25 Gbit/s无源光网络技术进展和实验研究

高清视频、虚拟现实等新业务的产生以及PON传输5G移动前传和回传信号的需求,要求PON能支持单波超过10 Gbit/s速率的传输.当线路速率超出10 Gbit/s时,色散和功率预算成为限制系统性能的主要因素.介绍了25 Gbit/s PON系统的研究进展和存在的问题,并对采用基于零色散附近的25 Gbit/s速率的EML、分别基于25 Gbit/s和10 Gbit/s速率的APD接收机进行了实验研究.实验结果表明,采用25 Gbit/s速率的APD,EML的发射光功率设置为+5 dBm,在没有光放大器的情况下,可以达到10 Gbit/s对称的吉比特无源光网络的32 dBm的N2级别的光功率预算.     

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。     

10Gbit/s并行光收发模块在万兆以太网的应用

介绍了万兆以太网技术（10 gigabit ethernet technology) . 万兆以太网使用以太网结构实现10Gbit/s点对点传输，距离可达到40km，使以太网的应用从局域网扩展到城域网和广域网. 重点介绍了万兆以太网的功能结构、分层结构、物理传输介质和甚短距离（very short reach）网络传输的并行光传输系统在万兆以太网方面的应用.     

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。     

10 Gbit/s data modulation using 1.3 /spl mu/m InGaAs quantum dot lasers

Error-free 8 and 10 Gbit/s data modulation with quantum dot lasers emitting at 1.3 /spl mu/m is presented. 12 Gbit/s open eye patterns are observed. An integrated fibre-optic QD laser module yields error-free data modulation at 10 Gbit/s at a receiver power of -2 dBm.     

All-Optical 10 and 40 Gbit/s RZ-to-NRZ Format and Wavelength Conversion Using Semiconductor Optical Amplifiers

We demonstrate that the cross-gain compression (XGC) in a semiconductor optical amplifier can produce effective return to zero (RZ)-to-nonreturn to zero (NRZ) format conversion. This technique is experimentally investigated at 10 and 40 Gbit/s. At 10 Gbit/s, the format adaptation allows for a very high pulsewidth increase, i.e., from 10 to 100 ps. The output 10 Gbit/s NRZ signal is transmitted on metro-like links with no chromatic dispersion compensation.      

Physical Media Dependent Prototype for 10‐Gigabit‐Capable PON OLT

In this work, we study the physical layer solutions for 10‐gigabit‐capable passive optical networks (PONs), particularly for an optical link terminal (OLT) including a 10‐Gbit/s electroabsorption modulated laser (EML) and a 2.5‐Gbit/s burst mode receiver (BM‐Rx) in a novel bidirectional optical subassembly (BOSA). As unique features, a bidirectional mini‐flat package and a 9‐pin TO package are developed for a 10‐gigabit‐capable PON OLT BOSA composed of a 1,577‐nm EML and a 1,270‐nm avalanche photodiode BM‐Rx, including a single‐chip burst mode integrated circuit that is integrated with a transimpedance and limiting amplifier. In the developed prototype, the 10‐Gbit/s transmitter and 2.5‐Gbit/s receiver characteristics are evaluated and compared with the physical media dependent (PMD) specifications in ITU‐T G.987.2 for XG‐PON1. By conducting the 10‐Gbit/s downstream and 2.5‐Gbit/s upstream transmission experiments, we verify that the developed 10‐gigabit‐capable PON PMD prototype can operate for extended network coverage of up to a 40‐km fiber reach.     

OTN承载以太网业务方式的探讨

以太网技术的应用正在由局域网延伸到城域网甚至广域网中,相应的以太网带宽也逐渐增加,40 GE/100 GE标准都已在进行讨论.本文首先简单介绍了OTN技术,然后讨论并比较了已有GE/10 GE业务映射到0TN净荷中的可行方式及未来出现的40 GE/100 GE业务映射到OTN净荷中的可能方式.     

High performance 10-12.5 Gbit/s modulator driver in InP SHBT technology

A high performance modulator driver circuit is presented using 4" InP SHBT technology. The IC was developed for driving EAM modulators in OC-192 (10 Gbit/s) and with forward error correction (FEC: 10.7 Gbit/s or 12.5 Gbit/s) optical fibre systems. The monolithic integrated circuit features output amplitude control, output crossing point control and output DC offset control. Measured results show the circuit operates at 10 to 12.5 Gbit/s with a swing of 3.1 V/sub p-p/ at each output and 20/18 ps rise/fall times. The power dissipation is 1.4 W with a standard power supply of -5.2 V.     

40 Gbit/s WDM系统在长途骨干网中的应用

随着业务的爆炸式增长,40 Gbit/s WDM(波分复用)系统已经在现有骨干网中大规模商用。文章分析了40 Gbit/s系统工程建设中的相关问题,包括40 Gbit/s系统的光纤选型、编码选择、40 Gbit/s系统中10 Gbit/s业务的解决方案、40 Gbit/s系统的OLP(光线路保护)和客户端解决方案。     

2010年光网络热点及未来展望

2010年,在光通信领域,OTN组网技术、40Gbit/s和100 Gbit/s超高速技术以及10 Gbit/sPON等新兴技术取得了突破性的进展。未来几年,上述技术将继续成为光通信领域的发展重点。     

10Gbit/s SFP+光收发模块

文章报道一种10 Gbit/s SFP+(加强型小型化可热插拔)光收发模块.该模块由TOSA(光发送子系统)、ROSA(光接收子系统)和控制电路组成,实现了SFP+的智能化控制和模块状态监测功能.依照SFF-8431(多源协议)对该模块进行了测试,结果表明,该模块满足10 Gbit/s以太网的应用要求,且最高可支持11.3 Gbit/s的速率.     

40Gbit/s DWDM系统光路调度试验及OLP试验总结

随着40Gbit/s路由器的正式商用,中国电信从2009年中开始大规模建设单波速率40Gbit/s的高速率波分系统。40Gbit/s系统较10Gbit/s系统,有着更严格的色散要求,40Gbit/s系统除了要求固定色散补偿模块配置准确外,还在OTU上配置了色散可调模块TDC（Tunable Dispersion Compensator）,进行色散精确调整。由于TDC在全局搜索时,会引起业务的较长时间中断,因此40Gbit/s系统的业务恢复与10Gbit/s系统有较大的区别。本文就40Gbit/s波分系统的调度及OLP保护对业务的影响进行了探讨。     

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.     

2×10 Gbit/s WDM 1310-nm optical transmission over 63.5-kmstandard single-mode fiber using optical preamplifiers

Twenty Gbit/s transmission over 63.5 km SMF at 1310 nm is reported by using two channel 10 Gbit/s wavelength (de)multiplexing (Δλ=1.5 nm). Two 1310 nm SL-MQW semiconductor optical amplifiers are utilized for loss compensation and sensitivity improvement. For the 1310 nm wavelength domain, a record bitrate x distance product of 1.27 Tbit/s.km has been obtained. Crosstalk penalties are identified, and the feasibility of an extension up to at least four, 10 Gbit/s channels is discussed     

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。     

基于平板光波导任意带宽比的新型非对称交错滤波器

为了提高目前光纤通信系统的10 Gbit/s和40 Gbit/s混合系统的传输效率,提出了一种新型的器件结构以实现基于平面光波导的不等带宽交错滤波器。该结构结合光学微环与马赫曾德尔干涉仪结构,通过控制相关关键参数,实现了任意带宽比的光学交错滤波器,给出了带宽比为12的非对称交错滤波器设计实例。仿真结果表明,设计的交错滤波器在信道间隔为100 GHz的系统中给传输速率为10 Gbit/s和40 Gbit/s的两个信道分别分配了32.85 GHz和67.15 GHz的带宽,从而解决了传输速率为40 Gbit/s的信道带宽不足的问题。在此基础上通过分析器件中各双模干涉仪的光功率分配比对输出谱带宽比的影响,给出了在相同信道间隔条件下不同带宽比的非对称交错滤波器的设计实例。     

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。     

A novel duplex WDM-PON with DPSK modulated downstream and re-modulation of the downlink signal for OOK upstream

We experimentally demonstrate and analyze a 10 Gbit/s full duplex wavelength division multiplexing passive optical network (WDM-PON) system. A non-return-to-zero differential phase shift keying (NRZ-DPSK) modulation technique is first utilized for downlink direction, and then the downlink signal is re-modulated for the uplink direction using intensity modulation technique of on-off keying (OOK) with a data rate of 10 Gbit/s per channel. An effective colorless WDM-PON full duplex transmission system is achieved for the data rate of 10 Gbit/s per channel with a channel spacing of 60 GHz over the distance of 25 km with low power penalty.     

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.