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22 April 2006 Modal interferometer made of microstructured optical fibre for multiparameter sensing
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The fabrication of a compact all-fibre modal interferometer that can be used to sense different parameters is reported. The device consists of a tapered large-mode-area microstructured optical fibre with collapsed air holes over a localized region. The tapering is carried out by slowly elongating the fibre while it is heated with a high-temperature oscillating flame torch. This non adiabatic method allows the collapsing of the air holes and transforms a section of the microstructured fibre into a solid one. As a consequence the fundamental HE11 mode is coupled to the HE1m cladding modes which can beat or interfere. This makes the transmission of the device versus the wavelength to exhibit an oscillatory pattern. Such a pattern shifts with strain, high temperature, or refractive index. The device is compact, can operate in a broad range of wavelengths, and can be fabricated in a few minutes which makes it attractive for optical sensing.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Joel Villatoro, Vladimir P. Minkovich, D. Monzón-Hernández, and G. Badenes "Modal interferometer made of microstructured optical fibre for multiparameter sensing", Proc. SPIE 6189, Optical Sensing II, 618906 (22 April 2006);

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