Abstract
Tilted fiber Bragg grating (TFBG) and reflective tilted fiber Bragg grating (R-TFBG) were proposed and demonstrated in the graded-index multimode fiber (GI-MMF). The TFBGs with grating planes tilted at an angle of 2.5° corresponding to the fiber axis were inscribed. The TFBGs in the GI-MMF had the good linear sensitivity to the temperature, strain and curvature. The fiber was then cleaved at the far end of the TFBG to form an R-TFBG using the Fresnel reflection of the fiber end. The reflective spectra of the R-TFBG were given, and the temperature sensing properties were also investigated.
Highlights
Tilted fiber Bragg grating (TFBG) have been extensively investigated in recent years due to its unique properties in the field of sensing [1,2,3,4,5,6,7,8,9,10,11,12]
The fiber was cleaved at the far end of the TFBG to form an reflective tilted fiber Bragg grating (R-TFBG) using the Fresnel reflection of the fiber end
Wanseret et al [13] calculated the spectrum of a Bragg grating in the MMF and used it as a bend sensor
Summary
Tilted fiber Bragg grating (TFBG) have been extensively investigated in recent years due to its unique properties in the field of sensing [1,2,3,4,5,6,7,8,9,10,11,12]. Mizunami et al [14] experimentally reported the spectral properties of MMF gratings and investigated the temperature sensing performance and the polarization characteristics. Two kinds of TFBG sensors are fabricated based on the graded-index multimode fiber, and the sensing properties are fully explored
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