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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 11 — Apr. 10, 2011
  • pp: 1548–1553

Refractive index sensing based on Mach–Zehnder interferometer formed by three cascaded single-mode fiber tapers

Di Wu, Tao Zhu, Ming Deng, De-Wen Duan, Lei-Lei Shi, Jun Yao, and Yun-Jiang Rao  »View Author Affiliations


Applied Optics, Vol. 50, Issue 11, pp. 1548-1553 (2011)
http://dx.doi.org/10.1364/AO.50.001548


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Abstract

We report a highly sensitive refractive index (RI) sensor based on three cascaded single-mode fiber tapers, in which a weak taper is sandwiched between the two tapers to improve the sensitivity of the sensor. Experimental results show that the sensitivity of the device is 0.286 nm for a 0.01 RI change, which is about four times higher than that of the normal two-cascaded-taper-based Mach–Zehnder interferometer. In addition, the sensitivity of the device could be enhanced by tapering a longer and thinner middle weak taper. Such kinds of low-cost and highly sensitive fiber-optic RI sensors would find applications in chemical or biochemical sensing fields.

© 2011 Optical Society of America

OCIS Codes
(060.2300) Fiber optics and optical communications : Fiber measurements
(060.2430) Fiber optics and optical communications : Fibers, single-mode
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(280.5715) Remote sensing and sensors : Refractivity profiles

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: November 11, 2010
Revised Manuscript: February 10, 2011
Manuscript Accepted: February 10, 2011
Published: April 4, 2011

Virtual Issues
Vol. 6, Iss. 5 Virtual Journal for Biomedical Optics

Citation
Di Wu, Tao Zhu, Ming Deng, De-Wen Duan, Lei-Lei Shi, Jun Yao, and Yun-Jiang Rao, "Refractive index sensing based on Mach–Zehnder interferometer formed by three cascaded single-mode fiber tapers," Appl. Opt. 50, 1548-1553 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-11-1548

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