毕业设计 有线电视网络 catv光纤网络设计.doc

HFC光链路常规设计 院 系： 传媒技术学院 专 业： 广播电视工程 2014年6月26日 课程设计任务书 学生姓名 学号 课程名称 《有线电视网络课程设计》 设计题目 楼陈区域 CATV光纤网络设计 设计目的、主要内容 摘 要 近年来，“天上卫星传送，地上有线覆盖”的星网结合模式，不仅是21世纪实现广播电视覆盖的最佳方式，也将成未来信息网络的基础构架。这样，立足于现有的有线电视HFC网络，融入现代通信技术、宽带网络技术和多媒体技术，我们便可以打破传统的行业界限，有效地实现“三网融合”，建立起一个宽带高速的公用信息网络体系。本次课程设计主要设计的是简单的光纤干路部分，通过光发射机发射光信号，经过光分光器分路后送到各个光节点。 关键词：HFC、光纤网络、光分路器、光节点 目 录 1 HFC光链路系统·······················································1 1.1 概述·······························································1 1.2 组成·······························································1 1.2.1 光纤·····························································1 1.2.2 同轴电缆·························································1 1.2.3用户分配网························································1 2 楼陈区域光纤网络设计·················································2 2.1 楼陈区域设计方案····················································2 2.2 设计原理及依据·····················································3 3 技术要求······························································6 4 系统指标分配与计算····················································7 4.1光纤损耗····························································7 4.2 分光比······························································7 4.3链路损耗····························································8 4.4 光发射机功率确定····················································8 5光发射机及光接收机的选型··············································9 5.1光发射机的选型······················································9 5.2光接收机的选型·····················································10 6 心得体会····························································12 7参考文献····························································131 HFC光链路系统 1.1 概述 HFC即混合光纤同轴电缆网，是指HybridFiber-Coaxial的缩写。是一种经济实用的综合数字服务宽带网接入技术。HFC通常有光纤干线、同轴电缆支线和用户配线网络三部分组成，从有线电视台出来的节目信号先变成光信号在干线上传输；到用户区域后把光信号转换成电信号，经分配器分配后通过同轴电缆送到用户。它与早期CATV同轴电缆网络的不同之处主要在于，在干线上用光纤传输光信号，在前段需完成电—光转换，进入用户区后要完成光