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Femtosecond laser refractive index modulated multimode fiber for high sensitivity vector bending measurement
Date
2022
Abstract
A femtosecond (fs) laser fabricated refractive index (RI) modulated multimode fiber (MMF) for high sensitivity vector bending measurement is presented. A fs laser-induced local positive RI modulation in the MMF core results in a non-circular symmetric RI distribution of the MMF. Such a RI-modulated MMF used in single-mode-multimode-single-mode (SMS) fiber structure exhibits a bending-dependent spectral shift response. Due to the large core size of the MMF, the RI modulated area can be relatively far away from the fiber core axis, which in turn results in a greater effective RI change during bending. Experimental results show that the highest bending sensitivity of -45.8 nm/m-1 is achieved at 0° orientation with the resonant wavelength of 1554.4 nm. In addition to its high sensitivity and simple structure, this vector bending sensor exhibits ultra-low temperature crosstalk in bending measurements, as low as 0.0002 m-1/°C, which makes it an excellent candidate for accurate vector bending monitoring applications.
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Publisher
IEEE, Institute of Electrical and Electronics Engineers
Citation
Journal of Lightwave Technology, 2022, 40, (19), pp. 6501-6507
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Funding Information
This work was supported by the National Natural Science Foundation of China (NSFC) (61935006, 62090062); Heilongjiang Provincial Natural Science Foundation of China (LH2020F028); Fundamental Research Funds for the Central Universities (3072022TS2504); Shenzhen Basic Research Project (JCYJ20190808173619062); 111 Project to the Harbin Engineering University (B13015); Heilongjiang Touyan Innovation Team Program; China Scholarship Council (202106680007); Science Foundation Ireland under the Centres research program for the MaREI project (SFI/12/RC/2302_P2).