Pérez Herrera, Rosa AnaRoldán Varona, PabloSánchez González, ArturoRodríguez Cobo, LuisLópez Higuera, José MiguelLópez-Amo Sáinz, Manuel2023-03-302023-03-302023Perez-Herrera, R. A., Roldan-Varona, P., Sanchez-Gonzalez, A., Rodriguez-Cobo, L., Lopez-Higuera, J. M., & Lopez-Amo, M. (2023). Wavelength-switchable L-band fiber laser assisted by random reflectors. Journal of the European Optical Society-Rapid Publications, 19(1), 2. https://doi.org/10.1051/jeos/20220151990-257310.1051/jeos/2022015https://academica-e.unavarra.es/handle/2454/45008A wavelength-switchable L-band erbium-doped fiber laser (EDFL) assisted by an artificially controlled backscattering (ACB) fiber reflector is here presented. This random reflector was inscribed by femtosecond (fs) laser direct writing on the axial axis of a multimode fiber with 50 lm core and 125 lm cladding with a length of 17 mm. This microstructure was placed inside a surgical syringe to be positioned in the center of a high-precision rotation mount to accurately control its angle of rotation. Only by rotating this mount, three different output spectra were obtained: a single wavelength lasing centered at 1574.75 nm, a dual wavelength lasing centered at 1574.75 nm and 1575.75 nm, and a single wavelength lasing centered at 1575.5 nm. All of them showed an optical signal-to-noise ratio (OSNR) of around 60 dB when pumped at 300 mWapplication/pdfeng© The Author(s). This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.Fiber laserL-bandRandom reflectorWavelength-switchableinfo:eu-repo/semantics/article2023-03-30info:eu-repo/semantics/openAccess