BÁO CÁO CUỐI CÙNG HỆ THỐNG VIỄN THÔNG

8/13/2019 BO CO CUI CNG H THNG VIN THNG

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Bmn Hthng vin thng PGS.TS V Vn Ym

Thit km phng hthng thng tin quang ghp knh theo bc sng mt cao Page 1

MC LCPHN I. GII THIU TI .................................................................................................................. 2

1.1 Tn ti ...................................................................................................................................... 2

1.2 Gii thiu chung. ........................................................................................................................... 2

PHN II : L THUYT ............................................................................................................................ 3

2.1 Hthng thng tin quang ghp theo bc sng .......................................................................... 3

2.1.1 Gii thiu. ............................................................................................................................... 3

2.1.2 S chung ca hthng thng tin quang . ........................................................................ 3

2.2 Hthng ghp knh quang theo bc sng mt cao DWDM................................................. 6

2.2.1 Gii thiu. ............................................................................................................................... 6

2.2.2. Thnh phn mng DWDM .................................................................................................... 8

2.2.3 Chc nng hthng .............................................................................................................. 9

2.2.4 Cc thng snh hng n hthng DWDM .................................................................. 10

2.2.5 Cc kiu mng DWDM ......................................................................................................... 10

2.2.6 ng dng DWDM ti cc lp mng .................................................................................... 12

PHN III. PHN MM OPTISYSTEM .................................................................................................. 13

3.1. Tng quan vphn mm Optisystem ........................................................................................ 13

3.1.1. Li ch ................................................................................................................................. 13

3.1.2. ng dng ............................................................................................................................ 13

3.2. c im v chc nng............................................................................................................. 143.2.1. Cu to th vin (Component Library) ............................................................................... 14

3.2.2. Tch hp vi cc cng cphn mm Optiwave ................................................................. 15

3.2.3. Cc cng chin th............................................................................................................ 15

3.2.4. M phng phn cp vi cc hthng con (subsystem) ..................................................... 16

3.2.5. Thit knhiu lp(Multiple Layout) .................................................................................... 16

3.2.6. Trang bo co (report page) ............................................................................................... 16

3.2.7 Qut tham sv ti u ha (parameter sweeps and optimizations)................................... 17

3.3 Mt sgiao din phn mm ....................................................................................................... 17PHN IV. M PHNG THIT KHTHNG THNG TIN QUANG GHP KNH ........................... 21

4.1 Yu cu thit k.......................................................................................................................... 21

4.2.M phng theo phng n thit k............................................................................................. 22

4.2.1.Tuyn pht quang: chn ca struyn 1550nm EDFA bng C...................................... 22

4.2.2 Tuyn truyn dn quang ...................................................................................................... 25

4.2.3 Tuyn thu ca hthng DWDM ........................................................................................... 27

4.3.Kt qum phng theo yu cu ................................................................................................. 28

PHN V: KT LUN ............................................................................................................................. 32


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PHN I. GII THIU TI

1.1 Tn ti

ti:M phng thit khthng thng tin quang ghp knh theo bc sngmt cao.Sdng tool cng cOptisystem ca gi phn mm OptiwareSoftware.

1.2 Gii thiu chung.

Ngy nay,hthng tin si quang v ang c sdng rng ri trong thngtin lin lc. Bi ly l hthng p ng c yu cu sdng bng thngcng nh qucng sut thu pht v cly thng tin tt nht hin nay. So vithng tin dng cp ng (ADSL) th tc ti a t c ca hthng thngtin si quang(FTTH) gp 50 ln. Khng nhng th hthng thng tin cp siquang cn c bo mt rt cao do tnh ng kn hthng truyn dn v sdng tn hiu nh sng thay cho tn hiu in. Do vy nhm chng em chnti bi tp ln mn Hthng vin thng vi mc ch nghin cu v tm hiuvhthng thng tin cp si quang.

Trong qu trnh lm Bi tp ln chng em vn dng c rt nhiu kin thc hc c trn lp v cng l mc tiu ca nhm chng em ra.

Cui cng, Chng em xin chn thnh cm n thy V Vn Ym tn tnhhng dn chng em trong sut qu trnh Nhm chng em hon thnh ckt qunh mong i.


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PHN II : L THUYT

2.1 Hthng thng tin quang ghp theo bc sng

2.1.1 Gii thiu.

Thk21 l thkca cng nghthng tin truyn thng. Sbng nca ccloi hnh dch vthng tin, c bit l spht trin nhanh chng ca mnginternet lm gia tng khng ngng nhu cu vdung lng cao. Cng nghghpknh theo bc sng quang (WDM) l mt gii php hon ho cho php tndng hu hiu bng thng rng ln ca si quang, nng cao r rt dung lngtruyn dn ng thi hgi thnh sn phm. Spht trin ca hthng WDM

cng vi cng nghchuyn mch quang sto nn mt mang thng tin thhmi, l mnh thng tin quang trong sut .

2.1.2 S chung ca hthng thng tin quang .

Ghp knh quang theo bc sng WDM (Wavelength Devision Multiplexing)l cng nghtrong mt si quang truyn dn nhiu bc sng tn hiu quang.u pht, nhiu tn hiu quang c bc sng khc nhau c thp li(ghep

knh) truyn i trn mt si quang. u thu tn hiu thp c phngii ra(tch knh), khi phc cc tn hiu gc ri a vo u cui khc nhau .

Gm 3 phn:+) Bpht quang.+) Mi trng truyn dn: Si quang.+)Bthu quang.


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2.1.2.1 Bpht quang .

Nh vy cu trc c bn ca bpht quang bao gm:

+) Ngun quang.+) Bghp tn hiu quang.+) Mch iu chtn hiu.+) Mch iu khin.

2.1.2.2 Mi trng truyn dn .Mi trng truyn dn l si quang c suy hao thp, sao hao u theo cc

bc sng.


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-Phn loi si quang+) Theo chit sut:- Si quang chit sut bc SI(Step-Index)- Si quang chit sut bin i GI (Graded-Index)

+) Theo smode- Si n mode (Single-Mode)- Si a mode (Multi-Mode)

2.1.2.3 Bthu quang.

Bthu quang gm cc phn :

+) Btch sng quang .+) Btin khuch i in .


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+) Cc phn txl tn hiu in .c im:

u im ca cng nghWDM:-Tng bng thng truyn trn si quang sln tng ng sbc sng c

ghp vo truyn trn mt si quang .-Tnh trong sut: do cng nghWDM thuc kin trc lp mng vt l nn n c

thhtrcc nh dng sliu v thoi nh : ATM, Gigabit Ethernet, ESCON,chuyn mch knh, IP

-Khnng mrng : Nhng tin btrong cng nghWDM ha hn tng bngthng trn si quang ln n hang Tbps, p ng nhu cu mrng mng nhiucp khc nhau .

-Hin ti chc duy nht cng nghWDM l cho php xy dng m hnh mngtruyn ti quang OTN(Optical Transport Network) gip truyn ti trong sutnhiu li hnh dch v, qun l mng hiu qu, nh tuyn linh ng.

Nhc im ca cng nghWDM :-Vn cha khai thc ht bng tn hot ng c thca si quang ( chmi tn

dng c bang C v bng L) .-Qu trnh khai thc, bo dng phc tp hn nhiu ln .-Nu hthng si quang l si DSF theo chun G.653 th rt kh trin khai

WDM v xut hin hin tng trn bn bc sng kh kh khn .

2.2 Hthng ghp knh quang theo bc sng mt cao DWDM

2.2.1 Gii thiu.DWBM (Dense Wavelength Division Multiplex) - Cng nghghp knh theo

bc sng mt cao, l mt trong nhng cng nghquan trng nht trong spht trin cng nghtruyn hnh tn hiu quang. DWDM thc hin ghp knhtheo bc sng vi mt rt cao, c khi ln ti hng nghn knh, cung cpdung lng rt ln phc vtruyn dliu, ti phim nh, m nhc, tr chi ngycng pht trin. DWDM hin nay thng dng cho mng back bone nh hthng cp quang bin ngy nay hay hthng xuyn lc a, cng c thcungcp trong phm vi mt nc hay khu vc do chi ph trin khai rt cao, khongcch khng dng blp hay khuch i ln ti vi nghn km.


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u im:-Tc truyn cao, c thln n 400Gb/s, suy hao thp, khong cch truyn

xa.

-a giao thc: giao thc DWDM khng phthuc vo tc truyn dliu, vthcc giao thc IP, ATM, SONET/SDH c thtruyn vi tc t100Mbpsn 2,5Gbps.

-DWDM c thtruyn nhiu dng tn hiu khc nhau trn cng mt knh.Nhc im:-Gi thnh t, chi ph lp t trin khai t hn so vi mng c WDM.Spht trin cng nghDWDM.

u nhng nm 1990, thi kca hthng WDM thh2 chuyn tsdng2 knh ln 8 knh, nhn knh ny t cch nhau mt khong 400GHz min1550nm. Gia nhng nm 1990, hthng DWDM ni ln mnh mvi sdng16-40 knh v khong cch tn s100-200GHz. Cui nhng nm 1990 hthng DWDM pht trin ln mc 64-100 knh song song, mt ng giln n khong cch tn s50 hay thm ch 25GHz .

Stng cng mt knh do ng dng cng nghDWDM nh hngmnh mln dung lng mang tn hiu ca si quang. Nm 1995, khi nhng h

thng 10Gbps u tin c trin khai, tc tng dung lng t4 ln minm .


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2.2.2. Thnh phn mng DWDM

2.2.2.1 Bghp knh u cui DWDMBghp knh cha cc btransponder(btch sng) chuyn ibc sng

cho tng bc sng mang tn hiu. Cc transponder ny nhn tn hiu quangu vo, chuyn chng thnh cc tn hiu in v truyn li bng laser di

bng 1550nm. Cc bghp knh u cui ny cn c cbghp knh tn hiuquang, chng sghp cc tn hiu trong bng 1550nm vo mt si cp (SMF-28fiber). Bghp knh u cui c thhoc khng htrbkhuch i quangEDFA ni bi vi tn hiu quang a bc sng .

2.2.2.2 Cc blp quang tc thiMi khong 80-100km li t mt bgim suy hao cng sut quang khi

truyn trn ng dy. Tn hiu sc khuch i bi EDFA .

2.2.2.3 u cui quang tc thi (bADM)L phn a im bkhuch i txa m khuch i cc tn hiu a bc

sng truyn ln n 140km hoc hn thtrc khi ti trm remote sites.Phn tch v o c tn hiu quang c thc hin ti cc site, cho php nhvbt cst gy hoc suy gim tn hiu no. Trong cc hthng phc tpcc tn hiu vt ra ngoi tn hiu a bc sng c thc loi btng phn.

2.2.2.4 Thit bu cui phn knh DWDMChuyn tn hiu a bc sng trvtng tn hiu n nh trc o, a tr

vcc si khc nhau trong hthng client-layer(nh SONET/SDH). C bnphn phn knh ny c thc hin hon ton thng trmt vi php o,hu ht cc hthng SONET u nhn cc tn hiu bc sng SONET u nhncc tn hiu bc sng 1550nm. Tuy nhin chuyn n hthng client-layer,m bo tnh ton vn tn hiu scc tn hiu phn knh ny thng thng sc gi sng cc transponder u ra O/E/O trc khi chuyn n hthngclient-layer.


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2.2.2.5 Knh gim st quang optical supervisory channel(OSC)Truyn cc thng tin vtn hiu quang a bc sng cng nh iu kin

remote ti cc im u cui .

2.2.2.6. Giao din DWDMPhn ln cc hthng DWDM htrchun giao tip vi SONET/SDH. Bn

trong hthng DWDM, transponder chuyn tn hiu quang ca client ttn hiuin gi tr. Nhng tn hiu ny c sdng cho u vo laser. Mitransponder trong hthng schuyn tn hiu ca client ca n thnh mt bcsng khc nhau. Cc bc sng khc nhau ca tt ccc client qua transpondersc ghp knh quang li. V bn pha u thu ca hthng DWDM sdin ra qu trnh ngc li. Cc bc sng n lsc tch ra tbtch

sng, chuyn n tng transponder tng ng, m ti tn hiu scchuyn li thnh tn hiu in v giao din chun trvcho client.

2.2.3 Chc nng hthng

Hthng gm cc chc nng chnh sau :

2.2.3.1 To tn hiu

Ngun tn hiu laser pht sng n nh, bng hp mang tn hiu sc iu

chdng tn hiu tng t.

2.2.3.2 Ghp knh tn hiuHthng DWDM trin khai ghp knh tng hp tn hiu. C nhiu xy ra

cc qu trnh tch v ghp knh, nhiu ny phthuc vo sknh c truyn

nhng c thc ti thiu bng cc blc quang- sci thin tt ccc tn

hiu quang m khng cn chuyn sang tn hiu in .

2.2.3.3 Truyn tn hiuDi tc ng nhiu xuyn v suy hao tn hiu quang gy sauy hao, tn tht

do truyn tn hiu trong si quang. Gim cc suy hao ny bng iu khin cc

thng snh khong cch tn s, dung sai bc sng, cng sut pht laser. Cc

tn hiu quang cn c khuch i tng khong cch truyn cng nh gim

nhiu .


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2.2.3.4 Phn knh tn hiuTn hiu c phn knh c nhn bi thit bthu quang nh photodetector,

thm na mt hthng DWDM cn c trang bgiao din pha ngi dng

nhn tn hiu pha u vo, chc nng ny c thc hin bi cc transponder.Vmt DWDM sl cc giao din quang lin kt vi hthng DWDM .

2.2.4 Cc thng snh hng n hthng DWDMSuy hao.Sknh bc sng.rng phca ngun pht.Qucng sut.

Tn sc.Hiu ng phi tuyn.Di bc sng lm vic ca hthng.

2.2.5 Cc kiu mng DWDM-DWDM c hai kiu ng dng: kiu mng mv mng tch hp.

Kiu mng DWDM mhot ng vi mi loi giao din quang u cui. Hthng

ny sdng cng nghchuyn i bc sng chuyn i tn hiu quang tbc

sng ca lung tn hiu cn truyn sang bc sng quy chun trong hthng. Cctn

hiu quang tcc thit bu cui khc nhau sau khi c chuyn i thnh cc

bc sng khc nhau ph hp hthng theo khuyn nghITU-T c a ti b

ghp ghp thnh tn hiu DWDM.


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Hnh 1. Hthng DWDM m

-Hthng DWDM tch hp khng sdng cng nghchuyn i bc sng. H

thng DWDM tch hp c thit khot ng cng vi mt smng khcnh

SDH, Ethernet, ... Cc giao din quang tthit bthuc cc mng c tch hpphi

c bc sng chun ha DWDM v c kt ni trc tip vo btch ghp knhca

hthng DWDM.

Hnh 2. Hthng DWDM tch hp


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2.2.6 ng dng DWDM ti cc lp mng

- Mng ng trc (back-bone)

Cc hthng DWDM khong cch xa (long-haul) c ng dng trong mng

ng trc truyn ti thng tin vi lu lng ln gia cc vng trong mt

quc gia. c im ca cc hthng ny l dung lng rt ln v sdng cc

cng nghsa li FEC, khuych i Raman, nh dng xung CRZ cng vi cc

trm lp tng cng vkhong cch. Hthng mng ng trc c xy

dng di dng hnh vng hoc hnh li tng khnng bo vlu lng.

- Mng ni vng (Metropolitan)

Sdng cc hthng DWDM khong cch trung bnh kt ni gia cc

im tp trung lu lng trong mt vng. Cc mng metro cng c xy dng

dng hnh vng hoc hnh li tng khnng bo vlu lng.


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PHN III. PHN MM OPTISYSTEM

3.1. Tng quan vphn mm Optisystem

Cng vi sbng nvnhu cu thng tin, cc hthng thng tin quangngy cng trnn phc tp. phn tich, thit kcc hthng ny bt buc

phi sdng cc cng cm phng. OptiSystem l phn mm m phng hthng thng tin quang. Phn mm ny c khnng thit k, o kim tra v thchin ti u ha rt nhiu loi tuyn thng tin quang, da trn khnng m hnhha cc hthng thng tin quang trong thc t. Bn cnh , phn mm nycng c thddng mrng do ngi sdng c tha thm cc phn ttnh ngha vo. Phn mm c giao din thn thin, khnng hin thtrc quan.OptiSystem c thgim thiu cc yu cu thi gian v gim chi ph lin quann thit kca cc hthng quang hc, lin kt, v cc thnh phn. Phn mmOptiSystem l mt sng to, pht trin nhanh chng, cng cthit khu hiucho php ngi dng lp khoch, kim tra, v m phng gn nh tt ccc

loi lin kt quang hc trong lp truyn dn ca mt quang phrng ca ccmng quang hc tmng LAN, SAN, MAN ti mng ultra-long-haul. N cungcp lp truyn dn, thit kv quy hoch hthng thng tin quang tcc thnh

phn ti mc hthng. Hi nhp ca n vi cc sn phm Optiwave khc vcc cng cthit kca ngnh cng nghip in thng u phn mm thit ktng gp phn vo OptiSystem y nhanh tin sn phm ra thtrng vrt ngn thi gian hon vn.

3.1.1. Li ch- Cung cp ci nhn ton cu vo hiu nng hthng- nh gi snhy cm tham sgip vic thit kchi tit kthut- Trc quan trnh by cc ty chn thit kv dn khch hng tim nng- Cung cp truy cp n gin tp hp rng ri cc hthng c tnh d

liu- Cung cp cc tham stng qut v ti u ha- Tch hp vi hcc sn phm Optiwave

3.1.2. ng dng

To ra p ng nhu cu ca cc nh khoa hc nghin cu, ks vinthng quang hc, tch hp hthng, sinh vin v mt lot cc ngi dng khc,


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OptiSystem p ng cc nhu cu ca thtrng lng tnh sng pht trinmnh mnhng vn dsdng cng cthit khthng quang hc.OptiSystem cho php ngi dng lp khoch, kim tra, v m phng:- Thit kmng WDM / TDM hoc CATV

- Thit kmng vng SONET / SDH- Thit kbpht, knh, bkhuch i, v bthu thit kbn phn tn- nh gi BER v penalty ca hthng vi cc m hnh bthu khc nhau- Tnh ton BER v qu cng sut tuyn ca cc hthng c sng dng khuchi quang.- Thay i hthng tham sBER v tnh ton khnng lin kt Khi hthngquang hc trnn nhiu hn v phc tp hn, cc nh khoa hc v ks ngycng phi p dng cc phn mm k thut m phng tin tin, quan trng htrcho vic thit k. Ngun OptiSystem v linh hot to iu kin thun li hiuquv hiu qutrong vic thit kngun sng. "

3.2. c im v chc nng

3.2.1. Cu to th vin (Component Library)Th vin OptiSytem bao gm hng trm cc thnh phn cho php bn c

thnhp cc thng sc o tcc thit bthc s. N tch hp vi cc thnghim v thit bo lng tcc nh cung cp khc nhau. Ngi sdng cthkt hp cc thnh phn mi da trn hthng con v ngi sdng v nh

ngha l th vin, hoc sdng m phng cng vi mt cng cca bn thbachng hn nh MATLAB hoc SPICE.Cthbao gm:

Th vin ngun quang

Th vin cc bthu quang

Th vin si quang

Th vin cc bkhuch i (quang, in)

Th vin cc bMUX, DEMUX

Th vin cc blc (quang, in)

Th vin cc phn tFSO

Th vin cc phn ttruy nhp

Th vin cc phn tthng (quang, in)

Th vin cc phn txl tn hiu (quang, in)

Th vin cc phn tmng quang


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Th vin cc thit bo quang, o in

3.2.2. Tch hp vi cc cng cphn mm OptiwaveOptisystem cho php ngi dng sdng kt hp vi cc cng cphn

mm khc ca Optiwave nh OptiAmplifier, OptiBPM, OptiGrating,WDM_Phasar v OptiFiber thit kmc phn t.

Miu tc tn hiu pha trnOptiSystem xl cc nh dng tn hiu hn hp cho tn hiu quang v introng Hp phn Th vin. OptiSystem tnh ton cc tn hiu ang sdng thchhp cc thut ton c lin quan n cc yu cu m phng chnh xc v hiuqu.

Cht lng v thc hin cc thut tondon hiu sut hthng, OptiSystem tnh ton cc thng schng hnnh BER v Q-Factor bng cch sdng phn tch shoc bn phn tch kthut ca hthng gii hn bi biu tng nhiu v ting n.

Cc cng ctrc quan nng caoCc cng ctrc quan tin tin to ra phOSA ,xung tn hiu,biu mt,phn

cc trng thi,cc s hp thnh v nhiu hn na.Ngoi ra,bao gm cc cngcnghin cu WDM cc danh sch tn hiu ngun,hnh nh ting n v OSNRcho mi knh.Theo di, gim st dliuBn c thchn cc cng thnh phn lu dliu v gn mn hnh sau khi m

phng kt thc. iu ny cho php bn xl dliu sau khi m phng mkhng cn tnh ton li , Bn c thty nh km mt shin hnh ti mnhnh ti cng mt cng.

3.2.3. Cc cng chin th

Optisystem c y cc thit bo quang, o in. Cho php hin ththam s,dng, cht lng tn hiu ti mi im trn hthng.

Thit bo quang: Phn tch ph(Spectrum Analyzer)

Thit bo cng sut (Optical Power Meter)

Thit bo min thi gian quang (Optical Time Domain Visualizer)


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Thit bphn tch WDM (WDM Analyzer)

Thit bphn tch phn cc (Polarization Analyzer)

Thit bo phn cc (Polarization Meter)...

Thit bo in:

Oscilloscope

Thit bphn tch phRF (RF Spectrum Analyzer)

Thit bphn tch biu hnh mt (Eye Diagram Analyzer)

Thit bphn tch li bit (BER Analyzer)

Thit bo cng sut (Electrical Power Meter)

Thit bphn tch sng mang in (Electrical Carrier Analyzer)...

3.2.4. M phng phn cp vi cc hthng con (subsystem)vic m phng c thc hin mt cach linh hot v hiu qu,

Optisystem cung cp m hnh m phng ti cc mc khc nhau, bao gm mchthng, mc hthng con v mc phn t.

3.2.5. Thit knhiu lp(Multiple Layout)Trong mt file dn, Optisystem cho php to ra nhiu thit k, nh

ngi sdng c thto ra sa i cc thit kmt cch nhanh chng v hiuqu. Mi file dn thit kca Optisystem c thcha nhieuf phin bn thitk. Mi phin bn c tnh ton v thay i mt cch c lp nhng kt qu

tnh ton ca cc phin bn khc nhau c thc kt hp li, cho php so snhcc phin bn thit kmt cch ddng.

3.2.6. Trang bo co (report page)Trang bo co ca Optisystem cho php hin thtt choc mt phn cc

tham scng nh cc kt qutnh ton c ca thit kty theo yu cu cangi sdng. Cc bo co to ra c tchc di dng text, dng bng tinh,th2D v3D. Cng c thkt xut bo co di dng file HTML hoc didng cc file template c nh dng trc


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3.2.7 Qut tham sv ti u ha (parameter sweeps and optimizations)Qu trnh m phng c ththc hin lp li mt cch tng vi cc gi

trkhc nhau ca tham sa ra cc phng n khc nhau ca thit k.Ngi sdng cng c thsdng phn ti u ha ca Optisystem thay igi trca mt tham sno t c kt qutt nht, xu nht hoc mtgi mc tiu no ca thit k.

3.3 Mt sgiao din phn mmTh vin cc phn t( component library ) :

Ngi dng truy cp vo ly cc phn tthit k(Hnh 1)

Hnh 2.1: Th vin cc phn t

Th vin cc phn t:- Th vin ngun quang - ( optical sources library )- Th vin cc bthu quang - (receivers library)- Th vin si quang - (optical fiber library)- Th vin cc bkhuch i (quang, in) - (amplifier library)- Th vin cc bMUX, DEMUX- Th vin cc blc (quang, in) - (filter library)- Th vin cc phn tFSO - ( free space optics library)- Th vin cc phn ttruy nhp - ( access library)- Th vin cc phn tthng (quang, in) - (passiver library)- Th vin cc phn txl tn hiu (quang, in) -( signal processing library)

- Th vin cc phn tmng quang (network library)- Th vin cc thit bo quang, o in


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Ngoi ra cc phn tc nh ngha sn, Optisystem cn c- Cc phn tMeasured components. Vi cc phn tny, Optisystem cho phpnhp cc tham sc o tcc thit bthc ca cc nh cung cp khc nhau.- Cc phn tdo ngi sdng tnh ngha ( User-defined Components)

Giao din ngi sdng:- Project layout : phn m ngi sdng thit k

Hnh 2.2. Giao din ngi sdng

- Dockers : bao gm Project Browser : truy nhp n cc tham sv kt quca thit k(Hnh


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Hnh 2.3: Project Browser

Description : a ra cc thng tin m ttm tt vthit k

Hnh 2.4: Description


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Status bar : hin thnhng gi vvic sdng Optisystem

Hnh 2.5: Status bar

Menu bar : cha cc menu c sn trong Optisystem

Hnh 2.6: Menu bar

Tool bars : cc thanh cng cc sn trn ca s

Hnh 2.7: Tool bars


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PHN IV. M PHNG THIT KHTHNG THNG TIN QUANGGHP KNHTHEO BC SNG MT CAO

4.1 Yu cu thit k

Bi ton: Xy dng phng n thit khthng thng tin quang DWDM c sdng khuch i quang EDFA vi cc yu cu thit knh sau:

+ Tc bit: 10 Gbit/s

+ Cly truyn dn: 240 km

+ Slng knh bc sng: 32 knh

-Mt sgi khi thit k:

+Loi si: Si quang n mode chun (G.655)

+Ngun pht: - Loi ngun: Laser.

- Phng thc iu ch: iu chngoi

Bthu: Sdng PIN kt hp vi blc thng thp Bessel

Yu cu:

Sdng phn mm Optisystem xy dng m hnh m phng hthng thngtin quang DWDM theo phng n thit k.

Lu : cc tham ston cc (global parameters m phng) c thit lpnh sau:

+Tc bit: 10 Gbit/s

+ Chiu di chui: 128 bits

+Smu trong 1 bit: 64

a cc thit bo vo m hnh m phng. Cc thit bo trn tuyn ct ti cc vtr ph hp xc nh c cht lng v dng tn hiu ti ccim cn thit trn tuyn. Cc thit bo c bn:

+Thit bo cng sut quang


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+Thit bphn tch phquang

+Thit bo BER

Chy m phng

- Hin thkt qum phng bng cc thit bo t trn tuyn

- Thay i cc tham sca cc phn ttrn tuyn t c BER = 10-12

- Bo co kt quthc hnh

- M hnh m phng

- Cc tham sm phng chi tit

- Kt qum phng

+ Kt qum phng theo phng n thit kban u hthng ban u

+ Sthay i ca cc tham sthit kt c BER = 10-12

-Nhn xt, phn tch kt qum phng .

4.2.M phng theo phng n thit k

4.2.1.Tuyn pht quang: chn ca struyn 1550nm EDFA bng C

-Tuyn pht quang gm 32 knh quang c tch hp thng quang bghpknh quang MUX.

-Thit lp thng ston cc

+ Tc bt 10GBps

+ Chiu di chui: 128bits

+ Smu trong mt bt: 64

Smu =Chiu di chuiSmu trong mt trong mt bit=12864=8192


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Hnh 4.1: Thit lp tham ston cc

Hnh 4.2:Ngun pht

Bghp knh quang (ghp 32 knh)


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Hnh 4.3: Bghp knh MUX 321

Ton tuyn pht 32 knh quang

Hnh 4.4: Ton tuyn pht quang


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4.2.2 Tuyn truyn dn quang

Hnh 4.5:Tuyn truyn dn quang.

-Si quang sdng G.655 c cc tham s: ti ca struyn 1550nm th:

+ Suy hao si: 0.2dB

+ tn sc: 16.75 ps/nmkm

+ dc tn sc (0.092ps/nm^2/k): 0.075ps/nm^2/k.

Do khong cch ng truyn ln thun tin cho vic m phng chng tasdng bloop ng vai tr nh mt bnhn cc vng lp.Chn chiu di siG.655 l 60km, sblp l: 240km60km=4 b.


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Hnh 4.6. Blp

- Do si quang c suy hao tn sc nn trong tuyn truyn dn ssdng bbtn sc DCF. Thng sca bb tn sc:

Gissi G655 c chiu di l L1=50km.

+tn sc l : D1= 16.75 ps/nm.km.

+dc tn sc : 0.075ps/nm^4.km.

+Chiu di si b tn sc ( DCF) l L2=60km-50km=10km

=>Th b tn sc D2= -D1L1/L4.= -5016.75/10= -83 ps/nm.km.

=>dc tn sc : 0.375ps/nm^4.km.

Hnh 4.7. Thng ssi b tn sc DCF


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Khuch i quang EDFA: Do suy hao si quang nn cn sdng bkhuch i EDFA b suy hao si.

+ L1=50km th suy hao si l: 500.2=10dB li ca bkhuch iEDFA

l 10dB.

+ L2=10km th suy hao si l: 100.2=5dB li ca bkhuch iEDFA

l 5dB.

4.2.3 Tuyn thu ca hthng DWDM

Hnh 4.8. Tuyn thu DWDM

Thit bo BER


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Hnh 4.9. Thit bo BER

4.3.Kt qum phng theo yu cu

thit kTuyn DWDM theo yu cu

Hnh 4.10. Tuyn DWDM thit ktheo yu cu

Quang phtn hiu pht


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Hnh 4.11: Quang phtn hiu pht

Quang phtn hiu thu


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Hnh 4.12: Quang phtn hiu thu ca knh 1

Cng sut tn hiu pht

Hnh 4.13:Tng cng sut pht

Cng sut tn hiu thu

Hnh 4.14:Cng sut thu ca knh 1

Tlli bt BER- Mt quang


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Hnh 4.15:Hin thmt quang

Hnh 4.16: BER cuknh thnht 10


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PHN V: KT LUN

DWDM vi nhng u thvmt cng ngh trthnh mt phng tin

ti u vkthut cng nh kinh tmrng dung lng si quang mt cchnhanh chng v qun l hiu quhthng. DWDM p ng c hon toncc dch vbng rng trn mng v l tin xy dng mng ton quangtrong tng lai. Cc c chbo vv khi phc dliu trn hthng DWDMchyu da trn nn tng WDM. Nhng trong thc tkhng phi thit btrnhthng DWDM cng ging hon ton vi thit btrn hthng WDM, do vyta phi ch trong qu trnh xy dng cc c chbo vv khi phc dliutrn hthng WDM.

Khi p dng cc c chbo vv khi phc dliu cho tuyn quang trcda trn nn tng hthng DWDM ta phi ch n c im ca tuyn quangtrc truyn vi cly rt xa v khnng xy ra cc scnh sct cp vhng hon ton mt nt no , cho nn khi xy dng cc c chbo vv khi

phc tn hiu trn tuyn phi ch ti hiu qukinh tv khnng phc hi bt ctrng hp scno v chi ph u t l rt ln v tin cy ca hthng. Hy vng trong tng lai gn chng ta c thxy dng cc c chbo vv khi phc dliu c tin cy cao ng thi chi ph u t thit bmc

hp l.

Sau khi thc hin xong ti chng em tip thu c kinh nghim lmvic theo nhm, cng vi nhng kin thc v cng bch vhthng thng tinquang cng nh cch thc m phng hthng bng phn mm optisystem. Tuy rt cgng nhng do kin thc hiu bit cn hn hp nn cn nhiu vn cha c gii quyt v cn mt sli nh. Chng em rt mong nhn c strgip ca cc thy gip mnh hon thin kin thc hn na. Mt ln na

chng em xin chn thnh cm n sgip nhit tnh ca thy.

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