Integrated broadband optical isolator via dynamic rotating destructive interference
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arXiv
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| Auteurs principaux: | , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866908516964368384 |
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| author | Han, Kyunghun Bao, Yiliang Song, Junyeob Long, David Bresler, Sean Westly, Daron Gorman, Jason LeBrun, Thomas Srinivasan, Kartik Aksyuk, Vladimir |
| author_facet | Han, Kyunghun Bao, Yiliang Song, Junyeob Long, David Bresler, Sean Westly, Daron Gorman, Jason LeBrun, Thomas Srinivasan, Kartik Aksyuk, Vladimir |
| contents | Photonic integrated circuits route and shape light on a chip, but back-reflections feed back into coherent on-chip lasers, destabilizing operation and corrupting signals. Robust operation requires an integrated optical isolator that strongly suppresses backward propagation while maintaining low-loss, broadband forward transmission. However, prior on-chip isolators rely on magneto-optic materials or resonance-based filters, which respectively demand non-standard processes or inherently constrain bandwidth. Here, we propose and experimentally demonstrate a traveling-wave optical isolator without magnetic materials or resonant elements. By driving four parallel optical channels with periodic RF waves, we realize dynamic rotating destructive interference that continuously cancels backward-propagating light while leaving forward-propagating light unaffected. We achieve about 30 dB isolation at a wavelength of 789.7 nm and maintain over 24 dB isolation across an approximately 30 nm bandwidth (770 nm to 800 nm), including >20 dB isolation for two simultaneous lasers within an approximately 10 nm wavelength window. This wavelength span covers key alkali atomic transitions, enabling strong suppression of feedback-induced frequency noise and laser instability in atomic spectroscopy, laser cooling, and locking applications. We demonstrate a practical, broadband on-chip isolator applicable from the visible to the near-infrared, which is a crucial step toward fully integrated photonic platforms. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_02866 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Integrated broadband optical isolator via dynamic rotating destructive interference Han, Kyunghun Bao, Yiliang Song, Junyeob Long, David Bresler, Sean Westly, Daron Gorman, Jason LeBrun, Thomas Srinivasan, Kartik Aksyuk, Vladimir Optics Photonic integrated circuits route and shape light on a chip, but back-reflections feed back into coherent on-chip lasers, destabilizing operation and corrupting signals. Robust operation requires an integrated optical isolator that strongly suppresses backward propagation while maintaining low-loss, broadband forward transmission. However, prior on-chip isolators rely on magneto-optic materials or resonance-based filters, which respectively demand non-standard processes or inherently constrain bandwidth. Here, we propose and experimentally demonstrate a traveling-wave optical isolator without magnetic materials or resonant elements. By driving four parallel optical channels with periodic RF waves, we realize dynamic rotating destructive interference that continuously cancels backward-propagating light while leaving forward-propagating light unaffected. We achieve about 30 dB isolation at a wavelength of 789.7 nm and maintain over 24 dB isolation across an approximately 30 nm bandwidth (770 nm to 800 nm), including >20 dB isolation for two simultaneous lasers within an approximately 10 nm wavelength window. This wavelength span covers key alkali atomic transitions, enabling strong suppression of feedback-induced frequency noise and laser instability in atomic spectroscopy, laser cooling, and locking applications. We demonstrate a practical, broadband on-chip isolator applicable from the visible to the near-infrared, which is a crucial step toward fully integrated photonic platforms. |
| title | Integrated broadband optical isolator via dynamic rotating destructive interference |
| topic | Optics |
| url | https://arxiv.org/abs/2509.02866 |