匹配滤波在相干光纤通信系统中的特性研究  

Study on the Characteristics of Matched Filtering for Coherent Optical Fiber Transmission System

作　　者：段明雄 朱京 卢贺 吴广哲 李伟华 黄超 龙函 吴剑军 DUAN Ming-xiong;ZHU Jing;LU He;WU Guang-zhe;LI Wei-hua;HUANG Chao;LONG Han;WU Jian-jun(Accelink Technologies Co.,Ltd.,Wuhan 430205,China;State Grid Information and Telecommunication Brand,Beijing 100761,China)

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

出　　处：《光通信研究》2021年第3期33-37,共5页Study on Optical Communications

基　　金：国家电网有限公司科技项目资助项目(SGZB0000TGJS1901135)。

摘　　要：针对相干光纤通信系统中匹配滤波(如根升余弦滤波器)对系统的影响,文章在不同光学带宽、残余色散以及非线性情况下,对不同滚降因子Rf的系统特性进行了研究。文章分别仿真研究了256 Gbit/s偏振复用16阶正交幅度调制(PDM-16QAM)信号在光学带宽为33、50及100 GHz时的传输特性、残余色散在-300~300 ps/nm区间内的特性和注入功率为-3~4 dBm情况下传输1 200 km光纤链路的特性。仿真结果表明,对于光学带宽受限的系统,Rf选取(1+Rf)B(B为信号波特率)与系统光学带宽相近的值为宜;对于光学带宽接近两倍波特率的系统,滚降因子Rf选取0.2~0.5为宜。Aiming at the influence of matched filter(e.g. root raised cosine filter) on the coherent optical fiber communication system, the effect of roll-off factor(Rf) are studied under different value of optical bandwidth, residual dispersion and nonlinearity. Simulations are carried out for 256 Gbit/s Polarization Division Multiplexing-16 Quadrature Amplitude Modulation(PDM-16 QAM) signals when the optical bandwidth are 33, 50 and 100 GHz, the residual dispersion ranging from-300 to 300 ps/nm and launched power ranging from-3 to 4 dBm in a 1 200 km optical fiber link. The simulations show that a good transmission performance can be achieved for limited optical bandwidth system when Rf is set to the value of(1+Rf) B(B is the Baud rate of the signal) that similar to the system optical bandwidth. When optical bandwidth near or exceed 2 times Baud rate of signals, Rf should be set between 0.2 and 0.5 to achieve a better transmission performance.

关 键 词：相干光通信 匹配滤波 根升余弦 单模光纤 

分 类 号：TN256[电子电信—物理电子学]