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首页> 美国卫生研究院文献>Scientific Reports >Equalization enhanced phase noise in Nyquist-spaced superchannel transmission systems using multi-channel digital back-propagation
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Equalization enhanced phase noise in Nyquist-spaced superchannel transmission systems using multi-channel digital back-propagation

机译：使用多通道数字反向传播的奈奎斯特间隔超通道传输系统中的均衡增强相位噪声

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Superchannel transmission spaced at the symbol rate, known as Nyquist spacing, has been demonstrated for effectively maximizing the optical communication channel capacity and spectral efficiency. However, the achievable capacity and reach of transmission systems using advanced modulation formats are affected by fibre nonlinearities and equalization enhanced phase noise (EEPN). Fibre nonlinearities can be effectively compensated using digital back-propagation (DBP). However EEPN which arises from the interaction between laser phase noise and dispersion cannot be efficiently mitigated, and can significantly degrade the performance of transmission systems. Here we report the first investigation of the origin and the impact of EEPN in Nyquist-spaced superchannel system, employing electronic dispersion compensation (EDC) and multi-channel DBP (MC-DBP). Analysis was carried out in a Nyquist-spaced 9-channel 32-Gbaud DP-64QAM transmission system. Results confirm that EEPN significantly degrades the performance of all sub-channels of the superchannel system and that the distortions are more severe for the outer sub-channels, both using EDC and MC-DBP. It is also found that the origin of EEPN depends on the relative position between the carrier phase recovery module and the EDC (or MC-DBP) module. Considering EEPN, diverse coding techniques and modulation formats have to be applied for optimizing different sub-channels in superchannel systems.
机译：以符号率间隔的超信道传输（称为奈奎斯特间隔）已被证明可以有效地最大化光通信信道的容量和频谱效率。但是，使用高级调制格式的传输系统可达到的容量和范围受到光纤非线性和均衡增强相位噪声（EEPN）的影响。使用数字反向传播（DBP）可以有效地补偿光纤的非线性。然而，由于激光相位噪声和色散之间的相互作用而产生的EEPN不能有效地减轻，并且会大大降低传输系统的性能。在这里，我们报告首次调查了EEPN在奈奎斯特间隔超通道系统中的起源和影响，该系统采用电子色散补偿（EDC）和多通道DBP（MC-DBP）。分析在Nyquist间隔的9通道32 Gbaud DP-64QAM传输系统中进行。结果证实，EEPN大大降低了超级通道系统所有子通道的性能，并且使用EDC和MC-DBP时，外部子通道的失真更加严重。还发现EEPN的起源取决于载波相位恢复模块和EDC（或MC-DBP）模块之间的相对位置。考虑到EEPN，必须使用各种编码技术和调制格式来优化超信道系统中的不同子信道。

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