Non-linearities introduced by power amplifiers in communication systems have been a subject of interest for industry and academia for a long time. On one hand, the search for increased range intrinsically incites operators to boost input power. On the other hand, this leads to stronger non-linear phenomena in amplifiers, which in turn increase the bit error rate. The situation led to the emergence of digital predistortion algorithms that compensate for the power amplifier's non-linearities and improve the overall performance of the link. A rich corpus of literature exists on this topic but it mainly addresses wireless microwave networks. The case of digital predistortion specifically tailored for optical communications is much less explored. This study focuses on predistortion via filter-lookup-tables and tackles the issue of non-uniform spacing. The work is mainly aimed at coherent optical-orthogonal frequency-division multiplexing systems including low-cost semiconductor optical amplifiers.

中文翻译：

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超低复杂度的滤波器查找表设计，具有不均匀的间距，用于SOA线性化

长期以来，通信系统中功率放大器引入的非线性一直是工业界和学术界关注的主题。一方面，对增加范围的寻求本质上促使运营商提高输入功率。另一方面，这导致放大器中更强的非线性现象，进而增加了误码率。这种情况导致了数字预失真算法的出现，该算法可以补偿功率放大器的非线性并改善链路的整体性能。关于此主题有大量文献，但主要针对无线微波网络。专门针对光通信量身定制的数字预失真的情况很少进行研究。这项研究的重点是通过滤波器查找表进行预失真，并解决了间距不均匀的问题。这项工作主要针对相干光正交频分复用系统，包括低成本的半导体光放大器。