Cryogenic Temperature Response of Reflection-Based Phase-Shifted Long-Period Fiber Gratings

In this study, we investigated the temperature behavior of phase-shifted long-period fiber gratings (PS-LPFGs) inscribed in two types of optical fiber: B/Ge and SMF28. The experiments were carried out from 5 to 305 K using a superconducting quantum interference device magnetometer. The average tempe...

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Bibliographic Details
Published in:Journal of lightwave technology 2015-06, Vol.33 (12), p.2511-2517
Main Authors: Martins, Raquel, Caldas, Paulo, Teixeira, Bruno, Azevedo, Joao, Monteiro, Jose, Belo, Joao H., Araujo, Joao P., Santos, Jose L., Rego, Gaspar
Format: Article
Language:English
Subjects:
Climate
Cryogenic temperature
cryogenic temperatures
Cryogenics
Diffraction gratings
Fiber gratings
Fibers
Germanium
Gratings (spectra)
Long-period fiber grating
optical fiber sensor
Optical fiber sensors
Optical fibers
Reflection
Sensitivity
SQUIDs
Temperature sensors
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Summary:In this study, we investigated the temperature behavior of phase-shifted long-period fiber gratings (PS-LPFGs) inscribed in two types of optical fiber: B/Ge and SMF28. The experiments were carried out from 5 to 305 K using a superconducting quantum interference device magnetometer. The average temperature sensitivity obtained of -0.43 nm/K for PS-LPFGs inscribed in the B/Ge fiber is one order of magnitude larger than for PS-LPFGs inscribed in the SMF28 fiber, in the 60-240 K range. Values ranging from -0.08 nm/K up to 0.2 nm/K were obtained in the 5-35 K temperature range, which are considerably better than previous results achieved for metal-coated FBGs and also for LPFGs inscribed in a similar B/Ge codoped fiber. Nevertheless, further work is required in order to correctly address sensor reliability.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2014.2381236