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

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

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  • 1Department of Microtechnology and Nanoscience, Chalmers University of Technology, Göteborg, Sweden.


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.

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