Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 40, Issue 16, Pages 5567-5574Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2022.3183162
Keywords
Predictive models; Mathematical models; Interference; Symbols; Analytical models; Wavelength division multiplexing; Gaussian noise; Coherent systems; enhanced Gaussian noise model; four-dimensional modulation formats; Gaussian noise model; Kerr nonlinearity; optical fiber communications
Funding
- NSF [CNS-1718130]
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This paper introduces a general nonlinear model that accurately predicts nonlinear interference in optical transmission systems for 4D symmetric modulation formats.
Optical transmission systems intrinsically enjoy a four-dimensional (4D) constellation space, corresponding to two quadratures in two polarization states. In this paper, we introduce a general nonlinear model that is valid for 4D symmetric modulation formats. We take the inter-polarization dependency into account to derive this model. The model accounts for all perturbative nonlinear interference (NLI) terms, including self-channel, cross-channel and multi-channel interferences. Split-step Fourier simulations show that the proposed model has the ability to predict the NLI with high levels of accuracy for both low and high fiber dispersion regimes. The simulation results further show that previous models, including the EGN model, inaccurately predict the NLI in certain scenarios.
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