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Strongly nonlinear amplifiers have lower implementation complexity, together with much higher amplification efficiency than linear amplifiers. However, they are only recommendable when the signals at their input have very low envelope fluctuations, something that in general is incompatible with signals with high spectral efficiency (i.e. employing high-order constellations). It is proved, although,...
We address the problem of constellation design for single-subcarrier intensity-modulated direct-detected optical systems. We seek to design constellations that minimize the average electrical power, average optical power and peak optical power for a given minimum Euclidean distance between constellation points. The constellation design is formulated as a nonconvex optimization problem with a convex...
In this letter we consider the design of multi-dimensional compact constellations that minimize the average symbol energy for a given minimum Euclidian distance between constellation points. We formulate the constellation design as a non-convex quadratically constrained quadratic programming. We propose a simple and efficient optimization method, which offers good solutions for small to medium sized...
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