25 September 2013 Phase-shift formed in a tapered long period fiber grating and its application to simultaneous measurements of temperature and refractive-index
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Abstract
A novel approach to calibrate a phase-shift formed in a long-period fiber grating (LPG) is proposed and successfully demonstrated, which is based on the use of either a power- or a wavelength-interrogation technique to the loss-peak existed in the transmission spectrum of the phase-shifted LPG. Moreover, in this study, by tapering a LPG with CO2 laser, phase-shift is successfully created at central part of the LPG. Finally, base on the use of this kind of phase-shifted LPG, a simultaneous measurement for the temperature and the surrounding refractive index has been proposed and experimentally demonstrated.
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Keisuke Hishiki, Hongpu Li, "Phase-shift formed in a tapered long period fiber grating and its application to simultaneous measurements of temperature and refractive-index", Proc. SPIE 8847, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications VII, 88470O (25 September 2013); doi: 10.1117/12.2021684; https://doi.org/10.1117/12.2021684
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