论文标题
直接访问Aln微林谐振器中的八度散开耗散的Kerr Soliton频率梳子
Directly accessing octave-spanning dissipative Kerr soliton frequency combs in an AlN microring resonator
论文作者
论文摘要
基于光学微孔子的自我引用的耗散性KERR孤子（DKS）提供了突出的特征，包括微型化，低功耗，宽光谱范围和固有的连贯性，用于精确测量，通信，微波光子学和天文学光谱仪校准。迄今为止，仅在超高Q硅硝酸硅微孔子中才能实现具有约1 Thz的自由光谱范围（FSR）的八度跨度DKS，并具有精心的波长控制。在这里，我们在氮化铝（ALN）微孔子中表现出具有中等负载Q（500,000）和374 GHz的FSR的八度跨度DK。在设计中，TE00模式和TE10模式几乎是退化的，并充当泵和辅助模式。辅助共振的存在平衡了耗散孤子梳形成中的热拖动效果，从而通过单个泵进行了至关重要的简化DKS生成，并导致了一个宽的单孤子访问窗口。我们在实验上以创纪录的单孤子步骤（〜80 pm）和八度带宽（1100-2300 nm）通过绝热泵调谐和340兆瓦的片上功率来证明稳定的DKS操作。我们的方案还允许以很高的概率直接创建DKS状态，并且不需要精心设计的波长或稳定孤子行为的功率方案。
Self-referenced dissipative Kerr solitons (DKSs) based on optical microresonators offer prominent characteristics including miniaturization, low power consumption, broad spectral range and inherent coherence for various applications such as precision measurement, communications, microwave photonics, and astronomical spectrometer calibration. To date, octave-spanning DKSs with a free spectral range (FSR) of ~1 THz have been achieved only in ultrahigh-Q silicon nitride microresonators, with elaborate wavelength control required. Here we demonstrate an octave-spanning DKS in an aluminium nitride (AlN) microresonator with moderate loaded Q (500,000) and FSR of 374 GHz. In the design, a TE00 mode and a TE10 mode are nearly degenerate and act as pump and auxiliary modes. The presence of the auxiliary resonance balances the thermal dragging effect in dissipative soliton comb formation, crucially simplifying the DKS generation with a single pump and leading to a wide single soliton access window. We experimentally demonstrate stable DKS operation with a record single soliton step (~80 pm) and octave-spanning bandwidth (1100-2300 nm) through adiabatic pump tuning and on-chip power of 340 mW. Our scheme also allows for direct creation of the DKS state with high probability and without elaborate wavelength or power schemes being required to stabilize the soliton behavior.
