Cascaded tilted fiber Bragg grating for enhanced refractive index sensing

doi:10.1088/1674-1056/27/11/114220

Abstract

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
Accepted manuscript online:

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)

Fund:

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: bqjiang@nwpu.edu.cn

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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