Rapidly Tunable Synthetic Wavelength Ranging with an RFSoC
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915611611758592 |
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| author | McSorley, Shawn M. P. Dix-Matthews, Benjamin P. Lance, Andrew M. Gozzard, David R. Schediwy, Sascha W. |
| author_facet | McSorley, Shawn M. P. Dix-Matthews, Benjamin P. Lance, Andrew M. Gozzard, David R. Schediwy, Sascha W. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_22499 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Rapidly Tunable Synthetic Wavelength Ranging with an RFSoC McSorley, Shawn M. P. Dix-Matthews, Benjamin P. Lance, Andrew M. Gozzard, David R. Schediwy, Sascha W. Optics Instrumentation and Detectors 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. |
| title | Rapidly Tunable Synthetic Wavelength Ranging with an RFSoC |
| topic | Optics Instrumentation and Detectors |
| url | https://arxiv.org/abs/2510.22499 |