Strain sensitivity control of fiber Bragg grating structures with fused tapers
ABSTRACT We report on the analysis and experimental validation of the strain sensitivity dependences of a fiber Bragg grating written in standard optical fiber when combined with fused tapers. By controlling the difference between the cross sections of the fused taper and the Bragg grating, the strain sensitivity of the Bragg wavelength can be changed by acting on the gauge length. The strain sensing characteristics of an interferometric structure formed by fabricating a fused taper in the middle of a fiber Bragg grating are also reported.
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ABSTRACT: A simple optical inclinometer based on a phase-shifted Bragg grating in a taper configuration is proposed. Two phase-shifted fiber Bragg gratings were fabricated using a DUV femtosecond laser technique in the taper region, with taper waist diameters of 30 μm and 50 μm. Both sensing heads were compared based on their response to angle and strain. Whereas the higher diameter sensor yielded a higher sensitivity to curvature (23.8 ± 0.3 pm/degree), the lower diameter one was more sensitive to strain (8.94 ± 0.04 pm/με).IEEE Photonics Technology Letters 02/2014; 26(4):405. DOI:10.1109/LPT.2013.2295323 · 2.18 Impact Factor