Broadband microwave-rate dark pulse microcombs in dissipation-engineered LiNbO$_3$ microresonators
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arXiv
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| Autores principales: | , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| Materias: | |
| Acceso en línea: | |
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| _version_ | 1866917654504144896 |
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| author | Lv, Xiaomin Nie, Binbin Yang, Chen Ma, Rui Wang, Ze Liu, Yanwu Jin, Xing Zhu, Kaixuan Chen, Zhenyu Qian, Du Zhang, Guanyu Lv, Guowei Gong, Qihuang Bo, Fang Yang, Qi-Fan |
| author_facet | Lv, Xiaomin Nie, Binbin Yang, Chen Ma, Rui Wang, Ze Liu, Yanwu Jin, Xing Zhu, Kaixuan Chen, Zhenyu Qian, Du Zhang, Guanyu Lv, Guowei Gong, Qihuang Bo, Fang Yang, Qi-Fan |
| contents | Kerr microcombs generated in optical microresonators provide broadband light sources bridging optical and microwave signals. Their translation to thin-film lithium niobate unlocks second-order nonlinear optical interfaces such as electro-optic modulation and frequency doubling for completing comb functionalities. However, the strong Raman response of LiNbO$_3$ has complicated the formation of Kerr microcombs. Until now, dark pulse microcombs, requiring a double balance between Kerr nonlinearity and normal group velocity dispersion as well as gain and loss, have remained elusive in LiNbO$_3$ microresonators. Here, by incorporating dissipation engineering, we demonstrate dark pulse microcombs with 25 GHz repetition frequency and 200 nm span in a high-$Q$ LiNbO$_3$ microresonator. Resonances near the Raman-active wavelengths are strongly damped by controlling phase-matching conditions of a specially designed pulley coupler. The coherence and tunability of the dark pulse microcombs are also investigated. Our work provides a solution to realize high-power microcombs operating at microwave rates on LiNbO$_3$ chips, promising new opportunities for the monolithic integration of applications spanning communication to microwave photonics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_19584 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Broadband microwave-rate dark pulse microcombs in dissipation-engineered LiNbO$_3$ microresonators Lv, Xiaomin Nie, Binbin Yang, Chen Ma, Rui Wang, Ze Liu, Yanwu Jin, Xing Zhu, Kaixuan Chen, Zhenyu Qian, Du Zhang, Guanyu Lv, Guowei Gong, Qihuang Bo, Fang Yang, Qi-Fan Optics Kerr microcombs generated in optical microresonators provide broadband light sources bridging optical and microwave signals. Their translation to thin-film lithium niobate unlocks second-order nonlinear optical interfaces such as electro-optic modulation and frequency doubling for completing comb functionalities. However, the strong Raman response of LiNbO$_3$ has complicated the formation of Kerr microcombs. Until now, dark pulse microcombs, requiring a double balance between Kerr nonlinearity and normal group velocity dispersion as well as gain and loss, have remained elusive in LiNbO$_3$ microresonators. Here, by incorporating dissipation engineering, we demonstrate dark pulse microcombs with 25 GHz repetition frequency and 200 nm span in a high-$Q$ LiNbO$_3$ microresonator. Resonances near the Raman-active wavelengths are strongly damped by controlling phase-matching conditions of a specially designed pulley coupler. The coherence and tunability of the dark pulse microcombs are also investigated. Our work provides a solution to realize high-power microcombs operating at microwave rates on LiNbO$_3$ chips, promising new opportunities for the monolithic integration of applications spanning communication to microwave photonics. |
| title | Broadband microwave-rate dark pulse microcombs in dissipation-engineered LiNbO$_3$ microresonators |
| topic | Optics |
| url | https://arxiv.org/abs/2404.19584 |