AI 中文总结
研究利用共轭相位噪声消除（CPNC）技术，结合独立自由运行的分布反馈（DFB）激光器，实现低成本频域双梳测距，能消除公共激光相位因子等，降低光源稳定和相位管理复杂性，达到亚微米测距精度。
AI 中文摘要
频域双梳测距结合了快速采集和干涉灵敏度，但高性能实现通常依赖于相互相干或主动稳定的梳状光源。自由运行光源可减轻硬件负担，但其相位噪声和光频偏移漂移会模糊射频梳齿并削弱探测-参考相位相关性。以往的相位斜率实现依赖于充分分辨的射频齿、相干长度内的探测-参考路径或对这些波动的显式数字跟踪。本文展示了一种低成本频域双梳测距架构，它将独立的自由运行分布反馈（DFB）激光器与共轭相位噪声消除（CPNC）相结合。通过在提取各个射频梳齿的相位之前形成自共轭信号，CPNC消除了公共激光相位因子和漂移的光频偏移项，同时保留了与距离相关的相位斜率。使用线宽为12MHz和9MHz 的DFB激光器注入的电光梳，我们在246μs时实现了219nm的阿伦偏差，并通过CPNC将单帧距离标准偏差从558μm降低到9.31μm。在测试的兆赫兹线宽配置中，CPNC实现的最小阿伦偏差低于250nm。这些结果表明，CPNC能够在低成本频域双梳架构中实现亚微米测距，同时降低了光源稳定和相位管理的复杂性。
英文摘要
Frequency-domain dual-comb ranging combines rapid acquisition with interferometric sensitivity, but high-performance implementations often rely on mutually coherent or actively stabilised comb sources. Free-running sources can reduce this hardware burden, but their phase noise and drift of the optical frequency offset can blur radio-frequency (RF) comb teeth and weaken probe-reference phase correlation. Previous phase-slope implementations have therefore relied on sufficiently resolved RF teeth, within-coherence-length probe-reference paths or explicit digital tracking of these fluctuations. Here we demonstrate a low-cost frequency-domain dual-comb ranging architecture that combines independent free-running distributed-feedback (DFB) lasers with conjugate phase-noise cancellation (CPNC). By forming a self-conjugate signal before the phases of individual RF-comb teeth are extracted, CPNC cancels the common laser phase factor and drifting optical-frequency-offset term while retaining the distance-dependent phase slope. Using electro-optic combs seeded by DFB lasers with linewidths of 12 MHz and 9 MHz, we achieve an Allan deviation of $219~\mathrm{nm}$ at $246~μ\mathrm{s}$ and reduce the single-frame distance standard deviation from $558~μ\mathrm{m}$ to $9.31~μ\mathrm{m}$ with CPNC. Across the tested megahertz-linewidth configurations, CPNC delivered minimum Allan deviations below $250~\mathrm{nm}$. These results show that CPNC enables submicrometre ranging in a low-cost frequency-domain dual-comb architecture with reduced source-stabilisation and phase-management complexity.
Comments29 pages, 11 figures and 1 table, including Supplementary Information
