Abstract
We present a compact in-line fiber interferometric sensor fabricated in a boron doped two-mode highly birefringent microstructured fiber using a laser. The intermodal interference arises at the fiber output due to coupling between the fundamental and the first order modes occurring at two fiber tapers distant by a few millimeters. The visibility of intermodal interference fringes is modulated by a polarimetric differential signal and varies in response to measurand changes. The proposed interferometer was tested for measurements of the strain and temperature, respectively, in the range of and . The sensitivity coefficients corresponding to fringe displacement and contrast variations are equal respectively for strain and and for temperature and . This allows for simultaneous measurements of the two parameters by interrogation of the visibility and the displacement of interference fringes.
© 2011 Optical Society of America
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