Cascaded tilted fiber Bragg grating for enhanced refractive index sensing Project supported by the National Natural Science Foundation of China (Grant Nos. 61775182 and 61505165) and Marie Skłodowska-Curie Individual Fellowships in the European Union's Horizon 2020 Research and Innovation Programme (Grant No. 660648)

We proposed and experimentally demonstrated a cascaded tilted fiber Bragg grating (TFBG) for enhanced refractive index sensing. The TFBG is UV-inscribed in series in ordinary single-mode fiber (SMF) and reduced-diameter SMF with the same tilt angle, and then excites two sets of superposed spectral c...

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Bibliographic Details
Published in:Chinese physics B 2018-11, Vol.27 (11)
Main Authors: Jiang, Biqiang, Bi, Zhixuan, Wang, Shouheng, Xi, Teli, Zhou, Kaiming, Zhang, Lin, Zhao, Jianlin
Format: Article
Language:English
Subjects:
fiber optics sensors
refractive index measurement
tilted fiber Bragg grating
Online Access:Get full text
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Summary:We proposed and experimentally demonstrated a cascaded tilted fiber Bragg grating (TFBG) for enhanced refractive index sensing. The TFBG is UV-inscribed in series in ordinary single-mode fiber (SMF) and reduced-diameter SMF with the same tilt angle, and then excites two sets of superposed spectral combs of cladding modes. The cascaded TFBG with total length of 18 mm has a much wider wavelength range over 100 nm and narrower wavelength separation than that of a TFBG only in the SMF, enabling an enlarged range and a higher accuracy of refractive index measurement. The fabricated TFBG with the merits of enhanced sensing capability and temperature self-calibration presents great potentials in the biochemical sensing applications.
ISSN:1674-1056
DOI:10.1088/1674-1056/27/11/114220