Sensing characteristics of a novel two-section long-period grating

Allsop, Thomas D.P.; Neal, Ron; Giannone, Domenico; Webb, David J.; Mapps, Des J. and Bennion, Ian (2003). Sensing characteristics of a novel two-section long-period grating. Applied optics, 42 (19), pp. 3766-3771.

Abstract

The behavior of a temperature self-compensating, fiber, long-period grating (LPG) device is studied. This device consists of a single 325-µm-period LPG recorded across two sections of a single-mode B-Ge-codoped fiber—one section bare and the other coated with a 1-µm thickness of Ag. This structure generates two attenuation bands associated with the eighth and ninth cladding modes, which are spectrally close together (~60 nm). The attenuation band associated with the Ag-coated section is unaffected by changes in the refractive index of the surrounding medium and can be used to compensate for the temperature of the bare-fiber section. The sensor has a resolution of ±1.0 × 10-3 for the refractive index and ±0.3 °C for the temperature. The effect of bending on the spectral characteristics of the two attenuation bands was found to be nonlinear, with the Ag-coated LPG having the greater sensitivity.

Publication DOI: https://doi.org/10.1364/AO.42.003766
Divisions: Engineering & Applied Sciences > Electrical, electronic & power engineering
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Additional Information: © 2003 Optical Society of America This paper was published in Applied Optics and is made available as an electronic reprint with the permission of OSA. The paper can be http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-19-3766. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
Uncontrolled Keywords: temperature self-compensating fiber,long-period grating,attenuation band,Atomic and Molecular Physics, and Optics
Published Date: 2003-07-01

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