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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 14 — Jul. 2, 2012
  • pp: 15406–15417

Polarization-dependent curvature sensor based on an in-fiber Mach-Zehnder interferometer with a difference arithmetic demodulation method

Changyu Shen, Chuan Zhong, Yang You, Jinlei Chu, Xin Zou, Xinyong Dong, Yongxing Jin, Jianfeng Wang, and Huaping Gong  »View Author Affiliations


Optics Express, Vol. 20, Issue 14, pp. 15406-15417 (2012)
http://dx.doi.org/10.1364/OE.20.015406


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Abstract

A curvature sensor based on a polarization-dependent in-fiber Mach-Zehnder interferometer (MZI) is proposed. The MZI is fabricated by core-offset fusion splicing one section of polarization maintaining fiber (PMF) between two single mode fibers (SMFs). Two independent interference patterns corresponding to the two orthogonal polarization modes for the PMF are obtained. The couple efficiency between the core mode and the cladding mode decreased with the increasing of the bending on the MZI part. The curvature variation on the MZI part can be obtained by detecting the fringe visibility of the interference patterns. A difference arithmetic demodulation method is used to reduce the effects of the light source power fluctuations and temperature cross-sensitivity. Experimental results show that maximal sensitivity of −0.882 dB/m−1 is obtained under a measurement range of 0.1 to 0.35 m−1 for the curvature sensor. With the use of difference arithmetic demodulation method, the temperature-curvature cross-sensitivity and light source power fluctuations effects on the proposed sensor are decreased by 94% and 91%, respectively.

© 2012 OSA

OCIS Codes
(060.2340) Fiber optics and optical communications : Fiber optics components
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(060.2420) Fiber optics and optical communications : Fibers, polarization-maintaining
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Sensors

History
Original Manuscript: May 14, 2012
Revised Manuscript: June 16, 2012
Manuscript Accepted: June 21, 2012
Published: June 25, 2012

Citation
Changyu Shen, Chuan Zhong, Yang You, Jinlei Chu, Xin Zou, Xinyong Dong, Yongxing Jin, Jianfeng Wang, and Huaping Gong, "Polarization-dependent curvature sensor based on an in-fiber Mach-Zehnder interferometer with a difference arithmetic demodulation method," Opt. Express 20, 15406-15417 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-14-15406


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