Bending and Strain Sensitivities in a Helicoidal Long-Period Fiber Gratings

Author

Jung, Hojoong ; Shin, Woojin ; Kim, Jun Ki ; Park, Seung-Han ; Ko, Do-Kyeong ; Lee, Jongmin ; Oh, Kyunghwan

Author_Institution

Inst. of Phys. & Appl. Phys., Yonsei Univ., Seoul, South Korea

Volume

21

Issue

17

fYear

2009

Firstpage

1232

Lastpage

1234

Abstract

In this letter, we report bending and strain sensitivities of helicoidal long-period fiber gratings fabricated by twisting single-mode fibers during CO₂ laser irradiation. Linear spectral shifts of the resonant wavelengths under the bending and tensile strain were observed with the sensitivities of -11.7 nm/m^-1 and -1.1 pm/muepsiv, respectively. The corresponding transmission power variations at the resonance wavelength were 4.1 dB/m^-1 and 2.2 times 10^-4 dB/muepsiv, respectively. Detailed measurement techniques and sensor applications are discussed.

Keywords

bending; diffraction gratings; fibre optic sensors; optical fibre fabrication; strain sensors; CO₂; CO₂ laser irradiation; bending sensitivity; helicoidal long-period fiber gratings; linear spectral shifts; resonant wavelength; single-mode fibers; strain sensitivity; transmission power; $hbox{CO}_{2}$ laser; Bending sensor; fiber sensor; helicoidal long-period fiber gratings (HLPGs); strain sensor;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2009.2024646

Filename

5071284