Semrau, D;
Saavedra, G;
Lavery, D;
Killey, RI;
Bayvel, P;
(2017)
A Closed-Form Expression to Evaluate Nonlinear Interference in Raman-Amplified Links.
Journal of Lightwave Technology
, 35
(19)
pp. 4316-4328.
10.1109/JLT.2017.2741439.
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Abstract
An accurate, closed-form expression to evaluate the nonlinear interference (NLI) noise power in Nyquist-spaced, coherent optical communication systems using backward-pumped Raman amplification is presented. This enables rapid estimation of the signal-to-noise ratio (SNR) and avoids the need of integral evaluations and split-step simulations. The accuracy of the proposed formula is compared to numerical integration of the Gaussian noise (GN) model and split-step simulations over a wide range of parameters, including three different fiber types. Additionally, the impact of pump depletion on the NLI noise power is studied and the formula is applied to a second-order Raman-amplified system. In the case of first-order amplification and negligible pump depletion, a maximum deviation of 0.34 dB in NLI coefficient between the GN model and the closed-form formula is found which corresponds to a maximum deviation of 0.1 dB in optimal SNR or similar figures of merit (e.g., maximum reach). When pump depletion is considered, it is shown that the NLI coefficient becomes a function of launch power and as a result the cubic power dependence of the NLI noise power is no longer valid in such regimes. Finally, for the second-order Raman-amplified system, a maximum deviation of 0.39 dB in NLI coefficient is reported.
| Type: | Article |
|---|---|
| Title: | A Closed-Form Expression to Evaluate Nonlinear Interference in Raman-Amplified Links |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/JLT.2017.2741439 |
| Publisher version: | http://dx.doi.org/10.1109/JLT.2017.2741439 |
| Language: | English |
| Additional information: | This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see http://creativecommons.org/licenses/by/3.0/ |
| Keywords: | Interference, Closed-form solutions, Signal to noise ratio, Numerical models, Stimulated emission, Dispersion, Attenuation, Channel model, Gaussian noise model, nonlinear distortion, nonlinear interference, optical fiber communications, Raman amplification |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1573262 |
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