Characterization of Fiber Bragg Grating Inscribed in Few-Mode Silica-Germanate Fiber

Author

Tianye Huang ; Songnian Fu ; Changjian Ke ; Shum, Perry Ping ; Deming Liu

Author_Institution

Nat. Eng. Lab. for Next Generation Internet Access Syst., Huazhong Univ. of Sci. & Technol., Wuhan, China

Volume

26

Issue

19

fYear

2014

fDate

Oct.1, 1 2014

Firstpage

1908

Lastpage

1911

Abstract

We present a temperature and strain fiber sensor utilizing fiber Bragg grating (FBG) inscribed in silica-germanate few-mode fiber. The temperature and strain sensitivities of resonant wavelength formed by mode LP01 self-coupling and mode LP₀₁-LP₁₁ cross-coupling are investigated theoretically and characterized experimentally. Two resonant wavelengths demonstrate different temperature sensitivities of 11.5 pm/°C 10.6 pm/°C, respectively, due to different mode profile, while the strain sensitivities are quite similar with a value of 0.9 pm/με. By using FBG character matrix, the proposed fiber sensor can measure those two parameters simultaneously within a compact and cost-effective setup.

Keywords

Bragg gratings; fibre optic sensors; germanium compounds; optical fibre couplers; optical fibre fabrication; optical fibre testing; strain sensors; temperature sensors; FBG character matrix; few-mode silica-germanate fiber; fiber Bragg grating; mode LP01 self-coupling; mode LP₀₁-LP₁₁ cross-coupling; resonant wavelength; strain fiber sensor; temperature fiber sensor; Fiber gratings; Optical fiber sensors; Optical fibers; Strain; Temperature measurement; Temperature sensors; Few-mode fiber (FMF); fiber Brag grating (FBG); fiber sensor;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2014.2341672

Filename

6862840