The adoption of sophisticated phase-shift modulation schemes could make optical communication at 100 Gbit s−1 a reality within the next couple of years, but this is ultimately dependent on the deployment costs involved.
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Won, R. A question of cost. Nature Photon 4, 80–81 (2010). https://doi.org/10.1038/nphoton.2009.281
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DOI: https://doi.org/10.1038/nphoton.2009.281
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