Dual-polarization interferometric fiber optic gyroscope based on a four-port circulator

作者：Yuwen Cao, Lanxin Zhu, Yanjun Chen, Huimin Huang, Wenbo Wang, Yan He, Xiangdong Ma, Zhengbin Li · 发表于：Optics Express · 年份：2023 · DOI：10.1364/oe.476127 · 被引用次数：12 · 研究领域：Geophysics and Sensor Technology、Magneto-Optical Properties and Applications、Advanced Fiber Optic Sensors

The dual-polarization interferometric fiber optic gyroscope (IFOG) has been studied for many years and achieved remarkable performance. In this study, we propose a novel dual-polarization IFOG configuration based on a four-port circulator, in which the polarization coupling errors and the excess relative intensity noise are well handled meanwhile. Experimental measurements of the short-term sensitivity and long-term drift using a fiber coil with a length of 2 km and a diameter of 14 cm show that the angle random walk of 5.0×10 −5∘ /h and bias instability of 9.0 × 10 −5 ° /h are achieved. Moreover, the root power spectrum density of 20nrad/s/Hz is almost flat from 0.001 Hz to 30 Hz. We believe this dual-polarization IFOG is a preferred candidate for the reference-grade performance IFOG.