Abstract

A novel reflective refractometer based on a thin-core fiber (TCF) sandwiched between a leading single-mode fiber (SMF) and a fiber Bragg grating (FBG) imprinted SMF stub was demonstrated. The reflection from the fiber stub occurs in two well-defined wavelength bands, corresponding to the Bragg core mode and cladding modes. The TCF section functions as a tailorable bridge between the FBG core mode reflection and the surrounding refractive index (SRI). Linear response with enhanced sensitivity of 133.26 dB/refractive index unit for temperature-immune SRI measurement within the biologically desirable sensing range of 1.33–1.41 has been achieved via cost-effective power detection.

© 2012 Optical Society of America

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Appl. Opt. (1)

Electron. Lett. (1)

K. Zhou, X. Chen, L. Zhang, and I. Bennion, Electron. Lett. 40, 232 (2004).
[CrossRef]

Fiber Integr. Opt. (1)

A. Asseh, S. Sandgren, H. Ahlfeldt, B. Sahlgren, R. Stubbe, and G. Edwall, Fiber Integr. Opt. 17, 51 (1998).
[CrossRef]

IEEE Photon. Technol. Lett. (1)

T. Guo, C. K. Chen, A. Laronche, and J. Albert, IEEE Photon. Technol. Lett. 20, 635 (2008).
[CrossRef]

J. Lightwave Technol. (3)

J. Opt. (1)

Q. Wu, Y. Semenova, P. F. Wang, and G. Farrell, J. Opt. 13 (2011).

Meas. Sci. Technol. (2)

K. Schroeder, W. Ecke, R. Mueller, R. Willsch, and A. Andreev, Meas. Sci. Technol. 12, 757 (2001).
[CrossRef]

G. Laffont and P. Ferdinand, Meas. Sci. Technol. 12, 765 (2001).
[CrossRef]

Opt. Express (3)

Opt. Lett. (4)

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Figures (6)

Fig. 1.
Fig. 1.

Schematic diagram of the TCF–FBG refractometer.

Fig. 2.
Fig. 2.

(a) Reflection spectrum of a single FBG and (b) reflection spectrum of the TCF–FBG refractometer.

Fig. 3.
Fig. 3.

Experimental setup for SRI measurement.

Fig. 4.
Fig. 4.

Spectral response of core mode reflection versus SRI.

Fig. 5.
Fig. 5.

Normalized peak power of core mode reflection versus SRI. Inset shows its temperature response.

Fig. 6.
Fig. 6.

SRI responses of sensors with different TCF lengths.

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