
2048-QAM transmission at 15 GBd over 100 km using geometric constellation shaping
Author(s) -
Yuta Wakayama,
Thomas Gerard,
Eric Sillekens,
L Galdino,
Domaniç Lavery,
Robert I. Killey,
Polina Bayvel
Publication year - 2021
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.423361
Subject(s) - quadrature amplitude modulation , transmission (telecommunications) , digital signal processing , optics , free space optical communication , qam , computer science , optical communication , modulation (music) , data transmission , electronic engineering , transmission system , constellation , telecommunications , physics , bit error rate , computer hardware , engineering , decoding methods , acoustics , astronomy
We experimentally investigated a pilot-aided digital signal processing (DSP) chain in combination with high-order geometric constellation shaping to increase the achievable information rates (AIRs) in standard intradyne coherent transmission systems. We show that the AIR of our system at 15 GBd was maximised using geometrically-shaped (GS) 2048 quadrature amplitude modulation (QAM), reaching 18.0 b/4D-symbol in back-to-back transmission and 16.9 b/4D-symbol after transmission through 100 km of a single-mode fibre after subtracting the pilot overhead (OH). This represents the highest-order GS format demonstrated to date, supporting the highest AIR of any standard intradyne system using conventional optics and 8-bit electronics. Detailed characterisation of the DSP, transceiver performance, and transmission modelling has also been carried out to provide insight into sources of impairments and directions for further improvement.