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    Opt Express. 2009 Jun 22;17(13):10814-9.

    Which is the most power-efficient modulation format in optical links?

    Source

    Department of Microtechnology and Nanoscience, Chalmers University of Technology, Göteborg, Sweden. magnus.karlsson@chalmers.se

    Abstract

    By exploiting the electromagnetic wave's four-dimensional signal space, we find that for the additive white Gaussian noise channel, the modulation format with best sensitivity to be an 8-level format with 1.76 dB asymptotic gain over BPSK, for uncoded optical transmission with coherent detection. Low-complexity modulators are presented for the format, as well as an interpretation in terms of quantum-limited sensitivity.

    PMID:
    19550481
    [PubMed]

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