Optimising O-to-U Band Transmission Using Fast ISRS Gaussian Noise Numerical Integral Model
Journal of Lightwave Technology(2024)
摘要
We model the transmission of ultrawideband (UWB) signals, including
wavelength-dependent fibre parameters: dispersion, nonlinear coefficient and
effective fibre core area. To that end, the inter-channel stimulated Raman
scattering Gaussian noise (ISRS GN) integral model is extended to include these
parameters. The integrals involved in this frequency-domain model are
numerically solved in hyperbolic coordinates using a Riemann sum. The model
implementation is designed to work on parallel graphics processing units (GPUs)
and is optimised for fast computational time. The model is valid for
Gaussian-distributed signals and is compared with the split-step Fourier method
(SSFM), for transmission over standard single-mode fibre (SSMF) in the O-band
(wavelengths around the zero-dispersion wavelength), showing reasonable
agreement. Further, we demonstrated SNR evaluation over an 80 km SSFM
single-span transmission using 589×96 GBaud channels, corresponding to
almost 59 THz optical bandwidth, fully populating the O, E, S, C, L and U bands
(1260-1675 nm). The SNR evaluation is completed in just 3.6 seconds using
four Nvidia V100 16GB PCIe GPUs. Finally, we used this model to find the
optimum launch power profile for this system achieving 747 Tbps of potential
throughput over 80 km fibre and demonstrating its suitability for UWB
optimisation routines.
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关键词
Ultrawideband transmission,Raman amplification,Gaussian noise model,nonlinear interference,optical fibre communications,inter-channel stimulated Raman scattering
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