Abstract

The accuracy of the resonant frequency servo loop is a major concern for high-performance operation of a resonant fiber optic gyro. This is usually resolved by adopting the central frequency of the laser source to track the resonance of the optical fiber ring resonator in one direction. However, the drift of the resonant frequency arising from resonator temperature fluctuation must be eliminated to maintain this accuracy. The traditional proportional integral (PI) frequency servo loop cannot address this issue very well. For instance, a bias error as large as tens or even hundreds of degrees/hour has been observed at the demodulated output of a resonant frequency servo loop. In this paper, we propose a method to eliminate this bias error by adding a double integral term in the traditional PI-based resonant frequency servo loop. We demonstrate that the double integral term can precisely track the linear resonant frequency drift, evidenced by our experimentally achieved close-to-zero bias error of $-0.0009\mathrm{deg}/\mathrm{h}$ at the demodulated output of the resonant frequency servo loop.

© 2014 Optical Society of America

Reduction of reset pulse in resonant frequency servo loop for resonant fiber-optic gyro by an auto-controlled reset technique

Huilian Ma, Xiao Lu, and Zhonghe Jin
Appl. Opt. 52(36) 8771-8778 (2013)

Full investigation of the resonant frequency servo loop for resonator fiber-optic gyro

Huilian Ma, Xiao Lu, Linzhi Yao, Xuhui Yu, and Zhonghe Jin
Appl. Opt. 51(21) 5178-5185 (2012)

Frequency tracking out-of-lock control in a resonator fiber-optic gyro

Ming Lei, Huaiyong Yu, Yuan Fang, Zhe Feng, Yanji Wu, and Lizhe Zhang
Appl. Opt. 59(4) 923-928 (2020)

Parameter optimization analysis to minimize the polarization error in a localized thermal tunable fiber ring resonator gyro

Prasada Rao Bobbili, Jagannath Nayak, Prerana Dabral Pinnoji, and D. V. Rama Koti Reddy
Appl. Opt. 55(8) 1996-2001 (2016)

Resonator fiber optic gyro employing a semiconductor laser

Zhonghe Jin, Xuhui Yu, and Huilian Ma
Appl. Opt. 51(15) 2856-2864 (2012)