Increasing the spectral efficiency of DDO-CE-OFDM systems by multi-objective optimization

Helder Roberto O. de Rocha, Vinicius O.C. Dias, Esequiel da Veiga Pereira, Reginaldo Barbosa Nunes, Marcelo E.V. Segatto, Jair A.L. Silva (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

A multi-objective optimization was implemented to increase the spectral efficiency of direct-detection optical orthogonal frequency division multiplexing (OFDM) systems with constant-envelope (CE) signals. Based on a genetic algorithm, the optimization procedure evaluates the impact of fiber injection power in the reduction of the guard band between the optical carrier and the CE-OFDM signals, optimizing important parameters such as electrical phase modulation and optical modulation indices of the denominated DDO-CE-OFDM system. Simulation results show that a guard-band reduction around 40% was achieved in a 4 Gbps optimized DDO-CE-OFDM system with 16-QAM subcarrier mapping and -7 dBm fiber input power. Results obtained in an experimental proof-of-concept conducted to validate the optimization procedure show that this reduction can reach 66\% according to a power penalty of 2 dB demanded by the inherent spectral broadening of CE-OFDM signals, after propagation over 40 km of standard single-mode fiber.

Original languageEnglish
Article number8640082
Pages (from-to)2155-2162
Number of pages8
JournalJournal of Lightwave Technology
Volume37
Issue number9
DOIs
Publication statusPublished - 1 May 2019

Keywords

  • Constant-envelope optical OFDM
  • multi-objective optimization
  • NSGA II
  • spectral efficiency

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