Abstract
The transition to chaos is ubiquitous in nonlinear systems ranging from fluid dynamics and superconducting circuits to biological organisms. Optical systems driven out of equilibrium such as lasers and supercontinuum generation exhibit chaotic states of light with fluctuations in both amplitude and phase and can give rise to Levy statistics, turbulence and rogue waves. Spatiotemporal chaos also occurs in continuous-wave-driven photonic-chip-based Kerr microresonators, where it is referred to as chaotic modulation instability. Such modulation instability states have generally been considered impractical for applications, in contrast to their coherent-light-state counterparts, which include soliton or dark-pulse states. Here we demonstrate that incoherent and chaotic states of light in an optical microresonator can be harnessed to implement unambiguous and interference-immune massively parallel coherent laser ranging by using the intrinsic random amplitude and phase modulation of the chaotic comb lines. We utilize 40 distinct lines of a microresonator frequency comb operated in the modulation instability regime. Each line carries >1 GHz noise bandwidth, which greatly surpasses the cavity linewidth, and enables to retrieve the distance of objects with centimetre-scale resolution. Our approach utilizes one of the most widely accessible microcomb states, and offers—in contrast to dissipative Kerr soliton states—high conversion efficiency, as well as flat optical spectra, and alleviates the need for complex laser initiation routines. Moreover the approach generates wideband signal modulation without requiring any electro-optical modulator or microwave synthesizer. Viewed more broadly, similar optical systems capable of chaotic dynamics could be applied to random-modulation optical ranging as well as spread-spectrum communication, optical cryptography and random number generation.
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Data availability
The data used to produce the plots within this paper are available via Zenodo at https://doi.org/10.5281/zenodo.7843656 (ref. 68).
Code availability
The code used to produce the plots within this paper is available via Zenodo at https://doi.org/10.5281/zenodo.7843656 (ref. 68).
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Acknowledgements
We thank A. Tikan for valuable comments and discussions. This Article is based upon work supported by the Air Force Office of Scientific Research under award no. FA8655-21-1-7064. The work was also supported by the Swiss National Science Foundation (SNF) under contract no. 192293. A.L. acknowledges support from the European Space Technology Centre with ESA contract no. 4000133568/20/NL/MH/hm. J.R. acknowledges support from the Swiss National Science Foundation under grant no. 201923 (Ambizione). A.T. acknowledges support from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement no. 812818 (MICROCOMB). The Si3N4 samples were fabricated in the EPFL Center of MicroNanoTechnology (CMi).
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A.L. and J.R. conceived and developed the idea. A.L. conducted the various experiments and analysed the data. A.L. designed the samples. J.L. fabricated the samples. J.R. characterized the samples. A.T. performed the numerical simulations. T.J.K. supervised the work. A.L., A.T., J.R. and T.J.K wrote the manuscript.
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T.J.K. is a co-founder and shareholder of LiGenTec SA, a start-up company that is engaged in making Si3N4 nonlinear photonic chips available via foundry service. The other authors declare no competing interests.
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Lukashchuk, A., Riemensberger, J., Tusnin, A. et al. Chaotic microcomb-based parallel ranging. Nat. Photon. 17, 814–821 (2023). https://doi.org/10.1038/s41566-023-01246-5
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DOI: https://doi.org/10.1038/s41566-023-01246-5
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