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Communication

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

by 1,2,†, 1,3,†, 1,3, 1,2,3, 1,2,3 and 1,2,3,*
1
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
2
State Key Laboratory of Pulsed Power Laser Technology, Changsha 410073, China
3
Hunan Provincial Key Laboratory of High Energy Laser Technology, Changsha 410073, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Oleg G. Morozov
Sensors 2021, 21(18), 6237; https://doi.org/10.3390/s21186237
Received: 20 August 2021 / Revised: 12 September 2021 / Accepted: 14 September 2021 / Published: 17 September 2021
(This article belongs to the Special Issue Fiber Bragg Grating Sensors: Recent Advances and Future Perspectives)
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. View Full-Text
Keywords: femtosecond laser; direct writing; tilted fiber Bragg gratings femtosecond laser; direct writing; tilted fiber Bragg gratings
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MDPI and ACS Style

Li, H.; Zhao, X.; Rao, B.; Wang, M.; Wu, B.; Wang, Z. Fabrication and Characterization of Line-by-Line Inscribed Tilted Fiber Bragg Gratings Using Femtosecond Laser. Sensors 2021, 21, 6237. https://doi.org/10.3390/s21186237

AMA Style

Li H, Zhao X, Rao B, Wang M, Wu B, Wang Z. Fabrication and Characterization of Line-by-Line Inscribed Tilted Fiber Bragg Gratings Using Femtosecond Laser. Sensors. 2021; 21(18):6237. https://doi.org/10.3390/s21186237

Chicago/Turabian Style

Li, Hongye, Xiaofan Zhao, Binyu Rao, Meng Wang, Baiyi Wu, and Zefeng Wang. 2021. "Fabrication and Characterization of Line-by-Line Inscribed Tilted Fiber Bragg Gratings Using Femtosecond Laser" Sensors 21, no. 18: 6237. https://doi.org/10.3390/s21186237

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