Nonlinear Electrical Compensation for the Coherent Optical OFDM System
Nonlinear Electrical Compensation for the Coherent Optical OFDM System
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DOI：
10.1109/jlt.2010.2098017
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发表时间：
2011-01
影响因子：
4.7
通讯作者：
Jie Pan;Chi-Hao Cheng
中科院分区：
文献类型：
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作者：
Jie Pan;Chi-Hao Cheng
相干光正交频分复用(CO-ofdm)系统的一个主要缺点是对光纤非线性的敏感性。基于Volterra模型的非线性电均衡器已被证明能够补偿OOK或PSK光通信系统中的光纤非线性失真。然而，基于Volterra模型的电均衡器实现的复杂性限制了其在实际的CO-ofdm系统中的部署。在本文中，我们证明了利用改进的Gram-Schmidt方法和再正交化技术可以显著减少基于Volterra模型的均衡器的核数目。所得到的基于“稀疏”Volterra模型的电均衡器和基于“全”Volterra模型的电均衡器具有相当的性能，并且可以补偿16-QAM 100Gbit/S CO-ofdm系统的信道内非线性。
A main drawback of Coherent Optical Orthogonal Frequency Division Multiplexing (CO-OFDM) system is its sensitivity to fiber nonlinearity. Nonlinear electrical equalizer based on Volterra model has been demonstrated capable of compensating fiber nonlinear distortion in an OOK or PSK optical communication system. However, the implementation complexity of a Volterra model based electrical equalizer prohibits its deployment in a real-life CO-OFDM system. In this paper, we demonstrate that the number of kernels of a Volterra model based equalizer can be significantly reduced using the modified Gram-Schmidt method with reorthogonalization techniques. The resulting “sparse” Volterra model based electrical equalizer and the electrical equalizer based on the “full” Volterra model have comparable performance and can compensate intra-channel nonlinearity of a 16-QAM 100 Gbit/s CO-OFDM System.