当前位置: X-MOL 学术J. Lightw. Technol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Excess Relative-intensity-noise Reduction in a Fiber Optic Gyroscope Using a Faraday Rotator Mirror
Journal of Lightwave Technology ( IF 4.7 ) Pub Date : 2020-12-15 , DOI: 10.1109/jlt.2020.3020432
Yue Zheng , Hongjie Xu , Jingming Song , Lijing Li , Chunxi Zhang

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/h1/2 to 0.58 mdeg/h1/2 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.

中文翻译:

使用法拉第旋转镜在光纤陀螺仪中过度降低相对强度噪声

光纤陀螺仪 (FOG) 受到宽带光源引起的过度相对强度噪声 (RIN) 的影响,这会显着影响 FOG 的角随机游走 (ARW)。现有的多余 RIN 抑制方法通常需要复杂的配置或大体积的设备,因此不适用于实际应用,尤其是小尺寸 FOG。更重要的是,由于决定过量RIN实际抑制效果的关键参数或组成部分以及相应的影响机制尚未阐明,因此在实践中没有评估或优化过量RIN减少配置的有效方法。在这项工作中,我们提出了一种简单而有效的方法来实现在解调频率上减少多余的 RIN,其中法拉第旋转镜插入源耦合器的死臂,以实现对多余 RIN 的延迟线滤波器。实验结果表明,导航级FOG的ARW从1.70 mdeg/h1/2提高到0.58 mdeg/h1/2。更重要的是,这项工作从理论上和实验上全面了解了过量 RIN 减少方案中的主要缺陷如何影响实际的过量 RIN 抑制效果,这证明了所提出的方案对内部和外部影响因素的固有鲁棒性。该方法特别适用于实现小尺寸FOG中的过量RIN减少和以最少的修改升级现有的FOG产品,并且对于评估和优化其他类似的过量RIN减少方案也具有潜在的参考价值。
更新日期:2020-12-15
down
wechat
bug