Abstract

A semicircular fiber (SCF) was fabricated by flame-heated treatment for displacement sensing application. By launching a laser beam into the SCF, interference was created at the output port of the structure due to fiber-bending-induced birefringence. Experiments indicate that the resonant wavelength was shifted to shorter wavelengths with increasing transverse displacement. Displacement sensitivity increases with the decrease of the bending radius of the SCF. A high sensitivity of 1100nm/mm was obtained for the SCF with a bending radius of 0.57 mm.

© 2012 Optical Society of America

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[CrossRef]

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[CrossRef]

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[CrossRef]

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[CrossRef]

IEEE Photon. Technol. Lett.

O. Frazão, J. L. Santos, and J. M. Baptista, IEEE Photon. Technol. Lett. 19, 1260 (2007).
[CrossRef]

O. Frazão, C. Jesus, J. M. Baptista, J. L. Santos, and P. Roy, IEEE Photon. Technol. Lett. 21, 1277 (2009).
[CrossRef]

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J. Opt.

P. F. Wang, G. Brambilla, Y. Semenova, Q. Wu, and G. Farrell, J. Opt. 13, 075402 (2011).
[CrossRef]

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P. F. Wang, Y. Semenova, Q. Wu, and G. Farrell, Microw. Opt. Technol. Lett. 52, 2231 (2010).
[CrossRef]

Opt. Express

Opt. Lett.

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Figures (4)

Fig. 1.
Fig. 1.

Schematic of (a) experimental setup; (b) fabrication of an SCF; and (c) illustration of the fabricated SCF. BBS, broadband light source; OSA, optical spectrum analyzer; MS, microstage; and SMF, single-mode fiber.

Fig. 2.
Fig. 2.

Transmission spectra of the SCF with different bending radii. Inset: microscopic images of the middle section of the SCF with bending radii R=1.56, 1.19, and 0.99 mm.

Fig. 3.
Fig. 3.

Transmission spectra of the SCF with R=0.99mm versus different amounts of displacement Δl applied on the left extremity of the SCF. The inset shows the schematic of the changing Δl.

Fig. 4.
Fig. 4.

Resonant wavelength λres of dip A versus displacement Δl for the SCF with R=0.99mm.

Equations (3)

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Φ=2π(nsnf)L/λvac,
λres=2(nsnf)L/(2m+1),
βb=0.25kn3(p11p12)(1+v)R2r2,

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