Quadrature phase stabilized three-wavelength interrogation of fiber-optic Fabry–Perot acoustic sensor

Published on 2019-11-04T20:51:19Z (GMT) by
In this letter, we propose a quadrature phase stabilized three-wavelength demodulation technique for the interrogation of fiber-optic Fabry–Perot acoustic sensors. It is based on accurate and fast tuning of a monolithic modulated grating Y-branch (MG-Y) laser. Three quadrature wavelengths are chosen to perform high-speed cavity length demodulation by wavelength switching, so that avoiding imbalances and disturbances between the three optical paths in the conventional three-wavelength quadrature phase demodulation systems. A feedback stabilization scheme for maintaining the quadrature phase condition has been proposed and demonstrated for the first time, making it potential for long-term monitoring in harsh environments.

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Liu, Qiang; Jing, Zhenguo; Liu, Yueying; Li, Ang; Zhang, Yang; Huang, Zhiyuan; et al. (2019): Quadrature phase stabilized three-wavelength interrogation of fiber-optic Fabry–Perot acoustic sensor. The Optical Society. Collection. https://doi.org/10.6084/m9.figshare.c.4666427