Abstract

We present a compact in-line fiber interferometric sensor fabricated in a boron doped two-mode highly birefringent microstructured fiber using a CO2 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 20700°C and 017mstrain. The sensitivity coefficients corresponding to fringe displacement and contrast variations are equal respectively for strain 2.51nm/mstrain and 0.02561/mstrain and for temperature 16.7pm/°C and 5.74×1051/°C. 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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