聲明........................................................................................................................................... i
波分復(fù)用技術(shù)概述......................................................................................................................1
1 波分復(fù)用光傳輸技術(shù)................................................................................................................ 1
1.1 波分復(fù)用的基本概念..................................................................................................... 1
1.2 WDM 技術(shù)的發(fā)展背景................................................................................................... 2
2 DWDM 原理概述...................................................................................................................... 3
3 WDM 設(shè)備的傳輸方式.............................................................................................................. 5
3.1 單向WDM ........................................................................................................................ 5
3.2 雙向WDM ........................................................................................................................ 5
4 開放式與集成式系統(tǒng)................................................................................................................ 6
5 WDM 系統(tǒng)組成......................................................................................................................... 6
6 WDM 的優(yōu)勢............................................................................................................................ 7
7 CWDM 簡介............................................................................................................................. 8
思考題........................................................................................................................................ 9
WDM 傳輸媒質(zhì)........................................................................................................................ 10
1 光纖的結(jié)構(gòu)............................................................................................................................ 10
2 光纖的種類............................................................................................................................ 11
3 光纖的基本特性..................................................................................................................... 12
3.1 幾何尺寸（模場直徑） ............................................................................................... 12
3.2 衰減常數(shù)..................................................................................................................... 12
3.3 色散系數(shù)..................................................................................................................... 13
思考題...................................................................................................................................... 13
DWDM 關(guān)鍵技術(shù)...................................................................................................................... 15
1 光源...................................................................................................................................... 15
1.1 激光器的調(diào)制方式....................................................................................................... 16
1.2 激光器的波長的穩(wěn)定................................................................................................... 18
2 光電檢測器............................................................................................................................ 20
2.2 PIN 光電二極管........................................................................................................... 20
2.3 雪崩光電二極管（APD）............................................................................................ 20
3 光放大器............................................................................................................................... 21
3.1 光放大器概述.............................................................................................................. 21
3.2 摻鉺光纖（EDF）....................................................................................................... 22
3.3 EDFA 增益平坦控制.................................................................................................... 23
華為產(chǎn)品維護(hù)資料
WDM 原理 2004/10/15
iii
3.4 EDFA 的增益鎖定........................................................................................................ 24
3.5 摻鉺光纖放大器的優(yōu)缺點(diǎn)............................................................................................ 25
3.6 拉曼光纖放大器.......................................................................................................... 26
3.7 有關(guān)光放大器的技術(shù)指標(biāo)............................................................................................ 27
4 光復(fù)用器和光解復(fù)用器.......................................................................................................... 28
4.2 光柵型波分復(fù)用器....................................................................................................... 28
4.3 介質(zhì)薄膜型波分復(fù)用器............................................................................................... 30
4.4 熔錐型波分復(fù)用器....................................................................................................... 31
4.5 集成光波導(dǎo)型波分復(fù)用器............................................................................................ 31
4.6 波分復(fù)用器件性能比較............................................................................................... 32
4.7 對光復(fù)用器件的基本要求............................................................................................ 32
5 光監(jiān)控信道............................................................................................................................ 33
5.1 光監(jiān)控通路要求.......................................................................................................... 34
5.2 監(jiān)控通路接口參數(shù)....................................................................................................... 35
5.3 監(jiān)控通路的幀結(jié)構(gòu)....................................................................................................... 35
思考題...................................................................................................................................... 36
DWDM 光傳輸系統(tǒng)的技術(shù)規(guī)范................................................................................................ 37
1 ITU-T 有關(guān)WDM 系統(tǒng)的建議................................................................................................. 37
2 傳輸通道參考點(diǎn)的定義.......................................................................................................... 37
3 光波長區(qū)的分配..................................................................................................................... 38
思考題...................................................................................................................................... 41
專用詞匯及縮略語.................................................................................................................... 42