Single-source chip-based frequency comb enabling extreme parallel data transmission

Hao Hu*, Francesco Da Ros, Minhao Pu, Feihong Ye, Kasper Ingerslev, Edson Porto da Silva, Md Nooruzzaman, Yoshimichi Amma, Yusuke Sasaki, Takayuki Mizuno, Yutaka Miyamoto, Luisa Ottaviano, Elizaveta Semenova, Pengyu Guan, Darko Zibar, Michael Galili, Kresten Yvind, Toshio Morioka, Leif Katsuo Oxenløwe

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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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).
Original languageEnglish
JournalNature Photonics
Issue number8
Pages (from-to)469-74
Publication statusPublished - 2018


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