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Proceedings Paper

Superhigh temperature sensitivity of long-period gratings in B/Ge codoped fiber
Author(s): Xuewen Shu; Bashir A.L. Gwandu; Lin Zhang; Ian Bennion
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Paper Abstract

Long period fiber grating (LPFG) can be used as active gain controlling device in EDFA. However, LPFGs fabricated in the standard telecom fiber only have a typical temperature sensitivity of 3-10nm/100 degree(s)C, which may not be sufficient for implementing tuneable filters capable of wide tuning range and high tuning efficiency. In this paper, we report a theoretical and experimental investigation of thermal properties of LPFGs fabricated in B/Ge co-doped optical fiber. We have found that the temperature sensitivity of the LPFGs in the B/Ge fiber is considerably increased compared with those produced in the standard fiber. The LPFGs written in the B/Ge fiber have achieved, on average, one order of magnitude higher sensitivity than that of the LPFGs produced in the standard telecom fiber. We have also identified that the thermal response of LPFG is strongly dependent on the order of the coupled resonant cladding mode. The maximum sensitivity of 1.75nm/ degree(s)C achieved by the 10th cladding mode of the 240micrometers LPFG is nearly 24 times that of the minimum value (0.075nm/C) exhibited by the 30th mode of the 34micrometers LPFG. Such devices may lead to high-efficiency and low-cost thermal/electrical tunable loss filters or sensors with extremely high temperature resolution.

Paper Details

Date Published: 5 April 2002
PDF: 5 pages
Proc. SPIE 4645, Rare-Earth-Doped Materials and Devices VI, (5 April 2002); doi: 10.1117/12.461657
Show Author Affiliations
Xuewen Shu, Aston Univ. (United Kingdom)
Bashir A.L. Gwandu, Aston Univ. (United Kingdom)
Lin Zhang, Aston Univ. (United Kingdom)
Ian Bennion, Aston Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 4645:
Rare-Earth-Doped Materials and Devices VI
Shibin Jiang; Robert W. Keys, Editor(s)

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