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• W2108249158 abstract "We consider the design of compact multisubcarrier constellations for intensity-modulated direct-detected optical systems. The constellations are designed to minimize the average electrical, average optical, and peak optical power for a given minimum distance between constellation points. We formulate the constellation design as a nonconvex optimization problem with second-order cone constraints, (nonconvex) quadratic constraints, and a convex objective function. We show that this problem can be relaxed to a (convex) second-order cone programming (SOCP) problem. We introduce a simple iterative method in which the SOCP relaxation is improved in each iteration. Several numerical simulation examples are provided to illustrate the effectiveness of our method. For the single-subcarrier case, the new constellations are compared with the best known formats in terms of power and spectral efficiency. Our new constellations outperform the corresponding face-centered cubic lattice and quadrature-amplitude-modulation-based constellations, with average electrical and optical power gains in the vicinity of 0.5&#xA0;dB, for low symbol error rates. The corresponding peak optical power gains are also in the vicinity of 0.5&#xA0;dB. By studying the mutual information inherent to the new constellations, we show that the potentials are still valid for coded systems. For the two-subcarrier case, we still outperform two-subcarrier schemes based on conventional constellations and optimized single-subcarrier constellations with the same dimensions." @default.
• W2108249158 created "2016-06-24" @default.
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• W2108249158 date "2014-04-14" @default.
• W2108249158 modified "2023-09-24" @default.
• W2108249158 title "Systematic Method for Designing Constellations for Intensity-Modulated Optical Systems" @default.
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• W2108249158 doi "https://doi.org/10.1364/jocn.6.000449" @default.
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