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为了实现对40Gb/s城域网光纤链路的色散补偿,采用色散补偿光纤,结合后置补偿技术,利用Optisystem仿真软件搭建光纤链路。综合考虑考虑群速度色散,由克尔效应导致的自相位调制,线性损耗以及周期放大带来的放大自发辐射噪声,研究了RZ和NRZ调制格式对40 Gb/s系统的影响并分析入纤光功率对40Gb/s RZ调制格式下的光通信系统补偿效果。最后结合城域网系统特性,取得传输系统Q值与DCF光纤长度的关系曲线。结果表明,40 Gb/s城域网系统在采用单段色散补偿方案和RZ调制格式下,控制入纤光功率为2d Bm,系统Q值最高可达20.7,此种补偿方案对40Gb/s城域网升级扩容具有参考意义。
In order to realize the dispersion compensation of the fiber link of 40Gb / s MAN, the dispersion compensation fiber is adopted, and the fiber compensation link is set up with Optisystem software. The effects of RZ and NRZ modulation formats on the 40 Gb / s system are studied by considering the group velocity dispersion, the self-phase modulation due to the Kerr effect, the linear loss and the amplified spontaneous emission noise caused by the periodic amplification. Power Compensation for Optical Communication Systems in 40Gb / s RZ Modulation Format. Combined with the characteristics of metropolitan area network system, the relationship between the transmission system Q value and the length of the DCF fiber is obtained. The results show that the 40Gb / s metropolitan area network system uses the single-segment dispersion compensation scheme and the RZ modulation scheme to control the input fiber power to 2d Bm and the system Q value to be up to 20.7. This compensation scheme is effective for 40Gb / s city Domain upgrade upgrade has reference value.