ALL-FIBER RING-RESONATOR GYROSCOPE

An all-fiber resonator optic gyroscope employing a spliceless polariza tion maintaining fiber resonator with 90 degrees polarization rotation in the lapped coupler is presented. A frequency-modulation spectrosco py technique using two piezoelectric transducer phase modulators has b een theoretically analyzed and experimentally demonstrated for rotatio n sensing. The short term bias stability better than 16 degrees/h with integration time of 10s has been obtained. The main error sources of optical system are discussed and some reduction measures are suggested .