Effect of second order signal-noise interactions in nonlinearity compensated optical transmission systems.
Effect of second order signal-noise interactions in nonlinearity compensated optical transmission systems.
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DOI：
10.1364/ol.41.001849
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发表时间：
2016-04
期刊：
影响因子：
3.6
通讯作者：
M. Al-Khateeb;M. McCarthy;C. Sánchez;A. Ellis
中科院分区：
文献类型：
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作者：
M. Al-Khateeb;M. McCarthy;C. Sánchez;A. Ellis
在这封信中，我们从理论上和数值上分析了相干光传输系统的性能，部署内联或收发器为基础的非线性补偿技术。对于信号-信号非线性相互作用得到充分补偿的系统，我们发现，超出性能峰值的信噪比退化有一个斜率为3 dBSNR/dBPower，这表明信号功率的四次而不是二次依赖。这与以下事实直接相关，即给定跨度中的信号不仅与线性放大的自发辐射噪声相互作用，而且与先前（迄今为止）未补偿跨度中由信号-噪声相互作用产生的非线性四波混频产物相互作用。采用不同的非线性补偿方案的光学系统的性能进行了数值模拟和分析预测相比，显示出良好的协议在0.4 dB的误差范围内。
In this Letter, we theoretically and numerically analyze the performance of coherent optical transmission systems that deploy inline or transceiver based nonlinearity compensation techniques. For systems where signal-signal nonlinear interactions are fully compensated, we find that beyond the performance peak the signal-to-noise ratio degradation has a slope of 3 dBSNR/dBPower suggesting a quartic rather than quadratic dependence on signal power. This is directly related to the fact that signals in a given span will interact not only with linear amplified spontaneous emission noise, but also with the nonlinear four-wave mixing products generated from signal-noise interaction in previous (hitherto) uncompensated spans. The performance of optical systems employing different nonlinearity compensation schemes were numerically simulated and compared against analytical predictions, showing a good agreement within a 0.4 dB margin of error.