20 GHz 正常色散螺旋微谐振器中开关波动力学的直接观测
Direct Observation of Switching-Wave Dynamics in 20 GHz Normal Dispersion Spiral Microresonators
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中文总结 AI 辅助
本研究通过同步双泵浦方案在350 nm薄SiN螺旋微谐振器中实现20 GHz正常色散微梳，利用绝热曲率工程平衡品质因数与模式交叉，直接观测开关波动力学，验证了与模拟的一致性，为微波频率微梳生成提供可扩展策略。
中文摘要 AI 辅助
集成克尔频率梳是微波光子学、光谱学和光通信的强大工具。传统架构依赖于反常色散区，这通常需要厚且高应变的氮化硅层，从而复杂化了标准CMOS代工厂的制造工艺。较薄的层可以规避这些制造限制，但会产生正常色散微梳，由于缺乏自发调制不稳定性，通常需要特定的触发机制，如确定性种子注入。在这里，我们展示了在正常色散区中通过电光边带调制的同步双泵浦方案产生20 GHz微梳。该平台利用阿基米德螺旋几何结构，在兼容代工厂的350 nm薄SiN平台上实现。通过采用绝热曲率工程，谐振器在紧凑的占地面积与超过$7 \ imes 10^6$的固有品质因数之间取得平衡，同时有效消除与高阶模式的避免模式交叉。这种强色散架构产生低重复率微梳，具有高每线功率和皮秒级时间轮廓，从而能够直接光学采样和表征输出耦合的开关波波形。在多种泵浦失谐范围内测量的动力学与模拟结果表现出极好的一致性。我们的工作建立了一种可扩展的、占地面积高效的正常色散微梳在微波频率下生成的策略，并具有扩展到其他波长范围的潜力。
英文摘要
Integrated Kerr frequency combs are powerful tools for microwave photonics, spectroscopy, and optical communications. While traditional architectures rely on the anomalous-dispersion regime, this typically requires thick, highly strained silicon nitride layers that complicate standard CMOS-foundry fabrication. Thinner layers circumvent these fabrication constraints but yield normal-dispersion microcombs that generally require specific trigger mechanisms, such as deterministic seeding, due to the absence of spontaneous modulational instability. Here, we demonstrate the generation of a 20 GHz microcomb in the normal-dispersion regime, driven by a synchronized dual-pump scheme via electro-optic sidebands modulation. The platform leverages an Archimedean spiral geometry on a foundry-compatible, 350 nm-thin SiN platform. By employing adiabatic curvature engineering, the resonator balances a compact footprint with an intrinsic quality factor exceeding $7 \times 10^6$, while effectively eliminating avoided mode crossings with higher order modes. This strong-dispersion architecture yields a low-repetition-rate microcomb featuring high power-per-line and picosecond-scale temporal profile, which enables the direct optical sampling and characterization of the out-coupled switching wave waveforms. The measured dynamics across a range of pump desynchronizations demonstrate excellent agreement with simulations. Our work establishes a scalable, strategy for footprint-efficient normal-dispersion microcomb generation at microwave frequencies, with potential for scaling to other wavelength ranges.
发表机构
- Laboratoire Interdisciplinaire Carnot de Bourgogne ICB UMR 6303, Université Bourgogne Europe, CNRS（勃艮第卡诺跨学科实验室、勃艮第欧洲大学、法国国家科学研究中心）
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