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Optics Letters


  • Editor: Alan E. Willner
  • Vol. 38, Iss. 14 — Jul. 15, 2013
  • pp: 2611–2613

Transverse load sensing based on a dual-frequency optoelectronic oscillator

Fanqi Kong, Wangzhe Li, and Jianping Yao  »View Author Affiliations

Optics Letters, Vol. 38, Issue 14, pp. 2611-2613 (2013)

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We propose and experimentally demonstrate a fiber-optic sensor implemented based on a dual-frequency optoelectronic oscillator (OEO) for transverse load sensing. In the OEO loop, a phase-shifted fiber Bragg grating (PS-FBG) is employed to which a transverse load is applied to introduce a birefringence to create two orthogonally polarized notches, which leads to the generation of two oscillating frequencies. The beat frequency between the two oscillating frequencies is a function of the load force applied to the PS-FBG. The proposed sensor is experimentally demonstrated. The sensitivity and the minimal detectable load are measured to be as high as 9.73GHz/(N/mm) and 2.06×104N/mm, respectively. The high-frequency purity and stability of the generated microwave signal by the OEO permit extremely reliable and high-accuracy measurement. The frequency interrogation allows the system to operate at an ultra-high speed. In addition, the sensing signal is insensitive to the variations of both the environmental temperature and the optical carrier wavelength.

© 2013 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(230.4910) Optical devices : Oscillators

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: April 8, 2013
Revised Manuscript: June 20, 2013
Manuscript Accepted: June 20, 2013
Published: July 15, 2013

Fanqi Kong, Wangzhe Li, and Jianping Yao, "Transverse load sensing based on a dual-frequency optoelectronic oscillator," Opt. Lett. 38, 2611-2613 (2013)

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