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- W1998157069 abstract "A Mach–Zehnder interferometer formed in single mode fiber is implemented. The interferometer is built by two mechanically-induced long-period gratings. In addition, a fiber taper in the middle section is inserted. The spectral properties of the whole system are analyzed. Visibility of the interference fringes up to 0.80 (the higher ever reported using mechanically-induced long-period gratings) with fringe spacing in the 4.1 to 0.86 nm range are experimentally demonstrated. The proposed device allows reducing the fiber diameter of the section between gratings with a minimal effect in the interference fringe spacing. The sensitivity of the interferometer to external refractive index changes was also studied. It is experimentally shown that, due to the nature of the cladding mode excited, it is necessary to taper the fiber to improve the system sensitivity to external refractive index. Fiber tapers with different diameter, inserted between the long-period gratings pair were fabricated and tested for measuring external refractive index changes. A maximum resolution of 2.3×10−4 RIU in a refractive index range from 1.36 to 1.402 is achieved." @default.
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- W1998157069 date "2012-07-01" @default.
- W1998157069 modified "2023-10-14" @default.
- W1998157069 title "Tapered Mach–Zehnder interferometer based on two mechanically induced long-period fiber gratings as refractive index sensor" @default.
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- W1998157069 doi "https://doi.org/10.1016/j.optlastec.2011.12.007" @default.
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