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The paper presents a method of measuring the angle of light polarisation plane rotation. Measurement is done with
a tilted fibre Bragg grating (TFBG), with a tilt angle of 7°, and an optical spectrum analyser. Data obtained with
the analyser are processed with a fast Fourier transform (FFT) to obtain frequency representation (FFT
coefficients). The rotation angle is calculated by comparing such coefficients obtained from the measurement with
the ones collected during measurement set calibration. It has been shown that FFT coefficients change in the
function of polarisation plane rotation and in the case of some of them, these changes have regular character and
can be used to determine rotation. The method shown works in the range of 0−180° of rotation with an average
error of 0.076° and a median error of 0.033°. The highest values of errors appear about 0, 45, 90, 135 and 180°,
which is caused by flat characteristics of many frequencies for these angles of rotation. The method discussed
could find applications in many fields of structure monitoring and maintenance, where rotation or twist could be
used as a quality parameter.
