Transmitter skew tolerance and spectral efficiency tradeoff in high baud-rate QAM optical communication systems

被引：19

作者：

Yue, Yang ^{[1
]}

Wang, Qiang ^{[1
]}

Anderson, Jon ^{[1
]}

机构：

[1] Juniper Networks, 1133 Innovat Way, Sunnyvale, CA 94089 USA

来源：

OPTICS EXPRESS | 2018年 / 26卷 / 12期

关键词：

SPONTANEOUS EMISSION NOISE; BLIND EQUALIZATION; TRANSMISSION; NETWORKS; IQ;

D O I：

10.1364/OE.26.015045

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Residual IQ skew in a coherent transmitter severely degrades the performance of long-haul coherent optical communication systems. The impairment is particularly detrimental for a high baud-rate system using quadrature amplitude modulation (QAM). Furthermore, Nyquist pulse shaping increases the spectral efficiency for WDM systems. However, sharp roll-off of Nyquist pulse shaping further reduces the tolerance to residual IQ skew. Thus, certain trade-offs between spectral efficiency and roll-off factor should be made to improve the tolerance of residual IQ skew. We experimentally studied this trade-off and determined the optimal roll-off factor, channel spacing, receiver bandwidth, and equalizer length. The results serve as a guideline for high baud-rate coherent WDM systems. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

引用

页码：15045 / 15058

页数：14

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