Del Villar, IgnacioRuiz Zamarreño, CarlosHernáez Sáenz de Zaitigui, MiguelArregui San Martín, Francisco JavierMatías Maestro, Ignacio2018-04-052018-04-0520101094-408710.1364/OE.18.020183https://academica-e.unavarra.es/handle/2454/28193Two optical fiber devices have been coated in parallel: a long period fiber grating (LPFG) and a cladding-removed multimode optical fiber (CRMOF). The progressive coating of the LPFG by means of the layer-by-layer electrostatic-self-assembly, permits to observe a resonance wavelength shift of the attenuation bands in the transmission spectrum. The cause of this wavelength shift is the reorganization of the cladding mode effective indices. The cause of this modal reorganization can be understood with the results observed in the CRMOF coated in parallel. A lossy-moderesonance (LMR) is generated in the same wavelength range of the LPFG attenuation bands analyzed. Moreover, the thickness range where the wavelength shift of the LPFG attenuation bands occurs coincides exactly with the thickness range where the LMR can be visualized in the transmission spectrum. These phenomena are analyzed theoretically and corroborated experimentally. The advantages and disadvantages of both optical fiber devices are explained.application/pdfeng© 2010 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.Fiber optics and optical communicationsFiber Bragg gratingsThin films, theory and designThin films, deposition and fabricationinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess