In this paper the intensity modulation and direct detection of an optical link utilizing a Modified Manchester (MM) signal at the bitrate of 10 Gb/s and 25 Gb/s are presented for long-reach optical access networks. First-order and second-order optical equalizer were utilized to compensate the distortion in MM signal waveform caused by the chromatic dispersion in standard single mode fiber (SSMF). The assessment of the system performance was centered on bit error rate (BER), power penalty, eye diagrams and chromatic dispersion tolerance. Based on the calculated results the use of second-order optical equalizer, can extend the transmission distance by 20 km (SSMF) and 3.5 km at 10 Gb/s and 25 Gb/s, respectively. Based on the calculated results, the use of second-order optical equalizer is therefore promising in the next generation of long-reach optical access networks.

在本文中，针对长距离光接入网络，提出了使用调制的曼彻斯特（MM）信号以10 Gb / s和25 Gb / s的比特率对光链路进行强度调制和直接检测的方法。一阶和二阶光学均衡器用于补偿由标准单模光纤（SSMF）中的色散引起的MM信号波形失真。对系统性能的评估集中于误码率（BER），功率损失，眼图和色散容限。根据计算结果，使用二阶光学均衡器可以分别在10 Gb / s和25 Gb / s时将传输距离扩展20 km（SSMF）和3.5 km。根据计算结果，