高速光纤通信系统中DBP算法的步长选择  

Optimal Step Size for DBP in High Speed Optical Fiber Communication System

作　　者：黄丽艳 雷学义 李燕 李伟华 吴珍 朱京 喻杰奎 龙函 冯其光 HUANG Li-yan;LEI Xue-yi;LI Yan;LI Wei-hua;WU Zhen;ZHU Jing;YU Jie-kui;LONG Han;FENG Qi-guangs(Accelink Technologies Co. ,Ltd. , Wuhan 430205, China;State Grid In}.ormation and Telecommunication Branch, Beijing 100761, China;Wuhan National Laboratory for Optoelectronics, HUST, Wuhan 430074, China)

机构地区：[1]武汉光迅科技股份有限公司,武汉430205 [2]国家电网公司信息通信分公司,北京100761 [3]华中科技大学武汉光电国家实验室,武汉430074

出　　处：《光通信研究》2018年第3期13-16,共4页Study on Optical Communications

摘　　要：文章提出了一种新的应用于高速光纤通信系统接收端的数字背向传输(DBP)算法的步长变换选择方法。通过采用斜线方法对光纤非线性系数的指数形式曲线进行近似,找出使斜线的斜率与原曲线各点斜率差值最小情况下的步长,再用于变步长DBP算法中对光纤传输中的非线性损伤进行补偿。在3 200km单信道25Gbaud光纤传输系统中对所提步长选择方案进行了仿真。结果表明,在相同系统中,与其他步长选择方法相比,在最佳入纤功率时所提步长选择方案的Q值提升了0.5dB;当入纤功率越大、非线性效应越强时,所提方法对于光纤传输非线性损伤的补偿能力更好,而算法复杂度没有改变。This paper proposes a new step size distribution method in variable step size Digital Back Propagation（DBP）algorithm.Several oblique lines are used to estimate the effective nonlinear coefficient which exponentially increases with the distance.Then a step size distribution is determined to ensure the difference of the slope between the oblique lines and the exponential curve is minimum.The optimal step size distribution is used in split-step Fourier method to compensate the nonlinear impairments.Simulation is implemented in a 3 200 km Daul-Polarization Quadrature Phase Shift Keying（DPQPSK）system with single channel rate of 25 Gbaud using the proposed step size distribution method.Simulation results show that the Q-value based on the step size distribution method is increased about 0.5 dB when compared with uniform step size distribution method.The proposed algorithm has larger tolerance on the nonlinear effects with low complexity.

关 键 词：数字背向传输算法 斜线法步长选择 分步傅里叶变换法 

分 类 号：TN929.11[电子电信—通信与信息系统]