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Chin. Phys. B, 2018, Vol. 27(11): 114220    DOI: 10.1088/1674-1056/27/11/114220
Special Issue: SPECIAL TOPIC — 80th Anniversary of Northwestern Polytechnical University (NPU)
SPECIAL TOPIC—80th Anniversary of Northwestern Polytechnical University (NPU) Prev   Next  

Cascaded tilted fiber Bragg grating for enhanced refractive index sensing

Biqiang Jiang(姜碧强)1,2, Zhixuan Bi(毕芷瑄)1, Shouheng Wang(王守恒)1, Teli Xi(席特立)1, Kaiming Zhou2, Lin Zhang2, Jianlin Zhao(赵建林)1
1 MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi'an 710072, China;
2 Aston Institute of Photonic Technologies, Aston University, Birmingham B4 7ET, UK

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.

Keywords:  tilted fiber Bragg grating      fiber optics sensors      refractive index measurement  
Received:  17 July 2018      Revised:  02 September 2018      Published:  05 November 2018
PACS:  42.81.Pa (Sensors, gyros)  
  42.79.-e (Optical elements, devices, and systems)  
  42.81.Qb (Fiber waveguides, couplers, and arrays)  
  42.81.-i (Fiber optics)  

Project supported by the National Natural Science Foundation of China (Grant Nos. 61775182 and 61505165) and Marie Sklodowska-Curie Individual Fellowships in the European Union's Horizon 2020 Research and Innovation Programme (Grant No. 660648).

Corresponding Authors:  Biqiang Jiang     E-mail:

Cite this article: 

Biqiang Jiang(姜碧强), Zhixuan Bi(毕芷瑄), Shouheng Wang(王守恒), Teli Xi(席特立), Kaiming Zhou, Lin Zhang, Jianlin Zhao(赵建林) Cascaded tilted fiber Bragg grating for enhanced refractive index sensing 2018 Chin. Phys. B 27 114220

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