TN64 10 Gbit／s传输平台与多波长光放大器

北电网络是第一个向市场提供１０Ｇｂｉｔ／ｓＳＯＮＥＴ／ＳＤＨ产品并通过单纤双向密集波分复在一根光纤上传输的供应商边套系统与已敷设的光纤完全兼容。目前,１０Ｇｂｉｔ／ｓＳ／ＤＭＳ传输系统系统与ＤＷＤＭ结合在一起,能够提供３２０Ｇｂｉｔ／ｓ的容量。     

光纤以太网及其应用

光纤以太网产品可以借助以太网设备采用以太网数据包格式实现ＷＡＮ通信业务 ,该技术可以适用于任何光传输网络———光纤直接传输、ＳＤＨ以及ＤＷＤＭ网络传输。目前 ,光纤以太网可以实现１０Ｍｂｉｔ／ｓ、１００Ｍｂｉｔ／ｓ以及１Ｇｂｉｔ／ｓ等标准以太网速度 ,而达到１０Ｇｂｉｔ／ｓ后它更将成为各种业务的亮点。迄今为止 ,基本接入端口速度为１０／１００Ｍｂｉｔ／ｓ ,而最终用户以１Ｍｂｉｔ／ｓ或１０Ｍｂｉｔ／ｓ为单位来使用网络。光纤以太网业务与其它宽带接入（例如ＤＳ３）相比更为经济高效 ,但到目前为止它的使用只限于办…     

朗讯科技的先进光通信技术

３．２８Ｔ ＤＷＤＭ试验系统 在用２０００年初在美国召开的世界光纤通信会议ＯＦＣ’２０００上,朗讯科技的３．２８Ｔｂ／ｓ ＤＷＤＭ试验系统是所有参会公司系统中容量最大的系统。其特点如下： 系统单波长速率为４０Ｇｂｉｔ／ｓ,共８２个波长,光滤波器波长间隔为１００ＧＨｚ。 系统工作于Ｃ和Ｌ两个波段,分别容纳４０和４２个波长通道。 系统传输距离３００公里,采用真波光纤,中间放大（Ｅ／Ｒ—ＯＡ）跨距１００公里。 光纤线路的色散补偿要分别对Ｌ、Ｃ波段补偿ＤＣＦ、ＨＳ—ＤＣＦ,分别为补偿光纤和高斜率补偿光纤。 系统…     

信息站点2

朗讯科技ＴＤＭ１０Ｇｂｉｔ／ｓ系统在我国首次开通北京电信２０００年传输骨干网络扩容一期工程采用了朗讯科技的ＷａｖｅＳｔａｒＴＭＴＤＭ１０Ｇｂｉｔ／ｓ等先进的光网络设备 ,这是该系统首次在中国投入使用。北京电信在本地网中大规模引入１０Ｇｂｉｔ／ｓＳＤＨ设备 ,这在国内处于领先地位。北京电信２０００年传输网扩容二期工程也已决定采用朗讯科技的ＷａｖｅＳｔａｒＤＡＣＳ４／４／１,ＴＤＭ１０Ｇ（ＯＣ１９２） ,ＡＤＭ１６／１,ＡＤＭ４／１和ＩＴＭ -ＳＣ等设备。 (正 )爱立信推出针对ｃｄｍａ２０００的分组核心网解决方…     

北电网络为浙江省网提供10Gbit/s传输产品

近日 ,北电网络公司与浙江省邮电管理局签定了价值６００万美元的合同 ,为浙江省网提供１０Ｇｂｉｔ／ｓ产品。该项目除了采用１０Ｇｂｉｔ／ｓ的ＴＤＭ设备 ,还采用了北电网络的ＯＰＴｅｒａＬＨ产品 ,ＯＰＴｅｒａＬＨ是一个独特的开放式平台 ,既可以提供集成式ＤＷＤＭ系统 ,也可以提供与其它厂商ＳＤＨ设备兼容的波长转换器 ,以构成开放式的ＤＷＤＭ系统。北电网络为浙江省网提供10Gbit/s传输产品     

在793.2km G.652光纤上的10 Gbit/s传输实验

介绍了国内首次在７９３．２ｋｍＧ．６５２光纤上进行的１０Ｇｂｉｔ／ｓ系统传输实验,本次实验使用武汉邮电科学研究院研制的１０Ｇｂｉｔ／ｓＳＤＨ设备,以及１０只ＥＤＦＡ与补偿量为７２０ｋｍ的色散补偿光纤,实验结果表明：在误码率ＢＥＲ＝１０＾－１２接收灵敏度可达到－１８．８ｄＢｍ,传输实验的通道代价为０．４ｄＢ。     

北电网络为浙江省网提供10Gbit/s传输产品

北电网络公司继今年１１月正式通过信息产业部专家组对其１０Ｇｂｉｔ／ｓ传输产品的联合测试后,近日又与浙江省邮电管理局签署了价值６００万美元的合同,根据合同,北电网络将为浙江省网提供１０Ｇｈｉｔ／ｓ产品。 浙江省省网干线项目中除了 １０Ｇｂｉｔ／ｓ ＴＤＭ设备外,还采用了北电网络的ＯＰＴｅｒａ ＬＨ产品,从而使浙江省成为中国大陆第一个应用该平台的用户。 ＯＰＴｅｒａ ＬＨ是一个独特的开放式平台,它既可以提供集成式ＤＷＤＭ系统,也可以提供与其他厂商ＳＤＨ设备兼容的波长转换器（ＯＴＵ）,以构成开放式的ＤＷＤＭ…     

大唐电信40×10Gbit/sDWDM设备再获应用

在日前启动的广州市重点建设项目———广州宽带网络首期工程建设中 ,大唐电信４０×１０Ｇｂｉｔ／ｓＤＷＤＭ技术和１０Ｇｂｂｉｔ／ｓＳＤＨ技术被应用于本次工程骨干内环的建设。大唐１６×１０Ｇｂｉｔ／ｓＤＷＤＭ设备具有丰富的业务接口 ,能实现各种速率的ＳＤＨ、ＰＤＨ、以太网、ＡＴＭ交换机及ＩＰ路由器 ;１０Ｇｂｉｔ／ｓ的ＯＴＵ波长变换单元具有强大的ＦＥＣ能力及先进的数字包封技术 ;整个系统对色散进行严格控制。由于整个波分复用系统采用模块化设计 ,系统仅通过增加复用器、解复用器模块便可实现１．６Ｔｂｉｔ／ｓ（１６…     

用于10Gbit／sSDH光传输系统的光接收机

本文介绍了一种用于１０Ｇｂｉｔ／ｓＳＤＨ光传输系统的光接收机。该接收机的光接口指标可满足ＩＴＵ－ＴＧ．ＳＣＳ建议的要求。已将该接收机用于１０Ｇｂｉｔ／ｓ光纤传输实验。     

10G密集型波分复用系统的技术考虑

本文将讨论１０Ｇｂｉｔ／ｓ传输特性,特别是其在ＤＷＤＭ系统中传输产生的新问题,提出了一些解决方案,并从各个方面将１００Ｇｂｉｔ／ｓＤＷＤＭ系统与２．５Ｇｂｉｔ／ｓＤＷＤＭ系统作了比较．     

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。     

Transmission performance of implicit optical label switching system with coherently detected spectral amplitude code labels

A new optical label switching system with coherently detected implicit spectral amplitude code (SAC) labels is proposed in this paper. The implicit SAC labels are recognized using a frequency-swept local light source oscillator. An explicit SAC-label switching system with 40 Gbit/s intensity modulation (IM) payloads and 156 Mbit/s label and an implicit SAC-label switching system with 2.5 Gbit/s IM payloads and 156 Mbit/s label are both considered. Label and payload bit error rate (BER) performance is assessed and compared by simulations. The results reveal that after 80 km transmission and at the BER of 10-9, the received optical power (ROP) values of label and payload are -8.3 dBm and -23.5 dBm in implicit SAC-label switching system, respectively, while those are -18.2 dBm and -18.6 dBm in explicit SAC-label switching system, respectively. As a result, the payloads of 40 Gbit/s and 2.5 Gbit/s in explicit/implicit SAC-label switching system have little influence on the received payload quality at the BER of 10-9 after 80 km transmission. Finally, a payload of 40 Gbit/s can obtain 12.5 dB optical signal-to-noise ratio (OSNR) after 80 km transmission.     

Gbit/s transmission experiments with a 1.3 ?m high-speed surface-emitting LED and multimode graded-index fibre

Using a 1.3 ?m wide-bandwidth surface-emitting LED, transmission experiments were performed with 50/125 ?m multimode, graded-index fibre. Pulse shaping and equalisation were used in achieving a 10-9 bit-error rate at 1.0 Gbit/s over 3.0 km with a system margin of 1.1 dB. At 500 Mbit/s the margin increased to 7.0 dB. The 3.0 Gbit km/s data rate-distance product represents a new level of performance for a surface-emitting LED and multimode fibre.     

10Gbit/s甚短距离并行光传输模块与实验系统

介绍符合OIF-VSR4-03.0规范的10Gbit/s甚短距离(VSR)实验系统研究.该系统由16×622Mbit/s到4×2.488Gbit/s转换集成电路、自制12通道850nm垂直腔面发射激光器(VCSEL)并行光发射模块和商用12通道并行接收光模块构成.用一片FPGA实现转换芯片的全部功能,采用基于二分查找法的SDH STM-64/OC192 并行帧对齐及同步算法,大大提高了转换芯片的工作速度和节省了逻辑资源,自制12通道VCSEL并行发射模块工作速率达到12×2.488Gbit/s的设计指标.在SDH STM-64/OC192 10Gbit/s测试仪点到点的传输系统测试中,采用5米的12芯400MHz·km 62.5μm多模带状光纤互联,系统误码率低于1×10^-14.     

Wavelength-tunable 16 optical channel transmission experiment at 2Gbit/s and 600 Mbit/s for broadband subscriber distribution

Reports a 16 optical-channel single-mode fibre transmission experiment based on dense-WDM and tunable-etalon channel selection. Experiments at 2 Gbit/s and 600 Mbit/s over 10 km of single-mode fibre show little crosstalk penalty when the optical channel spacing is 2 nm. The system architecture is useful for high-capacity broadband subscriber distribution     

1 Gbit/s transmission experiment over 101 km of single-mode fibre using a 1.55 ?m ridge guide C3 laser

Using a cleaved-coupled-cavity (C3) ridge guide laser which oscillates in a single longitudinal mode at 1.55 ?m wavelength, we report the first lightwave transmission experiment exploying single-frequency lasers at speeds above 500 Mbit/s. We have achieved digital transmission with a bit-error rate of 2 × 10?10 at 1.0 Gbit/s over 101 km of single-mode fibre. This represents a record for the length of unrepeatered optical transmission for bit rates greater than 500 Mbit/s. Evidence for an error-rate floor, presumably due to residual partition noise, is observed. No such floor was observed in an 84 km?1 Gbit/s experiment using the same C3 laser.     

High-speed optical pulse transmission at 1.29-µm wavelength using low-loss single-mode fibers

Optical-fiber transmission experiments in the 1.3-μm wavelength region are reported. GaInAsP/InP double-heterostructure semiconductor laser emitting at 1.293 μm is modulated directly in nonreturn-to-zero (NRZ) codes at digit rates tanging from 100 Mbit/s to 1.2 Gbit/s. Its output is transmitted through low-loss GeO2-doped single-mode silica fibers in 11-km lengths. Transmitted optical signals are detected by a high-speed Ge avalanche photodiode. Overall loss of the 11-km optical fibers, including 11 splices, is 15.5 dB at 1.3 μm. Average received optical power levels necessary for 10^-9error rate are -39.9 dBm at 100 Mbit/s and -29.1 dBm at 1.2 Gbit/s. In the present system configuration, the repeater spacing is limited by loss rather than dispersion. It seems feasible that a more than 30 km repeater spacing at 100 Mbit/s and a more than 20 km even at 1.2 Gbit/s can be realized with low-loss silica fiber cables, whose loss is less than 1 dB/km. Distinctive features and problems associated with this experimental system and constituent devices are discussed.     

Power budget optimisation of WDM network with MSCM control

The authors have experimentally demonstrated a 28.7 dB power budget for simultaneous transmission of 2.5 Gbit/s/node payload data and 80 Mbit/s/node control channels using the multichannel subcarrier multiplexing (MSCM) signalling technique. The power budget is sufficient to support a 234 node MSCM-WDM network with 2.5 Gbit/s/node 10 km radius coverage and 0.25 dB/km fibre attenuation with 0.45 dB/km attenuation, the network can support up to 93 nodes     

Analysis of power budget performances of digital transmissionsystems with an optical amplifier

Explicit expressions for the power budget of a direct detection transmission system when an optical amplifier changes its location along the span are presented. The analysis is in good agreement with experimental data obtained at 565 Mbit/s and 2.5 Gbit/s     

2 Gbit/s and 600 Mbit/s single-mode fibre transmission experiments using a high-speed Zn-doped 1.3 ?m edge-emitting LED

High-speed heavily Zn-doped mesa-structure 1.3 ?m edge-emitting LEDs have been developed for single-mode-fibre high-speed transmission. A 600 Mbit/s modulation without waveform equalisation, and a 2 Gbit/s modulation with equalisation, have been performed. At 2 Gbit/s, 9.8 km of single-mode-fibre transmission using the edge-emitting LED has been carried out for the first time.