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Modeling and compensation of nonlinear distortion in direct-detection optical Fast-OFDM systems

Vieira, LC; Ozan, W; Mitchell, J; Darwazeh, I; (2022) Modeling and compensation of nonlinear distortion in direct-detection optical Fast-OFDM systems. In: Proceedings of the 2022 13th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP). (pp. pp. 168-173). IEEE: Porto, Portugal. Green open access

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Abstract

Fast-OFDM based intensity-modulation and direct-detection (IM/DD) has been proposed for the deployment of cost-efficient optical access networks, due to simple implementation and high spectral efficiency. In this work, the generalized memory polynomial (GMP) is firstly applied to model the nonlinear characteristic of IM/DD Fast-OFDM links, including memory effects. After model validation using measured data of a 10 km single mode fiber link, the GMP is used for performance investigations of a combined clipping and digital post-distortion approach to optical Fast-OFDM, considering both 4PAM and 8PAM modulation formats and different number of Fast-OFDM subcarriers. This work firstly reports performance results of optical 8PAM-Fast-OFDM systems using 2PAM-based training signals for digital post-distortion and FFT-based channel estimation. Excellent performance improvements are achieved using the proposed distortion compensation scheme, relative to conventional system implementation.

Type: Proceedings paper
Title: Modeling and compensation of nonlinear distortion in direct-detection optical Fast-OFDM systems
Event: 2022 13th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP)
Dates: 20 Jul 2022 - 22 Jul 2022
ISBN-13: 978-1-6654-1044-1
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/CSNDSP54353.2022.9908043
Publisher version: https://doi.org/10.1109/CSNDSP54353.2022.9908043
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Fast-OFDM, IM/DD systems, nonlinear modeling, distortion compensation
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10159062
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