All-optical coherent pulse compression for dynamic laser ranging using an acousto-optic dual comb

We demonstrate a new and simple dynamic laser ranging platform based on analog all-optical coherent pulse compression of modulated optical waveforms. The technique employs bidirectional acousto-optic frequency shifting loop, which provides dual-comb photonic signal with an bandwidth in the microwave range. This architecture simply involves CW laser, standard telecom components low electronics, both for generation detection. As system, it offers range resolution few millimeters, set by spectral 24 GHz, precision 20 µm integration time ms. system is also shown to provide measurements at scanning rates acoustic range, including phase-sensitive Doppler shift velocimetry. In addition, we show that application perfect correlation phase sequences transmitted waveforms allows ambiguity be extended factor 10 up ?20 m. generates quasi-continuous peak power, makes possible envision long-range telemetry or reflectometry requiring highly amplified signals.