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Leveraging Dispersion-Aware Phase Recovery for Long-Haul Digital Multi-Carrier Transmission: An Experimental Demonstration

Neves, M. S. ; Lorences-Riesgo, A. ; Martins, C. M. ; Mumtaz, S. ; Frignac, Y. ; Charlet, G. ; Monteiro, P. ; Dris, S. ; Guiomar, F. P.

Journal of Lightwave Technology Vol. 40, Nº 16, pp. 5432 - 5439, August, 2022.

ISSN (print): 0733-8724
ISSN (online):

Scimago Journal Ranking: 1,51 (in 2022)

Digital Object Identifier: 10.1109/JLT.2022.3176539

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In a subcarrier multiplexing 125 Gbaud DP-PCS-64QAM system with a net bitrate of 800 Gbit/s, we numerically and experimentally study the performance of transmission-aware carrier phase estimation (CPE) for long-haul systems. The recently proposed transmission-aware dual-reference subcarrier CPE (DRS-CPE) is assessed against a more conventional per-subcarrier CPE approach and a transmission-agnostic joint CPE in 8- and 16-subcarrier transmission. At laser linewidths of ∼150 kHz, we achieve an experimental signal-to-noise ratio gain over a single-carrier of up to 0.5 dB after 1800 km transmission, enabled by the DRS-CPE.