是用1 310 nm还是用1 550 nm设备

从1310nm和1550nm两个光窗口特点入手，分别介绍了1310nm和1550nm光设备的结构和基本工作原理，并以图表的形式简明扼要地比较了两类光设备的特点和性能，最后从网络性价比的角度以实例介绍了1310nm和1550nm光设备选用的基本原则。     

兴化市有线电视城乡1550nm光纤传输系统联网技术方案

兴化有线电视城乡光纤联网（1310nm系统）于1997年建成，本文通过对光传输1550nm系统与1310nm系统优劣的比较，指出1550nm系统是今后网络发展的方向，此次网络升级改造是在原有1310nm系统的基础上．通过增加1550nm光发射机、光放大器以及线路扩容、加芯等技术手段来有计划分阶段地实施1550nm改造工程，并对回传业务．指标分配．实施步骤等作了简要的论述。     

谈有线电视网络双向化建设和改造(下)

2FTTB+EPON+EoC方案2.1组网方案采用"光纤到楼、光机直带用户、EPON传输、同轴电缆入户、EoC接入"的网络结构。HFC网络传输系统采用860MHz频带,拓扑结构为光链路采用一级1550nm环型光链路、二级1310nm或1550nm星型光     

平原地区农村1550nm光网络及插播技术设计与实践

本文以桐乡市的广播电视传输网络升级改造的实践为例,着重阐述了平原地区农村CATV 1550nm光传输系统的主要设计思路,以及镇村两级信号的1550nm波长和1310nm波长插播方式特点与技术选择。     

采用1550＋EPON技术实现1310nm网络升级改造方案分析

阐述了采用1550＋EPON技术对1310nm有线电视传输网络升级改造的案例,详细分析了采用1550nm＋EOPN技术完成双向网改造的技术优势和可操作性。     

用1550nm波长改造光缆网络遇到的问题

我市在1997年进行了1310nm波长光缆网的改造工作。当时由于受到投资额的限制,其网络规模也相应受到了影响。近期我市已全面规划采用1550nm波长组网,将原有的75台1310nm波长光接收机转换成1550nm波长接收,在转网开通调试过程中,遇到了问题。原有个别老光机送1310nm波长接收光功率在设计范围内为-3～0dBm,RF信号在100dBμV以上。当换上1550nm波长后,光功率电平下降到-6.5dBm(设计的光功率在0dBm以上),RF信号下降到90dBμV以下。     

部署1550 nm广播系统方案心得

在双向网改造中各个分机房的前端平台采用1310 nm广播系统,这个系统主要的2个设备是光接收机及1310 nm光发射机,此系统设备价格成本低、稳定性高,并正常运行多年,随着机房侧因1310 nm光发射机设备过多及机柜空间越来越少等问题,导致后续新添的1310 nm光发射机平台无机房空间部署。本着安全播出及节省成本的情况下,开始摸索前端平台构架1550 nm广播系统方案,前期在城区搭建如图1所示。     

关于1550 nm/1310 nm叠加组网与1310 nm二级光网级联组网的比较

文章通过对光纤有线电视网络采用1550nm/1310nm叠加组网方式的介绍，提出在大中城市对现有1310nm光纤网络改造，拓广，以及开展多功能增值业务带宽扩展的实现方案，并对1550nm直接光放大与1310nm二级级联组网方式的成本造价做出了比较。     

1 550 nm光纤传输系统在城乡联网中的应用

通过对1310nm与1550nm光纤传输系统优缺点的比较，指出了1550nm光纤传输系统是今后网络的发展方向，它适合大范围远距离联网，具有较高的性能价格比。具体探讨了1550nm光纤传输系统在城乡联网应用中的技术方案以及系统设计的步骤，对系统造价进行了粗略的计算。     

1550nm光传联网与城乡有线双向改造

由于历史原因,在原扬州市至邗江区各乡镇的有线电视网络中,北部乡镇采用1550nm光信号联网,杭集、太安两乡镇采用一级1310nm光信号联网,沿江片、洲片各乡镇采用二级DFB1310nm光信号联网.由于乡镇站本身采用的是一级光链路,沿江片、洲片各乡镇采用三级光链路传输,因此信号指标略低.随着邗江区乡镇的合并,该区乡镇广电站减少到14个,为取消乡镇联网中的DFB1310nm中断站、解决停电及指标问题提供了条件.这次改造,除杭集、太安两乡镇外,其余12个乡镇全部采用1550nm光传输平台实现联网.     

Optical fiber amplifiers for telecommunication systems

Optical amplification is of strategic importance for telecommunications. Optical amplifiers compensate for propagation losses in long distance links and branching losses in access networks, at the same time avoiding costly two-way conversions between optical and electrical signals. The devices available up to now are mainly represented by rare-earth-doped active fiber optical amplifiers. This article presents the state-of-the-art of optical amplifiers for telecommunications. However, erbium-doped fibre amplifiers are having a strong impact on the telecommunication market, thanks to the excellent performance of commercial devices. They are widely employed in long distance networks for the third transmission window, which is centered at λ=1550 nm, while in the second window, around λ=1310 nm, the role of semiconductor optical amplifiers is still competitive     

区级有线数字电视网络改造中1550系统的应用

主要分析了1 550系统在区级有线数字电视发展中应用的优势,在原有线电视1 310 nm波长光纤联网的基础上,以1 550 nm波长的光纤系统传输广播电视信号到镇乡和城区节点,以提高传输质量。介绍了掺铒光纤放大器（EDFA）在1 550 nm波长的光纤传输中的应用,论述了改造设计时应注意的问题。     

Ultralow error rate and dispersion-free transmission of 2.5 Gbit/s SONET for gigabit networks

It is demonstrated that for an NRZ modulated 1310 nm optical transmitter, dispersion-free transmission can be achieved up to approximately 250 km using dispersion-shifted singlemode fibre (DS-SMF) and optical pulse compression. This result implies that DS-SMFs have a potential advantage over standard SMFs for dual-window (1310/1550 nm) multigigabit per second transmission systems. Results on the long-term error performance of experimental prototype 2.5 Gbit/s SONET optical transmission systems are presented with measured error rates smaller than 10/sup -15/.<>     

湄潭县有线电视光缆直接延伸覆盖村网的设计

简单介绍县级有线电视前端用1 550 nm光缆直接延伸覆盖村级网络的实施过程中,乡镇机房设备的升级改造、1310 nm光网改为1550 nm的设计思路及工程实例和体会。     

All-optical 1310 to 1550 nm wavelength conversion by utilising nonlinear polarisation rotation in semiconductor optical amplifier

A 1310 to 1550 nm wavelength converter based on nonlinear polarisation rotation in a single semiconductor optical amplifier is demonstrated. Error-free 1310 to 1550 nm wavelength conversion is shown at 20 Gbit/s.     

All-optical 1310 nm WDM to 1550 nm OTDM transmultiplexing

1310 to 1550 nm transmultiplexing based on nonlinear polarisation rotation in a single semiconductor optical amplifier is proposed. Error-free 2/spl times/5 Gbit/s 1310 nm to 10 Gbit/s 1550 nm transmultiplexing is demonstrated.     

Ultrawide-band single-mode transmission performance in a low-loss photonic crystal fiber

We describe the ultrawide-band single-mode transmission performance of a photonic crystal fiber (PCF) in the 850 to 1550 nm wavelength range. We confirmed that the fabricated PCF achieves a single-mode operation over the 850 to 1550 nm wavelength range by measuring the mode-field diameter (MFD) and modal delay characteristics. The 10-Gb/s-based wavelength-division multiplexing (WDM) signals with a total capacity of 190 Gb/s were successfully transmitted over a 5.2-km low-loss PCF utilizing the 850, 1310, and 1550 nm regions simultaneously. Our experimental results show that an endlessly single-mode PCF provides an ultrawide-band of more than 160 THz for future optical communication systems.     

新型低成本色散测试仪的研制

介绍了一种新型的基于普通单模光纤的低成本色散测试仪的研制方法,主要讨论了设计原理,硬件电路的实现及实验结果。通过引入波长为1310nm的参考光,不仅以波长间隔大的1310/1550nmWDM(波分复用/解复用器)代替了波长间隔小的1550nm附近的WDM,而且巧妙地消除了系统随机误差,并在软件部分采用自动校准、多次测量求平均值的方法,保证了测量的精度,具有较高的稳定性和抗干扰能力。     

The Y-laser: a multifunctional device for optical communicationsystems and switching networks

This paper gives a comprehensive review of the recent progress obtained with various operation modes of a Y-shaped all active waveguide device with three optical input/output ports, the so called Y-laser. Used as a monolithic semiconductor light source, single-mode emission with an extremely large cw tuning range of more than 50 nm is accessed. Single current step tuning spans up to 8-nm range. Several-GHz bandwidth AM and FM response is achieved. Operation as a wavelength processing device is demonstrated with data-stream transformation from short wavelength fiber windows (around 780 nm or 1310 nm) to the long wavelength window (1550 nm), as well as with ultra wide range wavelength conversion within the 1550-nm region, across +/-20 nm (blue and red shift). Optical high-speed space switching/gating functions are verified up to 1 Gb/s, and packet switching of 5-Gb/s data streams is demonstrated. Further features as a pulse reshaping device, as an electrically triggerable wavelength bistable device and as a mode locked pulse generator are addressed. Possible applications of this multifunctional device in future optical communication systems and switching networks are discussed     

光波长对光纤弯曲损耗影响的试验与分析

在实验和分析的基础上，描述了光纤在相同的弯曲半径下，传输不同波长的光有不同的弯曲损耗，即传输１５５０ｎｍ波长较１３１０ｎｍ波长光的弯曲损耗要大。