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Optical fiber interferometers based on arc-induced long period gratings at INESC TEC

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Resumo:In this work, we review the most important achievements of an INESC TEC long-period-grating-based fiber optic Michelson and Mach–Zehnder configuration modal interferometer with coherence addressing and heterodyne interrogation as a sensing structure for measuring environmental refractive index and temperature. The theory for Long Period Grating (LPG) interferometers and coherence addressing and heterodyne interrogation is presented. To increase the sensitivity to external refractive index and temperature, several LPG interferometers parameters are studied, including order of cladding mode, a reduction of the fiber diameter, different type of fiber, cavity length and the antisymmetric nature of cladding modes.
Autores principais:Caldas, Paulo
Outros Autores:Rego, Gaspar
Assunto:Long period grating Optical fiber interferometric sensors Low-coherence interferometric True pseudo-heterodyne technique
Ano:2021
País:Portugal
Tipo de documento:recensão
Tipo de acesso:acesso aberto
Instituição associada:Instituto Politécnico de Viana do Castelo
Idioma:inglês
Origem:Repositório Científico IPVC

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