基于步长优化和功率补偿因子的数字反向传播优化算法  

Digital Back Propagation Optimization Algorithm Based on Step-Size Optimization and Power Compensation Factor

作　　者：张力夫 张涛[1] 李梦岩 邓鹤鸣 罗风光[2] 杨柳[1] Zhang Lifu;Zhang Tao;Li Mengyan;Deng Heming;Luo Fengguang;Yang Liu(Hubei Key Laboratory of Micro-Nanoelectronic Materials and Devices,School of Microelectronics,Hubei University,Wuhan 430062,Hubei,China;National Engineering Research Center for Next Generation Internet Access-system,School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China)

机构地区：[1]湖北大学微电子学院,微纳电子材料与器件湖北省重点实验室,湖北武汉430062 [2]华中科技大学光学与电子信息学院,下一代互联网接入系统国家工程研究中心,湖北武汉430074

出　　处：《光学学报》2024年第16期260-268,共9页Acta Optica Sinica

基　　金：国家重点研发计划项目(2022YFB2903000);国家自然科学基金项目(62001181);武汉-曙光项目知识创新计划项目(202201080102335);湖北省自然科学基金项目(2022CFB480)。

摘　　要：提出一种基于功率均衡(EP)的步长设计方法,提高链路中的功率拟合性,将非线性效应更平滑地分布在各个运算过程中,用更少的步长对非线性效应实现相同的补偿性能。还为每个步长引入独立的功率补偿因子,使用遗传算法对已固定通信系统的功率补偿因子进行优化,进一步提高补偿精度。在使用新的步长设计和引入优化后的功率补偿因子后,提高功率均衡-数字反向传播(EP-DBP)的补偿精度,降低算法的复杂度。与传统DBP算法相比,该算法的复杂度降低了约50%,系统Q因子提高了约0.37 dB~0.57 dB。Objective Coherent optical communication is a main research focus in fiber optic communication and is suitable for modern communication networks due to its large bandwidth and long transmission distance.For long-distance fiber optic communication systems,increasing the launch power can improve the transmission distance and system capacity,but it will also result in the enhancement of nonlinear effects.With the rising transmission distance and communication rate of today’s communication systems,increasing the launch power not only improves the system capacity but also causes m ore obvious nonlinear effects.The digital back propagation(DBP)algorithm can compensate for the noise in optical fibers,but its high complexity limits its applications in coherent optical communication.Therefore,we propose a design method for the step size of the DBP algorithm for power equalization and introduce an independent power compensation factor for each step.The results show that both the step length design method and the introduced power compensation factor improve the ability of the DBP algorithm to compensate for nonlinear effects.Methods We focus on the nonlinear effects in optical fibers and investigate methods to compensate for them.Firstly,we investigate the DBP algorithm,which utilizes DSP technology to programmatically construct a virtual link in the digital domain with the same length as the real transmission fiber link but with opposite transmission parameters(loss,dispersion,and nonlinear coefficients),thus realizing the damage compensation in the optical fiber.Then the iterative process of the DBP algorithm is studied,the existing step-size design algorithms are derived,and numerical simulations are carried out in accordance with the formulas to analyze the power fitting of different step-size design algorithms in carrying out the iterations,with a step-size design method considering the power fitting being proposed.For the proposed power equalization step,an independent power compensation factor is also introduced fo

关 键 词：非线性光学 相干传输 等功率数字反向传播 遗传算法 光纤非线性 功率补偿因子 

分 类 号：O436[机械工程—光学工程]