Open AccessVery low‐complexity filter lookup‐table design with non‐uniform spacing for SOA linearisation
Author(s) -
Younes Mohamad,
Telescu Mihai,
Azou Stéphane,
Morel Pascal,
Tanguy Noël
Publication year - 2020
Publication title -
iet optoelectronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.379
H-Index - 42
eISSN - 1751-8776
pISSN - 1751-8768
DOI - 10.1049/iet-opt.2019.0044
Subject(s) - predistortion , lookup table , electronic engineering , amplifier , computer science , multiplexing , filter (signal processing) , optical amplifier , orthogonal frequency division multiplexing , table (database) , telecommunications , electrical engineering , bandwidth (computing) , engineering , optics , physics , laser , channel (broadcasting) , computer vision , programming language , data mining
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.