Co-propagating a signal with its phase conjugate along an optical fibre link makes it possible to mitigate unwanted nonlinear distortions and improve the signal-to-noise ratio in long-haul optical communication systems.
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Ip, E., Kahn, J. Time-reversed twin. Nature Photon 7, 507–508 (2013). https://doi.org/10.1038/nphoton.2013.155
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DOI: https://doi.org/10.1038/nphoton.2013.155