Journal
NATURE PHOTONICS
Volume 12, Issue 8, Pages 469-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41566-018-0205-5
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Funding
- Silicon Photonics for Optical Communications (SPOC) research center of excellence [DNRF123]
- Nanophotonics for Terabit Communications (NATEC) Villum center of excellence
- European Union-Japan coordinated R&D project on Scalable And Flexible optical Architecture for Reconfigurable Infrastructure (SAFARI)
- European Commission Horizon 2020
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The Internet today transmits hundreds of terabits per second, consumes 9% of all electricity worldwide and grows by 20-30% per year(1,2). To support capacity demand, massively parallel communication links are installed, not scaling favourably concerning energy consumption. A single frequency comb source may substitute many parallel lasers and improve system energy-efficiency(3,4). We present a frequency comb realized by a non-resonant aluminium-gallium-arsenide-oninsulator (AlGaAsOI) nanowaveguide with 66% pump-tocomb conversion efficiency, which is significantly higher than state-of-the-art resonant comb sources. This enables unprecedented high data-rate transmission for chip-based sources, demonstrated using a single-mode 30-core fibre. We show that our frequency comb can carry 661 Tbit s(-1) of data, equivalent to more than the total Internet traffic today. The comb is obtained by seeding the AlGaAsOI chip with 10-GHz picosecond pulses at a low pump power (85 mW), and this scheme is robust to temperature changes, is energy efficient and facilitates future integration with on-chip lasers or amplifiers(5,6).
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