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Unlocking the Shaping Gain in Unamplified Coherent Links

Oliveira, B. M. ; Neves, M. S. ; Silva, J. H. ; Guiomar, F. P. ; Medeiros, M. C. R. ; Monteiro, P.

Unlocking the Shaping Gain in Unamplified Coherent Links, Proc Signal Processing in Photonic Communications (SPPCom) SPPCom, Quebec, Canada, Vol. , pp. - , July, 2024.

Digital Object Identifier: 10.1364/SPPCOM.2024.SpM3G.5

 

Abstract
The benefits of probabilistic constellation shaping in unamplified links are still under debate, putting into question Maxwell-Boltzmann (MB)-based PCS. We optimize the probability mass function and demonstrate gains of 4.2 dB at 400 Gbit/s.