End-to-end optimization of optical communication systems based on directly modulated lasers
The use of directly modulated lasers (DMLs) is attractive in low-power, cost-constrained short-reach optical links. However, their limited modulation bandwidth can induce waveform distortion, undermining their data throughput. Traditional distortion mitigation techniques have relied mainly on the se...
Published in: | Journal of Optical Communications and Networking |
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ftdtupubl:oai:pure.atira.dk:publications/30470d65-2a18-41e8-9407-8539f3fdc27e 2024-09-15T18:03:49+00:00 End-to-end optimization of optical communication systems based on directly modulated lasers Hernandez, Sergio Peucheret, Christophe Da Ros, Francesco Zibar, Darko 2024-08-01 https://orbit.dtu.dk/en/publications/30470d65-2a18-41e8-9407-8539f3fdc27e https://doi.org/10.1364/JOCN.522761 eng eng https://orbit.dtu.dk/en/publications/30470d65-2a18-41e8-9407-8539f3fdc27e info:eu-repo/semantics/closedAccess Hernandez , S , Peucheret , C , Da Ros , F & Zibar , D 2024 , ' End-to-end optimization of optical communication systems based on directly modulated lasers ' , Journal of Optical Communications and Networking , vol. 16 , no. 8 , pp. D29-D43 . https://doi.org/10.1364/JOCN.522761 article 2024 ftdtupubl https://doi.org/10.1364/JOCN.522761 2024-07-29T23:50:18Z The use of directly modulated lasers (DMLs) is attractive in low-power, cost-constrained short-reach optical links. However, their limited modulation bandwidth can induce waveform distortion, undermining their data throughput. Traditional distortion mitigation techniques have relied mainly on the separate training of transmitter-side pre-distortion and receiver-side equalization. This approach overlooks the potential gains obtained by simultaneous optimization of the transmitter (constellation and pulse shaping) and receiver (equalization and symbol demapping). Moreover, in the context of DML operation, the choice of laser-driving configuration parameters such as the bias current and peak-to-peak modulation current has a significant impact on system performance. We propose, to our knowledge, a novel end-to-end optimization approach for DML systems, incorporating the learning of bias and peak-to-peak modulation current to the optimization of constellation points, pulse shaping, and equalization. The simulation of the DML dynamics is based on the use of the laser rate equations at symbol rates between 15 and 25 Gbaud. The resulting output sequences from the rate equations are used to build a differentiable data-driven model, simplifying the calculation of gradients needed for end-to-end optimization. The proposed end-to-end approach is compared to three additional benchmark approaches: the uncompensated system without equalization, a receiver-side finite impulse response equalization approach, and an end-to-end approach with learnable pulse shape and nonlinear Volterra equalization but fixed bias and peak-to-peak modulation current. The numerical simulations on the four approaches show that the joint optimization of bias, peak-to-peak current, constellation points, pulse shaping, and equalization outperforms all other approaches throughout the tested symbol rates. Article in Journal/Newspaper DML Technical University of Denmark: DTU Orbit Journal of Optical Communications and Networking 16 8 D29 |
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Open Polar |
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Technical University of Denmark: DTU Orbit |
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ftdtupubl |
language |
English |
description |
The use of directly modulated lasers (DMLs) is attractive in low-power, cost-constrained short-reach optical links. However, their limited modulation bandwidth can induce waveform distortion, undermining their data throughput. Traditional distortion mitigation techniques have relied mainly on the separate training of transmitter-side pre-distortion and receiver-side equalization. This approach overlooks the potential gains obtained by simultaneous optimization of the transmitter (constellation and pulse shaping) and receiver (equalization and symbol demapping). Moreover, in the context of DML operation, the choice of laser-driving configuration parameters such as the bias current and peak-to-peak modulation current has a significant impact on system performance. We propose, to our knowledge, a novel end-to-end optimization approach for DML systems, incorporating the learning of bias and peak-to-peak modulation current to the optimization of constellation points, pulse shaping, and equalization. The simulation of the DML dynamics is based on the use of the laser rate equations at symbol rates between 15 and 25 Gbaud. The resulting output sequences from the rate equations are used to build a differentiable data-driven model, simplifying the calculation of gradients needed for end-to-end optimization. The proposed end-to-end approach is compared to three additional benchmark approaches: the uncompensated system without equalization, a receiver-side finite impulse response equalization approach, and an end-to-end approach with learnable pulse shape and nonlinear Volterra equalization but fixed bias and peak-to-peak modulation current. The numerical simulations on the four approaches show that the joint optimization of bias, peak-to-peak current, constellation points, pulse shaping, and equalization outperforms all other approaches throughout the tested symbol rates. |
format |
Article in Journal/Newspaper |
author |
Hernandez, Sergio Peucheret, Christophe Da Ros, Francesco Zibar, Darko |
spellingShingle |
Hernandez, Sergio Peucheret, Christophe Da Ros, Francesco Zibar, Darko End-to-end optimization of optical communication systems based on directly modulated lasers |
author_facet |
Hernandez, Sergio Peucheret, Christophe Da Ros, Francesco Zibar, Darko |
author_sort |
Hernandez, Sergio |
title |
End-to-end optimization of optical communication systems based on directly modulated lasers |
title_short |
End-to-end optimization of optical communication systems based on directly modulated lasers |
title_full |
End-to-end optimization of optical communication systems based on directly modulated lasers |
title_fullStr |
End-to-end optimization of optical communication systems based on directly modulated lasers |
title_full_unstemmed |
End-to-end optimization of optical communication systems based on directly modulated lasers |
title_sort |
end-to-end optimization of optical communication systems based on directly modulated lasers |
publishDate |
2024 |
url |
https://orbit.dtu.dk/en/publications/30470d65-2a18-41e8-9407-8539f3fdc27e https://doi.org/10.1364/JOCN.522761 |
genre |
DML |
genre_facet |
DML |
op_source |
Hernandez , S , Peucheret , C , Da Ros , F & Zibar , D 2024 , ' End-to-end optimization of optical communication systems based on directly modulated lasers ' , Journal of Optical Communications and Networking , vol. 16 , no. 8 , pp. D29-D43 . https://doi.org/10.1364/JOCN.522761 |
op_relation |
https://orbit.dtu.dk/en/publications/30470d65-2a18-41e8-9407-8539f3fdc27e |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1364/JOCN.522761 |
container_title |
Journal of Optical Communications and Networking |
container_volume |
16 |
container_issue |
8 |
container_start_page |
D29 |
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1810441274950418432 |