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Rate Adaptability Using LUT-Based Distribution Matching for Probabilistic Constellation Shaping

Ferreira, R. M. ; Guiomar, F. P. ; Pissarra, P. ; Fernandes, M. ; Brandão, B. ; Messias, A. C. ; Formiga, D. A. ; Rodrigues, M. M. ; Vilela, T. M. ; Monteiro, P. ; Rodrigues, F. ; Teixeira, A. ; Reis, J.D.

IEEE Photonics Technology Letters Vol. 33, Nº 3, pp. 143 - 146, February, 2021.

ISSN (print): 1041-1135
ISSN (online): 1041-1135

Journal Impact Factor: 2,110 (in 2014)

Digital Object Identifier: 10.1109/LPT.2020.3045849

Abstract
We investigate the flexibility of a LUT-based hierarchical DM for Probabilistic Constellation Shaping providing flexible net bit rates. Using a fixed parallelized input and output LUT-based architecture, including a flexible strategy to organize the input bits in each LUT, the proposed scheme shows an efficient performance in terms of rate loss vs. complexity, resulting in a DM solution to enable flexible bit rates with improved channel transmission. We use an 800G example design with soft-decision FEC to discuss the optimization strategy and to demonstrate the flexibility of the proposed method, enabling a high granularity bit rate operation in the range of 160 to 800 Gb/s with a rate loss always below 0.14 bits/symbol.