【正文】 某小區(qū)光纖有線電視網(wǎng)絡(luò)的設(shè)計(jì) 摘要 有線電視在目前住宅建設(shè)中是必備的， 隨著廣播電視的飛速發(fā)展，以及信息化的發(fā)展要求，光纖有線電視的高速應(yīng)用和普及，成為整個(gè)有線電視和通訊網(wǎng)絡(luò)的瓶頸，因此迫切需要找到一種有利于業(yè)務(wù)綜合發(fā)展方式。 光纖有線電視網(wǎng)絡(luò)技術(shù)的發(fā)展，是網(wǎng)絡(luò)向綜合化、多功能、數(shù)字化發(fā)展的必要要求。即通過(guò)對(duì)光纖 CATV 網(wǎng)絡(luò)的改造，可以使其升級(jí)為光纖 /同軸電纜混合（ HFC）系統(tǒng)，或者將 HFC 與光纖數(shù)字技術(shù)相結(jié)合構(gòu)成交互式數(shù)字視頻（ SDV）系統(tǒng)，實(shí)現(xiàn)在同一網(wǎng)絡(luò)中傳送有線電視、電話綜合業(yè)務(wù)。 應(yīng)用光纖傳輸有線 電視信號(hào)，采用分布式 HFC 的網(wǎng)絡(luò)結(jié)構(gòu)，增加了小區(qū)有線電視網(wǎng)絡(luò)的功能，使有線電視網(wǎng)絡(luò)能夠?yàn)槿藗兲峁┢诖壕玫男聵I(yè)務(wù)。同時(shí)也為當(dāng)?shù)匕l(fā)展綜合業(yè)務(wù)數(shù)字電視奠定了良好的基礎(chǔ)。 關(guān)鍵詞 :有線電視光纖；傳輸圖像質(zhì)量； HFC 網(wǎng)絡(luò)； Abstract Cable TV in the current housing construction is necessary, along with the rapid development of radio and television, as well as requirements for the development of information technology, highspeed fiber optic cable usage and peration, as the entire cable and munications work bottlenecks, there is an urgent need It conducive to business to find a prehensive approach to development. Optical fiber cable work technology development is integrated to the work, multifunction, digital development of the necessary requirements. That is, through the transformation of optical CATV work, it can upgrade to a fiber / coaxial cable mixed (HFC) system, or HFC and optical digital interactive technology of bining a digital video (SDV) system, to achieve the same Cable television work transmission, telephone integrated services. Applications transmitting cable television signals, distributed by the HFC work structure, an increase of the functions of district cable television works, cable television works to provide people with long been looking forward to the new business. But also for the local development of an integrated service digital TV laid a good foundation. Key words: optical fiber cable。 transmission image quality。 HFC work。 目錄 某小區(qū)光纖有線電視網(wǎng)絡(luò)的設(shè)計(jì) ....................................................................................... 1 摘要 ................................................................................................................................. 1 Abstract ............................................................................................................................ 2 引言 ................................................................................................................................. 5 第一章 概述 ............................................................................................................... 6 國(guó)內(nèi)外有線電視網(wǎng)絡(luò)現(xiàn)狀 ............................................................................................ 6 國(guó)外發(fā)達(dá)國(guó)家的有線電視現(xiàn)狀及技術(shù)水平 ................................................... 6 國(guó)內(nèi)有線電視發(fā)展現(xiàn)狀及技術(shù)水平 ............................................................. 9 課題研究的目的和意義 ...................................................................................... 10 1． 3 課題的主要研究?jī)?nèi)容及解決的技術(shù)關(guān)鍵 ........................................................... 11 第二章 光纖傳輸有線電視信號(hào)的原理 ....................................................................... 12 有線電視的優(yōu)點(diǎn) ................................................................................................. 12 可以增加頻道，提供給用戶更多的電視節(jié)目 ............................................. 12 抗干擾能力強(qiáng) ........................................................................................... 12 提高電視的覆蓋率 .................................................................................... 12 美化市容 .................................................................................................. 13 有線電視系統(tǒng)的頻率設(shè)置 ................................................................................... 13 波段劃分 .................................................................................................. 13 模擬電視頻道劃分 .................................................................................... 13 有線電視系統(tǒng)組成 ............................................................................................. 14 信號(hào)源 ..................................................................................................... 14 ......................................................................................................... 14 傳輸 ......................................................................................................... 14 用戶分配系統(tǒng) ........................................................................................... 14 網(wǎng)設(shè)備組成 ....................................................................................... 15 2． 4HFC網(wǎng)絡(luò)主要部分組成 : .................................................................................... 15 2． 5HFC網(wǎng)優(yōu)勢(shì) :...................................................................................................... 16 2． 6HFC寬帶接入設(shè)計(jì)方法 ..................................................................................... 17 有線電視技術(shù)指標(biāo)介紹 ...................................................................................... 18 載噪比 (C/N) ............................................................................................. 18 載波復(fù)合二次差拍比和載波三次差拍比 .................................................... 21 光纖傳輸鏈路 .................................................................................................... 25 光纖傳輸基本原理 .................................................................................... 25 利用纖傳輸電視節(jié)目的優(yōu)點(diǎn) ...................................................................... 26 光傳輸設(shè)備 .............................................................................................. 27 光調(diào)制的基本方式 ............................................................................................. 27 1550nm 模擬光纖傳輸技術(shù) .................................................. 29 應(yīng)用摻餌光纖放大器 (EDFA) ............................................................................. 30 光信號(hào)的傳輸 ................................................................................................... 30 光纖傳輸特性： ..................................................................................... 30 光纖的傳輸原理 ......................................