Regenerated Type-IIa Fibre Bragg Grating from a Ge–B codoped fibre via thermal activation

Cheong, Y.K. and Chong, W.Y. and Chong, S.S. and Lim, K.S. and Ahmad, Harith (2014) Regenerated Type-IIa Fibre Bragg Grating from a Ge–B codoped fibre via thermal activation. Optics & Laser Technology, 62. pp. 69-72. ISSN 0030-3992, DOI

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A Type-IIa Regenerated Fibre Bragg Grating (RFBG) was fabricated via a thermal activation process at 600 °C, from a saturated type-I Hydrogenated (Type-IH) seed grating, inscribed in a germanium–boron codoped (Ge–B) fibre. Rarely, dynamics of the induced index change featured a negative index grating, wherein blueshifts of Bragg wavelength were observed during a thermal regeneration process. The Type-IIa RFBG has been tested and verified to be temperature stable upon two different sensing temperature ranges, which are 100–600 °C and 600–1000 °C, separately. For the low temperature range, the RFBG showed no significant hysteresis and demonstrated an excellent repeatability, however, with non-linear temperature responses. For the high temperature range, the RFBG showed linear temperature responses with negligible fluctuations in grating stability. The simple regenerative mechanism opens up a new possibility of realizing low cost and yet highly reproducible and reliable grating-based sensors.

Item Type: Article
Uncontrolled Keywords: Fibre Bragg Grating; Thermal regeneration; High temperature sensing
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Department of Physics
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 26 Oct 2015 00:58
Last Modified: 11 Oct 2018 02:56

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