Simplified phase noise compensation architecture for distributed acoustic sensing enabled by receiver multiplexing
Zhengyuan Xiao, Jiageng Chen, Jiazhen Ji, Zhengwen Li, Zuyuan He · Optics Express · 2025
Phase noise compensation (PNC) schemes in distributed acoustic sensors (DAS) with coherent detection can relax light source coherence requirements and improve performance, but typically introduce extra overhead and complexity due to the dedicated optical receivers for measuring laser phase noise. In this paper, a simplified PNC-DAS scheme is presented, leveraging only one coherent receiver to simultaneously detect Rayleigh scatterings and laser phase noise. A 49 km sensing range with a 100 kHz linewidth laser is achieved in the demonstrated system, along with a strain resolution of 78.2 p ε / Hz and a spatial resolution of 3.7 m, without any additional auxiliary interferometers in this scheme. The simplification of high-performance PNC is expected to facilitate wider adoption of this technology in DAS based on coherent detection, and broaden the applicability of laser for communication purposes in DAS.