High-temperature sensitivity of long-period gratings in B-Ge codoped fiber

Shu, Xuewen; Allsop, Thomas D.P.; Gwandu, Bashir; Zhang, Lin and Bennion, Ian (2001). High-temperature sensitivity of long-period gratings in B-Ge codoped fiber. IEEE Photonics Technology Letters, 13 (8), pp. 818-820.


We report an investigation of thermal properties of long-period fiber gratings (LPFGs) of various periods fabricated in the conventional B-Ge codoped fiber. It has been found that the temperature sensitivity of the LPFGs produced in the B-Ge fiber can be significantly enhanced as compared with the standard telecom fiber. A total of 27.5-nm spectral shift was achieved from only 10 °C change in temperature for an LPFG with 240-μm period, demonstrating a first ever reported high sensitivity of 2.75 nm/°C. Such an LPFG may lead to high-efficiency and low-cost thermal/electrical tunable loss filters or sensors with extremely high-temperature resolution. The nonlinear thermal response of the supersensitive LPG was also reported and first explained.

Publication DOI: https://doi.org/10.1109/68.935814
Divisions: Engineering & Applied Sciences > Electrical, electronic & power engineering
Engineering & Applied Sciences > Institute of Photonics
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Uncontrolled Keywords: fiber Bragg gratings,long-period fiber grating,photosensitive fibers,temperature sensors,tunable filters,Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics,Physics and Astronomy (miscellaneous)
Published Date: 2001-08


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