290544
doi
10.5281/zenodo.290544
oai:zenodo.org:290544
user-eu
Paraskevas Bakopoulos
Photonics Communications Research Laboratory, National Technical University of Athens
Nikolaos Argyris
Photonics Communications Research Laboratory, National Technical University of Athens
Christos Spatharakis
Photonics Communications Research Laboratory, National Technical University of Athens
Hercules Avramopoulos
Photonics Communications Research Laboratory, National Technical University of Athens
Scaling single-wavelength optical interconnects to 180 Gb/s with PAM-M and pulse shaping
Stefanos Dris
Photonics Communications Research Laboratory, National Technical University of Athens
info:eu-repo/semantics/openAccess
Creative Commons Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/legalcode
<p>Faced with surging datacenter traffic demand, system designers are turning to multi-level optical modulation with direct detection as the means of reaching 100 Gb/s in a single optical lane; a further upgrade to 400 Gb/s is envisaged through wavelength-multiplexing of multiple 100 Gb/s strands. In terms of modulation formats, PAM-4 and PAM-8 are considered the front-runners, striking a good balance between bandwidth-efficiency and implementation complexity. In addition, the emergence of energy-efficient, high-speed CMOS digital-to-analog converters (DACs) opens up new possibilities: Spectral shaping through digital filtering will allow squeezing even more data through low-cost, low-bandwidth electro-optic components. In this work we demonstrate an optical interconnect based on an EAM that is driven directly with sub-volt electrical swing by a 65 GSa/s arbitrary waveform generator (AWG). Low-voltage drive is particularly attractive since it allows direct interfacing with the switch/server ASIC, eliminating the need for dedicated, power-hungry and expensive electrical drivers. Single-wavelength throughputs of 180 and 120 Gb/s are experimentally demonstrated with 60 Gbaud optical PAM-8 and PAM-4 respectively. Successful transmission over 1250 m SMF is achieved with direct-detection, using linear equalization via offline digital signal processing in order to overcome the strong bandwidth limitation of the overall link (~20 GHz). The suitability of Nyquist pulse shaping for optical interconnects is also investigated experimentally with PAM-4 and PAM-8, at a lower symbol rate of 40 Gbaud (limited by the sampling rate of the AWG). To the best of our knowledge, the rates achieved are the highest ever using optical PAM-M formats.</p>
Zenodo
2016-03-07
info:eu-repo/semantics/conferencePaper
773548
user-eu
award_title=eNd to End scalable and dynamically reconfigurable oPtical arcHitecture for application-awarE SDN cLoud datacentErs; award_number=645212; award_identifiers_scheme=url; award_identifiers_identifier=https://cordis.europa.eu/projects/645212; funder_id=00k4n6c32; funder_name=European Commission;
1579539653.861963
1266436
md5:7533b8c1d937cb287f6ac48b8cac0849
https://zenodo.org/records/290544/files/Scaling single-wavelength optical interconnects to 180 Gbs with PAM-M and pulse shaping.pdf
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