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Recent progress in coherent optical communication technologies

机译：相干光通信技术的最新进展

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High-speed and high-capacity optical transmission systems are being intensively investigated toward the future cost-effective optical transport networks (OTN) needed to meet the huge traffic demand expected. Coherent detection with digital signal processing (DSP) is very promising to realize such systems. DSP-based linear equalizers can effectively eliminate the signal distortion caused by chromatic dispersion and polarization mode dispersion which are the main factors limiting the attainable distance of high speed channels over 40 Gb/s. Moreover, their combination with advanced modulation and polarization multiplexing techniques has yielded large capacity and spectrally-efficient transmission experiments. This paper reviews recent progress in coherent communication technologies, with special focus on higher order multi-level modulation such as quadrature amplitude modulation (QAM), and discusses higher speed transmission based on optical multiplexing techniques such as optical orthogonal frequency-division multiplexing (OFDM) toward 400G or IT channel transport.
机译：为了满足预期的巨大流量需求，正在对未来的高性价比光传输网络（OTN）进行高速，高容量的光传输系统的深入研究。数字信号处理（DSP）的相干检测对于实现这样的系统非常有前途。基于DSP的线性均衡器可以有效消除由色散和偏振模色散引起的信号失真，色散和偏振模色散是限制40 Gb / s以上高速通道可达到距离的主要因素。而且，它们与先进的调制和极化多路复用技术的结合已经产生了大容量和频谱有效的传输实验。本文回顾了相干通信技术的最新进展，特别关注诸如正交幅度调制（QAM）之类的高阶多级调制，并讨论了基于光正交频分复用（OFDM）等光复用技术的高速传输走向400G或IT通道传输。

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