Geng Yong, Cui Wenwen, Sun Jingwen, Chen Xinxin, Yin Xiaojie, Deng Guangwei, Zhou Qiang, Zhou Heng
Opt Lett. 2020 Sep 15;45(18):5073-5076. doi: 10.1364/OL.400656.
A temporal dissipative Kerr soliton (DKS) frequency comb can be generated in an optical micro-cavity relying on the rigid balance between cavity decay (dispersion) and parametric gain (nonlinear phase modulation) induced by an intense pump laser. In practice, to maintain such delicate double balances experienced by the intracavity soliton pulses, it requires precise control of the pump laser frequency and power, as well as the micro-cavity parameters. However, to date there still lacks experimental demonstration that simultaneously stabilizes all these key parameters to enhance the long-term DKS stability. Here, we demonstrate continuous working of a on-chip DKS microcomb for a record-breaking 14 days without showing any sign of breakdown. Such improved microcomb stability is enabled mainly by robust pump power coupling to the micro-cavity utilizing packaged planar-lightwave-circuit mode converters, and faithful locking of the pump frequency detuning via an auxiliary laser heating method. In addition to superior stability, the demonstrated DKS microcomb system also achieves favorable compactness, with all the accessory modules being assembled into a standard 4U case. We hope that our demonstration could prompt the practical utilization of Kerr microcombs in real-world applications.
通过强泵浦激光诱导的腔损耗（色散）和参量增益（非线性相位调制）之间的严格平衡，可以在光学微腔中产生时间耗散克尔孤子（DKS）频率梳。实际上，为了维持腔内孤子脉冲所经历的这种微妙的双重平衡，需要精确控制泵浦激光的频率和功率以及微腔参数。然而，迄今为止，仍缺乏将所有这些关键参数同时稳定以提高DKS长期稳定性的实验证明。在此，我们展示了片上DKS微梳连续工作14天，创纪录且无任何故障迹象。这种改进的微梳稳定性主要通过利用封装的平面光波电路模式转换器将泵浦功率稳健地耦合到微腔，并通过辅助激光加热方法精确锁定泵浦频率失谐来实现。除了卓越的稳定性外，所展示的DKS微梳系统还具有良好的紧凑性，所有附属模块都组装在一个标准的4U机箱中。我们希望我们的展示能够推动克尔微梳在实际应用中的实际应用。
