Abstract

The fiber optic gyroscope (FOG) suffers from the excess relative intensity noise (RIN) caused by the broadband light source, which significantly impacts the angular random walk (ARW) of the FOG. The existing suppression methods for the excess RIN usually require complex configuration or devices with big volume, and thus are not suitable for practical applications especially in small-sized FOGs. What is more, as the key parameters or components, that determine the practical suppression effects of the excess RIN, and the corresponding impacting mechanisms are not clarified, there is no efficient way in evaluating or optimizing the excess-RIN reduction configuration in practice. In this work, we propose a simple but effective method to achieve the reduction of the excess RIN at the demodulation frequency, in which a Faraday rotator mirror is inserted to the dead arm of the source coupler to realize the delay line filter for the excess RIN. Experimental results show that the ARW is improved from 1.70 mdeg/h^1/2 to 0.58 mdeg/h^1/2 for a navigation-grade FOG. More importantly, this work provides a comprehensive understanding on how the main defects in the excess-RIN reduction scheme impact the practical excess-RIN suppression effects both theoretically and experimentally, which demonstrates the inherent robustness of the proposed scheme against internal and external influencing factors. This method is especially suitable for realizing the excess-RIN reduction in small-sized FOGs and upgrading the existing FOG products with minimal modifications, and is also potentially referable in evaluating and optimizing other similar excess-RIN reduction schemes.

Fiber optic gyroscope noise reduction with fiber ring resonator

Haisheng Zhang, Xingfan Chen, Xiaowu Shu, and Cheng Liu
Appl. Opt. 57(25) 7391-7397 (2018)

Angular random walk improvement of a fiber-optic gyroscope using an active fiber ring resonator

Haisheng Zhang, Xingfan Chen, Xiaowu Shu, and Cheng Liu
Opt. Lett. 44(7) 1793-1796 (2019)

Improvement of angle random walk of fiber-optic gyroscope using polarization-maintaining fiber ring resonator

Yishi Liu, Xiaowan Luo, and Xingfan Chen
Opt. Express 30(17) 29900-29906 (2022)

Reduction of relative intensity noise in a broadband source-driven RFOG using a high-frequency modulation technique

Shuang Liu, Lu Liu, Junyi Hu, Qingwen Liu, Huilian Ma, and Zuyuan He
Opt. Lett. 47(19) 5100-5103 (2022)

Application of the Wiener filter for intensity noise reduction in fiber optic gyroscopes

Chao Zhang, Yao Mao, Xi Zhou, and Ge Ren
Appl. Opt. 58(20) 5568-5574 (2019)