Open AccessUltrafast and temperature-insensitive strain interrogation using a PM-PCF based Sagnac loop interferometer and wavelength-to-time mapping
Author(s) -
Zhuoya Bai,
Fengping Yan,
Wenguo Han,
Luna Zhang,
Daizhan Cheng,
Wei Wang,
Ting Li,
Qi Qin,
Ying Guo,
Xiaoze Du,
Hong Zhou
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.422772
Subject(s) - ultrashort pulse , optics , interferometry , materials science , photonic crystal fiber , wavelength , time domain , oscilloscope , interrogation , optoelectronics , physics , laser , computer science , archaeology , detector , computer vision , history
A novel approach for ultrafast and temperature-insensitive strain interrogation using a polarization-maintaining photonic crystal fiber (PM-PCF) based Sagnac loop interferometer (SLI) and linear wavelength-to-time (WTT) mapping is proposed and experimentally demonstrated. The PM-PCF incorporated in the SLI is used as the sensing element to achieve stable strain sensing with ultra-low temperature-dependence due to its intrinsic thermal insensitivity, which can be used to eliminate the cross-sensitivity effect and increase the measurement accuracy. A dispersive element is employed to realize the WTT mapping and real-time strain interrogation is obtained by converting the strain-encoded wavelength shift to time shift in the temporal domain, which can be directly monitored by a real-time oscilloscope. The proposed system offers an ultrafast interrogation speed of 100 MHz and a strain sensitivity of -0.17 ps/με.