Abstract
We report a slow-light fiber Bragg grating strain sensor with a resolution limited by the extremely low thermodynamic phase fluctuations of the fiber. This was accomplished by using a short grating (4.5 mm) to enhance the thermal phase noise, an ultra-stable interrogation laser to lower the laser frequency noise, and a slow-light mode with a high group index () to suppress all other noise sources. We demonstrate that in a similar but longer grating (21 mm), the phase noise is suppressed in inverse proportion to the square root of the length, in accordance with theory, leading to a strain resolution as low as and a minimum detectable length of at 1.5 kHz.
© 2017 Optical Society of America
Full Article | PDF ArticleMore Like This
Peide Liu, Wenzhu Huang, Wentao Zhang, and Fang Li
Opt. Lett. 43(11) 2499-2502 (2018)
Xiaofeng Jin, Yanhong Zhu, Jiaojiao Guo, Xiangdong Jin, Xianbin Yu, Shilie Zheng, Hao Chi, and Xianmin Zhang
Opt. Lett. 42(20) 4052-4054 (2017)
Qiang Wang, Zhen Wang, Jun Chang, and Wei Ren
Opt. Lett. 42(11) 2114-2117 (2017)