Theoretical and experimental assessment of nonlinearity mitigation through symbol rate optimization

2015 Tyrrhenian International Workshop on Digital Communications (TIWDC) Pub Date : 2015-11-12 DOI:10.1109/TIWDC.2015.7323330

P. Poggiolini, G. Bosco, A. Carena, V. Curri, Y. Jiang, S. M. Bilal, A. Nespola, L. Bertignono, S. Abrate, F. Forghieri

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引用次数: 2

Abstract

We investigated the reach increase obtained through non-linearity mitigation by means of transmission symbol rate optimization (SRO). First, we did this theoretically and simulatively. We found that for PM-QPSK systems at full-C-band the reach increase may be substantial, on the order of 10%-25%, with optimum symbol rates on the order of 2-to-6 GBaud. We extended the investigation to PM-16QAM, where we found a qualitatively similar effect, although the potential reach increase is typically only about half that of PM-QPSK. We then set up an experiment to obtain confrmation of the theoretical and simulative predictions. We demonstrated a reach increase of 11% in a 19-channel, 128 Gbit/s per channel, PM-QPSK experiment, when going from single-carrier to multi-subcarrier (up to 16 subcarriers per channel) transmission. The experiment reached 14,100 km over PSCF, with 110 km spans and EDFA-only amplifcation. The results matched well the EGN model predictions.

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符号率优化非线性缓解的理论与实验评估

我们研究了通过传输符号速率优化(SRO)的非线性缓解所获得的增益。首先，我们从理论上和模拟上进行了研究。我们发现，对于全c波段的PM-QPSK系统，覆盖范围可能会大幅增加，约为10%-25%，最佳符号速率约为2至6 GBaud。我们将调查扩展到PM-16QAM，在那里我们发现了质量上类似的效果，尽管潜在的覆盖范围增加通常只有PM-QPSK的一半左右。然后，我们建立了一个实验来验证理论和模拟预测。我们演示了在19通道、每通道128 Gbit/s的PM-QPSK实验中，从单载波到多子载波(每通道多达16个子载波)传输时，到达率增加了11%。实验在PSCF上空达到14100公里，跨度为110公里，只放大edfa。结果与EGN模型预测结果吻合较好。

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2015 Tyrrhenian International Workshop on Digital Communications (TIWDC)

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