支持40 Gbit/s路由器的传输技术研究

本文介绍了核心路由器40 Gbit/s高速接口的优点和传输系统为支持40 Gbit/s路由器所做的努力.例如40 Gbit/s WDM(波分复用)传输技术、40 Gbit/s IMUX(反向复用)技术等.在介绍这些技术的发展现状和优缺点的基础上,本文对40 Gbit/s传输技术的发展进行了预测.     

1.6 Tbit/s(40×40 Gbit/s)光通信传输系统

在国家自然科学基金网(NSFCNet)上已实现由400 km×10 Gbit/s传输链路直接升级的一路400 km×40 Gbit/s光传输实验的基础上,采用自行研制的40×40 Gbit/s载波抑制归零(CS-RZ)码多波长光发送源,进行了160 km的1.6 Tbit/s(40×40 Gbit/s)波分复用(WDM)光传输实验。实验结果表明,对于常规中短距离10 Gbit/s传输链路可以直接升级至40 Gbit/s。但是由于40 Gbit/s传输系统的色散容限小于60 ps/nm,而且传输光纤与色散补偿模块的色散斜率不匹配,要实现40通道40 Gbit/s的传输,必须对40个信道分别进行精细的色散补偿。这也说明,对于宽带的40 Gbit/s多波长系统,有必要优化设计或更新传输链路。     

40G WDM系统应用研究

结合运营商网络需求特点,通过对技术方案、设备和线路参数的分析,提出了40GWDM系统在长途传输网上的码型选择和色散管理建议,分析并提出了在WDM和路由器设备间40G互联接口采用OTU3信号格式的建议和长距离客户侧光接口的解决方案     

100 Gbit／s超高速系统的发展及展望

高清视频和高速数据业务的迅速发展对网络的带宽需求越来越高。一些领先的运营商已经开始规模建设单波道40Gbit／s的DwDM网络,还有运营商开始关注单波道100Gbit／s的超高速传送系统。目前全球有三个标准组织ITU-T、IEEE和OIF正在积极制定100Gbit／s的相关标准,并有了较详细的计划。未来100Gbit／s系统将首先在大容量核心路由器之间的互联,以及长途和地区间的传送网两个场景使用。但是100G从设备成熟度、标准以及运营管理维护等方面都需要不断完善。真正大规模商用还需几年。     

1 Tbit/s (111 Gbit/s/ch X 10 ch) no-guard-interval CO-OFDM transmission over 2100 km DSF

Spectrally efficient (2bit/s/Hz) 1 Tbit/s DWDM transmission of 111 Gbit/s no-guard-interval PDM CO-OFDM signals with 50 GHz spacing over DSF is demonstrated. The record transmission distance of 2100 km was achieved for a 100 Gbit/s-data-rate CO-OFDM system.     

2 Gbit/s and 2.4 Gbit/s optical transmission field trial over a 32 km installed route

High-speed optical data transmission at 2Gbit/s and 2.4 Gbit/s has been demonstrated for the first time over an installed fibre-optic cable. Error-free transmission with operating margins of 15.8 dB and 12 dB over 10?9 BER was achieved over a 32 km route. The systems featured a 1.5 ?m DFB laser, Ge APD transimpedance receivers and full regeneration.     

200Gbit/s PAM4光发射组件封装技术研究

针对200Gbit/s PAM4光收发模块的设计需求,提出了一种基于四阶脉冲幅度调制(PAM4)、数据传输速率达200Gbit/s的光发射组件封装方案。该封装内部集成了4路PAM4电/光转换通道,单通道数据传输速率为50Gbit/s。介绍了该200Gbit/s PAM4光发射组件的组成和技术难点,然后对其中的50Gbit/s数据传输通道进行了建模、仿真和优化,最后完成了样品的测试。测试结果表明:样品的单通道PAM4数据速率可达50Gbit/s,整体PAM4数据速率可达200Gbit/s,满足光收发模块的设计需求。     

40 Gbit/s(STM-256)SDH光纤传输设备的研究

随着信息传输需求的迅速增长,40 Gbit/s光传输成为下一代通信网的必然选择.文章阐述了40 Gbit/s(STM-256) SDH光纤传输设备的基本原理和组成结构,分析了实现40 Gbit/s(STM-256) SDH设备需要采用的关键技术,介绍了烽火通信科技股份有限公司40 Gbit/s SDH设备的最新研究成果.     

40 Gbit/s波分复用系统光转发单元的实现

利用子速率复用方案,研制了40Gbit／s密集波分复用系统的光转发单元,并进行了测试,测试结果表明该单元达到了设计要求。     

NTT ultra-fast,large-capacity optical transmission at 400 Gbit/s

By combining optical time-division-multiplexing (TDM) and wavelength division-multiplexing (WDM) with a single super-continuum light source NTT Corp. has successfully conducted an ultra-fast, large-capacity optical transmission experiment at 400 Gbit/s (equivalent to sending 100 years of newspapers in a second) over a distance of 100 km. Having already confirmed that the PLL timing extraction circuit and all optical time-division demultiplexer are able to function at 400 Gbit/s and 200 Gbit/s, respectively, NTT plans to continue R&D efforts to develop an optical transmission system exceeding 1 T bit/s.     

300脚MSA 10 Gbit/s Transponder模块

分析了开发10Gbit/sTransponder模块的必然性，介绍了10Gbit/sTransponder模块的原理、特点和参数指标。并且用开发出的两只40km300脚10Gbit/sTransponder模块成功地进行了43km的无误码传输试验和测试。     

超100G传输关键技术研究

N×100Gbit/sWDM系统已经趋于成熟并逐渐开始引入规模商用。网络带宽的持续快速增长促使骨干光传送网在未来向更高的传输速率演进。本文分析了超100Gbit/s的关键技术,并对未来超100Gbit/s技术发展的路线选择进行了探讨。     

40Gbit/s DWDM系统传输性能评价研究

随着各大运营商40Gbit/s DWDM系统的部署,对40Gbit/s DWDM系统性能的评估是目前研究的热点。本文基于相关网络建设的经验,针对40Gbit/s DWDM系统的长途传输能力、性能参数提出了一套论证方法。     

40Gbit/s高速光传输技术的应用与挑战

简要分析了40Gbit/s高速光传输技术的发展背景和应用现状 深入分析了对其面临的挑战,例如现网光纤PMD对其传输距离的限制,持续降低成本的挑战,与100Gbit/s的分工和竞争等 最后对其发展进行了展望。     

基于DQPSK的40Gbit/sWDM系统传输性能研究

40 Gbit/s波分复用系统已开始商用,在这种系统中,差分正交相移键控（DQPSK）比开关键控有更高的谱效率并且对色散和偏振模色散等有更高的鲁棒性。文章从40 Gbit/s波分复用系统传输性能要求入手,对DQPSK的原理和实现方式进行了分析,并用精确的仿真验证了40 Gbit/s DQPSK系统的传输性能。     

16 Gbit/s fibre transmission experiment using optical time-division multiplexing

An experimental four-channel optical time-division multiplexed transmission system is described, and the first demonstration of fibre transmission at a bit rate of 16Gbit/s is reported. In this experiment, data at 16Gbit/s have been transmitted over 8 km of fibre with a bit error rate below 10-9.     

预啁啾技术在2.5Gbit／s光传输系统中的实现

本文介绍了２．５Ｇｂｉｔ／ｓ光传输系统中预啁啾技术的实现，并对２．５Ｇｂｉｔ／ｓ光传输系统中的啁啾和自相位调制进行了理论分析，为高速光传输系统的研究提供了参考。     

Dispersion-free single-mode fibre transmission experiments up to 1.6 Gbit/s

Long-span single-mode fibre transmission experiments at 1.3 ?m have been refined toward higher digit rate and longer fibre span. Error-rate against receiving optical level characteristics showed that optical power penalties at 100 Mbit/s, 1.2 Gbit/s and 1.6 Gbit/s are negligible, even after 30 km, 23 km and 13 km fibre transmission, respectively.     

High performance 10 Gbit/s pin-FET optical receiver

An optical receiver suitable for a 10 Gbit/s direct detection optical transmission system is described. It uses a pin diode, commercial GaAs MESFETs and hybrid construction techniques on a coplanar substrate. The measured sensitivity of the receiver is -20.4 dBm, which is the best reported sensitivity at 10 Gbit/s for a pin-FET optical receiver to date.<>     

Gbit/s modulation of heavily Zn-doped surface-emitting InGaAsP/InP DH LED

Pulse-response characteristics for a heavily zinc-doped surface-emitting InGaAsP/InP DH LED have been studied. 1.6 Gbit/s NRZ modulation has been achieved, and the feasibility of using the surface-emitting LED in a Gbit/s transmission system has been studied.