In-fiber Fabry Perot interferometer with narrow interference fringes for enhanced sensitivity in elastic wave detection

•Matched in-fiber Fabry-Perot interferometer (FPI) are employed for sensitivity enhancement towards elastic wave detection.•Free spectral range (FSR) of the FPI is an important parameter in controlling the sensitivity of the fiber sensor.•FPI sensor with an FSR of 34pm and 83pm were designed and the...

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Veröffentlicht in:Optical fiber technology 2019-12, Vol.53, p.102021, Article 102021
Hauptverfasser: Zaini, Muhammad Khairol Annuar, Lee, Yen-Sian, Ismail, Nurazima, Lim, Kok-Sing, Udos, Waldo, Zohari, Mohd Hafizi, Yang, Hang-Zhou, Ahmad, Harith
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Sprache:eng
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Zusammenfassung:•Matched in-fiber Fabry-Perot interferometer (FPI) are employed for sensitivity enhancement towards elastic wave detection.•Free spectral range (FSR) of the FPI is an important parameter in controlling the sensitivity of the fiber sensor.•FPI sensor with an FSR of 34pm and 83pm were designed and their performance were compared. In this work, we have demonstrated using a pair of in-fiber Fabry-Perot interferometer (FPI) with matched Bragg wavelength and free spectral range (FSR) for elastic wave detection based on matched filter interrogation configuration. The cavity lengths of the FPI structures are deliberately made long to achieve small FSR to enhance their sensitivity to elastic wave pressure. It is found that the sensitivity of sensor to elastic wave pressure is linearly proportional to the FPI cavity length. This finding is in agreement with the theoretical analysis.
ISSN:1068-5200
1095-9912
DOI:10.1016/j.yofte.2019.102021