Fiber-optic laser gyro with easily introduced phase-difference bias

Area of Science:

• Optics and Photonics
• Optical Sensing
• Inertial Navigation

Background:

• Fiber-optic laser gyros (FOGs) are crucial for rotation sensing.
• Optimizing FOG sensitivity is key for high-precision applications.
• Introducing phase-difference bias is a potential method to enhance FOG performance.

Purpose of the Study:

• To propose and experimentally validate an optical system for introducing phase-difference bias in a fiber-optic laser gyro.
• To optimize the sensitivity of the fiber-optic laser gyro.
• To evaluate the rotation detection performance of the proposed system.

Main Methods:

• Development of an optical system designed for easy phase-difference bias introduction.
• Theoretical analysis of a laser diode's suitability for the system.
• Experimental setup utilizing a 300-m single-mode optical fiber, stabilized laser diode, and optical isolator.
• Rotation detection experiments to assess system performance.

Main Results:

• Successful implementation of an optical system for phase-difference bias.
• Demonstrated good linearity in rotation detection.
• Achieved a short-time resolution for the rotation rate better than 0.87 mrad/sec.

Conclusions:

• The proposed optical system effectively introduces phase-difference bias to enhance fiber-optic laser gyro sensitivity.
• The experimental results confirm the system's capability for precise rotation detection.
• The developed system shows promise for improving the performance of inertial navigation systems.