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A. RAHMAN1,* , K. VENU MADHAV1, B. SRINIVASAN2, S. ASOKAN1
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.
Fiber Bragg gratings, Thermal erasure, Degradation dynamics.
A. RAHMAN, K. VENU MADHAV, B. SRINIVASAN, S. ASOKAN, Anomalous thermal dynamics of Bragg gratings inscribed in germanosilicate optical fiber, Optoelectronics and Advanced Materials - Rapid Communications, 3, 1, January 2009, pp.17-23 (2009).
Submitted at: Nov. 21, 2008
Accepted at: Jan. 21, 2009
Optoelectronics and Advanced Materials - Rapid Communications
(2023): 0.5 - 2023 Journal Citation Reports (Clarivate Analytics, 2024)
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