The growing demand for bandwidth requires the increasing of capacity and reach of wavelength-division multiplexing (WDM) systems, and simultaneous reducing of cost per bit脳km. In this report, I will at first introduce the 40Gbit/s transponder and 40脳42.8 Gbit/s WDM long-haul transmission experimental system over standard single mode fiber using all-Raman amplification in our laboratory. By optimizing the chirp of electro-absorption modulation and dispersion compensation, 42.8Gbit/s NRZ transmission over 1200km standard single mode fiber was achieved. Then our work about the fiber impairments in N脳40Gbit/s WDM and polarization-division multiplexing (PDM) system will be reviewed. Also the technique to mitigate the impairment will be described. In particular, Electronic equalization used to overcome the distortion caused by inter-symbol interference (ISI) will be reviewed, and its capability of equalization for intra-channel nonlinearity will be discussed.
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机译：对带宽的不断增长的需求需要增加波分复用（WDM）系统的容量和覆盖范围，并同时降低每位脳km的成本。在本报告中，我首先将在实验室中使用标准单模光纤来引入40Gbit / s的转发器和40÷42.8 Gbit / S WDM长途传输实验系统。通过优化电吸收调制和色散补偿的啁啾，实现了42.8Gbit / s NRZ传输超过1200km标准的单模光纤。然后，我们将审查关于N脳40Gbit / s WDM和偏振分割复用（PDM）系统中的光纤损伤的工作。还将描述减轻损伤的技术。特别地，将被审查用于克服由符号间干扰（ISI）引起的失真（ISI）的电子均衡，并且将讨论对信道内非线性的均衡能力。
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