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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 10 — May. 7, 2012
  • pp: 11109–11120

All-fiber Mach-Zehnder interferometers for sensing applications

Lecheng Li, Li Xia, Zhenhai Xie, and Deming Liu  »View Author Affiliations


Optics Express, Vol. 20, Issue 10, pp. 11109-11120 (2012)
http://dx.doi.org/10.1364/OE.20.011109


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Abstract

We propose and demonstrate a thinned fiber based Mach-Zehnder interferometer for multi-purpose sensing applications. The sensor head is formed by all-fiber in-line singlemode-multimode-thinned-singlemode (SMTS) fiber structure, only using the splicing method. The principle of operation relies on the effect that the thinned fiber cladding modes interference with the core mode by employing a multimode fiber as a mode coupler. Experimental results showed that the liquid refractive index information can be simultaneously provided from measuring the sensitivity of the liquid level. A 9.00 mm long thinned fiber sensor at a wavelength of 1538.7228 nm exhibits a water level sensitivity of −175.8 pm/mm, and refractive index sensitivity as high as −1868.42 (pm/mm)/RIU, respectively. The measuring method is novel, for the first time to our knowledge. In addition, it also demonstrates that by monitoring the wavelength shift, the sensor at a wavelength of 1566.4785 nm exhibits a refractive index sensitivity of −25.2935 nm/RIU, temperature sensitivity of 0.0615 nm/°C, and axial strain sensitivity of −2.99 pm/με, respectively. Moreover, the sensor fabrication process is very simple and cost effective.

© 2012 OSA

OCIS Codes
(060.2310) Fiber optics and optical communications : Fiber optics
(060.2340) Fiber optics and optical communications : Fiber optics components
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Sensors

History
Original Manuscript: March 16, 2012
Revised Manuscript: April 26, 2012
Manuscript Accepted: April 26, 2012
Published: April 30, 2012

Citation
Lecheng Li, Li Xia, Zhenhai Xie, and Deming Liu, "All-fiber Mach-Zehnder interferometers for sensing applications," Opt. Express 20, 11109-11120 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-10-11109


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