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Applied Optics

Applied 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)

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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

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

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)

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  1. L. Y. Shao, A. P. Zhang, W. S. Liu, H. Y. Fu, and S. He, “Optical refractive-index sensor based on dual fiber-Bragg gratings interposed with a multimode-fiber taper,” IEEE Photonics Technol. Lett. 19, 30–32 (2007). [CrossRef]
  2. A. Iadicicco, A. Cusano, A. Cutolo, R. Bernini, and M. Giordano, “Thinned fiber Bragg gratings as high sensitivity refractive index sensor,” IEEE Photonics Technol. Lett. 16, 1149–1151 (2004). [CrossRef]
  3. G. Laffout and P. Ferdinand, “Tilted short-period fibre-Bragg-grating induced coupling to cladding modes for accurate refractometry,” Meas. Sci. Technol. 12, 765–770 (2001). [CrossRef]
  4. X. Shu, B. A. L. Gwandu, Y. Liu, L. Zhang, and I. Bennion, “Sampled fiber Bragg grating for simultaneous refractive-index and temperature measurement,” Opt. Lett. 26, 774–776(2001). [CrossRef]
  5. H. J. Patrick, A. D. Kersey, and F. Bucholtz, “Analysis of the response of long period fiber gratings to external index of refraction,” J. Lightwave Technol. 16, 1606–1612 (1998). [CrossRef]
  6. T. Zhu, Y. J. Rao, and Q. J. Mo, “Simultaneous measurement of refractive index and temperature using a single ultralong-period fiber grating,” IEEE Photonics Technol. Lett. 17, 744 (2005). [CrossRef]
  7. T. Allsop, R. Reeves, D. J. Webb, I. Bennion, and R. Neal, “A high sensitivity refractometer based upon a long period grating Mach–Zehnder interferometer,” Rev. Sci. Instrum. 73, 1702–1705 (2002). [CrossRef]
  8. J. F. Ding, A. P. Zhang, L. Y. Shao, J. H. Yan, and S. He, “Fiber-taper seeded long-period grating pair as a highly sensitive refractive-index sensor,” IEEE Photonics Technol. Lett. 17, 1247–1249 (2005). [CrossRef]
  9. J. Villatoro and D. M. Hernandez, “Low-cost optical fiber refractive index sensor based on core diameter mismatch,” J. Lightwave Technol. 24, 1409–1413 (2006). [CrossRef]
  10. Z. Tian, S. S.-H. Yam, J. Barnes, W. Bock, P. Greig, J. M. Fraser, H.-P. Loock, and R. D. Oleschuk, “Refractive index sensing with Mach–Zehnder interferometer based on concatenating two single mode fiber tapers,” IEEE Photonics Technol. Lett. 20, 626–628 (2008). [CrossRef]
  11. J. Villatoro, D. Monzon-Hernandez, and D. Talavera, “High resolution refractive index sensing with cladding multimode tapered optical fiber,” Electron. Lett. 40, 106–107 (2004). [CrossRef]
  12. T. Wei, X. Lan, and H. Xiao, “Fiber inline core-cladding-mode Mach–Zehnder interferometer fabricated by two-point CO2 laser irradiations,” IEEE Photonics Technol. Lett. 21, 669–671(2009). [CrossRef]
  13. P. L. Swart, “Long-period grating Michelson refractometric sensor,” Meas. Sci. Technol. 15, 1576–1580 (2004). [CrossRef]
  14. Z. Tian, S. S.-H. Yam, and H.-P. Loock, “Refractive index sensor based on an abrupt taper Michelson interferometer in a single-mode fiber,” Opt. Lett. 33, 1105–1107 (2008). [CrossRef] [PubMed]
  15. Z. Tian, S. S.-H. Yam, and H.-P. Loock, “Single-mode fiber refractive index sensor based on core-offset attenuators,” IEEE Photonics Technol. Lett. 20, 1387–1389 (2008). [CrossRef]
  16. Y. Wang, M. Yang, D. N. Wang, S. Liu, and P. Lu, “Fiber in-line Mach–Zehnder interferometer fabricated by femtosecond laser micromachining for refractive index measurement with high sensitivity,” J. Opt. Soc. Am. B 27, 370–374 (2010). [CrossRef]
  17. R. Jha, J. Villatoro, G. Badenes, and V. Pruneri, “Refractometry based on a photonic crystal fiber interferometer,” Opt. Lett. 34, 617–619 (2009). [CrossRef] [PubMed]
  18. L. Fan, W. Jiang, S. Feng, R. Zhao, S. Zheng, H. Li, L. Pei, and S. Jian, “Comb-filter based on in-fiber Mach–Zehnder interferometer using a twin-core fiber,” in 2010 Symposium on Photonics and Optoelectronic (SOPO) (IEEE, 2010), pp. 1–4. [CrossRef]
  19. F. Pang, H. Liu, N. Chen, Y. Liu, X. Zeng, Z. Chen, and T. Wang, “Cladding-mode resonance of a double-cladding fiber at a near modal cut-off wavelength for RI sensing,” Meas. Sci. Technol. 21, 094028 (2010). [CrossRef]
  20. J. D. Love, W. M. Henry, W. J. Stewart, R. J. Black, S. Lacroix, and F. Gonthier, “Tapered single-mode fibres and devices. Part 1. Adiabaticity criteria,” IEE Proc. J 138, 343–354(1991). [CrossRef]
  21. H. Y. Choi, M. J. Kim, and B. H. Lee, “All-fiber Mach–Zehnder type interferometers formed in photonic crystal fiber,” Opt. Express 15, 5711–5720 (2007). [CrossRef] [PubMed]

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