Torsion‐dependent spectral response of long‐period fiber grating based on electric arc technique with axial rotation of the fiber

Abstract

We present a novel technique for manufacturing a long‐period fiber grating (LPFG) with enhanced torsion sensitivity based on electric arc technique. The proposed method rotates the fiber around its axis of rotation at each electric arc discharge. We experimentally investigated the torsion‐dependent spectral response of the produced grating and the results showed that an enhanced linear torsion sensitivity up to 0.197 nm/(rad/m) was achieved, which is higher than that of the conventional arc‐induced LPFGs.

Arc-Induced Long-Period Fiber Gratings at INESC TEC. Part II: Properties and Applications in Optical Communications and Sensing

“…LPFGs are sensitive to other parameters such as strain [ 105 , 106 , 107 , 108 ], bending [ 109 , 110 , 111 ], torsion [ 112 , 113 , 114 ], pressure [ 115 , 116 ] and surrounding refractive index [ 89 , 117 , 118 , 119 , 120 , 121 , 122 , 123 , 124 ]. On contrary to what happens for the temperature sensitivity, the strain sensitivity is typically an order of magnitude lower than for FBGs.…”

Novo método de fabricação de redes de período longo com baixa perda dependente da polarização

“…Já em aplicações de detecção, essas redes podem ser utilizadas para medição de diversos parâmetros, como temperatura [9], deformação [10], torção [11], corrente elétrica [12] e índice de refração [13]. O monitoramento desses parâmetros é de grande importância e aplicabilidade ao se desenvolver processos químicos e industriais, no monitoramento ambiental, de estruturas e também, na indústria de combustíveis.…”