新时期光接收机的发展方向

介绍了当今广电光接收机的发展方向,包括低光功率接收、高电平输出和一体机等,就新时期怎样选择光接收机及光接收机的各种发展动向提出了自己的看法。     

EPON中LLID配置方式

在介绍以太网无源光网络的基础上,阐述了系统中LLID的两种分配方式,LLID/ONU和LLID/Queue.分析了两种配置方式的工作原理,比较了两者的优缺点.LLID/Queue的配置方案在实现和应用上优于LLID/ONU.     

下一代多波长光接入网关键技术分析

介绍了WDM-PON系统的基本结构以及运行原理,重点分析和探讨了其中涉及到的关键技术,主要包括多波长光源、波分复用器、ONU光源、接收机等光器件方面的问题.此外,还对光网络的保护和恢复以及如何承载广播业务等关键问题进行了深入探讨.最后,分析了WDM-PON未来的研究方向,并提出了应用前景.     

PON网络设计思路探讨

目前,传统运营商已开始了PON(无源光网络)的大规模商用部署,新兴运营商也已开始利用PON实现综合接入以提供新业务。文章从PON的相关定义入手,提出PON设计流程。分别从OLT(光线路终端)设置方式、ODN(光分配网)组网方式(分光器设置,馈线、支线光缆配置,ONU〔光网络单元〕设置等)、光通道衰减核算、经济效益分析等方面,提出PON网络的一些设计思路。     

A Transparent,Smooth, Thermally Robust,Conductive Polyimide for Flexible Electronics

In this work, a thermally and mechanically robust, smooth transparent conductor composed of silver nanowires embedded in a colorless polyimide substrate is introduced. The polyimide is exceptionally chemically, mechanically, and thermally stable. While silver nanowire networks tend not to be thermally stable to high temperatures, the addition of a titania coating on the nano­wires dramatically increases their thermal stability. This allows for the polyimide to be thermally imidized at 360 °C with the silver nanowires in place, creating a smooth (<1 nm root mean square roughness), conductive surface. These transparent conducting substrate‐cum‐electrodes exhibit a conductivity ratio figure of merit of 272, significantly outperforming commercially available indium‐tin‐oxide (ITO)‐coated plastics. The conductive polymide is subjected to various mechanical tests and is used as a substrate for a thermally deposited, flexible, organic light‐emitting diode, which shows improved device performance compared to a control device made on ITO coated glass.     

基于ONU和OLT休眠-唤醒模式的WDM-PON绿色接入网

提出了基于ONU和OLT休眠-唤醒节能工作模式的WDM-PON绿色接入网设计.介绍了WDM-PON的节能原理及0LT、ONU的休眠模式和唤醒模式.当休眠模式时间和唤醒模式时间分别设置为20ms和2ms时,每个OLT PON线路卡和ONU家庭路由器可以有效减少约70％的功率消耗.     

Simulation of fiber to the home triple play services at 2 Gbit/s using GE-PON architecture for 56 ONUs

This paper evaluates and compares FTTH (Fiber To The Home) GEPON (Gigabit Ethernet Passive Optical Network) link design for 56 subscribers at 20 km reach at 2 Gbps bit rate. A 1:56 splitter is used as a PON (Passive Optical Network) element which creates communication between a Central Office to different users and. A boosting amplifier is employed before fiber length which tends to decrease BER and allows more users to accommodate. This architecture is investigated for different values of data rate from a CO (Central Office) to the PON in terms of BER (Bit Error Rate). The simulation work reports BER of 4.5246e−009 at 2 Gbit/s systems for the case of 56 users and if we further increase data rate of system say 5 Gbps, then we observe a sharp increase in BER. Similarly in the variation of BER with respect to transmission distance, we observe that BER shows an increase in its value as transmission distance increases.     

无源光网络冗余保护及应用实现

PON网络相对于传统网络组网简单,无源传输,提供可观接入速率和多业务应用,得到了蓬勃发展。通过对PON网络组网结构以及业务特征的定性研究,分析了PON网络中不同保护方式对应的应用场景。并对在网络设计中考虑保护以及在组网各个节点进行冗余保护以及提升网络运行稳定性,提高用户体验感知的有效方法进行了总结。并对特殊应用下的PON网络结合和冗余保护实现进行分析总结。     

基于MZM的再调制单纤双向高速WDM-PON

研究了采用MZM实现再调制的高速WDM-PON方案,通过在Optisystem8.0仿真软件中搭建网络,对基于RSOA和MZM的两种单纤双向再调制WDM-PON进行了比较研究,仿真分析1.25Gb/s、2.5Gb/s和10Gb/s双向对称速率的上行传输性能,证明了基于RSOA的WDM-PON可实现低速远距离传输,而MZM再调制方式则更适合于高速短距离传输应用.     

基于EPON的新型电力ONU的设计与应用

结合居民用电信息采集系统的需求及EPON技术的优点,设计了新的信息采集流程.详细介绍了一种具有实时信息采集功能的电力ONU的设计实现方法,其特点是采用了实抄与预抄相结合的软件方案.测试结果表明,系统平均响应时间在500ms以内.