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。     

Capacity-enhanced coarse WDM transmission using 10 Gbit/s sources and DWDM overlay

Three different techniques to increase the transmission capacity of coarse WDM metro-access systems to 100 Gbit/s and upgrade selected channels to 10 Gbit/s operation without sacrificing distance are presented. The transmission performance of all channels is investigated and the impact of system parameters is analysed.     

10 Gbit/s four-channel wavelength- and polarisation-divisionmultiplexing transmission over 340 km with 0.5 nm channel spacing

The authors propose a novel WDM transmission technique combined with polarisation-division multiplexing (PDM) which doubles the frequency utilisation efficiency. This technique is used to transmit a 10 Gbit/s four-channel WDM signal with 0.5 nm channel spacing over 340 km and the signal is demultiplexed using an optical filter having 0.5 nm FWHM and a polarisation beamsplitter     

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     

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.     

中国移动省际光传输网80×40Gbit/s试商用工程

文章给出了中国移动省际光传输网首个80×40Gbit/s试商用系统工程组网建设方案介绍、电路安排设计以及技术设备选择,为今后中国移动基于40Gbit/s基础速率的波分系统推广使用打下一个良好的基础。     

Study of 16 Tbit/s WDM transmission system derived from the CO-OFDM with PDM 16-QAM

In this paper,a wavelength division multiplexing (WDM) transmission system derived from the coherent optical orthogonal frequency division multiplexing (CO-OFDM) with polarization division multiplexing (PDM) and 16-order quadrature amplitude modulation (QAM) is studied. A simulation of 80-channel WDM transmission system with data rate of 200 Gbit/s is built, and the transmission performance of the system is analyzed. The simulation results show that the system Q value of the WDM channels at 16 Tbit/s with a spectral efficiency of 7.14 bit/s/Hz is potentially over 10.0 dB for a long haul transmission up to 1800 km in a standard single-mode fiber.     

3.2 Tbit/s (80 × 40 Gbit/s) phase-shaped binary transmissionover 3 × 100 km with 0.8 bit/s/Hz efficiency

50 GHz-spaced 80 × 40 Gbit/s WDM transmission over 300 km of TeraLight^TM fibre is demonstrated without polarisation demultiplexing, using the PSBT format. A record capacity of 3.2 Tbit/s is thus achieved over the C-band only, with a spectral efficiency of 0.8 bit/s/Hz     

1.6 Tbit/s (40 × 42.7 Gbit/s) WDM transmission over 2400 kmof fibre with 100 km dispersion-managed spans

Transmission of 40 × 42.7 Gbit/s WDM channels is demonstrated over 2400 km of fibre with 100 km amplifier spacing and 100 GHz channel spacing. Dispersion-managed fibre spans, carrier-suppressed return-to-zero modulation format and hybrid Raman/erbium-doped fibre inline amplifiers were employed to achieve a record 40 Gbit/s, WDM transmission distance with 100 km terrestrial span lengths     

640 Gbit/s (32×20 Gbit/s) WDM transmission with 0.4(bit/s)/Hz spectral efficiency using short-period dispersion-managedfibre

640 Gbit/s (32 channel×20 Gbit/s) WDM transmission with 0.4 (bit/s)/Hz spectral efficiency is demonstrated using short-period dispersion-managed fibre (Perfect Cable^TM). The average Q-factor was measured to be better than 18 dB after transmission over 280 km     

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。     

Transmission of 622 Mbit/s spectrum-sliced WDM channel over 60 kmof nondispersion-shifted fibre at 1550 nm

The transmission of a spectrum-sliced WDM channel at 622 Mbit/s over 60 km of nondispersion-shifted fibre using an optical bandwidth of only 0.23 nm is reported. This is the highest single channel bit rate-length product (40 Gbit/s·km) and smallest channel bandwidth reported to date for spectrum-sliced WDM systems. The bit error rate performance is theoretically predicted and experimentally confirmed and limits on the bit rate-length products of spectrum-sliced WDM channels using nondispersion-shifted fibre in the 1550 nm window are given     

Simple and spectrally-efficient design of high capacity hybrid WDM/TDM-PON with improved receiver sensitivity

A simple design of hybrid wavelength division multiplexed/time division multiplexed passive optical network （WDM/ TDM-PON） is demonstrated for the high capacity next generation access （NGA） network, having advantages of both WDM and TDM based PON techniques. A 10 Gbit/s differential quadrature phase shift keying （DQPSK） data signal is used at optical line terminal （OLT） for downstream, whereas a 2.5 Gbit/s inverse return-to-zero （IRZ） data signal with high extinction ratio is used for upstream signal by intensity re-modulation of downstream signal, no additional laser is used at optical network unit （ONU）. Simulation results verify that aggregated 100 Gbit/s downstream transmissions of 10 DQPSK channels and aggregated 25 Gbit/s upstream transmission of 10 IRZ channels, using spectrally-efficient 50 GHz channel spacing, can be successfully achieved over a distance of 20 km with less than 1 dB transmission power penalties and improved receiver sensitivity.     

新型副载波调制EDFA远程在线监控技术的原理论证

从理论和实验上论证了一种用于掺铒光纤放大器 (EDFA)远程在线监控和判断级连EDFA系统级间断点位置的技术方案。该方案利用频移键控 频分复用 (FSK FDM)技术进行声频副载波调制 ,通过光强度调制实现远程在线EDFA监控信息随主信号的传输。实验测得在副载波调制度为 3 %和 15 %时 ,10Gbit s波分复用 (WDM)光传输系统的功率代价分别为 0 16dB和 0 86dB。采用锁相技术 ,成功进行了 3 %调制度的监控信息解调。说明该方案可以实现对 5级EDFA系统的监控     

超高速光时分复用技术实现及发展

以单波道160Gbit／s传输为例，介绍了光时分复用技术的基本原理，对其中的关键技术进行了分断、比较，并对更高速的OTDM传输技术做了探讨。     

Fully transparent multiplexing and transport of 10 GbE-LANPHY signals for 44.6 Gbit/s-based RZ-DQPSK WDM transmission

Transparent 10 GbE-LANPHY transport for 44.6 Gbit/s RZ-DQPSK WDM transmission is demonstrated for the first time. A single-chip 43/44 Gbit/s OTN framer LSI that supports fully transparent STM-64/10 GbE multiplexing and DQPSK precoding is adopted.     

459 km, 2.4 Gbit/s four wavelength multiplexing optical fibre transmission experiment using six Er-doped fibre amplifiers

A 2.4 Gbit/s, four WDM optical fibre transmission experiment over 459 km using six Er-doped fibre amplifiers in the 1.55 mu m wavelength region is presented. The results confirm the possibility of WDM multiple optical amplifier repeater transmission systems.<>     

对波分复用系统扩容方式的探索

对在原有8/16×2.5 Gbit/s波分复用系统中增加或替换少量10 Git/s波道的扩容技术作了介绍,如波分复用终端设备改造方案,扩容工程所应用的技术及测试项目等。     

Dispersion compensated 80 Gbit/s WDM transmission over 1171 kmstandard singlemode fibre

WDM transmission experiment at 80 Gbit/s (8×10 Gbit/s, 0.8 nm channel spacing) over 1171 km of standard singlemode fibre has been performed with a 90.1 km recirculating loop incorporating a dispersion compensation fibre and gain-equalising optical bandpass filters     

Ultra-long-span 500 km 16/spl times/10 Gbit/s WDM unrepeatered transmission using RZ-DPSK format

Ultra-long-span 500 km 16/spl times/10 Gbit/s WDM unrepeatered transmission without dedicated fibre for remote pumping is successfully demonstrated for the first time. Enabling technologies are the RZ-DPSK format, forward pumped Raman amplification, and second-order backward pumped Raman amplification in combination with enlarged effective area SMF and conventional SMF.