Optical communication systems have traditionally sent the most information possible through a few spatial channels to minimize cost and maximize density. Energy constraints now compel systems at the longest and shortest distances to employ a new strategy of using more spatial channels, each carrying less data.
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Kahn, J., Miller, D. Communications expands its space. Nature Photon 11, 5–8 (2017). https://doi.org/10.1038/nphoton.2016.256
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DOI: https://doi.org/10.1038/nphoton.2016.256
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