Open AccessSelective fiber Bragg grating inscription in four-core fiber for two-dimension vector bending sensing
Author(s) -
Weijia Bao,
Namita Sahoo,
Zhongyuan Sun,
Changle Wang,
Shen Liu,
Yiping Wang,
Lin Zhang
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.398794
Subject(s) - fiber bragg grating , optics , materials science , bending , core (optical fiber) , fiber , phosfos , graded index fiber , long period fiber grating , fiber optic sensor , polarization maintaining optical fiber , photonic crystal fiber , plastic optical fiber , wavelength , optical fiber , physics , composite material
The paper presents selective fiber Bragg grating (FBG) inscription in four-core fiber based on a phase mask scanning method. The inscription factors are systematically investigated, which involves fiber core position and focused laser beam size in fiber, etc. Several specific inscriptions (including individual, dual and all inscriptions) are demonstrated. Two orthogonally positioned cores are selectively inscribed and applied to two-dimension vector bending measurement. The measured bending sensitivities of two FBGs range from -54.3 pm/m -1 to 52.2 pm/m -1 and -53.7 pm/m -1 to 52.8 pm/m -1 , respectively. More importantly, it has been revealed that their sensitivities versus bending direction follow regular cosinoidal and sinusoidal distribution. The direction and amplitude of the vector bending can be recovered using measured central wavelength shifts of those two FBGs.