Opt Express. 2023 Apr 24;31(9):14873-14887. doi: 10.1364/OE.476127.
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/ and bias instability of 9.0 × 10/h are achieved. Moreover, the root power spectrum density of 20 // 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.
双偏振干涉光纤陀螺（IFOG）已经研究了多年，并取得了显著的性能。在本研究中，我们提出了一种基于四端口环行器的新型双偏振 IFOG 结构，该结构同时很好地处理了偏振耦合误差和过剩相对强度噪声。使用长度为 2km、直径为 14cm 的光纤线圈进行的短期灵敏度和长期漂移的实验测量表明，实现了 5.0×10/的角度随机游走和 9.0×10/h 的偏置不稳定性。此外，20 // 的根功率谱密度从 0.001Hz 到 30Hz 几乎是平坦的。我们相信这种双偏振 IFOG 是参考级性能 IFOG 的首选候选者。
