Anomalous thermal dynamics of Bragg gratings inscribed in germanosilicate optical fiber

Rahman, A and Madhav, Venu K and Srinivasan, B and Asokan, S (2009) Anomalous thermal dynamics of Bragg gratings inscribed in germanosilicate optical fiber. In: Optoelectronics And Advanced Materials-Rapid Communications, 3 (1). pp. 17-23.

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Abstract

An interesting, periodic appearance of a new peak has been observed in the reflected spectrum of a Fiber Bragg Grating (FBG) inscribed in a germanosilicate fiber during thermal treatment. The new peak occurs on the longer wavelength side of the spectrum during heating and on the shorter wavelength side during cooling, following an identical reverse dynamics. Comparison with a commercial grating with 99.9% reflectivity shows a similar decay dynamics. It is proposed that the distortion due to simultaneous erasure and thermal expansion of the index modulation profile may be responsible for the observed anomaly. The reported results help us in understanding the thermal behavior of FBGs and provide additional insights into the mechanisms responsible for the photosensitivity in germanosilicate fibers.

Item Type:	Journal Article
Publication:	Optoelectronics And Advanced Materials-Rapid Communications
Publisher:	National Institute Of Optoelectronics
Additional Information:	Copyright of this article belongs to National Institute Of Optoelectronics.
Keywords:	Fiber Bragg gratings;Thermal erasure;Degradation dynamics.
Department/Centre:	Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics Division of Electrical Sciences > Electrical Engineering
Date Deposited:	09 Jul 2009 06:27
Last Modified:	19 Sep 2010 05:28
URI:	http://eprints.iisc.ac.in/id/eprint/19468

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