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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 37, Iss. 1 — Jan. 1, 2012
  • pp: 67–69

Refractive index sensor using microfiber-based Mach–Zehnder interferometer

Jianghai Wo, Guanghui Wang, Ying Cui, Qizhen Sun, Ruibing Liang, Perry Ping Shum, and Deming Liu  »View Author Affiliations


Optics Letters, Vol. 37, Issue 1, pp. 67-69 (2012)
http://dx.doi.org/10.1364/OL.37.000067


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Abstract

A simple and robust refractive index (RI) sensor based on a Mach–Zehnder interferometer has been demonstrated. A section of optical microfiber drawn from silica fiber is employed as the sensing arm. Because of the evanescent field, a slight change of the ambient RI will lead to the variation of the microfiber propagation constant, which will further change the optical length. In order to compensate the variation of the optical length difference, a tunable optical delay line (ODL) is inserted into the other arm. By measuring the delay of the ODL, the ambient RI can be simply demodulated. A high RI sensitivity of about 7159μm/refractive index unit is achieved at microfiber diameter of 2.0 μm.

© 2012 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(230.3990) Optical devices : Micro-optical devices

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: September 9, 2011
Revised Manuscript: November 4, 2011
Manuscript Accepted: November 15, 2011
Published: December 24, 2011

Citation
Jianghai Wo, Guanghui Wang, Ying Cui, Qizhen Sun, Ruibing Liang, Perry Ping Shum, and Deming Liu, "Refractive index sensor using microfiber-based Mach–Zehnder interferometer," Opt. Lett. 37, 67-69 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-1-67


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