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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 19 — Jul. 1, 2003
  • pp: 3766–3771

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

Thomas Allsop, Ron Neal, Domenico Giannone, David J. Webb, Des J. Mapps, and Ian Bennion  »View Author Affiliations


Applied Optics, Vol. 42, Issue 19, pp. 3766-3771 (2003)
http://dx.doi.org/10.1364/AO.42.003766


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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.

© 2003 Optical Society of America

OCIS Codes
(060.2310) Fiber optics and optical communications : Fiber optics
(060.2370) Fiber optics and optical communications : Fiber optics sensors

History
Original Manuscript: July 26, 2002
Published: July 1, 2003

Citation
Thomas Allsop, Ron Neal, Domenico Giannone, David J. Webb, Des J. Mapps, and Ian Bennion, "Sensing characteristics of a novel two-section long-period grating," Appl. Opt. 42, 3766-3771 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-19-3766


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