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High-speed PAM4-based Optical SDM Interconnects with Directly Modulated Long-wavelength VCSEL
Ghent University, Belgium.
KTH Royal Institute of Technology, Sweden.
RISE - Research Institutes of Sweden, ICT, Acreo.ORCID iD: 0000-0001-9839-7488
Huazhong University of Science and Technology, China.
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2018 (English)In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, p. 356-362Article in journal (Refereed) Published
Abstract [en]

This paper reports the demonstration of high-speed PAM-4 transmission using a 1.5-μm single-mode vertical cavity surface emitting laser (SM-VCSEL) over multicore fiber with 7 cores over different distances. We have successfully generated up to 70 Gbaud 4-level pulse amplitude modulation (PAM-4) signals with a VCSEL in optical back-to-back, and transmitted 50 Gbaud PAM-4 signals over both 1-km dispersion-uncompensated and 10-km dispersion-compensated in each core, enabling a total data throughput of 700 Gbps over the 7-core fiber. Moreover, 56 Gbaud PAM-4 over 1-km has also been shown, whereby unfortunately not all cores provide the required 3.8 × 10<formula><tex>$^-3$</tex></formula>bit error rate (BER) for the 7% overhead-hard decision forward error correction (7% OH HDFEC). The limited bandwidth of the VCSEL and the adverse chromatic dispersion of the fiber are suppressed with pre-equalization based on accurate end-to-end channel characterizations. With a digital post-equalization, BER performance below the 7% OH-HDFEC limit is achieved over all cores. The demonstrated results show a great potential to realize high-capacity and compact short-reach optical interconnects for data centers.

Place, publisher, year, edition, pages
2018. p. 356-362
Keywords [en]
Vertical cavity surface emitting lasers, Optical fibers, Optical modulation, Bandwidth, Optical variables measurement, Optical attenuators, Direct detection, digital signal processing (DSP), multicore fiber (MCF), 4-level pulse amplitude modulation (PAM-4), spatial division multiplexing (SDM), vertical cavity surface emitting laser (VCSEL)
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-37659DOI: 10.1109/JLT.2018.2875538OAI: oai:DiVA.org:ri-37659DiVA, id: diva2:1283531
Available from: 2019-01-29 Created: 2019-01-29 Last updated: 2019-05-10Bibliographically approved

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Ozolins, OskarsUdalcovs, Aleksejs

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