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12 March 2024 Fourfold extended-range of coherent LiDAR based on quadrature detection with 4x4 coupler
Jaeheung Kim, Won Tae Choe, Seongjin Bak, Chang-Seok Kim
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Proceedings Volume PC12893, Photonic Instrumentation Engineering XI; PC1289304 (2024) https://doi.org/10.1117/12.3003595
Event: SPIE OPTO, 2024, San Francisco, California, United States
Abstract
Coherent LiDAR is a highly sensitive sensing technology with immunity to ambient light interference and the ability to measure velocity. It emits a wavelength-swept light signal and calculates the beat frequency between reference and sample light to measure the distances of targets. Recent advancements in signal modulation techniques, particularly quadrature detection, have effectively improved the detectable range of coherent LiDAR. In this study, we employ a 4x4 coupler for quadrature detection and incorporate dual reference paths with varying optical delays through an optical switch. This approach achieves a fourfold range extension compared to the conventional setup, while utilizing the same laser source and data acquisition process.
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Jaeheung Kim, Won Tae Choe, Seongjin Bak, and Chang-Seok Kim "Fourfold extended-range of coherent LiDAR based on quadrature detection with 4x4 coupler", Proc. SPIE PC12893, Photonic Instrumentation Engineering XI, PC1289304 (12 March 2024); https://doi.org/10.1117/12.3003595
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KEYWORDS
LIDAR
Signal detection
Beam path
Photodetectors
Target detection
Modulation frequency
Optical coherence
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