标题： 动态数字合成波长光学绝对测距 显示英文标题

标题： Dynamic Digital Synthetic Wavelength Optical Absolute Ranging

摘要： 光学范围和飞行时间的测量对于各种高精度技术至关重要。 竞争性的光学测量技术已经被开发出来，这些技术在精度与准确度以及系统复杂性之间取得平衡。 在这里，我们提出一种连续波合成波长干涉技术，该技术采用数字可调的电光频率梳。 通过软件定义的无线电，我们的方法可以动态扫描合成波长并测量绝对光学范围。 我们在一个1米的自由空间光延迟线和一个40公里的光纤链路上演示了这种数字方法。 在延迟线上获得的最佳精度优于60纳米（0.2飞秒）。 通过一个40公里的光纤卷轴，这种精度退化到15微米（50飞秒），这相当于约2e-10米/米的分数误差。 我们的设计易于实现，仅依赖于连续波干涉，从而降低了系统复杂性。 显示英文摘要

摘要： Measurements of optical range and time-of-flight are crucial for a variety of high-precision technologies. Competitive optical measurement techniques have been developed that balance precision with accuracy and system complexity. Here, we present a continuous-wave synthetic wavelength interferometry technique that employs digitally tunable electro-optic frequency combs. With a software-defined radio, our approach can dynamically sweep the synthetic wavelength and measure absolute optical range. We demonstrate this digital approach over a free-space optical delay line of 1 m and over an 40 km fiber link. The best obtained precision over the delay line is better than 60 nm (0.2 fs). Through a 40 km fiber spool, this precision degrades to 15 um (50 fs), which is a fractional error on the order of 2e-10 m/m. Our design is simple to implement, and only relies on continuous-wave interference, decreasing system complexity.