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Optical ranging is a key technology in metrology. Optical frequency combs areshown to provide several advantages in light ranging, offering high precisionwith high acquisition rate. However, performance of traditional ranging systemsbased on microcombs is limited by the short ambiguity distance andnon-real-time processing. Here, we show that dual-comb ranging system usingcoherent Kerr soliton microcombs and optical switch realizes extended ambiguitydistance and provides a route to real-time processing. The ambguity distance isextended to 3.28 m from about 1.5 mm and the uncertainty reaches about 1.05times 10^-7, while the system is compatible with low-bandwidth detectors.Combining coherent microcomb ranging systems with special FPGA could enablecomb-based real-time ranging systems for several applications such asindustrial process monitoring.

Optical Ranging Using Coherent Kerr Soliton Dual-microcombs with Extended Ambiguity Distance