Dual-Polarization Fiber Optic Differential Interferometer for High-Sensitivity Sensing Applications

• DOI: 10.1109/jlt.2023.3339850
• Publication Date: 2023-12-06T18:57:34Z
• Authors: Lanxin Zhu; Fangshuo Shi; Yanjun Chen; Wenbo Wang; Huimin Huang; Xinyu Cao; Ziqi Zhou; Yan He; Zhengbin Li

The fiber optic differential interferometer (FODI) is a sensor capable of direct detection temporal derivatives measured physical quantities. However, its phase sensitivity currently constrained by the presence relative intensity noise (RIN). In this study, disruptive effects RIN are evaluated through theoretical analysis. Based on analysis, novel dual-polarization (DP-FODI), in which front-end integrated with new sensing probe, proposed. mechanism for suppression comprehensively elucidated analysis and numerical simulations. static self-noise tests DP-FODI employing delay length 2 km, successful achieved, leading to 10-fold enhancement from <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$ 1.6\times 10^{-6} \mathrm{rad/\sqrt{Hz}}$</tex-math></inline-formula> notation="LaTeX">$1.5\times 10^{-7} . Furthermore, dynamic experiments were conducted validate characteristics DP-FODI, realizing range exceeding 106 dB. exhibits significant potential application various domains, including strain monitoring underwater acoustic measurement.