Broadband soliton microcombs in the biological window enabled by a resonant coupler

Abstract

Broadband soliton microcombs near 1 μm offer coherent, evenly spaced optical lines for measurements in the biological window. However, combining broad spectral coverage with closely spaced comb lines increases the pump-power requirement and makes thermally stable soliton access more difficult. Here, we demonstrate broadband silicon nitride (Si3N4) soliton microcombs enabled by a resonant coupler that enhances pump delivery to the nonlinear resonator. The device generates a spectrum spanning 930-1380 nm with an approximately 98-GHz comb-line spacing at on-chip pump powers of tens of milliwatts, while providing reliable thermally stable access to the single-soliton state. These results provide a route to compact, power-efficient microcomb sources that combine broad spectral coverage with closely spaced comb lines for spectroscopy and imaging in the biological window.

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BibTeX RIS

BibTeX

@misc{luo2026broadband,
  title = {{Broadband soliton microcombs in the biological window enabled by a resonant coupler}},
  author = {Xinrui Luo and Du Qian and Yuanlei Wang and Yiwen Yang and Kaixuan Zhu and Yinke Cheng and Haoyang Luo and Junqi Wang and Bei-Bei Li and Qihuang Gong and Qi-Fan Yang},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.12603},
  eprint = {2610.12603},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.12603},
}

RIS

TY  - UNPB
TI  - Broadband soliton microcombs in the biological window enabled by a resonant coupler
AU  - Xinrui Luo
AU  - Du Qian
AU  - Yuanlei Wang
AU  - Yiwen Yang
AU  - Kaixuan Zhu
AU  - Yinke Cheng
AU  - Haoyang Luo
AU  - Junqi Wang
AU  - Bei-Bei Li
AU  - Qihuang Gong
AU  - Qi-Fan Yang
PY  - 2026
DA  - 2026/10/08
PB  - arXiv
DO  - 10.48550/arxiv.2610.12603
UR  - https://arxiv.org/abs/2610.12603
AB  - Broadband soliton microcombs near 1 μm offer coherent, evenly spaced optical lines for measurements in the biological window. However, combining broad spectral coverage with closely spaced comb lines increases the pump-power requirement and makes thermally stable soliton access more difficult. Here, we demonstrate broadband silicon nitride (Si3N4) soliton microcombs enabled by a resonant coupler that enhances pump delivery to the nonlinear resonator. The device generates a spectrum spanning 930-1380 nm with an approximately 98-GHz comb-line spacing at on-chip pump powers of tens of milliwatts, while providing reliable thermally stable access to the single-soliton state. These results provide a route to compact, power-efficient microcomb sources that combine broad spectral coverage with closely spaced comb lines for spectroscopy and imaging in the biological window.
ER  -

Abstract

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