4B/SB编码的再调制WDM-PON系统分析与实现

摘要

在输入RSOA功率和数据编码方式不同的情况下,为了解决下行信号对上行再调制信号的串扰问题,研究了上行信号的误码率(BER)性能,并采用了下行2.5 Gb/s,上行1.25 Gd/s的非对称数据传输,4B/5B编码的下行信号再调制的波分复用无源光网络(WDM-PON)系统模型.最后通过MATLAB编程实现4B/5B编码,并在Optisystem软件中进行联合仿真.实验结果表明相对于NRZ编码和Manchester编码,4B/5B编码再调制系统可将编码效率提高到80％.%In order to solve the cross-talk problems of up-link to down-link signal re-modulated signal when the input power of RSOA and the coding schemes are different,this paper analyzes the property of The up-link signal bit error rate (BER),and uses a downstream 2.5 Gb/s,upstream 1.25 Gb/s asymmetric data transmission,and proposes a wavelength division multiplexing passive optical system model based on 4B/5B encoding downstream signals re-modulation.The 4B/5B encoding has been realized in MATLAB program,combined with Optisystem software.Experiement results show that 4B/5B coding and modulation system can improve the coding efficiency to eighty percent.