Abstract

We propose and experimentally demonstrate a simple and flexible scheme for the simultaneous measurement of strain and temperature using long-period fiber gratings (LPFGs) based on versatile holey fibers (HFs) with different air-hole sizes. The strongly resonant LPFGs (as much as 24dB) can be successfully achieved. The LPFGs inscribed in the HFs have similar temperature sensitivities regardless of air-hole size because of the same material composition. The strain sensitivities of the LPFGs, however, are different, since holey fibers have different cross-sectional areas depending on the air-hole size. The strain sensitivities of the HF-based LPFGs are enhanced by a factor larger than 2 as the air-hole size increases.

© 2007 Optical Society of America

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1996

A. M. Vengsarkar, P. J. Lemaire, J. B. Judkins, V. Bhatia, T. Erdogan, and J. E. Sipe, J. Lightwave Technol. 14, 58 (1996).
[CrossRef]

S. W. James, M. L. Dockney, and R. P. Tatam, Electron. Lett. 32, 1133 (1996).
[CrossRef]

Electron. Lett.

S. W. James, M. L. Dockney, and R. P. Tatam, Electron. Lett. 32, 1133 (1996).
[CrossRef]

J. Lightwave Technol.

A. M. Vengsarkar, P. J. Lemaire, J. B. Judkins, V. Bhatia, T. Erdogan, and J. E. Sipe, J. Lightwave Technol. 14, 58 (1996).
[CrossRef]

Opt. Commun.

H. Dobb, K. Kalli, and D. J. Webb, Opt. Commun. 260, 184 (2006).
[CrossRef]

Opt. Express

Opt. Lett.

Other

G. H. Kim, Y. G. Han, H. S. Cho, S. H. Kim, S. B. Lee, K. S. Lee, C. H. Jeong, C. H. Oh, and H. J. Kang, in Optical Fiber Communication Conference and Exposition and The National Fiber Optic Engineers Conference, Technical Digest (CD) (Optical Society of America, 2006), paper OW12.
[PubMed]

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Figures (4)

Fig. 1
Fig. 1

(a) Transmission characteristics of LPFGs inscribed in HFs with various air-hole sizes. Experimental setup for measurement of temperature (b) and strain sensitivities (c) of LPFGs. The scanning electron microscopy (SEM) images of the cross-section of HFs for fabrication of LPFGs were shown in the inset of Fig. 1a.

Fig. 2
Fig. 2

(a) Spectral response of the three HF-based LPFGs to the applied temperature change and (b) the center wavelength shift of the HF-based LPFGs as a function of the applied temperature.

Fig. 3
Fig. 3

Long-term stability of the HF-based LPFGs. The variation of the optical power (a) and center wavelength of three HF-based LPFGs for 24 h at 150 ° C .

Fig. 4
Fig. 4

Spectral response of the three HF-based LPFGs to the applied strain change: (a) HF1-based LPFG1, (b) HF2-based LPFG2, and (c) HF3-based LPFG3. (d) The center wavelength shift of the three HF-based LPFGs as a function of the applied strain.

Equations (2)

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d λ p d T = d λ p d ( Δ n ) ( d n core d T d n clad m d T ) + Λ d λ p d Λ 1 L d L d T ,
d λ p d ε = d λ p d ( Δ n ) ( d n core d ε d n clad m d ε ) + Λ d λ p d Λ ,

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