Advanced Modulation Schemes for Short-Range Optical Communications
Advanced Modulation Schemes for Short-Range Optical Communications
复制标题
DOI：
10.1109/jstqe.2010.2040808
复制
发表时间：
2010-03
影响因子：
4.9
通讯作者：
S. Randel;F. Breyer;S. C. J. Lee;J. Walewski
中科院分区：
文献类型：
--
作者：
S. Randel;F. Breyer;S. C. J. Lee;J. Walewski
本文综述了用于频谱高效数据传输的先进调制方案的性能，目标是具有直接检测的短距离强度调制光信道。因此，重点在于与电子均衡相结合的多电平脉冲幅度调制的性能，作为一种替代的调制方案，离散多音。本文对限幅噪声进行了全面的统计分析，导出了对称限幅离散多音系统性能的精确表达式。结果表明，削波噪声是脉冲噪声，服从广义拉普拉斯分布。详细研究了限幅引起的误码率，发现限幅噪声的影响随着子信道数目的增加而减小。最后，比较了多级脉冲幅度调制结合电子均衡和离散多音结合边缘自适应比特加载的光链路边缘。据发现，即使是对称裁剪离散多音遭受其峰值功率受限的信道中的大波峰因数，并且在许多情况下，脉冲幅度调制提供了较高的链路裕度相同的目标比特错误概率。
The performance of advanced modulation schemes for spectrally efficient data transmission is reviewed, targeting short-range intensity-modulated optical channels with direct detection. Hereby, the focus lies on the performance of multilevel pulse-amplitude modulation combined with electronic equalization and, as an alternative modulation scheme, discrete multitone. A comprehensive statistical analysis of clipping noise is presented and exact expressions for the performance of symmetrically clipped discrete multitone are derived. It is shown that the clipping noise is impulsive and obeys a generalized Laplace distribution. The bit-error probability due to clipping is studied in detail, and it is found that the impact of clipping noise is reduced for an increasing number of subchannels. Finally, the optical link margins of multilevel pulse-amplitude modulation in combination with electronic equalization and that of discrete multitone in combination with margin-adaptive bit loading are compared. It is found that even symmetrically clipped discrete multitone suffers from its large crest factor in the peak-power-limited channel and that, in many instances, pulse-amplitude modulation provides higher link margins for the same target bit-error probability.