Digital Nonlinearity Compensation Techniques for Unrepeatered Optical Systems

José Hélio da Cruz Júnior, Tiago Sutili, Lucas Silva Schanner, Sandro M. Rossi, Rafael C. Figueiredo

DOI: 10.14209/SBRT.2020.1570658398

Evento: XXXVIII Simpósio Brasileiro de Telecomunicações e Processamento de Sinais (SBrT2020)

Keywords: Digital back-propagation Maximum likelihood sequence estimation Nonlinear compensation Unrepeatered systems

Abstract

In this paper, we experimentally investigate the performance of unrepeatered optical transmission comparing different nonlinear compensation (NLC) implementations. Specifically, digital back-propagation (DBP) algorithm and maximum likelihood sequence estimation (MLSE) are applied for intra-channel NLC with and without 4x4 multiple-input multiple-output (MIMO) equalization. Both NLC algorithms are evaluated in an unrepeatered WDM transmission of 17x200-Gb/s channels (32 GBd DP-16QAM) over 350 km of large effective area and low loss single-mode fibers. The results indicate a Q^2 factor and optimum launch power improvements of up to 0.4 dB and 2 dB, respectively, compared to the linear compensation (LC), combining MLSE and DBP with MIMO equalization.

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