Platicon microcomb generation using laser self-injection locking.
Platicon microcomb generation using laser self-injection locking.
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DOI：
10.1038/s41467-022-29431-0
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发表时间：
2022-04-01
影响因子：
16.6
通讯作者：
Kippenberg TJ
中科院分区：
文献类型：
--
作者：
Lihachev G;Weng W;Liu J;Chang L;Guo J;He J;Wang RN;Anderson MH;Liu Y;Bowers JE;Kippenberg TJ
在过去的十年里，光子集成微梳的开发和系统级应用取得了重大进展，这是一种在毫米波到太赫兹域具有重复频率的相干、宽带光学频率梳。这些进展大多是基于利用群速度色散(GVD)反常的微谐振腔中的耗散克尔孤子(DKS)。然而，微梳也可以用正常的GVD使用局域结构产生，这种结构被称为暗脉冲、开关波或平板。与需要特殊设计和制造技术来进行分散工程的DKS微梳相比，Platicon微梳可以很容易地使用与CMOS兼容的平台来制造，例如具有正常GVD的薄膜(即厚度低于300 nm)的氮化硅。在这里，我们使用激光自注入锁定来演示一种在微波K波段重复频率下工作的全集成PLADICON微梳。边缘耦合到Si3N4芯片上的分布反馈(DFB)激光器被自注入锁定到具有高限制波导的高Q( >； 107)微谐振腔，并且无需复杂的主动控制就可以直接激励Platicons。我们演示了多重态和开关，进行了光反馈相位研究，并对K波段重复率和泵浦激光的相位噪声进行了表征。激光自注入锁定平板可以通过商业铸造服务，促进微梳作为光子集成电路的构建块被广泛采用。在这里，作者展示了在使用激光自注入锁定的集成光子芯片中产生Plation梳的过程，他们利用了普通GVD谐振器中的Platicons产生，这大大放宽了材料和几何设计的限制
The past decade has witnessed major advances in the development and system-level applications of photonic integrated microcombs, that are coherent, broadband optical frequency combs with repetition rates in the millimeter-wave to terahertz domain. Most of these advances are based on harnessing of dissipative Kerr solitons (DKS) in microresonators with anomalous group velocity dispersion (GVD). However, microcombs can also be generated with normal GVD using localized structures that are referred to as dark pulses, switching waves or platicons. Compared with DKS microcombs that require specific designs and fabrication techniques for dispersion engineering, platicon microcombs can be readily built using CMOS-compatible platforms such as thin-film (i.e., thickness below 300 nm) silicon nitride with normal GVD. Here, we use laser self-injection locking to demonstrate a fully integrated platicon microcomb operating at a microwave K-band repetition rate. A distributed feedback (DFB) laser edge-coupled to a Si3N4 chip is self-injection-locked to a high-Q ( > 107) microresonator with high confinement waveguides, and directly excites platicons without sophisticated active control. We demonstrate multi-platicon states and switching, perform optical feedback phase study and characterize the phase noise of the K-band platicon repetition rate and the pump laser. Laser self-injection-locked platicons could facilitate the wide adoption of microcombs as a building block in photonic integrated circuits via commercial foundry service. ’Here the authors provide the demonstration of platicon comb generation in an integrated photonic chip using laser self-injection locking, They take advantage of platicons generation in normal GVD resonators, which significantly relaxes the material and geometry design restrictions
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影响因子：
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Lin, Qiang
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