Hu Qian, Che Di, Wang Yifei, Shieh William
Opt Express. 2015 Feb 9;23(3):3245-59. doi: 10.1364/OE.23.003245.
The explosive growth of the traffic between data centers has led to an urgent demand for high-performance short-reach optical interconnects with data rate beyond 100G per wavelength and transmission distance over hundreds of kilometers. Since direct detection (DD) provides a cost-efficient solution for short-reach interconnects, various advanced modulation formats have been intensively studied to improve the performance of DD for high-performance short-reach optical interconnects. In this paper, we report the recent progress on the advanced DD modulation formats that provide superior electrical spectral efficiency (SE) and transmission reach beyond that of simple direct modulation (DM) based direct detection (DM/DD). We first provide a review of the current advanced modulation formats for high-performance short-reach optical interconnects. Among these formats, Stokes vector direct detection (SV-DD) achieves the highest electrical spectrum efficiency, presenting itself as a promising candidate for future short-reach networks. We then expound some novel algorithms to achieve high-performance SV-DD systems under severe impairments of either polarization mode dispersion (PMD) or polarization dependent loss (PDL).
数据中心之间流量的爆发式增长，导致迫切需要高性能的短距光互连，其每波长数据速率超过100G，传输距离达数百公里。由于直接检测（DD）为短距互连提供了一种经济高效的解决方案，因此人们对各种先进调制格式进行了深入研究，以提高用于高性能短距光互连的直接检测的性能。在本文中，我们报告了先进直接检测调制格式的最新进展，这些格式具有卓越的电频谱效率（SE），并且传输距离超过基于简单直接调制（DM）的直接检测（DM/DD）。我们首先综述了当前用于高性能短距光互连的先进调制格式。在这些格式中，斯托克斯矢量直接检测（SV-DD）实现了最高的电频谱效率，是未来短距网络的一个有前途的候选方案。然后，我们阐述了一些新颖的算法，以便在偏振模色散（PMD）或偏振相关损耗（PDL）的严重损伤情况下实现高性能的SV-DD系统。
