Terahertz Fiber Bragg Grating for Distributed Sensing

Author

Zhen Chen ; Lei Yuan ; Hefferman, Gerald ; Tao Wei

Author_Institution

Dept. of Electr., Comput. & Biomed. Eng., Univ. of Rhode Island, Kingston, RI, USA

Volume

27

Issue

10

fYear

2015

fDate

May15, 15 2015

Firstpage

1084

Lastpage

1087

Abstract

This letter reports a fiber Bragg grating (FBG) for distributed sensing applications fabricated using single-mode optical fiber and a femtosecond laser and interrogated in the terahertz (THz) range. A theoretical model of device behavior was derived, which agreed well with experimentally observed device behavior. In order to investigate the utility of THZ FBGs (THz FBGs) as a sensing modality, temperature tests were conducted. The results demonstrated a sensitivity of -1.32 GHz/°C and a detection resolution of <;0.0017 °C. A temperature distribution test was also conducted using a THz FBG, demonstrating its potential as a distributed sensing platform with high spatial resolution. The feasibility of interrogating THz FBGs using narrow interrogation bandwidths was also experimentally shown.

Keywords

Bragg gratings; fibre optic sensors; optical fibre fabrication; optical fibre testing; temperature distribution; terahertz wave detectors; THz FBG; detection resolution; device behavior; distributed sensing platform; femtosecond laser; interrogation bandwidths; sensing modality; single-mode optical fiber fabrication; temperature distribution test; terahertz fiber Bragg grating; theoretical model; Bandwidth; Fiber gratings; Optical fiber sensors; Optical fibers; Temperature sensors; Interferometry; interferometry; optical fiber sensor;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2015.2407580

Filename

7055324