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<p>The drive to miniaturize optical frequency combs for practical deployment has spotlighted microresonator solitons as a promising chip-scale candidate. However, these soliton microcombs could be very power-hungry when their span increases, especially with fine comb spacings. As a result, realizing an octave-spanning comb at microwave repetition rates for direct optical-microwave linkage is considered not possible for photonic integration due to the high power requirements. Here, we introduce the concept of resonant-coupling to soliton microcombs to reduce pump consumption significantly. Compared to conventional waveguide-coupled designs, we demonstrate (i) a threefold increase in spectral span for high-power combs and (ii) up to a tenfold reduction in repetition frequency for octave-spanning operation. This configuration is compatible with laser integration and yields reliable, turnkey soliton generation. By eliminating the long-standing pump-power bottleneck, microcombs will soon become readily available for portable optical clocks, massively parallel data links, and field-deployable spectrometers.</p>

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Power-efficient ultra-broadband soliton microcombs in resonantly-coupled microresonators

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月30日

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  • Kaixuan Zhu,
  • Xinrui Luo,
  • Yuanlei Wang,
  • Ze Wang,
  • Tianyu Xu,
  • Du Qian,
  • Yinke Cheng,
  • Junqi Wang,
  • Haoyang Luo,
  • Yanwu Liu,
  • Xing Jin,
  • Zhenyu Xie,
  • Xin Zhou,
  • Min Wang,
  • Jian-Fei Liu,
  • Xuening Cao,
  • Ting Wang,
  • Shui-Jing Tang,
  • Qihuang Gong,
  • Bei-Bei Li,
  • Qi-Fan Yang

摘要

The drive to miniaturize optical frequency combs for practical deployment has spotlighted microresonator solitons as a promising chip-scale candidate. However, these soliton microcombs could be very power-hungry when their span increases, especially with fine comb spacings. As a result, realizing an octave-spanning comb at microwave repetition rates for direct optical-microwave linkage is considered not possible for photonic integration due to the high power requirements. Here, we introduce the concept of resonant-coupling to soliton microcombs to reduce pump consumption significantly. Compared to conventional waveguide-coupled designs, we demonstrate (i) a threefold increase in spectral span for high-power combs and (ii) up to a tenfold reduction in repetition frequency for octave-spanning operation. This configuration is compatible with laser integration and yields reliable, turnkey soliton generation. By eliminating the long-standing pump-power bottleneck, microcombs will soon become readily available for portable optical clocks, massively parallel data links, and field-deployable spectrometers.