Influence of the modulation phase error on bias error in interferometric fiber optic gyroscope

摘要

The integrated optical chip (IOC) is one of the most critical parts of the interferometric fiber optic gyroscope (IFOG). Unfortunately, the integral implementation of the IOC has a number of undesirable effects, which includes the modulation phase error. The inflexible influence of the modulation phase error on the bias error is analyzed in theory. For demonstrating, a method is found to measure the modulation phase error quantitatively. By experiment, the quantized parameter and its effect on bias error are presented. In addition, we offer a practical method to compensate the mentioned effect in IFOG, which is proved by the quantitative measurement. This study proposes a direction for IOC manufacturing inspection and evaluation.