Design a free-space fiber coil gyroscope using Mueller matrix

Polarization errors with small cross-couplings and signalfading in the SM fiber coil in the depolarized gyroscopes are usually appeared in the depolarized gyroscopes. In order to solve the problems of polarization errors and signal-fading, a free-space unit matrix structure in the fiber coil designed by the Stokes parameter method is proposed to minimize the bias errors. As a result of analysis in model, it can minimize the bias errors to the order of 10^-4 °/h. As the authors´ knowledge, this is the first idea using a free-space unit matrix structure in the SM fiber coil applied to fiber optic gyroscope.