Abstract

We present a novel corrugated long-period fiber grating whose transmission spectra are highly sensitive to the applied tensile strain, torsion,and bending due to the periodical index modulation created and changed by these mechanic forces. The induced index modulation can also be experimentally characterized by using a built-in fiber Bragg grating (FBG). The long period fiber gratings possess the following unique properties when used as sensors. As a tensile strain sensor, its resonance loss varies but resonance wavelength remains stable. As a torsion sensor, the wavelength varies with the applied twist rate. As a bending sensor, the cladding-mode resonance grows with the bending curvature.

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Appl. Opt. (1)

J. Lightwave Technol. (4)

W. F. Liu, P. St. J. Russell and L. Dong, "100% efficient narrow-band acoustooptic tunable reflector using fiber Bragg grating", J. Lightwave Technol., vol. 16, pp. 2006-2009, Nov. 1998.

A. D. Kersey, M. A. Davis, H. J. Patrick, M. LeBlanc, K. P. Koo, C. G. Askins, M. A. Putnam and E. J. Friebele, "Fiber grating sensors", J. Lightwave Technol., vol. 15, pp. 1442-1463, Aug. 1997.

A. M. Vengsarkar, P. J. Lemaire, J. B. Judkins, V. Bhatia, T. Erodogan and J. E. Spie, "Long-period fiber gratings as band-rejection filters", J. Lightwave Technol., vol. 14, pp. 58-65, Jan. 1996.

M. Vaziri and C. L. Chen, "An etched two-mode fiber modal coupling element", J. Lightwave Technol., vol. 15, pp. 474-481, Mar. 1997 .

Opt. Lett. (3)

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