Enhanced FBG Temperature Sensitivity in PbS-Doped Silica Optical Fiber
We demonstrate a novel fiber Bragg grating (FBG) temperature sensor based on lead sulfide (PbS)-doped silica optical fiber, prepared by atomic layer deposition (ALD) doping technique. The FBGs are fabricated using the phase mask method, without hydrogen loading. The temperature sensitivity of the FB...
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Veröffentlicht in: | Journal of lightwave technology 2019-09, Vol.37 (18), p.4902-4907 |
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Sprache: | eng |
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Zusammenfassung: | We demonstrate a novel fiber Bragg grating (FBG) temperature sensor based on lead sulfide (PbS)-doped silica optical fiber, prepared by atomic layer deposition (ALD) doping technique. The FBGs are fabricated using the phase mask method, without hydrogen loading. The temperature sensitivity of the FBG-PbS is found to be \sim19 pm/^\circC within 20-150 ^\circC, showing great linearity and repeatability. It is increased by approximately 60% compared to the temperature sensitivity of FBG in standard single mode fiber (SMF). Furthermore, the temperature characteristics of PbS-doped silica optical fiber are investigated. The thermal expansion coefficient and thermal-optic coefficient of PbS-doped silica fiber are 6.3 \times\; 10^{-7} and 1.23 \times\; 10^{-5}/^\circC, respectively. Moreover, the thermal-optic coefficient value of the PbS-doped silica optical fiber is nearly one order of magnitude higher than that of SMF. Therefore, the FBG based on PbS-doped silica optical fiber appears to be very attractive for the temperature sensing fields. |
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ISSN: | 0733-8724 1558-2213 |
DOI: | 10.1109/JLT.2019.2937138 |