AI 中文总结
通过子空间追踪与多源Ikeda映射模拟，揭示泵浦相位噪声、散粒噪声等不同物理源如何通过拉曼非线性转换为共模和重复率噪声，为低噪声微梳设计提供机制基础。
AI 中文摘要
相位噪声限制了孤子微梳的相干性和稳定性，但由于多个噪声源同时作用，其来源难以追溯。它通常由共模分量和重复率分量表示，但每个物理源如何贡献于这些分量仍不清楚。我们将子空间追踪与多源Ikeda映射模拟相结合，通过开关每个源和拉曼非线性来隔离其贡献。在没有拉曼效应时，泵浦相位噪声是纯共模的，而散粒噪声和放大自发辐射驱动重复率噪声。存在拉曼效应时，非线性相干地将泵浦相位噪声从共模转换为重复率噪声，而不引入独立噪声源，产生抛物线型线宽轮廓，其静默点最小值低于泵浦线宽。当所有噪声源都存在时，散粒噪声、ASE和RIN提高了共模基底并将该最小值移向泵浦，设定了可实现的噪声基底。因此，腔内动力学不仅携带噪声，而且主动分配噪声，为低噪声微梳设计提供了机制基础。
英文摘要
Phase noise limits the coherence and stability of soliton microcombs, yet its origin is difficult to trace because multiple noise sources act simultaneously. It is often represented by common-mode and repetition-rate components, but how each physical source contributes to these components remains unclear. We combine subspace tracking with multi-source Ikeda-map simulations, switching each source and the Raman nonlinearity on and off to isolate its contribution. Without Raman, pump phase noise is purely common-mode, while shot noise and amplified spontaneous emission drive the repetition rate noise. With Raman, the nonlinearity coherently converts pump phase noise from common-mode into repetition-rate noise without introducing an independent noise source, yielding a parabolic linewidth profile with a quiet-point minimum below the pump linewidth. When all noise sources are present, shot noise, ASE, and RIN raise the common-mode floor and shift this minimum toward the pump, setting the achievable noise floor. The intracavity dynamics thus do not merely carry noise but actively partition it, providing a mechanistic basis for low-noise microcomb design.
Comments10 pages, 7 figures
