Abstract: A closed-loop fiber-optics gyro is composed of an open-loop fiber-optics gyro with an electro-optical modulator to realize phase compensation. With analysis of the phase-shift compensation character, an experimental method for determining linearity error in gyro output is provided in this paper. The method exhibits the significance for enhancement of gyro output linearity.

Key words: fiber-optics gyro, phase-shift compensation, linearity error