2022,9,13]],"date-time":"2022-09-13T04:05:41Z","timestamp":1663041941000},"page":"6888","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["A Dual-Wavelength Fiber Laser Sensor with Temperature and Strain Discrimination"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8877-2050","authenticated-orcid":false,"given":"Arturo","family":"Sanchez-Gonzalez","sequence":"first","affiliation":[{"name":"Department of Electrical, Electronic and Communication Engineering, Public University of Navarra, 31006 Pamplona, Spain"},{"name":"Institute of Smart Cities (ISC), Public University of Navarra, 31006 Pamplona, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6856-9143","authenticated-orcid":false,"given":"Rosa Ana","family":"Perez-Herrera","sequence":"additional","affiliation":[{"name":"Department of Electrical, Electronic and Communication Engineering, Public University of Navarra, 31006 Pamplona, Spain"},{"name":"Institute of Smart Cities (ISC), Public University of Navarra, 31006 Pamplona, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4263-8243","authenticated-orcid":false,"given":"Pablo","family":"Roldan-Varona","sequence":"additional","affiliation":[{"name":"Photonics Engineering Group, University of Cantabria, 39005 Santander, Spain"},{"name":"CIBER-BBN, Instituto de Salud Carlos III, 28029 Madrid, Spain"},{"name":"Instituto de Investigacion Sanitaria Valdecilla (IDIVAL), 39005 Cantabria, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Miguel","family":"Duran-Escudero","sequence":"additional","affiliation":[{"name":"Department of Electrical, Electronic and Communication Engineering, Public University of Navarra, 31006 Pamplona, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2068-2956","authenticated-orcid":false,"given":"Luis","family":"Rodriguez-Cobo","sequence":"additional","affiliation":[{"name":"CIBER-BBN, Instituto de Salud Carlos III, 28029 Madrid, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jose Miguel","family":"Lopez-Higuera","sequence":"additional","affiliation":[{"name":"Photonics Engineering Group, University of Cantabria, 39005 Santander, Spain"},{"name":"CIBER-BBN, Instituto de Salud Carlos III, 28029 Madrid, Spain"},{"name":"Instituto de Investigacion Sanitaria Valdecilla (IDIVAL), 39005 Cantabria, 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, Public University of Navarra, 31006 Pamplona, Spain"},{"name":"Institute of Smart Cities (ISC), Public University of Navarra, 31006 Pamplona, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,9,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Harun, S.W., and Arof, H. 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