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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 12 — Apr. 20, 2003
  • pp: 2188–2197

Analysis of thermal decay and prediction of operational lifetime for a type I boron-germanium codoped Fiber Bragg grating

Suchandan Pal, Jharna Mandal, Tong Sun, and Kenneth T. V. Grattan  »View Author Affiliations


Applied Optics, Vol. 42, Issue 12, pp. 2188-2197 (2003)
http://dx.doi.org/10.1364/AO.42.002188


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Abstract

The thermal decay of a type I fiber Bragg grating written at 248 nm in boron-germanium codoped silica fiber was examined in terms of its reflectivity and Bragg wavelength change. In addition to the decay in reflectivity, which was observed, a shift in Bragg wavelength over the temperature range considered was seen. A mechanism for the decay in the reflectivity was developed and modeled according to a power law, and the results were compared with those from the aging curve approach. The wavelength shift was simulated by modification of the power law, which was also found to fit well to the experimental data. Temperature-induced reversible and irreversible changes in the grating characteristics were observed and considered to be a means to predict the working lifetime of the grating at comparatively low temperatures. Accelerated aging was also reviewed and compared in terms of reflectivity and Bragg wavelength shift. It was shown that the temperature-induced irreversible shift in the Bragg wavelengths could not be predicted by use of the isothermal decay of the refractive-index modulation. The results were discussed within the framework of the current theoretical approaches for predicting the stability of gratings of this type.

© 2003 Optical Society of America

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.6780) Instrumentation, measurement, and metrology : Temperature
(140.0140) Lasers and laser optics : Lasers and laser optics

History
Original Manuscript: July 4, 2002
Revised Manuscript: November 27, 2002
Published: April 20, 2003

Citation
Suchandan Pal, Jharna Mandal, Tong Sun, and Kenneth T. V. Grattan, "Analysis of thermal decay and prediction of operational lifetime for a type I boron-germanium codoped Fiber Bragg grating," Appl. Opt. 42, 2188-2197 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-12-2188


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