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总览 评价 钱文辉 1, , 乔耀军 2,* ( 1、 北京邮电大学信息光子学与光通信国家重点实验室; 2、 北京邮电大学 信息光子学与光通信国家重点实验室; ) 摘要: 高登米勒效应(Gordon-Mollenauer,G-M)即非线性相位噪声会随着传输距离的增加而成三次方关
钱文辉1,, 乔耀军2,*
(
1、北京邮电大学信息光子学与光通信国家重点实验室; 2、北京邮电大学 信息光子学与光通信国家重点实验室; )
摘要:
高登米勒效应(Gordon-Mollenauer,G-M)即非线性相位噪声会随着传输距离的增加而成三次方关系剧增,是长距离相位调制系统中一个不可忽略的损伤。光OFDM系统由于其较高的PAPR和严格的正交性要求,势必对非线性相位噪声非常敏感。本文提出一种将高登米勒效应与光链路中其他噪声分离的方法,来研究CO-OFDM系统中自发辐射(ASE)噪声沿链路的分布是如何影响系统性能的。利用VPI和matlab软件,搭建了速率为112Gb/s的PDM-OFDM仿真平台。基于该平台,仿真了不同光功率下,CO-OFDM系统中G-M效应的变化趋势,并和相同容量的QPSK信号进行对比。研究表明,随着入纤功率的提高,G-M效应会伴随着克尔效应的增强而逐渐剧烈;同样的链路配置下,QPSK信号对G-M噪声更加敏感。
关键词:
光通信;高登米勒效应;正交频分复用;非线性;相位噪声
Qian Wenhui1,, QIAO Yaojun2,*
(
1、State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications; 2、Beijing University of Posts and Telecommunications State Key Laboratory of Information Photonics and Optical Communications; )
Abstract:
Nonlinear phase noise (Gordon-Mollenauer, G-M) is accumulated as the three power relations of transmission distance and it must not be negligible phase-shift-keyed modulation formats. Because of its high PAPR and strict requirement for orthogonality, optical OFDM system would be very sensitive to the nonlinear phase noise. In this article, we come up with a research method, which separates the nonlinear phase noise from the other noise in links, to study the amplified spontaneous emission (ASE) noise distributed in the fiber link. With the VPI and Matlab simulation tools, the 112Gb/s PDM-OFDM simulation platform is constructed. Based on the platform, the new research method is verified first, and the effect of G-M noise in OFDM system and QPSK system under different power is then simulated and contrasted. The results show that G-M effect will enhance with the increasing of input power. And the QPSK signal is more sensitive to the G-M than OFDM signal.
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