Correlated Photon Lidar Based on Time-Division Multiplexing

• DOI: 10.3390/photonics12020114
• Publication Date: 2025-01-27T14:42:23Z
• Authors: Yun Jiang; Bo Liu; Zixun Wang; Fengyun Huang; Taibei Liu; Lan Luo; Feifan He; Yongqi Yang; Bin Zhao
• Keywords: Time-division multiplexing

Single-photon lidar (SPL) exhibits high sensitivity, making it particularly suitable for detecting weak echoes over long distances. However, its susceptibility to background noise necessitates the implementation of advanced filtering techniques and complex algorithms, which can significantly increase system cost complexity. To address these challenges, we propose a time-division-multiplexing-based correlated photon that employs narrowband pulsed laser with stable time delays variable pulse intensities, thereby establishing temporal intensity correlations. This all-fiber solution not only simplifies architecture but also enhances operational efficiency. An adaptive cross-correlation method incorporating slicing has been developed extract histogram signals, enabling successful 1.5 km distance measurements under intense daytime conditions, using 1 s accumulation 20 mm receiving aperture. The experimental results demonstrate 38% (from 1.11 1.52) improvement in signal-to-noise ratio (SNR), enhancing system’s anti-noise capability, facilitating rapid detection, reducing overall costs.