Journal
CHINESE PHYSICS B
Volume 27, Issue 11, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1674-1056/27/11/114220
Keywords
tilted fiber Bragg grating; fiber optics sensors; refractive index measurement
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Funding
- National Natural Science Foundation of China [61775182, 61505165]
- Marie Sklodowska-Curie Individual Fellowships in the European Union's Horizon 2020 Research and Innovation Programme [660648]
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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.
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