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

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5 Author(s)
Xuewen Shu ; Photonics Res. Group, Aston Univ., Birmingham, UK ; Allsop, T. ; Gwandu, B. ; Lin Zhang
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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/spl deg/C change in temperature for an LPFG with 240-μm period, demonstrating a first ever reported high sensitivity of 2.75 nm//spl deg/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.

Published in:

Photonics Technology Letters, IEEE  (Volume:13 ,  Issue: 8 )