Optimization of bias stability in an interferometric fiber optic gyroscope via optical switch modulation

We demonstrate an interferometric fiber optic gyroscope (IFOG) driven by an amplified spontaneous emission laser source, incorporating optical switch to reduce slowly varying errors and enhance stability. An optical switch operating at a frequency of 25 Hz enables complementary angular rate outputs, effectively suppressing low-frequency drift through differential processing. Current IFOG demonstrates superior performance compared to the feedback method configuration, with its angular random walk improved from 0.0021 to 0.0016 °/h and its bias instability showing a significant threefold improvement (from 0.0117 to 0.0038 °/h). Building upon its simple structure and long-term stability, this IFOG can be widely applied in inertial navigation systems.