Multi-Channel Acoustic Detection with Polarization Hole Burning Effect in Multi-Wavelength Erbium-Doped Fiber Laser

In this paper, we propose and demonstrate a novel multi-point sound source localization system utilizing the hole-burning effect in erbium-doped fiber lasers and Fabry-Perot (F-P) sensors for signal reception. The system employs nonlocal mean filtering and empirical mode decomposition algorithms for preprocessing sound signals, effectively filtering external noise while preserving the original signal integrity. The generalized quadratic cross-correlation algorithm is then applied to determine delay differences between adjacent F-P sensors, facilitating precise sound source localization. Experimental results demonstrate the effectiveness of this approach in accurately locating sound sources based on signals received from four sensors.