| 程智慧,白成林,张霞,孙文涛.基于25GHz信道间隔和30Gbaud的28.8Tbit/s Nyquist-WDM系统性能研究[J].光电子激光,2015,26(11):2119~2124 |
| 基于25GHz信道间隔和30Gbaud的28.8Tbit/s Nyquist-WDM系统性能研究 |
| 28.8Tbit/s Nyquist-WDM transmission over 25GHz grid and 30Gbaud |
| 投稿时间：2015-08-19 |
| DOI： |
| 中文关键词: 多元低密度奇偶校验(NB-LDPC)码 奈奎斯特波分复用(Nyquist-WDM)系统 偏振复 用(PM) 正交幅度调制(QAM) 光纤通信 性能分析 |
| 英文关键词:nonbinary low-density parity-check (NB-LDPC) code Nyquist wavelengt h-division-multiplexe d (Nyquist-WDM) system polarization multiplexing (PM) quadrature amplitude mo dulation (QAM) fiber communication performance analysis |
| 基金项目:国家自然科学基金重点(61431009)、北京邮电大学信息光子学与光通信国家重点实验室开放基金(IPOC2013B005)资助项目 (聊城大学 物理科学与信息工程学院,山东省光通信科学与技术重点实验室,山东 聊城 252059) |
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| 中文摘要: |
| 为了提高奈奎斯特波分复用(Nyquist-WDM)系统的 频谱效率和传输距离,利用改进型多元低密度奇偶校验(NB-LDPC)码对Nyquist-WDM系 统进行信道编码,并结合偏振复用64进制正交幅度调制(PM-64QAM) 技术对28.8Tbit/s Nyquist-WDM相干检测系统进行性能研究。仿真结 果表明,经单模光纤(SMF)传输4900km之后, 与未采用编码的系统相比,在波特率为30Gbaud、信道间隔为25GHz 时,Nyquist-WDM系统通过采用改进型NB-LDPC码可以有效抑制符号间干扰,使误码性能改 善2.58dB, 频谱效率达到11.63bit/s/Hz；同时,通过采用NB-LDPC码可增加系 统的传输距离,改善系统对非线性效应的容忍度。 |
| 英文摘要: |
| In order to further improve the spectr al efficiency (SE) and to extend the transmission distance of Nyquist wavelength -division-multiplexed (Nyquist-WDM) system,this paper uses an improved nonbinary low-density parity-check (LDPC) code for channel coding in the Nyquist-WDM system and polarization multiplexing (PM) 64-ary quadrature amplitude modulation (QAM) tec hnique to study the performance of the 28.8Tbit/s Nyquist-WDM coherent detection system.With the s imulation conditions employed, the results show that with 4900km transmission distance in s ingle mode fiber (SMF),the inter-symbol interference (ISI) of the Nyquist-WDM PM 64QAM transmission system with baudrat e of 30Gbaud and channel grid of 25GHz can be suppressed effectively via adopting the improved NB-LDPC coding,resulting in 2.58dB improvement in bit error rate (BER) performance when com pared with the uncoded Nyquist-WDM PM 64QAM transmission system,and leading to a high spectral efficiency of 11.63bit·s－1·Hz－1.At the same time,due to the improved nonb inary LDPC coding,the transmission distance has been extended largely and the tolerance of the system to fiber nonlinear impairments has been enhanced eff ectively. |
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