Experiment on Bias Stability Measurement of Resonator Fiber Optic Gyro with Digital Feedback Scheme

摘要

Experiment on bias stability measurement of resonator fiber optic gyro with a newly developed digital feedback scheme is performed and a sensitivity of 5.6×10~(-4) rad/s is demonstrated. Under the digital control scheme, the short term and long term laser central frequency drift are reduced by the output of a fast loop determined by proportional calculation to the order of several least significant bits (LSBs) and the output of a slow loop decided by an up/down counter, respectively. Resettling pulse noise due to imperfect 2π voltage of the hybrid digital serrodyne phase modulation waveform is also reduced by automatic proportional and integration (PI) control. Besides, polarization noise is suppressed by exciting single eigen state of polarization (ESOP) of the resonator with twice 90 degree polarization-axis rotated splicing.