100G相干传输的技术发展

100G线路传输技术及产业链条已经发展成熟,目前已成为网络运营商应对几何式带宽需求增长的最佳解决方案。PDM—QPSK调制及相干检测技术被OIF国际标准化组织确定为100Gbit／s长距离传输的标准收发方式。本文将对光信号码型选择、FEC软／硬判决、发端DSP等100G相干传输的关键技术进行介绍。     

100G光传输系统

主要简介了100G系统的技术实现、标准进展、测试仪表的准备、规模化部署展望情况,最后简要说明了100G系统组网思路。     

100Gb/s PDM-QPSK系统传输性能评估技术研究

研究了基于高速相干光接收的100Gb/s PDM-QPSK系统的传输性能评估技术,将解析评估公式推广到不同调制格式、带宽和不规则链路跨段等应用场景中并进行系统仿真验证.仿真结果显示,该评估方法能快速、准确地计算出不同功率、调制格式和跨段配置下的系统传输性能,Q因子误差低于0.8dB.     

广东电信100G波分网络建设及维护探讨

通过总结广东电信现有波分传输平台特别是40G系统在部署和维护实践过程中发现的问题,从业务增长和传输技术发展的角度,说明了广东电信波分网络应逐步停止40G网络建设并向100G网络演进的趋势,进而在100G网络的建设模式、网络技术应用、网络维护注意事项等方面提出了意见和建议。     

Performance enhancement of visible light communication (VLC) system incorporating WMZCC-OCDMA codes and PDM-QPSK-DSP data encoding

Multi-user optical code division multiplexing (OCDMA) in visible light communication (VLC) is an imminent domain for providing an even distribution of available bandwidth and improved security. Q4R1Zero cross-correlation (ZCC) codes are widely reported, and improved performance is offered by them due to insignificant multiple access interference (MAI). However, practically, MAI exists in ZCC codes due to adjacent weights (W) in the code matrix rows for each user. Therefore, a novel ZCC code with a nonadjacent W is designed in this work to eradicate MAI limitations and is named weight managed ZCC codes (WMZCC). An indoor 100 Gbps/User OCDMA-VLC system is realised using polarisation division multiplexed quadrature phase shift keying (PDM-QPSK) and digital signal processing (DSP). Incorporation of DSP in the coherent receiver compensates the effects of dispersion and nonlinear effects and also performs phase estimation. Further, a state-of-the-art comparison of WMZCC codes with diagonal identity matrix (DIM) and zero cross-correlation resultant weight (ZCCRW) codes has been performed in terms of log symbol error rate (SER), Q factor, error vector magnitude percentage (EVM%) and log bit error rate (BER) log at different VLC lengths, Q4R1Transmitter half angles (THA), incidence half angles (IHA) and optical concentrators (cm²). Constellations are analysed with and without DSP, and according to the author's best knowledge, a 100 Gbps VLC system for five users covering 6 m at −3.42 log BER is demonstrated for the first time. Results revealed that weight management in WMZCC codes makes its performance improve as compared with ZCCRW and DIM codes.     

100G传输系统中的关键技术及解决方案

在介绍100G WDM系统标准现状的基础上,从传输、调制、映射封装、接口等方面阐述了100G WDM系统的关键技术及解决方案,最后重点介绍了100G WDM系统的关键技术的解决方案。