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Journal of the Optical Society of Korea

Journal of the Optical Society of Korea

| PUBLISHED BY THE OPTICAL SOCIETY OF KOREA

  • Vol. 6, Iss. 1 — Mar. 30, 2002
  • pp: 5–12

High-Resolution Interrogation Technique for Fiber Bragg crating Sensor Using Long-Period Fiber Grating Pair and Erbium-Doped fiber

Jae-Hoon Jung, Yong-Wook Lee, and Byoung-Ho Lee  »View Author Affiliations


Journal of the Optical Society of Korea, Vol. 6, Issue 1, pp. 5-12 (2002)


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Abstract

A novel interrogation scheme to detect fine Bragg wavelength shift using a long period fiber grating pair with erbium-doped fiber inserted between the two gratings is reported. The technique is shown to feature high resolution and much more immunity to temperature perturbation compared to the conventioned Mach-Zehnder interferometer demodulation system. For quasi-static strain measurement, this approach provides high wavelength resolution of 0.05 pm that corresponds to 41.7 ne in strain and <TEX>$3.8 <TEX>$\times$</TEX> 10^{-3}$</TEX><TEX>$^{\circ}C$</TEX> in temperature. This interrogation system is also employed in dynamic measurement to obtain the minimum detectable strain perturbation of ~ 8.76 ne/H <TEX>$z^{{\frac}{1}{2}}$</TEX> at 100 Hz. Moreover, this interrogation system has prominent thermal stability. This thermal stability comes from the fact that two arms of the interferometer, the core and cladding in erbium-doped fiber, are exposed to nearly the same environment .

© 2002 Optical Society of Korea

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(060.2410) Fiber optics and optical communications : Fibers, erbium

History
Original Manuscript: October 12, 2001
Published: March 1, 2002

Citation
Jae-Hoon Jung, Yong-Wook Lee, and Byoung-Ho Lee, "High-Resolution Interrogation Technique for Fiber Bragg crating Sensor Using Long-Period Fiber Grating Pair and Erbium-Doped fiber," J. Opt. Soc. Korea 6, 5-12 (2002)
http://www.opticsinfobase.org/josk/abstract.cfm?URI=josk-6-1-5


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