利用后置补偿法对 10-Gbit/s 长距离波分复用光纤传输系统进行色散均衡

Dispersion Equalization of 10 Gb/s WDM Optical Fiber Transmission Systems Using Post Compensation Technique

通过系统仿真，对以常规单模光纤和色散补偿光纤（ＳＭＦ＋ＤＣＦ）组成的１６×１０－Ｇｂ／ｓＷＤＭ色散补偿系统进行了分析，调制器啁啾为０，激光器静态线宽为５ＭＨｚ。结果表明：（１）对于数百公里的传输距离，以ＤＣＦ进行在线补偿就可以使各个信息达到较好的色散补偿效果（１６×１０－Ｇｂ／ｓ，４００ｋｍ，眼图代价差别小于０．５ｄＢ）；（２）由于ＳＰＭ在ＳＭＦ光纤中对脉冲的压缩效应，每一信道应保持略微偏正的残留色散量；（３）对于上千公里的传输距离，仅以ＤＣＦ进行在线补偿无法同时均衡所有信道的色散（１６×１０－Ｇｂ／ｓ，１２００ｋｍ，眼图代价差别大于０．８５ｄＢ）。为此，本文以ＳＭＦ或ＤＣＦ在系统接收端再次对各信道逐个进行色散补偿（后置色散补偿），达到了良好的效果（１６×１０－Ｇｂ／ｓ，１２００ｋｍ，眼图代价差别小于０．３ｄＢ）。

For very long distance 10 Gb/s WDM optical fiber transmission systems, dispersion in each channel can not be simultaneously compensated using periodic in line dispersion compensation method(SMF+DCF) because of slightly different dispersion value at each channel wavelength. To overcome this obstacle, the authors proposed a post compensation method for such systems. The simulation results demonstrate that the dispersion of each channel can be effectively equalized by using this method.