Cladding mode effect in superstructure fiber Bragg gratings and its applications in simultaneous strain and temperature measurement

2002 ◽  
Author(s):  
Bai-Ou Guan ◽  
Wai-Sing Man ◽  
Hwa-Yaw Tam
Keyword(s):  
Temperature Measurement ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Mode Effect ◽  
Cladding Mode

scholarly journals Cladding mode coupling in highly localized fiber Bragg gratings II: complete vectorial analysis

2012 ◽  
Vol 20 (19) ◽  
pp. 21434 ◽  
Author(s):  
Jens U. Thomas ◽  
Nemanja Jovanovic ◽  
Ria G. Krämer ◽  
Graham D. Marshall ◽  
Michael J. Withford ◽  
...  
Keyword(s):  
Mode Coupling ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Cladding Mode

scholarly journals Fabrication and Characterization of Line-by-Line Inscribed Tilted Fiber Bragg Gratings Using Femtosecond Laser

Sensors ◽  
2021 ◽  
Vol 21 (18) ◽  
pp. 6237
Author(s):  
Hongye Li ◽  
Xiaofan Zhao ◽  
Binyu Rao ◽  
Meng Wang ◽  
Baiyi Wu ◽  
...  
Keyword(s):  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Fiber Axis ◽  
Central Plane ◽  
Tilted Angle ◽  
Fabrication And Characterization ◽  
Cladding Mode ◽  
Basic Characteristics ◽  
Birefringence Effect

In this paper, we studied the basic characteristics of tilted fiber Bragg gratings (TFBGs), inscribed line-by-line. Experimental results showed that if the TFBGs were located within different planes parallel to the fiber axis, the spectra performed differently. For 2°TFBG, if it was located near the central plane, the Bragg resonance was stronger than ghost mode resonance, and the order reversed if it was located near the boundary between core and cladding. As the tilted angle increased, the range of cladding mode resonance increased. When the tilted angle was larger than 12°, the birefringence effect was observed. Based on the birefringence phenomenon, torsion characteristics were experimentally studied; the sensitivity was about 0.025 dB/degree in the linear variation range. The harmonic order of TFBGs also affected the transmission spectrum. Leaky mode resonance was observed in the 8th order TFBG, and torsion (or polarization) influenced the spectrum of the 8th order TFBG. Our research represented the theory of line-by-line inscribed TFBGs and provided an inscription guidance for TFBGs.

Quasi-Distributed Temperature Measurement for Hydroelectric Generators Bearings via use of Fiber Bragg Gratings

2014 ◽  
Author(s):  
Uilian José Dreyer ◽  
Erlon Vagner da Silva ◽  
André Biffe de Renzo ◽  
Valmir de Oliveira ◽  
Daniel Rodrigues Pipa ◽  
...  
Keyword(s):  
Temperature Measurement ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings
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