Soliton microcombs are regarded as an ideal platform for applications such as optical communications, optical sensing, low-noise microwave sources, optical atomic clocks, and frequency synthesizers. Many of these applications require a broad comb spectrum that covers an octave, essential for implementing the f − 2f self-referencing techniques. In this work, we have successfully generated an octave-spanning soliton microcomb based on a z-cut thin-film lithium niobate (TFLN) microresonator. This achievement is realized under on-chip optical pumping at 340 mW and through extensive research into the broadening of dual dispersive waves (DWs). Furthermore, the repetition rate of the octave soliton microcomb is accurately measured using an electro-optic comb generated by an x-cut TFLN racetrack microresonator. Our results represent a crucial step toward the realization of practical, integrated, and fully stabilized soliton microcomb systems based on TFLN.

中文翻译：

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铌酸锂微谐振器中的倍频孤子微梳

孤子微梳被认为是光通信、光学传感、低噪声微波源、光学原子钟和频率合成器等应用的理想平台。许多此类应用需要覆盖一个倍频程的宽梳状频谱，这对于实现f − 2 f自参考技术至关重要。在这项工作中，我们成功地生成了基于z切割薄膜铌酸锂 (TFLN) 微谐振器的八度跨度孤子微梳。这一成就是在 340 mW 的片上光泵浦下以及通过对双色散波 (DW) 展宽的广泛研究而实现的。此外，使用x切 TFLN 跑道微谐振器生成的电光梳可以精确测量倍频程孤子微梳的重复率。我们的结果代表了实现基于 TFLN 的实用、集成和完全稳定的孤子微梳系统的关键一步。