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arXiv · 2508.19910

Experimental End-to-End Optimization of Directly Modulated Laser-based IM/DD Transmission

Sergio Hernandez·Christophe Peucheret·Francesco Da Ros·Darko Zibar
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Abstract

Directly modulated lasers (DMLs) are an attractive technology for short-reach intensity modulation and direct detection communication systems. However, their complex nonlinear dynamics make the modeling and optimization of DML-based systems challenging. In this paper, we study the end-to-end optimization of DML-based systems based on a data-driven surrogate model trained on experimental data. The end-to-end optimization includes the pulse shaping and equalizer filters, the bias current and the modulation radio-frequency (RF) power applied to the laser. The performance of the end-to-end optimization scheme is tested on the experimental setup and compared to 4 different benchmark schemes based on linear and nonlinear receiver-side equalization. The results show that the proposed end-to-end scheme is able to deliver better performance throughout the studied symbol rates and transmission distances while employing lower modulation RF power, fewer filter taps and utilizing a smaller signal bandwidth.

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Sergio Hernandez, Christophe Peucheret, Francesco Da Ros, Darko Zibar. 2025-12-26. Experimental End-to-End Optimization of Directly Modulated Laser-based IM/DD Transmission. https://doi.org/10.1109/jlt.2025.3647350

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