江苏邮电规划院杨红伟:ODN二级分光优势渐显

分光器作为PON网络中ODN部分重要组成设备,其部署方式的差异直接影响光缆的造价、PON系统的利用率,甚至整个PON网络的部署。江苏省邮电规划设计院杨红伟从设计的角度,深度分析了ODN建设模式中分光器的部署模式。     

江苏邮电规划院杨红伟:ODN二级分光优势渐显

分光器作为PON网络中ODN部分重要组成设备,其部署方式的差异直接影响光缆的造价、PON系统的利用率,甚至整个PON网络的部署。江苏省邮电规划设计院杨红伟从设计的角度,深度分析了ODN建设模式中分光器的部署模式。     

中国电信千兆宽带接入网用户带宽模型探讨

当前,EPON/GPON作为宽带接入网的主要接入方式,当用户带宽速率持续提升的情况下,接入带宽往往不能满足需求.从E/GPON向10G PON网络升级演进中,本文根据10G PON新建、10G PON与EPON/GPON共存两种组网模式下的用户带宽模型计算,得出10G PON网络在建设中的用户带宽和最佳用户数配置,以确定增加PON带宽或降低分光比达到千兆宽带接入网建设的最佳选择,为千兆宽带接入建设、快速部署10G PON网络提供参考.     

FTTH分光模式探讨

简要阐述采用PON(无源光网络)技术实现FTTH(光纤到户)的原理及网络架构,通过对FTTH技术及应用场景的介绍,结合FTTH设计中总结的一些经验,比较并探讨FTTH+PON中分光模式的特点,寻找一种适合我国用户分布特点及投资情况的典型分光模式,便于更好地为FTTH建设服务。     

OLT规划部署原则探析

本文对基于PON技术的OLT网络规划方案进行了介绍,结合某省级运营企业PON设备的实际情况和宽带网络建设状况,提出了PON网络建设思路与OLT规划部署原则。     

PON网络ODN设计浅析

随着近几年各大运营商加大对PON网络的投资力度,PON网络的商业运营已趋成熟。在PON网络中,由于网络设备组网更加简单,ODN实际上已经成为PON网络的主体,最高可占总体投资的70％,本文将对PON网络中ODN的覆盖范围、分光比、组网模式、传输衰耗等方面的设计进行探讨。     

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。     

一种PON故障综合分析定位系统

经过多年建设,全国已通过PON网络实现了3.2亿宽带用户的承载。高速稳定的PON网络背后是固网维护部门高强度的工作。由于宽带用户分散条件下网络覆盖范围大、资源部署环境复杂的特点,PON网络存在着故障量大和故障点排查定位困难的问题。本文提出一种基于现有网络管理及信息平台数据,以一种通过构建数据模型分析定位PON网络故障点的系统建设思路,实现网络维护经验的系统化提炼和在软件系统中的固化集成固化,降低故障修复时间,提升PON网络整体质量。     

聚焦场景的10G PON精准部署方案

当前千兆用户和千兆应用迅猛发展,各运营商都开始加快千兆光网建设,但在10G PON口升级过程中存在设备造价高及网络建设复杂性高两个难点,通过建立“GPON千兆承载能力测算模型”“千兆投资效益分析模型”和“千兆价值小区识别模型” 3个模型,模拟测算某移动网络演进时最佳的10G PON口部署场景,实现10G PON口精准部署,高效支撑千兆业务发展。3个模型适用于任何地区任意运营商,只需要输入对应PON现状数据及小区现状数据,即可模拟输出相应的10G PON部署场景。     

一种PON故障综合分析定位系统

经过多年建设,全国已通过PON网络实现了3.2亿宽带用户的承载。高速稳定的PON网络背后是固网维护部门高强度的工作。由于宽带用户分散条件下网络覆盖范围大、资源部署环境复杂的特点,PON网络存在着故障量大和故障点排查定位困难的问题。本文提出一种基于现有网络管理及信息平台数据,以一种通过构建数据模型分析定位PON网络故障点的系统建设思路,实现网络维护经验的系统化提炼和在软件系统中的固化集成固化,降低故障修复时间,提升PON网络整体质量。     

AWG-based device for a WDM overlay PON in the 1.5 μm band

A novel concept has been developed for overlaying a power-splitting passive optical network (PON) in one wavelength band with a wavelength-division-multiplexed (WDM) PON in another wavelength band. An eight-channel device fabricated in silica technique shows an insertion loss of 3.5 dB and a crosstalk of -23 dB for the WDM channels around 1.55 μm wavelength. The 1 to 8 splitting function at 1.50 μm wavelength has an additional penalty of -1 dB and a uniformity of ±0.5 dB     

FTTH建设背景下的PON网络建设策略研究

本文着重分析了FTTH建设背景下的PON网络建设策略,包括OLT下沉策略、分光器设置建设策略等,认为在条件允许的前提下,OLT、分光器建议结合业务分布情况下沉、靠近用户,分光比的选择可适当放大,以节省传输管线资源。     

有线宽带FTTH场景提速改造方案研究

一方面随着中国移动有线宽带用户发展迅猛,有线宽带端口占用率越来越高,单PON口下带的用户越来越多,难以满足多用户高带宽并发的需求;另一方面随着网络电视、4K、3D视频和游戏等新兴业务的发展,百兆甚至千兆用户需求越来越旺盛,而现有网络不能完全支撑高带宽的业务发展需求,带宽的提速升级迫在眉睫。本文针对中国移动业务旺盛和高价值站点的FTTH接入场景,分析扩容提速需求,提出降低分光比方案和升级10G PON方案,工程实施中应根据实际情况,采用适合的提速改造方案。     

First Commercial Deployment of a Colorless Gigabit WDM/TDM Hybrid PON System Using Remote Protocol Terminator

Colorless gigabit wavelength-division-multiplexing (WDM)/time-division-multiplexing (TDM) hybrid passive optical network (PON) using a remote protocol terminator is proposed and experimentally demonstrated. The system consists of reflective semiconductor optical amplifier-based WDM-PON and a legacy TDM-PON, combined with a simple and efficient remote node structure in order to provide high-speed fiber-to-the-home service to a large area with a high population density. The demonstrated system can support 512 subscribers with a single feeder fiber. The performance and feasibility of the system were evaluated by transmitting gigabit per second data including the effects of Rayleigh backscattering and 20 km attenuation. The system has been used by Korea Telecom to provide commercial services in Gwangju, Korea, since March 2009, after successfully passing through the benchmark test. This is the first commercial deployment of a WDM/TDM hybrid PON. It can accommodate field-deployed TDM-PON link without any modification and extend the maximum total reach of PON link by the use of remote protocol termination. Number of subscribers and the allocated bandwidth to the subscribers can be designed by simply changing the splitting ratio.      

32 digital uncompressed TV channel distribution via 8 HDWDMchannels

The performance of a demonstrator for the distribution of 32 digital uncompressed TV channels using HDWDM has been examined. For the transmission 8 optical wavelengths have been used spaced by 2 nm in the 1529-1543 nm range carrying a data rate of 8×622 Mbt/s. Without optical amplifier a splitting factor of 16 has been obtained for the PON with low crosstalk and polarization sensitivities. The demonstrator is the distributive part of a combined demonstrator including broad- and narrowband interactive services     

一种用于CATV/ISDN/VOD的新型光纤到户无源光网络

讨论了一种用于CATV／ISDN／NOD的新型光纤到户无源光网络(PON)，该网络使用了高能激光器、远程泵浦的掺饵光纤放大器(EDFA)、经济的下行接收机和上行半导体激光器，在CATV本地环路中可大幅度地减少设备费用。该网络采用了避免受激布里渊散射(SBS)技术和EDFA远程泵浦技术，从而提高了系统的可靠性和稳定性。     

PON网络弱光问题分析与防护

PON网络中的弱光问题随着FTTX业务发展(远距离、大分光比应用)变得越来越严重。通过对弱光产生原因的分析,梳理了影响光功率预算的主要因素。基于EPON扩展OAM/GPON OMCI协议,通过比较标准定义与实际应用,报告了ONU光功率的检测方法以及对应的弱光故障定位策略。结合工程应用总结了弱光问题防护与解决的几种方法。     

SUPER PON-a fiber to the home cable network for CATV andPOTS/ISDN/VOD as economical as a coaxial cable network

A complete super PON fiber to the home cable network as economical as the classic coaxial cable network, designed for application in the local loop is presented. The concept uses high power lasers, remote pumped erbium doped fiber amplifiers (EDFAs) to reduce cost by high splitting ratio, economical receivers for the downstream direction and economical CD player lasers for the upstream direction. Several novel technical solutions for this application (a new method to avoid stimulated Brillouin scattering (SBS), remote pumping of the EDFA and a compensating technique to adapt the CD laser to the normal fiber) are presented     

Radio-Frequency Self-Referencing Technique With Enhanced Sensitivity for Coarse WDM Fiber Optic Intensity Sensors

A self-referenced passive optical network (PON) with coarse wavelength division multiplexing (CWDM) is reported for remotely addressing optical intensity sensors with enhanced sensitivity. The self-referencing remote configuration is described as a finite-impulse-response (FIR) filter in reflective operation using two fiber Bragg gratings (FBG) and a fiber delay line. The antisymmetrical phase response of the configuration permits to achieve a self-referencing measurement parameter two times more sensitive than reported previously. To enhance the power budget of the network, CWDM devices with low insertion losses are used for spectral splitting of a radio-frequency (RF) modulated broadband light source (BLS). The network topology and the sensor's interrogation technique are theoretically analyzed and experimental results validating the models are reported.     

OLT PON端口内置OTDR技术分析

摘要：伴随着“宽带中国”战略的推进,FTTx大规模部署,同时光纤故障检测需求越来越多,需要一种以较低成本实现PON故障检测,提高运维效率的解决方案。因此,研究了OLT PON端口内置OTDR 技术,分析比较了不同波长方案的实现和成本,重点提出了基于PON 端口内置OTDR 的PON 系统架构,给出PON 端口内置OTDR 技术的测试性能要求以及限制其对设备、通信业务影响的要求,从而使PON端口内置OTDR 能够满足运营商的PON运营检测需求,提高运维效率。