Abstract
Super-PON is a 16-wavelength passive optical network with 50 km reach and 64 ONUs per \(\lambda\), providing up to 10 Gb/s to sparsely populated areas. To bridge its challenging loss-budget, Super-PON includes an EDFA located next to the OLT, thus compromising transceiver integration and future spectral expansion. An alternative for downstream transmission consists in using a powerful directly-modulated semiconductor optical amplifier (SOA) and an avalanche photodiode. Here, we numerically demonstrate the technical feasibility of this proposal. By combining a sensitivity of − 24.9 dBm and an optimized SOA transmitter output of +19.4 dBm, error-free (BER \(\le\) 3.8x10\(^{-3}\)) transmission is demonstrated. This achievement relies on the use of PAM-4 modulation to combat the limited opto-electronic bandwidth of the SOA, and Tomlinson-Harashima precoding (THP) to mitigate fiber transmission and receiver impairments. It is also shown that THP enhances the direct modulation capability of SOAs, leveraging their use in integrated transceivers aimed for high-loss photonic systems.
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The datasets generated during the current study are available from the corresponding author upon reasonable request.
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Acknowledgements
This work was supported by Dirección General Asuntos Personal Académico - UNAM through PAPIIT project IN103122. We are indebted to VPIphotonics University Program. We are grateful to A. Martínez Lorenzana for her technical support.
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JML Formal analysis, software, writing original draft. RGC Conceptualization, Methodology, Formal analysis, Writing original draft, Supervision, Funding acquisition. DECH formal analysis, writing - review and editing, funding acquisition.
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Molina-Luna, J., Gutiérrez-Castrejón, R. & Ceballos-Herrera, D.E. Alternative to Super-PON downstream transmitter using a directly-modulated SOA. Opt Quant Electron 54, 830 (2022). https://doi.org/10.1007/s11082-022-04159-9
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DOI: https://doi.org/10.1007/s11082-022-04159-9