Listar por tema "Fiber optics sensors"
Mostrando ítems 21-26 de 26
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Sensitivity optimization with cladding-etched long period fiber gratings at the dispersion turning point
This work presents a refractive index sensor based on a long period fiber grating (LPFG) made in a reduced cladding fiber whose low order cladding modes have the turning point at large wavelengths. The combination of ... -
Sistema de interrogación multi-sensor basado en multiplexación en longitud de onda y tiempo
En este trabajo se propone un sistema de interrogación versátil y económico basada en la generación de pulsos empleando la modulación directa de diodos láser DFB. Se ha demostrado una resolución en longitud de onda de 1 ... -
Spectral evolution with incremental nanocoating of long period fiber gratings
The incremental deposition of a thin overlay on the cladding of a long-period fiber grating (LPFG) induces important resonance wavelength shifts in the transmission spectrum. The phenomenon is proved theoretically with ... -
Synthesis of Brillouin frequency shift profiles to compensate non-local effects and Brillouin induced noise in BOTDA sensors
We present a novel technique for Brillouin optical time domain analysis (BOTDA) sensors that simultaneously compensates non local effects and reduces Brillouin noise. The technique relies on the wavelength modulation of ... -
Ultrahigh-sensitivity sensors based on thin-film coated long period gratings with reduced diameter, in transition mode and near the dispersion turning point
The mode transition and the dispersion turning point have been explored for optimization of thin-film coated long period fiber gratings during the last years. In this work and additional parameter, the cladding diameter, ... -
Virtual FBGs using saturable absorbers for sensing with fiber lasers
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 ...