Abstract
A phase-shifted eccentric core fiber Bragg grating (PS-ECFBG) fabricated by electric arc discharge (EAD) is presented and demonstrated. It is composed of a fraction of eccentric core fiber fusion spliced in between two pieces of commercial single mode fibers, where a PS-FBG was written. The EAD in this work could flexibly change the amount of phase-shift by changing the discharge number or discharge duration. Because of the offset location of the eccentric core and the ultra-narrow resonant peak of the PS-ECFBG, it has a higher accuracy for measuring the directional bend. The elongation and compression of the eccentric core keep the magnitude of phase shift still unchanged during the bending process. The bending sensitivities of the PS-ECFBG at two opposite most sensitive directions are 57.4 pm/m−1 and −51.5 pm/m−1, respectively. Besides, the PS-ECFBG has the potential to be a tunable narrow bandpass filter, which has a wider bi-directional adjustable range because of the bending responses. The strain and temperature sensitivities of the PS-ECFBG are experimentally measured as well, which are 0.70 pm/με and 8.85 pm/°C, respectively.
Highlights
Phase-shifted fiber Bragg grating (PS-FBG) was firstly introduced by C
PS-ECFBG is sensitive to directional bending and has the potential to be a tunable narrow bandpass filter with a wider bi-directional adjustable range
A mass with a weight of 3 g is hung on the single mode fiber (SMF) for keeping the PS-FBG straight with nearly no strain induced during the bending process
Summary
Phase-shifted fiber Bragg grating (PS-FBG) was firstly introduced by C. A type of PS-FBG based on an in-grating bubble fabricated by femtosecond laser ablation was proposed [10]. Such a method of microstructure has a Sensors 2018, 18, 1168; doi:10.3390/s18041168 www.mdpi.com/journal/sensors. The refractive index of the liquid filled in the gap would influence the transmission spectrum Those sensors mentioned above suggested that the PS-FBGs have a variety of sensing information to be utilized. A PS-FBG in eccentric core fiber (ECF) fabricated by EAD method for directional bending measurement is presented. Compared with the ordinary ECF-based FBG, the proposed PS-FBG in ECF has a higher accuracy for sensing detection because of the ultra-narrow resonant peak. PS-ECFBG is sensitive to directional bending and has the potential to be a tunable narrow bandpass filter with a wider bi-directional adjustable range
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