cong nghe mang wdm

7/30/2019 Cong Nghe Mang WDM

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Cng ngh DWDM(Dense Wavelength Division Multiplex 1 Nm, 2 Thng Trc Cng ngh WDM

-WDM l phng thc ghp knh quang theo bc sng. -Thng thng trong tuyn thng tin quang im ni im, mi mt si dn quang cho mt tia laser vi mt bcsng nh sng truyn qua, ti u thu, b tch sng quang tng ng s nhn tn hiu t si ny. -Mi mt sng laser ny mang mt s tn hiu in vi mt ph nht nh. -WDM cho php ta tng dung lng knh m khng cn tng tc bit ca ng truyn v cng khng dng thm

si dn quang. So snh WDM v TDM

Cng ngh DWDM


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-DWDM (Dense- Wave Division Multiplexing) : L mt k thut sp xp d liu vo cng vi nhau t nhiu ngunkhc nhau trn mt cp si quang vi mi tn hiu c truyn ti cng thi im trn bc sng nh sng ringbit. -Khi s dng DWDM, c n 160 (v l thuyt c th nhiu hn) bc sng khc nhau hay knh d liu c th cdn vo mt dng nh sng c truyn trn mt cp si quang.

-Mi knh mang mt tn hiu TDM. -DWDM ha hn gii quyt vn "fiber exhaust" (cn kit ngun sng) v l cng ngh trong tt c cc mng cpquang trong tng lai.

Cc thnh phn h thng DWDM DWDM l cng ngh li trong mt mng truyn dn quang. Cc thnh phn cn thit ca DWDM: -Bn truyn: Laser pht bc sng n nh v chnh xc. -Trn ng truyn: Si quang c suy hao thp, suy hao u theo cc bc sng. -Bn nhn: B thu v b tch knh quang. -Cc b xen rt knh (OADM), cc kt ni cho quang, cc b khuch i quang...B pht (Laser)(ITU Wavelength Grid)

S bc sng v khong cch da cc bc sng c th thay i tu theo thit k. Ca s quang dng trong DWDM


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-Trong cng nghip vin thng dng 2 ca s quang: 1310nm & 1550nm. -Ca s 1550nm c chn trong truyn dn trc v DWDM v c suy hao nh v ca s quang ln hn. B thu quang Hai loi b thu c s dng rng ri : -Positive-intrinsic-negative photodiode (PIN)-Avalanche photodiode (APD).Si quang C 2 loi si quang: -Si n mode -Si a mode Cc yu t quyt nh cht lng si quang: -Suy hao-Tn sc -Tn sc mode (ch c si a mode) -Tn sc mu (chromatic) -Tn sc phn cc B khuych i quang


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S dng b khuych i quang EDFA (Erbium Doped Fiber Amplifier_ B khuch i quang c kch thch bngEri)

-Trnh bin i quang in. -Khuych i tt c cc bc sng trong ca s 1550nm mt cch ng thi. -Ch c phn Bm Laser (Pump Laser) l phn cung cp nng lng. B xen/rt knh quang

C 2 loi OADM: . -Thit b nh trc bc sng thm hay rt. -Thit b c th cu hnh bc sng thm hay rt. Cc giao tip trong mng DWDM Hu ht cc DWDM h tr cc chun giao tip SONET/SDH Cc giao din h tr mng MAN v mng truy cp: Ethernet, ESCON, Fibre Channel Cc client site c kt cui SONET/SDH mun kt ni vo mng DWDM phi thng qua b Transponder


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Cc giao tip h thng DWDM

DWDM MAN Metro DWDM ch yu thit lp trong cc thnh ph, th nn khong cc thng nh hn 100km. Do thngkhng s dng b khuch i quang.

Cc m hnh mng DWDM MAN


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-M hnh Point to Point-M hnh Ring-M hnh MeshCu hnh bo v

Th h th nht -Cung cp kh nng bo v c bn -Thit b cung cp d tha mc h thng -Cc tuyn link d tha kt ni n h thng.

Th h th hai -Cung cp kh nng bo v c bn -Thit b cung cp d tha mc card -Cc tuyn link d tha kt ni n mt h thng m cha ng d tha v transponder, multiplexers, v CPU


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Th h sau (NG) -Kh nng bo v c iu khin bi cc kt ni cho quang.-Mc bo v t mc si sang mc bc sng. -C kh nng khi phc mng im im, Ring hay Mesh. M hnh mng quang MAN th h sau

u im ca mng MAN


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Xu hng pht trin trong mng truyn ti quang - Vit nam ang u?

1- Xu h ng pht tri n trong m ng truy n t i quang Hin nay, "cu c cch m ng quang" ang bt u c quan tm trong t ng truy n t i ca m ngvin thng. Xu hng pht tri n c a m ng truy n t i quang trong tng lai c t ng k t tronghnh sau (ch t ng k t theo xu h ng nghin c u- cn ng d ng th c t th c n th i gian nhgi) :

(source: T p ch CNTT&TT K 1 thng 11/2008)

Mc d vi c x l tn hi u quang cng nh cng ngh ch to quang v n cn nhi u h n ch vcn ang c ti p t c nghin c u v pht tri n, i vi cng ngh chuy n m ch trong mi nquang, c th d dng nh n ra r ng nh ng g din ra trong s ti n ha c a m ng trong mi nx l in c th c hi n ho c ang c ch i i vi s pht tri n c a cc m ng quang.

Mi n i n ------------------ Mi n quang CM knh ~~~~~~~~~~~~ CM tuy n quang (cn g i l chuy n m ch bc sng)CM bn tin/tin bo ~~~~~~~ CM Burst quang (CM chm/ b quang- ti th thch gi nguynch ti ng Anh)CM gi ~~~~~~~~~~~~~ CM gi quang

Tuy nhin, hi khc v i trong mi n in, chuy n m ch b n tin/tin bo (message switching) s mb lng qun v h u nh khng c ng d ng thng mi, CM burst quang v n c quan tm vang c k vng l bc chuy n ti p t cm knh quang (tuy n quang) ln cm gi quang.
http://www.thegioimang.vn/http://www.thegioimang.vn/http://www.thegioimang.vn/


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(Khng bi t l trong tng lai, cm burst quang c th khng nh c mnh khng hay s ch uchung s ph n nh "ngi anh em" trong mi n in )

V cng ngh truy n d n, c h tr bi s pht tri n cng ngh thi t b quang, h cng ngh xWDM ang ngy cng th hin c vai tr ch o khng ch trong cc m ng ng tr c mcn trong m ng truy nh p (Metro Networks v LANs).Hin nay trn th gii, v i s xu t hi n ngy cng nhi u c a cc s n ph m chuy n m ch tuy nquang (Optical Path Switching) (ROADM, OXC) trong thng mi, cc m ng ng tr c quangang dn d n chuy n mnh t cc m ng Point-to-Point ho c Ring sang m ng ki u li (Mesh) vy cc c u hnh n gin Ring v Point-to-point v pha m ng truy c p. Hai trong s cc cngngh h tr cc m ng chuy n m ch quang s dng cc chuy n m ch tuy n quang angc ITU-T quan tm v chu n ha l OTN (Optical Transport Networks- G.709, G.872,...) vNG-SONET/SDH (Next Generation SONET/SDH).

2- Vi t nam ang u? Coming soon...
http://tudiencongnghe.net/Special:Search/ITU-Thttp://tudiencongnghe.net/Special:Search/ITU-Thttp://tudiencongnghe.net/Special:Search/ITU-Thttp://tudiencongnghe.net/Special:Search/ITU-T

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