Double closed-loop resonant micro optic gyro using hybrid digital phase modulation

Area of Science:

• Photonics
• Optical Engineering
• Inertial Sensing

Background:

• Closed-loop operation in optical gyros enhances dynamic range and linearity.
• Digital serrodyne waves can function as frequency shifters in phase modulators.
• Traditional methods require precise matching of stair width to optical transmission time.

Purpose of the Study:

• To investigate the hybrid digital phase modulation (HDPM) scheme for optical gyros.
• To identify the physical mechanism enabling relaxation of stair width constraints in HDPM.
• To optimize HDPM parameters for improved bias stability in ring-شكلي optical gyros.

Main Methods:

• Theoretical analysis and detailed simulations of the HDPM scheme.
• Experimental implementation of HDPM in a waveguide ring resonator optical gyro.
• Optimization of stair width based on digital-to-analogue converter rise time.

Main Results:

• The stair width in HDPM is not limited by optical transmission time.
• Optimal stair width depends on the digital-to-analogue converter's rise time.
• Achieved a bias stability of 0.05°/s with a 400-second integration time.

Conclusions:

• HDPM offers a relaxed and optimized approach to frequency shifting in optical gyros.
• The optimized HDPM scheme significantly improves bias stability in ring resonator optical gyros.
• This advancement is crucial for high-performance inertial sensing applications.