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High spectral efficiency coherent superchannel transmission with soliton microcombs

Mazur, Mikael and Suh, Myoung-Gyun and Fülöp, Attila and Schröder, Jochen and Torres-Company, Victor and Karlsson, Magnus and Vahala, Kerry J. and Andrekson, Peter A. (2021) High spectral efficiency coherent superchannel transmission with soliton microcombs. Journal of Lightwave Technology . ISSN 0733-8724. doi:10.1109/jlt.2021.3073567. (In Press)

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Spectral efficiency (SE) is one of the key metrics for optical communication networks. An important building block for its maximization are optical superchannels, channels that are composed of several subchannels with an aggregate bandwidth larger than the bandwidth of the detector electronics. Superchannels which are routed through the network as a single entity, together with flex-grid routing, allow to more efficiently utilize available bandwidth and eliminate the guard-bands between channels, thus increasing spectral efficiency. In contrast to traditional wavelength division multiplexing (WDM) channels, subchannel spacing and thus superchannel SE is governed by the linewidth and stability of the frequency spacing of the transmitter lasers. Integrated optical frequency combs, particulary the parametrically generated so-called microcombs, which provide optical lines on a fixed frequency grid are a promising solution for low power superchannel laser sources that allow to minimize the SE loss from suboptimal channel spacing. However, it is extremely challenging to realize micro-combs with sufficient line power, coherence and line spacing that is compatible with electronic bandwidths. Because the line-spacing generated by most devices is above 40 GHz, demonstrations often rely on additional electro-optic frequency shifter or divider stages to avoid digital-to-analog-converter (DAC) performance degradation when operating at high symbol rates. Here we demonstrate a 50-line superchannel from a single 22 GHz line spacing soliton microcomb. We demonstrate 12 Tb/s throughput with > 10 bits/s/Hz SE efficiency after 80 km transmission and 8 Tb/s throughput (SE > 6 bits/s/Hz) after 2100 km, proving the feasibility and benefits of generating high signal quality, broadband waveforms directly from the output of a micro-scale device with a symbol rate close to the comb repetition rate.

Item Type:Article
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URLURL TypeDescription Paper
Mazur, Mikael ORCID ID First Name Last Name Other Names Affiliations 0000-0002-2915-9942
Suh, Myoung-Gyun0000-0002-9527-0585
Schröder, Jochen0000-0002-1016-8152
Torres-Company, Victor0000-0002-3504-2118
Karlsson, Magnus0000-0002-2011-0851
Vahala, Kerry J.0000-0003-1783-1380
Alternate Title:Enabling high spectral efficiency coherent superchannel transmission with soliton microcombs
Additional Information:© 2021 IEEE. Chalmers acknowledges funding from the Swedish research council (VR) and the European research council (grant 771410). Caltech acknowledges funding from the Air Force Office of Scientific Research (FA9550-18-1-0353) and the Kavli Nanoscience Institute.
Group:Kavli Nanoscience Institute
Funding AgencyGrant Number
Swedish Research CouncilUNSPECIFIED
European Research Council (ERC)771410
Air Force Office of Scientific Research (AFOSR)FA9550-18-1-0353
Kavli Nanoscience InstituteUNSPECIFIED
Record Number:CaltechAUTHORS:20210416-085952682
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Official Citation:M. Mazur et al., "High spectral efficiency coherent superchannel transmission with soliton microcombs," in Journal of Lightwave Technology, doi: 10.1109/JLT.2021.3073567
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:108753
Deposited By: Tony Diaz
Deposited On:16 Apr 2021 18:45
Last Modified:19 Apr 2021 16:35

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