A novel blind nonlinear equalization (BNLE) technique based on the iterative re-weighted least square is experimentally demonstrated for single and multi-channel coherent optical orthogonal frequency-division multiplexing (CO-OFDM). The adopted BNLE combines, for the first time, a support vector machine-learning cost function with the classical Sato or Godard error functions and maximum likelihood recursive least-squares. At optimum launched optical power, BNLE reduces the fiber nonlinearity penalty by ~1 (16-QAM single-channel at 2000 km) and ~1.7 dB (QPSK multi-channel at 3200 km) compared to a Volterra-based NLE. The proposed BNLE is more effective for multi-channel configuration: 1) it outperforms the ‘gold-standard’ digital-back propagation; 2) for a high number of subcarriers the performance is better due to its capability of tackling inter-subcarrier four-wave mixing.
This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:
EU Horizon 2020 under the Marie Skłodowska-Curie grant agreement No 713567, Science Foundation Ireland (SFI), European Regional Development Fund under Grant Number 13/RC/2077
ID Code:
22413
Deposited On:
11 Jul 2018 10:45 by
Ilias Giakoumidis
. Last Modified 13 Sep 2018 11:16