波(bo)分復用的技(ji)術(shu)原理(li)（四）

WDM本質上是(shi)光(guang)頻(pin)(pin)上的頻(pin)(pin)分(fen)(fen)復(fu)用FDM技術，每個(ge)(ge)波(bo)(bo)長(chang)(chang)通路(lu)通過頻(pin)(pin)域的分(fen)(fen)割(ge)實現。每個(ge)(ge)波(bo)(bo)長(chang)(chang)通路(lu)占用一段(duan)光(guang)纖的帶寬，與過去同(tong)(tong)軸電纜(lan)FDM技術不同(tong)(tong)的是(shi)：（1）傳輸(shu)媒質不同(tong)(tong)，WDM系統是(shi)光(guang)信(xin)號(hao)上的頻(pin)(pin)率分(fen)(fen)割(ge)，同(tong)(tong)軸系統是(shi)電信(xin)號(hao)上的頻(pin)(pin)率分(fen)(fen)割(ge)利用。（2）在每個(ge)(ge)通路(lu)上，同(tong)(tong)軸電纜(lan)系統傳輸(shu)的是(shi)模擬信(xin)號(hao)4KHz語音(yin)信(xin)號(hao)，而WDM系統目前每個(ge)(ge)波(bo)(bo)長(chang)(chang)通路(lu)上是(shi)數(shu)字(zi)(zi)信(xin)號(hao)SDH2.5Gb/s或(huo)更高速率的數(shu)字(zi)(zi)系統。粗波(bo)(bo)分(fen)(fen)

波分復用的技術原理（二(er)）

WDM技術(shu)就是為了充分(fen)(fen)(fen)利用(yong)(yong)單模光(guang)(guang)纖低(di)(di)損耗區帶來(lai)的(de)(de)巨大(da)帶寬資源，根(gen)(gen)據每一(yi)信(xin)道光(guang)(guang)波(bo)(bo)(bo)(bo)的(de)(de)頻率(lv)（或(huo)波(bo)(bo)(bo)(bo)長(chang)）不(bu)(bu)(bu)同(tong)(tong)(tong)(tong)可(ke)以將(jiang)光(guang)(guang)纖的(de)(de)低(di)(di)損耗窗(chuang)口劃分(fen)(fen)(fen)成若(ruo)干個信(xin)道，把光(guang)(guang)波(bo)(bo)(bo)(bo)作為信(xin)號的(de)(de)載(zai)(zai)波(bo)(bo)(bo)(bo)，在發送(song)(song)端(duan)采用(yong)(yong)波(bo)(bo)(bo)(bo)分(fen)(fen)(fen)復(fu)用(yong)(yong)器(qi)（合波(bo)(bo)(bo)(bo)器(qi)）將(jiang)不(bu)(bu)(bu)同(tong)(tong)(tong)(tong)規定(ding)波(bo)(bo)(bo)(bo)長(chang)的(de)(de)信(xin)號光(guang)(guang)載(zai)(zai)波(bo)(bo)(bo)(bo)合并起來(lai)送(song)(song)入(ru)一(yi)根(gen)(gen)光(guang)(guang)纖進行傳輸。在接收(shou)端(duan)，再由(you)一(yi)波(bo)(bo)(bo)(bo)分(fen)(fen)(fen)復(fu)用(yong)(yong)器(qi)（分(fen)(fen)(fen)波(bo)(bo)(bo)(bo)器(qi)）將(jiang)這些不(bu)(bu)(bu)同(tong)(tong)(tong)(tong)波(bo)(bo)(bo)(bo)長(chang)承載(zai)(zai)不(bu)(bu)(bu)同(tong)(tong)(tong)(tong)信(xin)號的(de)(de)光(guang)(guang)載(zai)(zai)波(bo)(bo)(bo)(bo)分(fen)(fen)(fen)開的(de)(de)復(fu)用(yong)(yong)方(fang)式。由(you)于(yu)不(bu)(bu)(bu)同(tong)(tong)(tong)(tong)波(bo)(bo)(bo)(bo)長(chang)的(de)(de)光(guang)(guang)載(zai)(zai)波(bo)(bo)(bo)(bo)信(xin)號可(ke)以看作互相(xiang)獨立（不(bu)(bu)(bu)考慮光(guang)(guang)纖非(fei)線性時），從而在一(yi)根(gen)(gen)光(guang)(guang)纖中可(ke)實(shi)現多路光(guang)(guang)信(xin)號的(de)(de)復(fu)用(yong)(yong)傳輸。將(jiang)兩個方(fang)向的(de)(de)信(xin)號分(fen)(fen)(fen)別安排(pai)在不(bu)(bu)(bu)同(tong)(tong)(tong)(tong)波(bo)(bo)(bo)(bo)長(chang)傳輸即可(ke)實(shi)現雙向傳輸。根(gen)(gen)據波(bo)(bo)(bo)(bo)分(fen)(fen)(fen)復(fu)用(yong)(yong)器(qi)的(de)(de)不(bu)(bu)(bu)同(tong)(tong)(tong)(tong)，粗(cu)波(bo)(bo)(bo)(bo)分(fen)(fen)(fen)廠(chang)家，可(ke)以復(fu)用(yong)(yong)的(de)(de)波(bo)(bo)(bo)(bo)長(chang)數也不(bu)(bu)(bu)同(tong)(tong)(tong)(tong)，粗(cu)波(bo)(bo)(bo)(bo)分(fen)(fen)(fen)優勢，從2個至(zhi)幾十個不(bu)(bu)(bu)等，一(yi)般商用(yong)(yong)化是8波(bo)(bo)(bo)(bo)長(chang)和16波(bo)(bo)(bo)(bo)長(chang)系統，這取(qu)決于(yu)所允許的(de)(de)光(guang)(guang)載(zai)(zai)波(bo)(bo)(bo)(bo)波(bo)(bo)(bo)(bo)長(chang)的(de)(de)間隔大(da)小(xiao)。粗(cu)波(bo)(bo)(bo)(bo)分(fen)(fen)(fen)

粗波分復用的作用

隨著Internet的IP數據業(ye)務高速(su)增長(chang)，造(zao)成對傳輸(shu)線路帶寬(kuan)需求(qiu)不(bu)斷加(jia)大。雖然DWDM（密集(ji)波(bo)分復(fu)用(yong)）技(ji)術作為(wei)***6的解(jie)(jie)決線路帶寬(kuan)擴容的方法(fa)，但是CWDM (粗(cu)波(bo)分復(fu)用(yong)) 技(ji)術比(bi)DWDM在系(xi)統成本、通(tong)(tong)用(yong)性及可維護性等方面具有(you)優勢。匯信(xin)特通(tong)(tong)信(xin)技(ji)術有(you)限公(gong)司結(jie)合市場需求(qiu)，開發(fa)出(chu)運用(yong)于G.652、G.653、G.655光(guang)纖的CWDM設備(bei)，是日益增長(chang)的城域網(wang)組網(wang)的理想選擇(ze)，粗(cu)波(bo)分，并(bing)考慮(lv)將來(lai)設備(bei)擴容，粗(cu)波(bo)分提供商，C&D混合波(bo)分設備(bei)具有(you)很強的波(bo)道升級能力(li)，是通(tong)(tong)信(xin)運營商網(wang)絡(luo)(luo)優化，大客戶網(wang)絡(luo)(luo)改造(zao)，接入層寬(kuan)帶業(ye)務發(fa)展解(jie)(jie)決纖芯緊張的良好選擇(ze)。粗(cu)波(bo)分