Cascaded tilted fiber Bragg grating for enhanced refractive index sensing

Biqiang Jiang*, Zhixuan Bi, Shouheng Wang, Teli Xi, Kaiming Zhou, Lin Zhang, Jianlin Zhao

*Corresponding author for this work

Research output: Contribution to journalArticle


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.

Original languageEnglish
Article number114220
JournalChinese Physics B
Issue number11
Early online date8 Oct 2018
Publication statusE-pub ahead of print - 8 Oct 2018



  • Fiber optics sensors
  • Refractive index measurement
  • Tilted fiber Bragg grating

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