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Open-loop operation experiments in a resonator fiber-optic gyro using the phase modulation spectroscopy technique.

Xu-lin Zhang1, Hui-Iian Ma, Zhong-he Jin

  • 1Department of Information Science and Electrical Engineering, Zhejiang University, China.

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|October 28, 2006
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Summary

This study optimizes phase modulation (PM) spectroscopy for resonator fiber-optic gyros. Maximizing the signal slope enhances gyro sensitivity, enabling applications in compact integrated optical ring systems.

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Area of Science:

  • Optics and Photonics
  • Sensing Technology
  • Optical Gyroscopes

Background:

  • Resonator fiber-optic gyros (RFOGs) are crucial for navigation and sensing.
  • Sensitivity in RFOGs is often limited by detection system performance.
  • Phase modulation (PM) spectroscopy is a technique used for signal detection in optical systems.

Purpose of the Study:

  • To develop and optimize a phase modulation (PM) spectroscopy detection system for resonator fiber-optic gyros.
  • To enhance the ultimate sensitivity of the gyro by maximizing the demodulated signal slope.
  • To explore the applicability of this technique to micro-optic gyros.

Main Methods:

  • Utilized phase modulation (PM) spectroscopy technique for signal detection.
  • Optimized modulation frequency and index using Bessel function expansion and optical field overlapping.
  • Investigated the effect of modulation frequency on the open-loop gyro output signal.
  • Considered LiNbO3 phase modulators with cutoff frequencies up to several gigahertz.

Main Results:

  • The slope of the demodulated curve near the resonant point significantly impacts gyro sensitivity.
  • Optimized modulation parameters were identified to maximize the demodulated signal slope.
  • The detection technique demonstrated potential for high sensitivity in RFOGs.
  • The system is suitable for resonator micro-optic gyros with integrated optical rings under 10 cm.

Conclusions:

  • The optimized PM spectroscopy detection system enhances the sensitivity of resonator fiber-optic gyros.
  • This technique offers a viable solution for high-performance sensing in compact integrated optical ring systems.
  • The high-frequency capability of PM modulators supports advanced gyro designs.