Zhao Shuangxiang, Liu Qingwen, Liu Yuanyuan, He Zuyuan
Opt Lett. 2022 Aug 1;47(15):3624-3627. doi: 10.1364/OL.463204.
In the past decade, laser-driven resonant fiber-optic sensors (RFOSs) have been reported touching their ultimate resolution limit. The practicability of these high-performance sensors is, however, discounted because of high system complexity and dependence on narrow-linewidth lasers. In this paper, a novel, to the best of our knowledge, white-light-driven RFOS is established based on a round trip filtering (RTF) method. Via measuring the RTF loss of an add-drop fiber ring resonator (FRR) sensor, strain signal can be read out with an ultra-simple open-loop configuration. In the sensing experiment, even a resolution of several femto-strain around 1 kHz is demonstrated, representing the highest resolution level of RFOS to date. Thanks to the obvious superiority in both resolution, simplicity, and cost over traditional laser-driven RFOSs, the proposed white-light-driven RFOS is believed to be a milestone in the development of fiber-optic strain sensors.
在过去十年中，已有报道称激光驱动的共振光纤传感器（RFOS）已接近其极限分辨率。然而，由于系统复杂性高且依赖窄线宽激光器，这些高性能传感器的实用性大打折扣。在本文中，据我们所知，基于往返滤波（RTF）方法建立了一种新型的白光驱动RFOS。通过测量分插光纤环形谐振器（FRR）传感器的RTF损耗，可以采用超简单的开环配置读出应变信号。在传感实验中，甚至展示了在1 kHz左右达到几个飞应变的分辨率，这代表了迄今为止RFOS的最高分辨率水平。由于与传统激光驱动的RFOS相比，在分辨率、简单性和成本方面具有明显优势，因此所提出的白光驱动RFOS被认为是光纤应变传感器发展中的一个里程碑。
