Reduction of angle random walk by in-phase triangular phase modulation technique for resonator integrated optic gyro

Area of Science:

• Optics
• Photonics
• Inertial Navigation

Background:

• Resonator Integrated Optic Gyros (RIOGs) face challenges from backreflected light, causing frequency shifts and waveform distortion.
• Existing contra-phase triangular phase modulation (CPM) introduces unwanted ripple, increasing noise and Angle Random Walk (ARW).

Purpose of the Study:

• To propose and evaluate the in-phase triangular phase modulation (IPM) technique for RIOGs.
• To mitigate waveform distortion and reduce the ARW in RIOGs.

Main Methods:

• Implementation of in-phase triangular phase modulation (IPM) in a planar optical waveguide ring resonator.
• Comparison of IPM with contra-phase triangular phase modulation (CPM) in terms of waveform quality and ARW.

Main Results:

• IPM effectively eliminates the cosine-like ripple observed with CPM.
• Waveform quality of the resonator output is significantly improved using IPM.
• The Angle Random Walk (ARW) of the gyro was reduced from 3 deg/h¹/² to 0.8 deg/h¹/² with IPM.

Conclusions:

• IPM is a superior modulation technique for RIOGs compared to CPM.
• IPM offers a novel approach for backreflection and backscattering suppression in optical gyroscopes.
• The proposed IPM technique enhances the precision and reduces noise in optical gyros.