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Synchronous subnanosecond clock and data recovery for optically switched data centres using clock phase caching

Clark, KA; Cletheroe, D; Gerard, T; Haller, I; Jozwik, K; Shi, K; Thomsen, B; ... Liu, Z; + view all (2020) Synchronous subnanosecond clock and data recovery for optically switched data centres using clock phase caching. Nature Electronics , 3 pp. 426-433. 10.1038/s41928-020-0423-y. Green open access

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Abstract

The rapid growth in the amount of data being transferred within data centres, combined with the slowdown in Moore’s Law, creates challenges for the future scalability of electronically switched data-centre networks. Optical switches could offer a future-proof alternative, and photonic integration platforms have been demonstrated with nanosecond-scale optical switching times. End-to-end switching time is, however, currently limited by the clock and data recovery time, which typically takes microseconds, removing the benefits of nanosecond optical switching. Here we show that a clock phase caching technique can provide clock and data recovery times of under 625 ps (16 symbols at 25.6 Gb s−1). Our approach uses the measurement and storage of clock phase values in a synchronized network to simplify clock and data recovery versus conventional asynchronous approaches. We demonstrate the capabilities of our technique using a real-time prototype with commercial transceivers and validate its resilience against temperature variation and clock jitter.

Type: Article
Title: Synchronous subnanosecond clock and data recovery for optically switched data centres using clock phase caching
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/s41928-020-0423-y
Publisher version: https://doi.org/10.1038/s41928-020-0423-y
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Electrical and electronic engineering, Fibre optics and optical communications
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10102173
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