基于LDPC码的相干光通信QNSC系统方案  

Coherent optical communication QNSC system scheme based on LDPC code

作　　者：刘川 黄在朝 刘世栋 李俊佳 雷超 张杰[3] LIU Chuan;HUANG Zaichao;LIU Shidong;LI Junjia;LEI Chao;ZHANG Jie(Global Energy Interconnection Research Institute co.,Ltd.,Beijing 102209,China;Electric Power Communication Network Technology Laboratory,State Grid Corporation of China,Beijing 102209,China;State Key Laboratory of Information Photonics and Optical Communication,Beijing University of Posts and Telecommunications,Beijing 100876,China)

机构地区：[1]全球能源互联网研究院有限公司,北京102209 [2]国家电网有限公司电力通信网络技术实验室,北京102209 [3]北京邮电大学信息光子学与光通信国家重点实验室,北京100876

出　　处：《光通信技术》2021年第2期24-27,共4页Optical Communication Technology

基　　金：国家电网有限公司科技项目(5100-201940006A-0-0-00)资助。

摘　　要：针对光网络物理层安全通信问题,提出了基于低密度奇偶校验(LDPC)码的相干通信量子噪声流加密(QNSC)系统方案,将码率为9/10的LDPC码和离散傅里叶变换正交频分复用(DFT-OFDM)技术应用在系统方案中,最后对该方案进行了实验验证。实验结果表明:经过传输跨距为40 km、80 km、120 km和160 km的标准单模光纤后,LDPC码有效地降低了系统误码率,改善了系统通信的安全性,同时不会对系统的基本性能造成影响。Aiming at the problem of secure communication in physical layer of optical network,a coherent communication quantum noise stream encryption(QNSC)system scheme based on low density parity check(LDPC)code is proposed.The LDPC code with a bit rate of 9/10 and discrete Fourier transform orthogonal frequency division multiplexing(DFT-OFDM)technology are applied in the system scheme.Finally,the scheme is verified by experiments.The experimental results show that after transmitting the standard single-mode fiber with the span of 40 km,80 km,120 km and 160 km,The LDPC code effectively reduces the bit error rate of the system,improves the communication security of the system,and does not affect the basic performance of the system.

关 键 词：安全通信 量子噪声流加密 误码率 低密度奇偶校验 传输性能 

分 类 号：TN929.11[电子电信—通信与信息系统]