光纤非线性补偿中低通滤波器对DBP算法的影响  

Influence of low pass filter with optical fiber nonlinear compensation on DBP algorithm

作　　者：邓黎 李伯中 金炜 马超 徐健 项旻 黄丽艳 龙函 DENG Li;LI Bozhong;JIN Wei;MA Chao;XU Jian;XIANG Min;HUANG Liyan;LONG Han(State Grid Information&Telecommunication Co.,Ltd.(SGIT),Beijing 100761,China;Accelink Technologies Co.,Ltd.,Wuhan 430205,China)

机构地区：[1]国家电网有限公司信息通信分公司,北京100761 [2]武汉光迅科技股份有限公司,武汉430205

出　　处：《光通信技术》2021年第7期10-13,共4页Optical Communication Technology

基　　金：国家电网有限公司科技项目(合同号:SGZB0000TGJS1901930)资助。

摘　　要：针对光纤非线性补偿中低通滤波器对数字后向传输(DBP)算法复杂度与补偿精度的影响,研究了256 Gb/s偏振复用16阶正交振幅调制(PDM-16QAM)信号在采用贝塞尔、高斯和巴特沃斯低通滤波器时的非线性补偿特性。实验结果表明:当步长较小时,3种低通滤波器对DBP算法影响基本一致;当步长较大时,高阶贝塞尔低通滤波器的性能最佳。此外,当低通滤波器阶数为1、3 dB带宽固定为8 GHz和步长大于40 km时,高斯低通滤波器比其它2种低通滤波器的Q因子高约0.1 dB。Aiming at the influence of low-pass filter in optical fiber nonlinear compensation on the algorithm complexity and compensation accuracy of digital back propagation(DBP),the nonlinear compensation characteristics of 256 Gb/s polarization multiplexing 16 order quadrature amplitude modulation(PDM-16QAM)signal with Bessel,Gaussian and Butterworth low-pass filters are studied.The experimental results show that when the step size is small,the influence of three low-pass filters on DBP algorithm is basically the same,when the step size is large,the performance of high-order Bessel low-pass filter is the best.In addition,when the order of the low-pass filter is 1 and the 3 dB bandwidth is fixed at 8 GHz and the step size is greater than 40 km,the Q factor of the Gaussian low-pass filter is about 0.1 dB better than that of the other two low-pass filters.

关 键 词：相干光通信 低通滤波器 非线性 单模光纤 数字后向传输 

分 类 号：TN256[电子电信—物理电子学]