Resonator fiber-optic gyro with intensity error suppression using a bias-sampling compensation technique

Area of Science:

• Photonics and Optical Sensing
• Inertial Navigation Systems
• Precision Measurement

Background:

• Resonator Fiber-Optic Gyros (RFOGs) are key for advanced inertial rotation sensing.
• Frequency servo loops in RFOGs can induce drift due to intensity variations.
• Existing methods struggle to fully mitigate these intensity-induced errors.

Purpose of the Study:

• To propose and validate a bias-sampling compensation technique for RFOGs.
• To suppress intensity error and improve RFOG bias stability.
• To demonstrate tactical-grade performance in RFOGs.

Main Methods:

• Implementing a frequency servo loop with laser diode current adjustment.
• Developing and applying a bias-sampling compensation technique.
• Verifying the linear relationship between RFOG output and bias through theory and experiments.

Main Results:

• Intensity error was significantly suppressed using the bias-sampling compensation.
• RFOG bias stability improved dramatically from 127.2 to 7.4 deg/h.
• The technique demonstrated effective mitigation of intensity-induced drift.

Conclusions:

• The bias-sampling compensation technique effectively suppresses intensity errors in RFOGs.
• This method significantly enhances the bias stability of RFOGs.
• The achieved performance meets tactical-grade requirements for inertial sensors.