Abstract
We demonstrated an in-line micro fiber-optic Fabry-Perot interferometer with an air cavity which was created by multi-step fusion splicing a muti-mode photonic crystal fiber (MPCF) to a standard single mode fiber (SMF). The fringe visibility of the interference pattern was up to 20 dB by reshaping the air cavity. Experimental results showed that such a device could be used as a highly sensitive strain sensor with the sensitivity of 4.5 pm/μɛ. Moreover, it offered some other outstanding advantages, such as the extremely compact structure, easy fabrication, low cost, and high accuracy.
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Fan, R., Hou, Y. & Sun, W. Photonic crystal fiber Fabry-Perot interferometers with high-reflectance internal mirrors. Photonic Sens 5, 97–101 (2015). https://doi.org/10.1007/s13320-015-0234-3
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DOI: https://doi.org/10.1007/s13320-015-0234-3