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A two-dimensional signal space for intensity-modulated channels is presented. Modulation formats using this signal space are designed to minimize average and peak power for a fixed minimum distance between signal points. The uncoded, high-signal-to-noise ratio, power and spectral efficiencies are compared to those of the best known formats. The new formats are simpler than existing subcarrier formats,...
The problem of evaluating the maximum possible rate of information transmission in fibre-optic communication systems is discussed. A spectral efficiency of ∼7 bits/s/Hz over 1000 km in one polarization is shown to be theoretically achievable.
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