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The article shows the possibility of using TFBG gratings to measure the radius of curvature of fiber bending in
conditions of variable polarization of the introduced light. Most of the modern, stable light sources generate light
with a high degree of polarization. Due to the spatial asymmetry, the direction of the light polarization plane affects
the spectral parameters of individual modes. For this reason, in the measurement systems using TFBGs presented
so far it becomes necessary to determine and control the state of light polarization directly in front of the periodic
structure. The article presents the determined spectral parameters of the cladding modes which allow bending
measurements regardless of the direction of polarization of the introduced light. Thanks to this, the measuring
system can be constructed without providing control of the introduced light polarization angle, which makes its
construction simpler. When using TFBGs with an angle of 2°, the accuracy of determining the bending radius in
the range from 15 mm to 30 mm when changing the angle of the plane of polarization in the full range is 0.318
mm in the case of changes in the transmission coefficient. For changes in the wavelength of the selected cladding
mode, the accuracy is 0.3203 mm, with the input light polarization being changed in the range from 0° (P type) to
90° (S type).
