Abstract
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 laser. Three quadrature wavelengths are chosen to perform high-speed cavity length demodulation by wavelength switching, thereby avoiding imbalances and disturbances between the three optical paths in conventional three-wavelength quadrature phase-demodulation systems. A feedback-stabilization scheme for maintaining the quadrature phase condition is proposed for the first time, to the best of our knowledge, providing potential for long-term monitoring in harsh environments.
Original language | English (US) |
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Pages (from-to) | 5402-5405 |
Number of pages | 4 |
Journal | Optics Letters |
Volume | 44 |
Issue number | 22 |
DOIs | |
State | Published - Nov 15 2019 |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics