基于BPS算法的一种100 Gb/s/λ零差相干DP-16QAM PON系统  

A 100 Gb/s/λhomodyne coherent DP-16QAM PON system based on BPS algorithm

作　　者：张春蕾[1] 王永刚 李国栋 ZHANG Chunlei;WANG Yonggang;LI Guodong(School of Electronic and Information Engineering,Lanzhou Jiaotong University,Lanzhou,Gansu 730070,China)

机构地区：[1]兰州交通大学电子与信息工程学院,甘肃兰州730070

出　　处：《光电子.激光》2025年第3期303-309,共7页Journal of Optoelectronics·Laser

摘　　要：随着接入网带宽需求的增加,100 Gb/s/λ的相干无源光网络(passive optical network,PON)成为未来PON的关键。本文提出一种基于盲相位搜索(blind phase search,BPS)算法的100 Gb/s/λ零差相干DP-16QAM(dual polarization-16 quadrature amplitude modulation)PON系统。该系统在光线路终端(optical line terminal,OLT)一侧采用经过脉冲整形的偏振复用(polarization division multiplexing,PDM)16QAM信号,以降低符号速率。在光网络单元(optical network unit,ONU)一侧,采用零差相干检测技术接收信号,并在数字信号处理(digital signal processing,DSP)过程中使用BPS算法对系统相位噪声进行处理。仿真结果显示,该系统在经过20 km标准单模光纤(standard single-mode fiber,SSMF)传输后,可以实现32.2 dB的功率预算。同时,通过使用具有较大线宽容忍度的BPS算法,当误码率(bit error rate,BER)为10^(-4)时,经过20 km光纤传输后,10 MHz的激光器线宽仅比0.1 MHz多0.6 dB的灵敏度损失,使得相干PON系统可以在OLT一侧使用大线宽激光器来降低系统成本。With the increasing demand of access network bandwidth,100 Gb/s/λcoherent passive optical network(PON)has become the key of future PON.In this paper,a 100 Gb/s/λhomodyne coherent dual polarization-16 quadrature amplitude modulation(DP-16QAM)PON system based on blind phase search(BPS)algorithm is proposed.The system uses pulse-shaped polarization division multiplexing(PDM)16QAM signals on the optical line terminal(OLT)side to reduce the symbol rate.On the side of optical network unit(ONU),homodyne coherent detection technology is used to receive signals,and the BPS algorithm is used to process the system phase noise during the digital signal processing(DSP)process.The simulation results show that the system can achieve a power budget of 32.2 dB after 20 km standard single mode fiber(SSMF)transmission.At the same time,by using the BPS algorithm with a high linewidth tolerance,when the bit error rate(BER)is 10^(-4),after 20 km of fiber transmission,the sensitivity loss of the 10 MHz laser line width is only 0.6 dB more than that of 0.1 MHz,which allows the large linewidth laser to be used on the OLT side of the coherent PON system to reduce system costs.

关 键 词：无源光网络(PON) 偏振复用(PDM) 零差相干检测 盲相位搜索(BPS)算法 

分 类 号：TN929.18[电子电信—通信与信息系统]