Enhanced differential detection technique for the resonator integrated optic gyro.

Area of Science:

• Optical Engineering
• Inertial Navigation Systems
• Sensor Technology

Background:

• Resonator Integrated Optic Gyros (RIOGs) are crucial for inertial navigation but suffer from common-mode signals and reciprocal errors.
• Existing techniques struggle to suppress these errors effectively, limiting detection accuracy and long-term stability.
• Improving the reciprocity and signal-to-noise ratio is essential for advancing RIOG performance.

Purpose of the Study:

• To introduce an Enhanced Differential Detection Technique (EDDT) for suppressing common-mode signals in RIOGs.
• To improve the detection accuracy and bias stability of open-loop RIOGs.
• To demonstrate a novel RIOG structure that enhances reciprocity and reduces errors.

Main Methods:

• Proposed a novel transmissive resonator structure to promote RIOG reciprocity.
• Developed and theoretically analyzed the Enhanced Differential Detection Technique (EDDT).
• Calculated the optimal gain for the EDDT considering intrinsic RIOG noises.

Main Results:

• The EDDT effectively suppresses common-mode signals and reciprocal errors.
• Differential-mode output is amplified without common-mode signal limitations, proportional to angular rotation.
• Achieved a long-term bias stability of 0.0029 deg/s over a 2-hour period.

Conclusions:

• The EDDT significantly enhances the detection accuracy of RIOGs.
• The novel structure and EDDT achieve state-of-the-art bias stability for open-loop waveguide ring resonator RIOGs.
• This technique represents a breakthrough in high-precision optical gyroscopes.