Optical fibers are elements that are mainly used as a means to transmit light. In this paper, a fiber optic constituted by a core, a cladding and a Bragg grating in the core center has been studied. A laser beam with a Gaussian shape is let to propagate through the core of the fiber with an intensitydependent refractive index. In the center of the fiber, the refractive index will reach the highest value, focusing the beam. This property of the Gaussian beam to a specific intensity induces positive focusing is called self-focusing. A fiber Bragg grating is integrated inside the core of the fiber in order to control the self-focusing phenomenon. Five different materials are used for the grating for this purpose. An important relationship between the intensity of the beam inside the grating and, thus, the self-focusing and the material used is shown. The setup arrangement of the optical sensor is modeled through Comsol Multiphysics (Wave Optics Module), based on the FEM (Finite Element Method) solver.

Laser beam self-focusing in optical fiber controlled through FBG integration / Dinia, L.; Frezza, F.. - (2020), pp. 264-267. ((Intervento presentato al convegno 2020 IEEE International Workshop on Metrology for Industry 4.0 & IoT (MetroInd4.0&IoT) tenutosi a Roma.

Laser beam self-focusing in optical fiber controlled through FBG integration

L. Dinia;F. Frezza
2020

Abstract

Optical fibers are elements that are mainly used as a means to transmit light. In this paper, a fiber optic constituted by a core, a cladding and a Bragg grating in the core center has been studied. A laser beam with a Gaussian shape is let to propagate through the core of the fiber with an intensitydependent refractive index. In the center of the fiber, the refractive index will reach the highest value, focusing the beam. This property of the Gaussian beam to a specific intensity induces positive focusing is called self-focusing. A fiber Bragg grating is integrated inside the core of the fiber in order to control the self-focusing phenomenon. Five different materials are used for the grating for this purpose. An important relationship between the intensity of the beam inside the grating and, thus, the self-focusing and the material used is shown. The setup arrangement of the optical sensor is modeled through Comsol Multiphysics (Wave Optics Module), based on the FEM (Finite Element Method) solver.
2020 IEEE International Workshop on Metrology for Industry 4.0 & IoT (MetroInd4.0&IoT)
FBG; self-focusing; optical sensor; refractive index; laser
04 Pubblicazione in atti di convegno::04b Atto di convegno in volume
Laser beam self-focusing in optical fiber controlled through FBG integration / Dinia, L.; Frezza, F.. - (2020), pp. 264-267. ((Intervento presentato al convegno 2020 IEEE International Workshop on Metrology for Industry 4.0 & IoT (MetroInd4.0&IoT) tenutosi a Roma.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1408421
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